Home

1747-6.22, Backup Scanner User Manual

1. MOVE 12 Source M1 1 103 Dest 7 21 0 4 BTR PENDING B3 4 U 4 0 VIRTUAL BTR ENABLE BIT N7 50 U 4 15 CHECK BTR STATUS B3 4 L 4 2 Rung 2 7 When a BTW successfully or unsuccessfully completes unlatch the BTW enable bit and the BTW pending bit to complete a BTW sequence Also latch the bit that continues checking the BTW status until the BSN module turns the done error bit off VIRTUAL BTW DONE BTW BIT PENDING N7 64 B3 4 4 222222222222222222 2222222 222222 4 U 13 1 VIRTUAL VIRTUAL BTW ERROR BTW ENABLE BIT BIT N7 64 N7 53 4 U 4 12 15 CHECK BTW STATUS B3 3 BTW ERROR CODE 4MOV MOVE Source M1 1 203 Dest N7 22 0 Publication 1747 6 22 7 148 RIO Block Transfer Rung 2 8 This rung and the newt rung toggles between executing a BTR and a BTW while the user supplied BT precondition bit B3 0 11 is used in this example is true BT VIRTUAL VIRTUAL VIRTUAL VIRTUAL PRECON BTR ENABLE BTW ENABLE BTR DONE BTR ERROR BTR DITION BIT BIT BIT PENDING B3 N7 50 NESS N7 60 N7 60 B3 Sees Ass
2. Important If you are using an SLC 5 02 processor M file data cannot be directly monitored To monitor M files you must move the M file words into an SLC file that can be monitored e g an integer N file SLC 5 03 or later processors allow you to monitor M files directly However do not address M file bits more than necessary throughout your application program The processor accesses M files like immediate I O Therefore excessive addressing of M files can greatly increase SLC processor scan time For more information on M files refer to Appendix B Publication 1747 6 22 Output R Control Logical Rack 0 Device Inhibit Word 8 Logical Rack 1Device Inhibit Word 9 Logical Rack 2 Device Inhibit Word 10 Logical Rack 3 Device Inhibit Word 11 Logical Rack 0 Device Inhibit Word 16 Logical Rack 1 Device Inhibit Word 17 Logical Rack 2 Device Inhibit Word 18 Logical Rack 3 Device Inhibit Word 19 Scanner Configuration and Programming 5 71 Control File Description You can control the operation of individual devices on the RIO link with MO word 8 through MO word 27 8 through 0 27 Through your application program you can use the MO file to Device Inhibit command the 1747 BSN module to stop scanning an RIO device by using words 8 11 Device Reset command an RIO device s outputs to reset while the SLC processor is in Run or
3. Bit Number octal z 16 5 14 13 12 itj 102 7 6 5 49 d 2 0 Example Scanner I O Image The illustrations below show a scanner s input image of 4 RIO link devices SLC 5 02 or Later Processor RIO L Le Dee Full Logical Rack Three Quarter Logical Rack Half Logical Rack Quarter Logical Rack Device Device Device Device Begins at Logical Rack Begins at Logical Rack 1 Begins at Logical Rack Begins at Logical Rack 2 0 Group 0 Group 0 2 Group 0 Group 4 Publication 1747 6 22 1 24 RIO Logical Rack 0 RIO Logical Rack 1 RIO Logical Rack 2 RIO Logical Rack 3 Overview Important The illustration below shows only the scanner s input image The output image looks the same Input File Bit Number 5 14 173 12 10 9 8 7 6 5 4 3 2 1 Address Rack 0 Group 0 I e 0 Rack 0 Group 1 Word 1 Ite Rack 0 Group 2Word 2 I e 2 Device 1 Rack 0 Group 3 Word 3 I e 3 Rack 0 Group 4Word 4 I e 4 Rack 0 Group 5 Word 5 ke5 Rack 0 Group 6Word 6 I e 6 Rack 0 Group 7 Word 7 e 7 Device 2 Rack 1 Group 0Word 8 e 8 Rack 1 Group 1 Word 9 9 Rack 1 Group 2Word 10 10 Rack 1 Group 3 Word 11 Ee 9006886 Rack 1 Group 4Word 12 I e 12 Rack 1 Group 5 Word 13 Le 13 Device3 Rack
4. Copy the System Status Word SSW and the Module Status Word MSW from the BSN module to internal storage words in the SLC processor every program scan Bits 6 and 7 of the SSW word indicate whether this processor is Primary or Secondary at any given time Bits 6 and 14 of the MSW word indicate whether the local or remote system is in the Primary or secondary Mode respectively Virtual SSW and MSW words bits are used to minimize M file transfers thereby minimizes their effects on the program scan time COP 0000 Copy File Source M1 1 3400 Dest 3 1 Length 2 This rung executes subroutine number 3 when the Local System is in the Secondary Mode Subroutine 3 contains the logic which must be executed to properly transfer HSSL data from the Secondary BSN Module to the Secondary SLC Processor Virtual SSW Bit when 1 indicates Virtual MSW Bit Virtual MSW Bit the local system is when 1 indicates when 1 indicates in the Secondary the Local System is the Remote System is Mode in the Primary Mode in the Primary Mode B3 1 B3 2 B3 2 JSR 0001 J E Mt J E Jump To Subroutine 7 6 14 SBR File Number U3 This rung executes subroutine number 4 when the Local System is in the Primary Mode Subroutine 4 contains the logic which must be executed to properly transfer HSSL data from the Primary SLC Processor to the Primary BSN Module Virtual SSW Bit Virtual MSW Bit Virtual MSW Bit when 1 the Local when 1 indica
5. A 0 indicates that the device is inhibited not responding to communications or configured to an incorrect logical rack size Publication 1747 6 22 A 1 indicates that the configured device is active Word 5 provides active device status for complementary devices When a RIO device is communicating with the scanner the bit corresponding to the device s logical starting group is set to 1 Devices that are inhibited in the MO file are represented by a 0 Unless devices are inhibited not responding to communications or configured to an incorrect logical rack size this word is identical to the device configuration M1 e 3 Important When a primary device is inhibited its complementary device is also inhibited A complementary device cannot be exclusively inhibited Scanner Configuration and Programming 5 81 M1 Status File Word 5 Bit Number decimal 15 14 13 12 10 9 8 7 6 5 4 3 2 1 0 RIO Rack 11 RIO Rack 10 RIO Rack 9 RIO Rack 8 Starting Group Starting Group Starting Group Starting Group M1 File 6 4 2 0 6 4 2 06 4 2 0 6 4 2 0 Primary Logical Device Address Word 3 oo mo foo mofo fo mt mo opt Mes Primary Logical Image Size Word 4 wa oeo REUS RC y jJ 1 Mt e4 Primary Active Device Status Word 5 ololo ojoj olt o lo o o t 1 R 0 1 Mt e5 0 indicates that the device is inhibited B c
6. e slot number of the SLC rack containing the scanner x not used defined e RIO Logical Rack 3 Logical Rack 2 RIO Logical Rack1 Logical Rack 0 Starting Group Starting Group Starting Group Starting Group 6 4 2 016 4 2 0 6 4 2 0 0 0 0 1 1 0 0 1 1 1 1 1 1 0 0 1 6 4 2 0 0 0 1 0 1 1 1 0 0 0 1 0 0 1 1 0 Publication 1747 6 22 5 84 Scanner Configuration and Programming M1 Status File Complementary Bit Number decimal 15 14 13 12 10 9 8 7 6 5 4 3 2 1 MFile Status Word Word 0 x x x x x x x x x x x x x x 1 1 Mt e 0 Baud Rate Word 2 x x x x x x x x x x X x x x 0 1 Mt e2 RIO Logical RIO Logical RIO Logical RIO Logical Rack 1 Rack 1 Rack 9 Rack 8 M1 e 3 Primary Device Address Word 3 Mt e4 Primary Device Size Word 4 A pode eed 06d prede Sep Ep eoe edes on 0d A Primary Active Device Status Word 5 0 0 0 0 0 0 1 0 0 0 0 1 1 0 0 4 Mi e 5 M1 e 12 olo of o Logical Rack 0 Device Fault Status Word 12 AEA AEA 01051015 Mt e 13 Logical Rack 1 Device Fault Status Word 13 RN MS Logical Rack 2 Device Fault Status Word 14 x Mtet4 Logical Rack 3 Device Fault Status Word 15 XE 1 0 Mi e15 G
7. Publication 1747 6 22 RIO Block Transfer 7 139 Bidirectional Continuous Block Transfer Example The following rungs demonstrate a bidirectional continuous block transfer The BTR and BTW each execute as fast as possible continuously and independently of one another Rung 2 0 Configure the BT operation type length and RIO address R G S in decimal at power up Bit N7 50 7 must be set to a 1 to indicate a btr and bit N7 53 7 must be a local 0 to indicate a BTW operation POWER UP BTR BIT CONTROL Sid TCOP ss FILE 15 Source N7 50 Dest 0 1 100 Length desees BTW CONTROL 4COP COPY FILE Source N7 53 Dest M0 1 200 Length 3 Se Rung 2 1 Copy the BTR status area to an integer file only when a BTR is in progress This status information is then used throughout the program and limits the number of M file accesses BTR PENDING BTR STATUS B3 COP 4 4 COPY FILE 0 Source M1 1 100 Dest N7 60 Length CHECK BTR STATUS B3 4 2 Rung 2 2 Unlatch the bit that continues to check the BTR status When BTR is complete the done or error bit is set The ladder program must then unlatch the e
8. TeseefLljpeee Te Lil 15 15 13 12 0 VIRTUAL BTR ENABLE BIT N7 50 1 15 Rung 2 9 BT VIRTUAL VIRTUAL VIRTUAL VIRTUAL PRECON BTR ENABLE BTW ENABLE BTW DONE BTW ERROR DITION BIT BIT BIT BIT BIT BIW DATA B3 N7 50 N7 53 N7 64 N7 64 COP See ol 17 lf pm COPY FILE 11 15 1 5 13 12 Source 7 10 Dest 0 1 210 Length 11 VIRTUAL BTW ENABLE BIT N7 53 T L 4 15 BTW PENDING B3 T L 4 1 Publication 1747 6 22 Rung 2 10 RIO Block Transfer 7 149 Move the virtual BTR control word to the MO file for the BSN module while a BTR is in progress and continue doing so until the enable done and error bits are all turned off VIRTUAL BTR ENABLE VIRTUAL VIRTUAL BTR ERROR BIT N7 60 qoeem Rung 2 11 BTR CONTROL BITS XMOV A MOVE t Source N7 50 0 Dest 0 1 100 Move the virual BTW control word to the MO file for te BSN module while a BTW is in progress and continue doing so until the enable done and error bits are all turned off VIRTUAL BTW ENABLE VIRTUAL BTW DONE VIRTUAL BTW ERROR BIT N7 64 peses ae BIW CONTROL BITS Source Dest TEN N7 53 0 0
9. 7 i 0 0 1 o M0 e 27 e slot number of the SLC rack containing the scanner X not used defined Scanner Configuration and Programming 5 75 Device Reset and Remote Output Reset Considerations From this mode The 1747 BSN Scanner Device Reset words M0 e 16 to MO e 19 and the Remote Output Reset words 0 24 to M0 e 27 operate in conjunction with each RIO device to determine the state of that RIO device s outputs The output control information that the scanner sends to the RIO device depends on how you configure these bits The RIO device acts on the output control information in accordance with its functionality and configuration To fully understand how a specific device responds to the Device Reset and Remote Output Reset words you must determine the operation of the RIO device To determine RIO device output operation refer to that device s user manual ATTENTION When using the Device Reset and Remote Output Reset words you must completely understand and fully test all device output operations before beginning normal system operation To properly use the Device Reset and Remote Output Reset words you must consider the output control information sent to the devices during two SLC processor operating conditions The SLC processor is in any given mode Run Program Test or Fault The SLC processor is leaving any mode and entering another If you do n
10. 83 1615 13 12 80 VIRTUAL BTR ENABLE BIT B3 L 1615 Rung 2 7 Move the virtual control word to the MO file for the SN module while a BTR is in progress and continue doing so until the enable done and error bits are all turned off completing the hand shake process VIRTUAL BTR BTR ENABLE CONTROL BIT WORD 1615 Source B3 100 0000000000000000 Dest M0 1 100 VIRTUAL BTR DONE BIT VIRTUAL BT ERROR BIT Publication 1747 6 22 RIO Block Transfer 7 133 Directional Repeating Block Transfer Example The following example shows a directional repeating block transfer This means that block transfer reads are sent repeatedly as fast as possible Use the same method for a BTW Rung 2 0 Configure the BTR operation type length and RIO address at power up Bit B3 100 7 must be set prior to going to run to indicate a BTR operation POWER UP BTR BIT CONTROL S l COP COPY FILE 15 Source B3 100 Dest 0 1 100 Length 4 t Rung 2 1 Copy the BTR status area to a binary file which is used throughout the program This avoids addressing the M1 file multiple times during each program scan Each time an instruction containing an M file bit word or file is scanned by the processor an immediate data transfer to the module occu
11. Access Time per Bit Instruction Type Der Word Multi Word Instruction SLC 5 02 Series All types 1930 us 1580 us plus 670 us per word SLC 5 02 Series All types 1160 us 950 us plus 400 us per word SLC 5 03 All Series XIC or 782 us OTU OTE or OTL 925 us COP to M file 772 us plus 23 us per word COP from M file 760 us plus 22 us per word FLL 753 us plus 30 us per word MVM to M file 894 us any source or Destination M file address 730 us SLC 5 04 OS400 XIC or XIO 743 us OTU OTE or OTL 879 us COP to M file 735 us plus 23 us per word COP from M file gt 722 us plus 22 us per word FLL 716 us plus 30 us per word MVM to M file 850 us any source or Destination M _ file address 694 us 1 Except the OSR instruction and the instruction parameters noted on page C 2 SLC 5 02 Processor Example If you are using a SLC 5 02 Series B processor add 1930 us to the program scan time for each bit instruction addressed to an or 1 data file If you are using a SLC 5 03 Series C processor add 1160 us Publication 1747 6 22 202 1 Files G Files Publication 1747 6 22 COP COPY FILE Source B3 0 Dest M0 1 0 Length 34 If you are using a SLC 5 02 Series B processor add 1580 us plus 670 us per word of data addressed to the MO or M1 file As shown above 34 w
12. 1 1 BTW 1 CONTROL DOOB COPY FILE p Source N7 53 Dest MO 1 200 Length 3 SSS SS SS SSS SSS SS SS Publication 1747 6 22 RIO Block Transfer 7 145 Rung 2 1 Copy the BTR status area to an integer file only when a BTR is in progress This status data will then be used throughout the program and limit sthe number of M file accesses BTR PENDING BTR STATUS B3 TCOP a COPY FILE 0 Source 1 1 100 Dest N7 60 Length 4 CHECK BTR STATUS B3 2 Rung 2 2 Unlatch the bit that continues to check the BTR status When a BTR is complete the done or error bit is set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done error bit before another BTR to the same M file location can be initiated This is one complete BTR cycle VIRTUAL BTR DONE CHECK BTR VIRTUAL BTR ERROR BIT N7 60 d Rung 2 3 Copy the BTW status area to an integer file only when a BTW is in progress This status data will then be used throughout the program and limits the number of M file accesses BTW BTW PENDING STATUS B3 COP COPY FILE 1 Source 1 1 200 Dest N7 64 Length 4
13. BTW ERROR n VIRTUAL Publication 1747 6 22 7 152 RIO Block Transfer Rung 2 5 When a BTR successfully completes buffer the BTR data and unlatch both the BTR virtual enable bit and the BTR pending bit Also latch the bit that continues checking the BTR status until the BSN module turns off the donebit VIRTUAL BTR DONE BIT BTR DATA N7 60 COP COPY FILE 13 Source 1 1 110 Dest N7 0 Length 10 PENDING B3 VIRTUAL BTR ENABLE CHECK BTR Rung 2 6 When a BTR unsuccessfully completes buffer the error code and unlatch the BTR enable bit and the BTR pending bit Also latch the check BTR status bit in order to continue reading the status information from the scanner until it turns the error bit off completing the handshake process BTR ERROR BIT N7 60 MOV E MOVE 12 Source M1 1 103 BTR PENDING B3 VIRTUAL BTR ENABLE STATUS Publication 1747 6 22 RIO Block Transfer 7 153 Rung 2 7 When a BTW successfully or unsuccessfully completes unlatch the BTW enable bit and the BTW pending bit tc complete a BTW sequence Also latch the bit that continues checking the BTW status until the BSN module tui the done error bit off In addition buffer the BTW error code
14. 1 0 17 Group 2 I e 18 Group 2 0 e 18 Logical Group 3 1 19 Logical Group 3 O e 19 Rack 2 Group 4 1 20 2 Group 4 20 5 I e 21 Group 5 0 e 21 Group 6 I e 22 Group 6 O e 22 Group 7 23 Group 7 23 Group 24 24 Group 24 O e 24 Group 25 I e 25 Group 25 25 Group 26 26 Group 26 26 27 I e 27 Group 27 0 27 Logical Group 28 l e 28 Logical Group 28 0 28 Rack 3 Group 29 1 29 Group 29 29 Group 30 I e 30 Group 30 0 e 30 Group 31 I e 31 Group 31 0 e 31 Publication 1747 6 22 Glossary The following terms are used throughout this manual Refer to the Allen Bradley Industrial Automation Glossary Publication Number AG 7 1 for a complete guide to Allen Bradley technical terms Adapter Any physical device that is a slave on the RIO link Adapter Image That portion of the scanner image assigned to an individual adapter ASB Module The Catalog Number 1747 ASB 1771 ASB or 1794 ASB Remote I O Adapter Module The ASB module is an adapter ASB Module Chassis The chassis directly controlled by the ASB module This includes the remote chassis and if installed two remote expansion chassis when using the 1747 ASB Block Transfer BT See RIO Block Transfer Block Transfer Read BTR A form of block transfer that occurs when a remote device transfers data to the SLC processor Block Transfer Wr
15. Allen Bradley Backup Scanner 1747 BSN User Manual Automation Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines for the Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or part without written permission of Allen Bradley Company Inc is prohibited Throughout this manual we use notes to make you aware of safe
16. 12 1 5 3442 13 1 5 3443 14 1 5 3444 15 1 5 3445 Block 16 Publication 1747 6 22 RIO Block Transfer Theory of Operation Chapter 7 RIO Block Transfer This chapter contains the following information RIO block transfer theory of operation RIO block transfer general functional overview scanner s block transfer buffer layout detailed operation of RIO block transfer RIO block transfer application considerations Steps for setting up a block transfer quick reference for using status and control bits block transfer control logic examples This section provides a conceptual overview of block transfer as it pertains to SLCs RIO scanners and remote devices For specific functionality details refer to the RIO Block Transfer General Functional Overview section on page 7 5 What Is RIO Block Transfer RIO Block Transfer is a data transfer mechanism that allows you to control the transfer of up to 64 words of data to or from a remote device over the Allen Bradley RIO link A Block Transfer Read BTR is used when a remote device transfers data to the SLC A Block Transfer Write BTW is used when an SLC processor writes data to a remote device The diagrams on the following pages illustrate the concepts of how block transfers occur using an SLC processor an RIO scanner and a remote device The first diagram illustrates the path a block transfer follows T
17. CHECK BTW STATUS B3 huc 3 Publication 1747 6 22 7 146 RIO Block Transfer Rung 2 4 Unlatch the bit that continues to check the BTW status When a BTW is complete the done or error bit is set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done error bit before another BTW to the same M file location can be ititiated This completes one BTW cycle VIRTUAL BTW DONE CHECK BTW BIT STATUS VIRTUAL BTW ERROR Rung 2 5 When a BTR successfully completes buffer the BTR data and unlatch both the BTR virtual enable bit and the BTR pending bit Also latch the bit that continues checking the BTR status until the SN module turns off the done bit VIRTUAL BTR DONE BIT N7 60 13 BTR DATA FILE Source 1 1 110 Dest N7 0 Length 10 BTR PENDING B3 VIRTUAL BTR ENABLE BIT N7 50 CHECK BTR STATUS B3 Publication 1747 6 22 RIO Block Transfer 7 147 Rung 2 6 When a BTR unsuccessfully completes buffer the BTR error code and unlatch the BTR enable bit and the BTR pending bit Also latch the check BTR status bit in order to continue reading the status information from the scanner until it turns the error bit off completing the hand shake process VIRTUAL BTR ERROR BTR ERROR BIT CODE N7 60 MOV
18. 7 6 Scanner s Block Transfer Buffer Layout 7 8 File Block Transfer Output Control Buffers 7 8 MO File BT Control Buffer Layout 7 9 BT Control Flag Definitions 7 9 M1 File Block Transfer Input Status Buffers 7 9 M1 File Input Status BT Buffer Layout Mte 100 1 3200 7 10 M1 File BTR BTW Error Codes M1 e 103 3203 caet oat ed sarees es 7 10 M1 File BTR BTW Status Flag Definitions M1 e 100 1 3200 7 11 Detailed Operation of RIO Block Transfer 7 12 Block Transfer Timing 7 14 Successful Block Transfer 7 14 Successful Block Transfer Read Write 7 14 Block Transfer Failure at Startup 7 15 Block Transfer Failure at Startup 7 15 Block Transfer Failure After Startup of Transmission Across RIO Link 7 16 Block Transfer Failure after Startup of Transmission Across the RIO Link 7 16 SLC Control Program Cancelling a Block Transfer Once Transmitted Across RIO Link 7 17 SLC Control Program Canceling a BT Once Transmitted Across RIO Link 7 17 SLC Control Program Cancelling a Block Transfer Prior To Transmission Across RIO Link 7 18 SLC Control Program Canceling a BT Prior to Transmission Across RIO Link 7 18 Setting Up A Blo
19. ati eos od ceca e vd ode fs eee B 8 Configuring G B 9 Editing G File Data B 10 Table of Contents xi Appendix C RIO Configuration C 1 DIFSCHOUS 0461 24 Vas d exa ot du e oco ath gm C 1 Glossary Index Publication 1747 6 22 xii Table of Contents Publication 1747 6 22 Preface Read this preface to familiarize yourself with the rest of the manual This preface covers the following topics who should use this manual how to use this manual related publications conventions used in this manual Allen Bradley support Who Should Use This Use this manual if you are responsible for designing installing Manual programming or troubleshooting control systems that use Allen Bradley small logic controllers How to Use This As much as possible we organized this manual to explain in a task p 8 p Manual by task manner how to install configure program operate and troubleshoot a control system using the 1747 BSN Backup Scanner Manual Contents If you want See An overview of the system including backup scanner SLC interaction compatible devices and features Chapter 1 quick start guide for experienced users Chapter 2 Installation and wiring guidelines Chapter 3 Operating your SLC 500 backup system Chapter 4 Backup scanner configuration information I O file information and G
20. 13 Source 1 1 110 Dest N7 0 Length 10 PENDING B3 VIRTUAL BTR ENABLE BIT N7 50 U CHECK BTR STATUS B3 L Rung 2 6 When a BTR unduccessfully completes buffer the error code and unlatch the BTR enable bit and the BTR pending bit Also latch the check BTR status bit in order to continue reading the status information from the scanner until it turns off the error bit completing the handshake process VIRTUAL BTR ERROR BTR ERROR BIT CODE N7 60 MOV MOVE 12 Source M1 1 103 BTR PENDING B3 VIRTUAL BTR ENABLE CHECK BTR STATUS B3 Publication 1747 6 22 7 142 RIO Block Transfer Rung 2 7 When a BTW successfully completes unlatch the BTW enable bit and the BTW pending bit to complete a BTW sequence Also latch the bit that continues checking the BTW status until the SN module turns the done bit off VIRTUAL BTW DONE Rung 2 8 BTW PENDING B3 U 1 VIRTUAL BTW ENABLE CHECK BTW STATUS B3 When a BTW unsuccessfully completes buffer the error code and unlatch the BTW enable bit and the BTW pending bit Also latch the check BTW status bit in order to continue reading the status information from the scanner until it turns off the error bit completing the handsha
21. B3 6 B3 7 TE CU zi Ww 14 14 This rung monitors the DTCW and DTSW bits for Data Block 16 When a transfer of data using Data Block 16 is not in progress copy up to 128 words to the appropriate M file location for Data Block 16 in the BSN module B3 5 B3 6 COP Mt 26 Copy File 15 15 Source N20 128 Dest 0 1 5420 Length 128 B3 7 CL 15 Unlatch the virtual DTCW bit for Data Block 16 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 16 when B3 7 15 has been unlatched the BSN module is ready for the next data transfer via Data Block 16 B3 6 B3 7 EQ ik QU 15 15 This rung copies the Virtual DTCW word B3 7 to the actual DTCW word 0 1 3410 located in the 1747 BSN module M file accesses are interrupts to the processor and using virtual words minimizes M file accesses and therefore minimizes the effects of these transfers on the ladder program scan time Virtual amp Actual DTCW Word MOV Move Source B3 7 0000000000000000 Dest M0 1 3410 lt CEND Publication 1747 6 22 Data Transfer Schemes Programming Techniques 9 177 This manual provides two possible methods for transferring data from a primary to a secondary processor The first programming alternative transfers a data block per program scan With this method the application program defines the order that is u
22. Qroub5 Word 5 Group 6 Weel Mod Mod Mod TOU or Group 0 Word 8 1 0 nog mw Group 1 Word 9 Group 7 Word 23 WM Group 0 Word 24 Group 1 Word 25 Group 2 Word 26 These are discrete modules Image Logical Group 3 Word 27 Rack3 QGroup4 Word28 awe 1 2 1 Modules handshake bytes map to Module 215 an8 point output Group Word 2 4 3 3 these I O image addresses module and module 4 is an8 Group 7 Word 31 point input module NER Logical Slot 0 tow Save ond Logical Slot 1 Publication 1747 6 22 7 110 RIO Block Transfer Scanner s Block This section describes the scanner s MO output control and Transfer Buffer Layout M1 input status block transfer buffers MO File Block Transfer Output Control Buffers There are 32 BT output control buffers allocated in the MO file These buffers contain BTR BTW control information and BTW output data The following explains the layout of BT buffer 1 Important The general layout below of buffer 1 is the same for all 32 MO BT buffers The e in the examples refers to the physical chassis slot number in which the scanner resides Remember that buffers start on 100 word boundaries M0 e 100 Contains BTR BTW control flags that control block transfers Control flags are explained on the following page 0 101 Used to configure BTR BTW length information 0 to
23. User selectable modules in the secondary system helping determine if switchover has occurred 5 Reserved T Last module ON 6 Identifies the last module in the local status link All others OFF Publication 1747 6 22 3 46 Installation and Wiring Publication 1747 6 22 Baud Rate Settings Position 1 Position 2 Baud Rate ON ON 57 6K ON OFF 115 2K OFF ON 230 4K OFF OFF Disabled Module Address Switch The four position Module Address DIP switch configures the BSN address in the LSL The table below shows the address that corresponds to each setting Switch Position 1747 BSN Address 1 2 3 OFF OFF OFF 1 ON OFF OFF 2 OFF ON OFF 3 ON ON OFF 4 OFF OFF ON 5 ON OFF ON 6 OFF ON ON 7 ON ON ON 8 Note Switch position 4 is not used The figure below shows the location of the DIP switches on the Backup Scanner Important For proper RIO link system operation all devices must be configured for the same baud rate Configuration Switch Module Address Switch A ZO L ND mm ACO NC AL zo 123456 Installation and Wiring 3 47 Backup Scanner Installation Installation procedures for this module are the same as for any other discrete I O or specialty module Refer to the illustration below to identify chassis and module components listed in the
24. Slot The physical location in any SLC chassis used to insert I O modules Specialty I O Module An I O module other than a discrete I O module e g an analog module System Status Word SSW This word is M1 s 3400 where s slot number of BSN and is used to monitor the status of the entire backup system Numerics 1 2 slot addressing 1 13 5 28 1 slot addressing 1 12 5 28 2 slot addressing 1 11 5 28 7 7 Access point address 4 4 Active device status 5 22 Adapter G 1 Adapter image 1 3 G 1 Advanced Setup menu 2 3 Agency certification 1 ASB module G 1 ASB module chassis G 1 Asynchronized data transfer 4 6 Automatic transfer 4 1 B Backplane communication 4 2 Backplane current consumption 1 Backplane power requirements 1 3 Baud rate 3 1 Baud rate selection A 1 Baud rate settings 1 18 3 2 Bit displacement instructions 9 18 Block transfer 1 8 1 16 4 2 5 11 7 1 G 1 block transfer throughput A 9 Block transfer buffer layout 7 3 Block transfer buffers 7 5 7 8 Block transfer failure 7 16 Block transfer instructions Index 9 19 Block transfer modules 1 14 Block transfer read 7 1 7 2 7 3 G 1 Block transfer write 7 1 7 2 7 4 G 1 C capturing M0 M1 file data B 7 Carrier detect circuit 8 7 Code ID number 5 29 Communications attempted status bit 5 20 Compare instructions 9 18 Compatible devices
25. gt Reserved The six position dip switch is used to configure the communication channel and other miscellaneous information The switches have the following definition SW 1 1 and SW 1 2 Define the communication channel baud rate as showed in table 4 e SW 1 3 when ON means that the channel is configured as DH When OFF means that the channel is configured as RIO e SW 1 4 User identification SW This switch can be used by the customer to differentiate one BSN from its counterpart and help on identifying that a switchover occurred It is only a user switch the BSN module doesn t care about the state of this switch SW 1 5 reserved SW 1 6 Last Module in LSL The BSN module that the user intends to be the last in the Local Status Link must have this switch ON All the other BSN modules must have this switch OFF If a backup system have only one BSN in each processor chassis this switch must be ON in this module SW 1 1 SW 1 2 Baud Rate KBaud 1 1 57 6 1 0 115 2 0 1 230 4 0 0 Disabled Module Status Counters Module Control and Status Word 6 101 The four position dip switch is used to configure the BSN address in the Local Status Link The table below shows the meaning of bits 0 through 2 of SASW Switch SW 2 4 is not used Switch Assemblies Status Word Bits 1747 BSN Address SW 2 3 SW 2 2 SW 2 1 0 0 0 1 0 0 1 2 0 1 0 3 0 1 1 4 1 0 0 5 1 0 1 6 1 1 0 7 1 1 1
26. High Byte 87 Low Byte 0 0 O e 1 O e 2 0 e 3 O e 4 0 5 0 6 0 e 7 O e 8 O e 9 10 11 12 0 e 13 O e 14 0 e 15 O e 16 O e 17 0 e 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Publication 1747 6 22 210 SLC Processor Input Image SLC Processor Output Image High Byte Low Byte High Byte Low Byte Bit Number Decimal 15 87 0 Bit Number Decimal 15 87 Group 0 I e 0 Group 0 0 1 let Group 1 O e 1 Group 2 I e 2 Group 2 0 e 2 Logical Group 3 l e 3 Logical Group 3 0 e 3 Rack 0 Group 4 I e 4 Rack 0 Group 4 4 Group 5 I e 5 Group 5 5 Group 6 I e 6 Group 6 O e 6 Group 7 I e 7 Group 7 0 e 7 Group 0 I e 8 Group 0 O e 8 Group 1 I e 9 Group 1 O e 9 Group 2 I e 10 Group 2 10 Logical Group 3 I e 11 Logical Group 3 0 11 Rack 1 Group 4 I e 12 Rack 1 Group 4 O e 12 Group 5 13 Group 5 0 13 Group 6 14 6 0 e 14 Group 7 I e 15 Group 7 0 e 15 Group 0 1 16 Group 0 16 1 17
27. Logical rou lor SOUS Word 3 rou ori 5 Word5 Adapter Group6 Word 6 Mod Mod Mod Mod Group 7 Word 7 Group 0 Word 8 io 1 42 3 4 Group Word 9 7 Image Group 7 Word 23 Group 0 Word 24 ogical Group 1 Word 25 2 an Cb 3 Word 2 These all analog modules Group t wo 28 2 1 2 1 Modules handshake bytes to these I O that are assigned block Grou 6 Word 30 4 3 LINE image addresses transfer operations Group 7 Word 31 Logical Slot 0 TN SET Logical Slot 1 Example 3 In this example the remote adapter is using 2 slot addressing It is assigned 1 4 logical rack of the scanner s I O image files starting at RIO Logical Rack 3 Logical Group 4 The remote adapter controls two analog devices which are configured for block transfer operations and two discrete devices 8 point input and 8 point output Note that each analog module uses both the input and output byte of the logical slot to which it is assigned while the discrete modules use only the input or output byte 1747 SN RIO Scanner s I O Image Files Input Image Output Image These are all analog modules Group 0 Word 0 that are assigned block Group 1 Word 1 transfer operations Group 2 Word2 Logical Group3 Word 3 Group4 Word 4 Adapter
28. New primary processor takes the token The new primary processor has nothing in its active node table The DH link times out and must rebuild 250 ms watchdog timeout 50 ms x number of stations on the link New primary processor receives a message from another station The link continues working normally Important In the recommended configuration set both SLC 500 processors to the same station address The backup modules permit only one of the two processors to be connected to the DH at a time In this configuration remote PLC processors and operator stations communicate to the processor that currently has primary status Note that the secondary processor can also be accessed through the primary SLC 500 processor node address plus one n 1 Publication 1747 6 22 8 162 Switchover Considerations Remote Switching Publication 1747 6 22 The communications protocol for the remote I O link is a master slave half duplex type This means that the master station processor sends a command message addressed to a slave remote I O adapter and the slave responds with a reply message addressed to the master This is also called two way alternating communication When the communication channel is configured as RIO the primary 1747 BSN emulates a Series B 1747 SN module with all the features that it provides to the user Additionally the secondary 1747 BSN spies on the RIO link to acquire all the input d
29. R Receiver program 4 5 Remote chassis G 3 Remote expansion chassis G 3 Remote I O link 6 2 Remote I O switching 8 1 Remote output reset 5 13 Index I cexvii Remote output reset words 5 17 Remote programming 4 4 Reserve current capacity 3 3 Reset adapter decide G 3 Reset adapter reset G 3 Retentive memory B 8 RIO block transfer 7 1 G 3 RIO communication 6 5 RIO discrete transfer G 3 RIO link G 3 RIO link device G 3 RIO link wiring 3 5 RIO scan time throughput A 4 RIO DH Communication Channel 4 2 S Scanner G 3 scanner output delay time with block transfer A 6 without block trans fer A 11 Scanner asynchronous operation 1 5 Scanner image G 3 Secondary mode 6 4 6 5 Secondary module 1 1 Secondary system 1 22 6 3 6 5 6 6 Sequencing instructions 9 18 SLC chassis G 4 SLC processor G 4 Specialty I O Configuration menu 2 3 Specialty I O module G 4 Starting group address 5 14 Status file 5 10 Status flag definitions 7 11 Publication 1747 6 22 l ccxviii Index Publication 1747 6 22 Status LEDs 1 17 3 6 Storage temperature A 1 Switch assemblies status word 6 12 Switchover diagnostic 6 3 System status word 4 5 6 2 6 9 G 4 T Terminal wiring 3 4 terms G 1 throughput A 2 calculating throughput A 3 block transfer A 9 with block transfers present A 6 A 10 without block trans fers present A 3 introduction A 2 Timer b
30. file type 0 or 1 slot 1 30 word 0 to max supplied by module bit 0 15 Using MO M1 Data File Addresses and 1 data file addresses can be used in all instructions except the OSR instruction and the instruction parameters noted below Instruction Parameter uses file indicator BSL BSR File bit array SQO SQC SQL File sequencer file LFL LFU LIFO stack FFL FFU FIFO stack Publication 1747 6 22 1 Files and Files B 199 Monitoring Bit Addresses For SLC 5 02 processors the MO M1 Monitoring option is always disabled This processor does not allow you to monitor the actual state of each addressed MO M1 address For SLC 5 03 and SLC 5 04 processors you can choose to disable or enable the monitoring option by selecting 61 System Config from the main menu MO M1 Monitoring Option Disabled When you monitor a ladder program in the Run or Test mode with the MO M1 Monitoring option disabled the following bit instructions addressed to an MO or MI file are indicated as false regardless of their actual true false logical state e s Mf e s Mf e s 1 E C U b b b b b f file 0 or 1 When you are monitoring the ladder program in the Run or Test mod the HHT display does not show these instructions as being true when the processor evaluates them as true If you need to show the state of the MO or 1 addressed
31. nbt throughput substitute values for the variables in the formula above Locate these values in the following documents Variable Variable Description Location of Variable The total processor scan time Tps ms APS reference manual see the section RIO Scan Time Trio The total RIO scan time ms Calculation Trio on page B 4 The adapter throughput delay Tadp For a 1747 ASB this is two ASB adapter user manual backplane scan times the section Backup Scanner The backup scanner module yd TSNo output delay time ms eat Time on Tus The backup scanner module 5 ms constant value for all SN input delay time ms formulas in this appendix T The input module delay time product data and I O id ms instruction sheets T The output module delay time product data and I O od ms instruction sheets Publication 1747 6 22 188 Specifications Publication 1747 6 22 RIO Scan Time Calculation The RIO scan time is calculated by identifying the baud rate and image size of each logical device on the RIO link Locate the corresponding time value in the following table If you are using multiple logical devices add the time values together to determine the total RIO scan time adapter 1 Tadapter 2 T adapter 3 RIO Scan Times for Adapters Adapter Baud Rate Size 57 6K 115 2K 230 4K 6 0 ms 3 5 ms 2 5 ms 6 5 ms 4 0 ms 2 75 ms
32. Data Transfer 9 13 Data Transfer Method 1 9 13 Data Transfer Method 2 9 14 Other transfer 9 15 Accounting for Instructions That Could Cause Problems During Switchover 9 16 Timer Instructions 9 16 Counter Instructions 9 17 Programming 9 18 Diagnostic Sequencing File Arithmetic and Logic File Search and Compare File Copy and Fill Instructions cua eie ha te n a 9 18 FIFO and Bit Displacement Instructions 9 18 Block Transfer Instructions 9 19 Message Instructions 9 19 PID Control Files n todd aes 9 20 Summary of Programming Considerations 9 20 Publication 1747 6 22 X Table of Contents Specifications M0 M1 Files and G Files Publication 1747 6 22 Appendix A Backup Scanner Operating Specifications A 1 Network Specifications 1 Throughput Introduction A 2 RIO Network Throughput Components A 2 Calculating Throughput A 3 Discrete I O Throughput without Block Transfers Tdm nbt Present 3 RIO Scan Time Calculation TRIO 4 Example Disc
33. Off The communication channel is not configured as RIO Back up Module The module is not ready for ERR Error Flashing Red switchover Off The module is ready for switchover High Speed Serial The link is operating with no HSSL Link Communication Flashing Green errors Off A communications error has been detected on the HSSL A hardware fault has FLT Fault Steady Red occurred Flashing Red The module is not configured properly Publication 1747 6 22 Chapter Objectives How the 1747 BSN Module Operates Chapter 4 Operating Your SLC 500 Backup System In this chapter we describe how the primary system transfers data to the secondary system We do this by describing the operation of the 1747 BSN module SLC 500 backup system In addition we provide procedures for starting your system powering up your system disconnecting a faulted system restarting a repaired system changing the processor s operating mode editing a program on line In a SLC 500 backup system the 1747 BSN module performs three distinct functions automatic transfer of remote input data over the High Speed Serial Link HSSL transfer of data in the data table by data transfer using M files secondary processor remote programming capability Automatic Transfer of Remote Input Data Over the HSSL With automatic transfer the primary 1747 BSN module is continually updating a copy of the remote input image table i
34. PY 930 4K baud 762 m 2 500 ft Gray Red DIP Switch Position for Baud Rate Selection Position 1 Position 2 Baud Rate ON ON 57 6K ON OFF 115 2K OFF ON 230 4K OFF OFF Disabled Publication 1747 6 22 186 Specifications Throughput RIO throughput is defined as the time between when an input event Introduction occurs at an I O module in an RIO chassis to when an output event occurs at an I O module within the same RIO chassis There are three types of throughput concerning the 1747 BSN Backup Scanner Module and its RIO network discrete throughput time from discretely mapped input to discretely mapped output without block transfers BTs present discrete throughput time from discretely mapped input to discretely mapped output with BTs present BT throughput time from when a BT is enabled to when the BT successfully completes RIO Network Throughput Components The following components affect RIO network throughput the total SLC processor scan time the total RIO link scan time adapter s backplane scan time s the backup scanner s output delay time the backup scanner s input delay time input module delay times output module delay times Processor Scan Scanner Sca
35. Tadapter2 Tadapter3 Trio 165 5 1 4 0 2 3 5 16 5 ms 3 Specifications A 193 Calculate the maximum Tj time for each logical rack Do this by determining the largest BT that occurs to any device within a logical rack and calculating the transfer time using the table on page B 7 Then add together the T times for each logical rack to obtain Ty T for rack 0 0 150 8 3 5 4 7 ms maximum BT to rack 0 is 8 words T for rack 1 0 150 2 3 5 3 8 ms maximum BT to rack 1 15 2 words Tj for rack 2 0 150 64 3 5 13 1 ms maximum BT to rack 2 is 64 words Tri Tril Tri2 4 7 3 8 13 1 221 6 ms Substitute all the values for variables in the throughput formula and solve for throughput 2025 0 2 16 5 2 21 6 9 0 22 0 5 0 10 0 1 0 Tam bt 173 2 ms maximum throughput Block Transfer Throughput Block transfer throughput is the time from when the BT is enabled via the EN bit until the DN bit is processed The following BT timing explanations are based on the directional continuous BT example shown on page where a BT is re triggered automatically upon each completion BT throughput is always slower than discrete data transfer Completing a BT is dependent on the time involved for the pe A SLC control program to enable the BT via an MO file write backup scanner to detect that a BT has been requested BT to be waiting in the queue due to
36. device does not allow you to access the M files in the SLC control program If you are using the block transfer BT function you should set the and MO file sizes to 3 300 Refer to chapter 5 before completing this selection Set the G file size to 3 5 if using complementary I O using the Specialty I O Configuration menu Enter your setup information using the Modify G File menu Important SLC 5 02 processors scan chassis I O slots left to right starting at slot 1 regardless of the module type SLC 5 03 and later processors scan slots with discrete I O modules first left to right starting at slot 1 and then slots with specialty modules left to right starting at slot 1 1 The SLC 5 03 and SLC 5 04 processors cannot be programmed with the HHT Publication 1747 6 22 5 88 Scanner Configuration and Programming Publication 1747 6 22 Chapter 6 Module Control and Status Word The addresses M0 s 400 through 0 5 3499 and M1 s 3400 through M1 s 3499 are used for status and control exchange between the SLC 5 0 and the 1747 BSN This item contains the initial definition for these words The table below shows the address allocation for these words Control Word Description MO Address Start End Reserved 3400 3409 Data Transfer Control Word DTCW 3410 3410 Data Transfer Handshake Word DTHW 3411 3411 Reserved 3412 3499 Status Word Description 1 Address Start E
37. qeue L e When user logic initiates a new BTW copy the data to the MO file data area and latch the virtual BTW enable bit provided that a BTW is not in progress Also latch the BTW pending bit so the BT status file will be read by the ladder program USER LOGIC TO VIRTUAL VIRTUAL INITIATE A BTW ENABLE BTW DONE BTW BIT BIT 2 0 B3 100 B3 0 c DA eec 0 15 13 Publication 1747 6 22 VIRTUAL BTW ERROR BIT B3 0 12 BIW DATA FILE Source Dest Length N7 110 M0 1 110 64 E SERVICE THE BTW STATUS BTW PENDING B3 5 L VIRTUAL BTW ENABLE BIT RIO Block Transfer 7 129 Rung 2 6 Move the virtual control word to the MO file for the SN module whenever a transition of the BTW eneble bit occurs VIRTUAL BTW ENABLE BIT B3 100 4MOV MOVE t 15 Source B3 100 0000000000000000 Dest M0 1 100 VIRTUAL BTW DONE BIT B3 0 13 VIRTUAL BTW ERROR BIT B3 0 f 19 Rung 2 7 M MM M FENDT e ss Directional Continuous Block Transfer Example The following rungs demonstrate a directional continuous block transfer As long as the BTR precondition bit is true bloc
38. 0 Do not attempt to alter word 0 Important The term primary is used in conjunction with the term complementary when referring to a complementary I O configuration Primary refers to I O image space found in Logical Racks 0 through 3 when in complementary I O mode Normal refers to the same image space racks 0 3 when not in complementary I O mode Scanner Configuration and Programming 5 61 Word 1 Primary Normal Logical Device Address specifies the logical starting address of each primary normal RIO link device The logical address consists of the logical rack number 0 1 2 or 3 and starting logical group 0 2 4 or 6 Each bit in this word represents a logical address To specify an address place a 1 at the bit corresponding to the starting logical address of each logical device Word 2 Primary Normal Device Logical Image Size specifies the logical image size amount of scanner I O image of the devices set in word 1 As with word 1 these bits correspond to RIO logical rack and logical group numbers To specify image size place a 1 at each group device occupies Word 3 Complementary Logical Device Address specifies the logical starting address of each complementary RIO link device The logical address consists of the logical rack number 8 9 10 or 11 because a complementary device is always 8 above its primary and starting logical group 0 2 4 or 6 Each bit in this word represents a logical addre
39. 1 A gp i jos Ge 3 gt s 4 gt d oj E TE E A P 0 0 1 e T T T T ee be 5 me ues af 2 2 2 2 Outputs in the complementary chassis would use the same bits in the output image table as the outputs in the primary chassis You cannot place inputs in the complementary chassis Output modules use the same output image table bits This is not recommended 2 Must be empty if corresponding primary slot is a block transfer module Important With 2 slot addressing if an input module resides in either slot associated with a logical group of the primary chassis an input module cannot reside in that logical group s complementary chassis Publication 1747 6 22 1 28 Overview Complementary 1 0 Placing Modules with 1 Slot Addressing The figure below illustrates a possible module placement to configure complementary I O using 1 slot addressing vzm I Input Module 8 or 16 point Output Module 8 or 16 point BT Block Transfer Module z Output modules use the same output image table bits This is not recommended 2 Must be empty if corresponding primary slot is block transfer Publication 1747 6 22 O
40. 203 XIC instructions in rungs 1 and 2 are addressed to the MO data file Each of these instructions adds approximately 1 ms to the scan time SLC 5 02 Series B Processor In the equivalent rungs of the figure below XIC instruction M0 2 1 1 is used only in rung 1 reducing the SLC 5 02 scan time by approximately 1 ms These rungs provide equivalent operation to those of figure A by substituting XIC instruction B3 10 for XIC instruction 0 2 1 1 in rung 2 Scan time is reduced by approximately 1ms Series B processor The following figure illustrates another economizing technique The COP instruction addresses an 1 file adding approximately 4 29 ms to the scan time if you are using a SLC 5 02 Series B processor Scan time economy is realized by making this rung true only periodically as determined by clock bit S 4 8 Clock bits are discussed in appendix B of the SLC 500 and MicroLogix 1000 Instruction Set Reference Manual Publication 1747 6 15 A rung such as this might be used when you want to monitor the contents of the M1 file but monitoring need not be on a continuous basis S 4 Bll E OSR COPY FILE S M1 4 3 5 4 8 causes the M1 4 3 file 8 0 N10 0 to update the N10 0 file Length 6 every 2 56 seconds Publication 1747 6 22 204 1 Files G Files Publication 1747 6 22 Capturing MO M1 File Data The first two ladder diagrams in t
41. 29 0 29 Word 30 1 30 Word 31 1 31 Number octal 17g 166 158 143 138 1258 119 103 7 68 58 4g 3 28 1 Os Publication 1747 6 22 Scanner Configuration and Programming 5 67 Considerations When Configuring Remote Crossing Logical Rack The following sections contain information that you should understand before you configure your scanner s G file G File Considerations Youcan only change the RIO configuration by modifying the G file while offline in your program file Your application program cannot access the G file nor can you access it while online with your programming device However your SLC control program can dynamically inhibit and uninhibit RIO devices via the MO file RIO devices larger than 1 logical rack appear as multiple devices on the RIO link Refer to the Crossing Logical Rack Boundaries section below The address and size of the devices you list in the G file must match the settings of each RIO device You express remote I O image boundaries in an even number of Boundaries groups For example the 1747 ASB image can be any size from two logical groups up to 32 logical groups four logical racks in 2 logical group increments If the scanner image assigned to an adapter is greater than 8 logical groups one logical rack the image crosses logical rack boundaries If the s
42. 6 22 0017 0018 Programming Techniques 9 171 This rung copies the Virtual DTHW word B3 4 to the actual DTHW word M0 1 3411 located in 1747 BSN module M file accesses are interrupts to the processor and using virtual words minimizes M file accesses and therefore minimizes the effects of these transfers on the ladder program scan time Virtual amp Actual DTHW Words MOV Move Source B34 0000000000000000 Dest M0 1 3411 x NA Publication 1747 6 22 9 172 Programming Techniques Program File 4 0000 0001 0002 0003 0004 The following rungs are meant to be executed only when this processor BSN is in the Primary Mode When it is acting as the Primary Processor this rung copies DTCW and DTSW words to internal storage words within the SLC processor B3 5 and B3 6 respectively for this example Virtual amp Actual DTCW Words MOV Move Source 0 1 3410 x Dest B3 5 0000000000000000 lt Virtual amp Actual DTSW Words MOV Move Source M1 1 3410 Xx Dest B3 6 0000000000000000 lt This rung monitors the DTCW and DTSW bits for Data Block 1 When a transfer of data using Data Block 1 is not in progress copy uj to 128 words to the appropriate M file location for Data Block 1 in the BSN module Virtual DTCW Bit for Virtual DTSW Bit for Data Block 1 Data Block 1 B3 5 B3 6 COP Vt 3 Copy File 0 0
43. 64 Length is the number of BTR BTW words read from or written to the end device If length 0 then the RIO device informs the SLC processor as to how much data to transfer The BT buffers cannot overflow because they each reserve 64 words of data area M0 e 102 Contains the logical address of the BTR BTW operation in logical rack group and slot number format The logical rack group and slot are combined into one word which you enter in decimal form Input Image Output Image M0 e 102 Logical Address Example TREE Group 2 Word The Slot Number 0 or 1 in M0 e 102 Rack 0 Group 4 Word indicates the logical slot number within a logical pra group 0 designates the least significant image Grou 0 Wore byte and designates the most significant image Grup Word9 byte Group 7 Word 23 0 4 Grap d ds Which Slot Number To Use Logical Fu 2 Word 26 When your adapter is configured for 2 slot Hacka Group 4 Word 28 addressing 0 is the left slot and 1 is the right slot rou Group amp Word 30 For both 1 slot and 1 2 slot addressing the slot Group 7 Word 31 ber is al 0 amp number is always 0 pes 500 Example M0 e 102 Configurations Logical Rack 0 Group 0 Slot 0 O Logical E sound _ Logical Slot 1 High Byte Rack 0 Group 0 Slot 1 1 Logical Rack 2 Group 3 Slot 1 231 Logical Rack 0 G
44. B 0 1 1 NE 1 LUE M1 e 4 o of o ofofofixfofofo lott fio Mes M1 File x x x X x x x 0 0 0 0 x x x Mt e 12 x x x x x x x 0 0 0 0 x x x x 1 13 x x x x x x x x 0 0 0 0 x x x x Mt e 14 x x x x x x x x 1 1 1 0 x x x x Mt e 15 Publication 1747 6 22 e slot number of the SLC rack containing the scanner X z not used defined RIO Status Example Scanner Configuration and Programming 5 83 The following example illustrates an M1 status file example It shows a typical M1 file and the G file used to configure the scanner There are no inhibited devices specified in the MO file not shown Notice that e Ml e 8 is an image of word 1 primary normal logical device address of the G file e Ml e 3 is an image of word 3 complementary logical device address of the G file e Ml e 9 is an image copy of word 2 primary normal logical device size of the G file e Ml e 4 is an image copy of word 4 complementary logical device size of the G file The three quarter logical rack device located in logical rack 3 M1 e 9 13 is not active The fault is indicated by the Enabled Device Fault status bit bit 0 word 0 M1 e 0 0 The three quarter logical rack device located in logical rack 11 M1 e 4 13 is not active The fault is indicated by the Enabled Device Fault status bit bit 0 word 0 M1 e 0 0 Because the device at M1 e 8 13 is faulted bit 13 of word 10 M1 e 1
45. BT to an inhibited device M1 File BTR BTW Status Flag Definitions M1 e 100 M1 e 3200 Status Flag Description 1 100 0 through These bits are reserved 1 100 9 1 100 10 Block Transfer Enabled and Waiting for block transfer to start EW i Enable Waiting 1 100 11 This bit is reserved M1 e 100 12 Block Transfer Error ER Error 2 1 100 13 Block Transfer Successful DN Done M1 e 100 14 Block Transfer Started ST Started 4 M1 e 100 15 This bit is reserved 1 When set to a 1 with bit 14 set to a 0 bit 10 indicates that a BT operation is pending You program a timer in your SLC control program to cancel a BT prior to bit 14 being set Note that bit 10 must be set to 1 before your SLC user program can cancel the BT operation When set to a 1 bit 12 indicates that an error occurred while the BT was being processed M1 e 103 contains an error code that is useful in determining the cause of an error Once this bit is set the SLC user program can reset the Enable EN bit in the MO BT buffer so that a new BT can occur When set to a 1 bit 13 indicates the successful completion of a BT operation If the operation was a BTR the BT data is available in the M1 BT buffer Once this bit is set the SLC user program can reset the Enable EN bit in the MO BT buffer so that a new BT can occur When set to a 1 bit 14 indicates that a BT operation has started Once the BT o
46. BTR VIRTUAL BT ERROR BIT Publication 1747 6 22 Rung 2 3 RIO Block Transfer 7 131 When a BTR successfully completes buffer the BTR data and unlatch the BTR enable bit Also unlatch the BTR pending bit and latch the bit that continues checking the BTR status until the SN turns off the done bit VIRTUAL BTR DONE BIT B3 13 BTR DATA FILE Source Dest Length M1 1 110 N7 10 64 BTR PENDING B3 VIRTUAL BTR ENABLE BIT CHECK BTR STATUS B3 Rung 2 4 When a BTR unsuccessfully completes buffer the error code and unlatch the BTR enable bit and the BTR pending bit Also latch the check BTR status bit in order to continue reading the status information from the scanner until it turns the error bit off completing the handshake process VIRTUAL BT ERROR BTR ERROR BIT CODE MOVE 4 4 12 Source M1 1 103 Dest N7 9 0 BTR PENDING B3 VIRTUAL BTR ENABLE CHECK BTR STATUS B3 Publication 1747 6 22 7 132 RIO Block Transfer Rung 2 6 Block transfer reads execute continuously as long as the BTR precondition bit is true BTR PRE VIRTUAL VIRTUAL VIRTUAL CONDITION BTR ENABLE BTR DONE BT ERROR BTR BIT BIT BIT BIT PENDING B3 B3 B3 B3 B3 reel eee
47. COPy is complete the DTHW Data Table handshake Word bit for Data Block 7 B3 4 6 M0 1 3411 6 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 7 Virtual DTSW Bit for Data Block 7 B3 3 COP jE Copy File 6 Source M1 1 4268 Dest N15 0 Length 128 Virtual DTHW Bit for Data Block 7 B3 4 gt 6 This rung copies the new Data Block 8 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 8 B3 4 7 M0 1 3411 7 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 8 Virtual DTSW Bit for Data Block 8 B3 3 COP J F Copy File 7 Source 1 1 4396 Dest N15 128 Length 128 Virtual DTHW Bit for Data Block 8 B3 4 o gt 7 Publication 1747 6 22 0009 0010 0011 0012 Programming Techniques 9 169 This rung copies the new Data Block 9 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 9 B3 4 8 M0 1 3411 8 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next
48. Complementary Logical Device Address Word 4 M1 File M1 e 3 15 14 13 12 11 10 9 8 7 6 5 4 1 1 1 0 0 1 1 0 1 1 3 2 1 0 1 0 0 1 GFile Word 4 RIO Rack 11 RIO Rack 10 RIO Rack 9 RIO Rack 8 Image size Image Size Image Size Image Size Complementary Logical Device Address Word 4 Active Device Status 6 4 2 0 68 4 2 0161210161 2 0 01I 3I I o o s o T 1 1 Word 10 provides active device status for primary normal devices When a RIO device is communicating with the scanner the bit corresponding to the device s logical starting group is set to 1 Devices that are inhibited in the MO file M0 e 8 M0 e 11 are represented by a 0 Unless devices are inhibited not responding to communications or configured to an incorrect logical rack size this word is identical to the device configuration M1 e 8 M1 Status File Word 10 Bit Number decimal Primary Logical Device Address Word 8 Primary Logical Image Size Word 9 Primary Active Device Status Word 10 15 14 13 12 10 9 8 7 6 5 4 3 2 1 0 RIO Rack 3 RIO Rack 2 RIO Rack 1 Starting Starting Group Starting Group Group Starting Group M1 File 6 4 2 0 6 4 2 6 4 2 6 2 0 0 0 140 0 0 lo foo 1 1 fol oft Mes 1 1 1 1 jo 1 1 1 1 amp 1 9 0l o o o o oj 1 oj o o o 1 R Mt e 10
49. Example Scanner Input Image of the Complementary Devices Below are the complementary device addresses and sizes The following figure contains primary device addresses and sizes Device 6 starting at Logical Rack 8 Logical Group 2 is a complementary 3 4 logical rack device Device 7 starting at Logical Rack 9 Logical Group 0 is a complementary 1 2 logical rack device Device 8 starting at Logical Rack 9 Logical Group 6 is a complementary 1 4 logical rack device Device 9 starting at Logical Rack 10 Logical Group 0 is a complementary 1 4 logical rack device Device 10 starting at Logical Rack 11 Logical Group 2 is a complementary 1 2 logical rack device Logical Rack 11 Logical Group 6 has no complementary device Bit Number Decimal 15 14 133 12 10 8 7 6 5 4 3 2 1 0 Word 0 i Word 1 wi Logical tends Rack 0 s 23 Word 4 Device 6 Word 5 5 Word 6 6 Word 7 7 Word 8 8 Word 9 0 9 Word 10 Device 7 Logical Word 11 e 11 Rack 1 Word 12 e 12 Word 13 0 13 Word 14 e 14 Word 15 1 Device 8 Word 16 e 16 gt Word 17 En Device 9 Word 18 10 18 Logical Word 19 9 Rack 2 Word 20 20 Word 21 0 21 Word 22 0 22 Word 23 0 23 Word 24 0 24 Word 25 0 25 TR Word 26 0 26 Word 27 16 27 Rack 3 Word 28 oa 10 Word
50. Failure After Startup of Transmission Across RIO Link Control Flag E MO Control Information 1 EN 2 TO Status Information Status Flag 5 2 T 5 2 LI ST x 3 5 ER Block Transfer Failure after Startup of Transmission Across the RIO Link This example illustrates control and status changes when a BT fails after it starts 1 The SLC control program fills in the MO BT output control buffer and sets the EN flag 2 The scanner detects the EN flag validates the MO information puts the BT request on the RIO link successfully and sets the EW and ST flags in the M1 BT input status buffer 3 The scanner receives a BT reply with some error from the RIO link device fills in the M1 BT buffer s error code field and sets the ER flag 4 The SLC control program detects the ER flag examines the M1 BT buffer error code and clears the EN flag after processing the 5 The scanner detects that the SLC control program has processed the reply in the M1 BT buffer and clears the EW ST and ER flags Publication 1747 6 22 RIO Block Transfer 7 119 SLC Control Program Cancelling a Block Transfer Once Transmitted Across RIO Link Control Flag a MO Control Information 1 Status Information SLC Control Progra
51. File Complementary Logical Device Address Word 3 Complementary Logical Image Size Word 4 Publication 1747 6 22 e slot number of the SLC rack containing the scanner x not used defined RIO Logical Rack 11 RIO Logical Rack 10 RIO Logical Rack9 RIO Logical Rack 8 Starting Group Starting Group Starting Group Starting Group 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 0 0 1 0 0 0 1 0 0 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 1 1 1 1 1 0 0 1 Important Individual quarter logical racks within a device cannot be faulted Therefore only the starting logical group of the device needs to be monitored RIO Communication Retry Counter 1 16 47 1 File Status Words 16 through 47 indicate how many RIO communication retries the scanner makes to each adapter on the RIO link if communication problems occur Each word 16 47 contains a retry counter for each configured quarter logical rack words 16 31 are for primary logical racks 0 3 and 32 47 are for complementary racks 8 11 Retry counters are useful for troubleshooting communication problems such as electrical noise or poor communication line connections between the scanner and any adapters The scanner clears the retry counters when going from Program to Run mode Test to Run mode and Program to Test mode Note that the display in words M1 e 16 31 of retry counters corresponds to the bits set in the Primary Logical Device Addr
52. M0 1 100 4 VIRTUAL BTR DONE BIT B3 0 ee 13 VIRTUAL BTR ERROR BIT B3 0 4 12 Rung 2 7 END Block Transfer Write Control Logic Example Rung 2 0 Configure the BTW length and RIO address at power up Also be sure the block transfer operation bit is a 0 indicating a BTW All these parameters must be entered prior to placing the processor in the run mode POWER UP BIT Publication 1747 6 22 COP COPY FILE Source B3 100 Dest M0 1 100 Length RIO Block Transfer 7 127 Rung 2 1 Copy the BTW status area to a binary file which will be used throughout the program only when a BTW is pending This avoids accessing the M1 file multiple times during each program scan Each time an instruction containing an M1 file bit word or file is scanned by the processor an immediate data transfer to bit word or file is scanned by the processor an immediate data transfer to the module occurs and therefore will impact the processor scan time SERVICE THE BTW STATUS BTW PENDING BTW STATUS B3 5 COB FILE 0 Source 1 1 100 Dest B3 0 Length 4 CHECK BTW STATUS UNTIL DONE BIT IS OFF B3 5 4 1 Ru
53. STATUS BTR PENDING B3 5 4 U Rung 2 4 If a BTR error occurs unlatch the enable bit and buffer the BT error code Also unlatch the BTR pending bit and latch the bit that continues checking the BTR status until the SN module turns off the error bit VIRTUAL BTR ERROR BTR ERROR BIT CODE B30 MOV eem EEqpe SS MOVE 12 Source B3 3 0000000000000000 Dest B3 4 0000000000000000 SERVICE THE BTR STATUS BTR PENDING B3 5 Ue Publication 1747 6 22 7 126 RIO Block Transfer Rung 2 5 When user logic initiates a new BTR latch the enable bit as long as a BTR is not in progress Also latch the BTR pending bit so the BTR status file will be read by the ladder program USER LOGIC TO VIRTUAL INITIATE A BT ENABLE BTR BIT Rung 2 6 VIRTUAL VIRTUAL BTR DONE BTR ERROR BIT BIT B3 0 B330 Jy 1 12 SERVICE THE BTR STATUS BTR PENDING B3 5 1 Ecc 0 B3 100 L 15 l l l l VIRTUAL l l l l Move the virtual control word to the MO file for the SN module whenever a transition of the enable bit occurs VIRTUAL BT ENABLE BIT B3 100 MOV MOVE 15 Source B3 100 0000000000000000 Dest
54. Serial Link status This bit is set when the HSSL is faulted or has communication errors in the local 1747 BSN module bit 0 or in the remote one bit 8 The normal state of this bit is OFF LSL Local Status Link status This bit is set when the Local Status Link is not working well in the local system bit 1 or remote system bit 9 If the system has only one 1747 BSN module in each chassis then the LSL is not used and this bit 1s reset The normal state of this bit is OFF Buffer Full This bit is set when the secondary 1747 BSN is receiving a second block of data before the reading of the first block by the secondary SLC 5 0x It could be occurring in the local system bit 2 or remote system bit 10 DH Communication This bit is set when a problem occurs with the DH network in the local bit 3 or remote bit 11 1747 BSN module The type of problem that may occur is different for primary and secondary systems as shown below The normal state of this bit is OFF 1 Primary mode the network is down or the channel is seeing communication errors 0 Secondary communication errors to the secondary SLC 5 04 Transferring Data over the High Speed Serial Link HSSL Module Control and Status Word 6 93 RIO Communication This bit is set when a problem occurs with the RIO link in the local bit 4 or remote bit 12 1747 BSN module The type of problem that may occur is different for primary and secondary systems as
55. Source N13 0 Dest M0 1 3500 Length 128 Virtual DTCW Bit for Data Block 1 B3 7 AT lt gt 0 Unlatch the virtual DTCW bit for Data Block 1 when the comparable virtual DTSW bit is set by the BSN module to indicate t at it has received the last data via data Bloc 1 when B3 7 0 has been unlatched the BSN module is ready for the next data transfer via Data Block 1 Virtual DTSW Bit for Virtual DTCW Bit for Data Block 1 Data Block 1 B3 6 B3 7 US 1 M 0 0 This rung monitors the DTCW and DTSW bits for Data Block 2 When a transfer of data using Data Block 2 is not in progress copy to 128 words to the appropriate M file location for Data Block 2 in the BSN module Virtual DTCW Bit for Virtual DTSW Bit for Data Block 2 Data Block 2 B3 5 B3 6 COP Vt Tt Copy File 1 1 Source N13 128 Dest M0 1 3628 Length 128 Virtual DTCW Bit for Data Block 2 B3 7 AT Q gt 1 Unlatch the virtual DTCW bit for Data Block 2 when the comparable virtual DTSW bit is set by the BSN module to indicate t 32 when B3 7 1 has been unlatched the BSN module is ready for the next data transfer via Data Block 2 Virtual DTSW Bit for at it has received the last data via data Bloc Publication 1747 6 22 Virtual DTCW Bit for Data Block 2 Data Block 2 B3 6 B3 7 i E W 0005 0006 0007 0008 0009 0010 0011 0012 Programming Techniques 9 173 This ru
56. Test mode by using words 16 19 Remote Output Reset command an RIO device s outputs to reset upon the SLC processor leaving Run mode regardless of the RIO device s Hold Last State setting or while in Test mode by using words 24 27 If you do not modify the Device Reset and Remote Output Reset words the device outputs reflect the scanner output image whenever the SLC processor is in Run mode If the SLC processor is in Program Test or Fault mode it instructs the device to reset its outputs M file data is nonretentive Upon entering Run or Test modes the SLC processor sets the MO file to a default state The processor does not use the MO file until a full program scan occurs after entering Run mode This allows you to change the M file settings before they take effect Important The 1747 BSN module does not use MO words 0 7 MO Control File RIO Device Control Words Logical Rack 0 Remote Output Reset Word 24 Logical Rack 1 Remote Output Reset Word 25 Logical Rack 2 Remote Output Reset Word 26 Logical Rack 3 Remote Output Reset Word 27 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 x x x x x x x x x x x x 0 1 1 0 X x X x x x x x x x x 0 0 0 0 x x x x x x x x x x x x 1 0 0 1 x x x x x x x x x x x x 0 0 0 1 x x x x X x x x x x x 0 0 0 0 x x x x x x x x x x x 0 0 0 0 x x X x x x x x x x x x 0 0 0 0 x x X X x x x x x x
57. The information contained in word 3 4 and 5 indicates a 3 4 logical rack device beginning at group 2 is inhibited faulted or configured to an incorrect logical rack size this device is confirmed in bits 5 6 and 7 of Device Fault Status Word 15 Logical Rack 0 Device Fault Status Word 12 Logical Rack 1 Device Fault Status Word 13 Logical Rack 2 Device Fault Status Word 14 Logical Rack 3 Device Fault Status Word 15 15 14 13 12 10 9 8 7 6 5 4 3 2 1 0 RIO Rack 3 RIO Rack 2 RIO Rack 1 RIO Rack 0 Starting Group Starting Group Starting Group Starting Group M1 File 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 olo t o olo t olo o 01 14 0 0p 1 8 1 1 1 0 4 B 0 1 1 NE 1 LUN M1 e 9 0 0 0 0 0 0 1 0 0 0 0 gt 1 1 0 0 1 1 10 M1 File x x x x x x 0 0 0 0 1 12 x x x x x x 0 0 0 0 1 13 x x x x x SER 0 0 0 0 1 14 x x x x 1 1 1 0 Mf e 15 e slot number of the SLC rack containing the scanner X z not use defined M1 Status File Complementary Device Fault Status 15 14 13 12 10 9 8 7 6 5 4 3 2 1 0 RIO Rack 11 RIO Rack 10 RIO Rack 9 Starting Rack 8 Starting Group Starting Group Group Starting Group 6 4 2 4 2 0 6 4 2 4 2 MIFile olo ol oljolt ololo 14 0 0p M1 e 3 1 1 1 o 4
58. and the last BSN module Important Note that all RIO devices must be configured for the same baud rate Refer to Chapter 3 Installation and Wiring to configure the switches 3 Insert the 1747 BSN module into the chassis ATTENTION Never install remove or wire modules with power applied to the chassis or devices wired to the module Make sure system power is off then insert the scanner module into your 1746 chassis In this example procedure local slot 1 is selected E 18 W WW SS YR WO NS C Top and Bottom Module Release 4 Connect all RIO link devices Ensure that you Daisy chain each RIO link device Ground the shield drain wire to the nearest chassis mounting bolt Connect the appropriate termination resistors on each end of the link Publication 1747 6 22 Quick Start for Experienced Users 2 43 5 Configure the system Set up your system I O configuration for the particular slot in which you installed the scanner slot 1 in this example If the 1747 BSN is not yet listed in your version of programming software select Other and type in a module ID code of 13608 6 Enter the number of scanned words Enter the number of Scanned Input and Output Words using the Specialty I O and Advanced Setup menus The default value is 32 I O words You can specify less than 32 and reduce the processor scan time by transferring only the part of the input and output image that your applicatio
59. another BT already being processed on the same logical rack backup scanner to schedule a pending bit adapter to acknowledge the request backup scanner to initiate the BT and transfer the data SLC control program to detect that the BT has completed DN flag set This is dependent on the SLC processor you are using Referto the equations that follow The RIO network allows only one BT per logical rack not logical device per RIO scan Therefore if multiple BTs are performed on devices within the same logical rack BTs have to wait in the queue until any previously scheduled BTs for the same logical rack are completed This is dependent on the RIO adapter Publication 1747 6 22 194 Specifications The time to free up the BT buffer by clearing the EN flag so another BT can be performed depends on the instruction time of the MO file write which clears the EN flag time for the backup scanner to detect that the EN flag has been cleared time for SLC control program to detect that the DN flag has been cleared The formula to calculate BT throughput is Tmo TsNo bt number of BTs 1 Thtwait 2T RIO 2 Tadp bt Tps The equation for freeing up the BT buffer is Tmo TSNo bt number of BTs Tps Substitute values for the variables in the formulas above Locate these values in the following documents Variable Variable Description Location of Variable Tmo Time
60. block of data via Data Block 9 Virtual DTSW Bit for Data Block 9 B3 3 qJ F Copy File 8 Source M1 1 4524 Dest N16 0 Length 128 Virtual DTHW Bit for Data Block 9 B3 4 d 8 This rung copies the new Data Block 10 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 10 B3 4 9 M0 1 3411 9 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 10 Virtual DTSW Bit for Data Block 10 B3 3 4 9 Source 1 1 4652 Dest N16 128 Length 128 Virtual DTHW Bit for Data Block 10 B3 4 oN og 9 This rung copies the new Data Block 11 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 11 B3 4 10 M0 1 3411 10 must be set to inform the secondary BSN that the secondary processor has received the latest Data Bloc and is now ready for the next block of data via Data Block 11 Virtual DTSW Bit for Data Block 11 B3 3 qJ F Copy File 10 Source 1 1 4780 Dest N17 0 Length 128 Virtual DTHW Bit for Data Block 11 B3 4 d 10 This rung copies the new Data Block 12 data from the seconda
61. controlling the process connections for remote I O and Data Highway Plus network the 1747 BSN module routes the remote I O network and the Data Highway Plus network to the primary processor isolation of the systems in order to guarantee that a fault in one system does not affect the other diagnostics information remote programming capability for secondary processor The secondary processor is in the DH network the capability of switching two communication channels one configurable as RIO or DH and one RS 232 485 for DH485 minimal user programming impact use of standard SLC 5 02 or later and 1746 platform no need for special chassis or processor no added cost if you are not using backup Required Tools and Equipment Chapter 2 Quick Start for Experienced Users This chapter helps you to get started using the Backup Scanner We base the procedures here on the assumption that you have a basic understanding of SLC 500 products You must understand electronic process control beable to interpret the ladder logic instructions for generating the electronic signals that control your application Because it is a start up guide for experienced users this chapter does not contain detailed explanations about the procedures listed It does however reference other chapters in this book where you can get more detailed information It also references other documentation that may be helpful if you are unfamiliar with p
62. does affect system performance Set the control flags in M0 e x00 Where x block transfer buffer number See the tables below for read write settings If You Want to Transfer Data Use To the scanner from the adapter BTR Block Transfer Read From the scanner to the adapter BTW Block Transfer Write If You Want to specify a Do this to the M0 e x00 7 file BTR Block Transfer Read Set the bit to 1 to specify a read operation BTW Block Transfer Write Set the bit to 0 to specify a write operation Specify the length of the data you wish to block transfer in word 0 01 Note that maximum length is 64 words Specify the device s logical rack group and slot in word 0 02 Set up your SLC control program to set the EN bit Quick Reference to The tables below provide a quick reference for block transfer status Status and Control and control bits In the tables x the block transfer file Bits Status Bits This Bit Is Set Enable Waiting EW upon the scanner s first detection of EN being set The EW 1 00 10 bit gets reset when the EN flag resets Error ER M1 e x00 12 when the scanner detects that the block transfer failed The ER bit is reset when the EN flag resets Done DN Mt e x00 13 at completion of the block transfer if the data is valid The DN bit is reset when the EN flag resets when the scanner schedules the BT for the adapter The Start ST M1 e
63. group and slot are combined into one word M0 e 102 Logical Address Example Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Logical Rack 0 Word 8 Word 9 Logical Rack 3 Input Image Output Image Publication 1747 6 22 Low Byte Logical Slot 1 High Byte Which Slot Number To Use When your adapter is configured for 2 slot addressing O is the left slot and 1 is the right slot For both 1 slot and 1 2 slot addressing the slot number is always Example M0 e 102 Configurations The Slot Number 0 or 1 in M0 e 102 indicates the logical slot number within a logical group 0 designates the least significant image byte and 1 designates the most significant image byte The first Logical Rack 0 Group 0 Slot 0 0 umber Logical Rack 0 Group 0 Slot 1 7 1 reading from Logical Rack 2 Group 3 Slot 1 23 Light to left is Logical Rack 0 Group 7 Slot 0 70 Slot Number M1 103 The BTR BTW error code Refer to the M1 File Error Codes table on the following page M1 e 104 through M1 e 109 These words are reserved M1 e 110 through M1 e 173 BTR data Words 0 through 63 M1 File Input Status BT Buffer Layout M1 e 100 M1 e 3200 M1 File BTR BTW Error Codes M1 e 103 M1 e 3203 M1 Address where MO Address for M0 Address BT Status Buffer
64. in case an error ocurs VIRTUAL BTW DONE BTW BIT PENDING N7 64 B3 4 4 U 13 1 VIRTUAL VIRTUAL BTW ERROR BTW ENABLE BIT BIT N7 64 17 53 4 U 12 15 CHECK BTW STATUS B3 R L 2 2 2 3 BTW ERROR CODE TXMOV Source M1 1 203 Dest 7 22 ol Rung 2 8 aaa aaa This rung and the next rung toggles between executing a BTR and a BTW VIRTUAL VIRTUAL VIRTUAL BTR ENABLE BTW ENABLE BTR DONE BTR ERROR BTR BIT BIT BIT BIT PENDING N7 50 N7 53 N7 60 N7 60 B3 ly poesie if asse d occus ss 15 15 13 12 0 VIRTUAL BTR ENABLE BIT N7 50 t L 15 Publication 1747 6 22 7 154 RIO Block Transfer Rung 2 9 VIRTUAL VIRTUAL VIRTUAL BTR ENABLE BTW ENABLE BTW DONE BIT BIT BIT N7 50 N7 53 N7 64 lp 1 1 15 15 13 Rung 2 10 VIRTUAL BTR ENABLE VIRTUAL BTR DONE BIT N7 60 deese d BTR ERROR BIT N7 60 4 Publication 1747 6 22 VIRTUAL BTW ERROR BIT N7 64 L2 L BTW DATA COPY FILE Source 1N7 10 Dest M0 1 210 Length 11 VIRTUAL BTW ENABLE BIT N7 53 15 BTW
65. long as these rungs are scanned VIRTUAL VIRTUAL VIRTUAL BTR ENABLE BTR DONE BT ERROR BTR BIT BIT BIT PENDING B3 B3 B3 B3 17 E eere ee ae ie E E 1615 13 12 80 VIRTUAL ENABLE BIT B3 1 1615 Rung 2 6 Move the virtual control word to the MO file for the SN module while a BTR is in progress and continue doing so until the scanner turns the done error bit off VIRTUAL BTR ENABLE 1615 Source B3 100 0000000000000000 Dest M0 1 100 VIRTUAL BTR DONE BIT 7 135 Publication 1747 6 22 7 136 RIO Block Transfer Publication 1747 6 22 Directional Non Continuous Block Transfer Example The following rungs demonstrate a directional non continuous block transfer The block transfer executes once for every false to true transition of the input Please note that the input bit I 2 0 0 was chosen randomly for this example and can be any address in your program used to initiate a BTR Also note that this same method may be used for a BTW Rung 2 0 Configure the BTR operation type length and rio address at power up Bit B3 100 7 must be set prior to going to run to indicate a BTR operation POWER UP BTR BIT CONTROL S 1 COP COPY FILE 15 Source B3 100 Dest 0 1 100 Length 3 4
66. must be empty In the right slot of the complementary I O group you can place an 8 point output module this slot must be empty if the corresponding slot in the primary I O group is a block transfer module 1 slot 1 2 slot Leave the corresponding I O group in the complementary chassis empty The following example illustrates how I O modules requiring two words of the input or output image can leave unused image space Publication 1747 6 22 Slot Pair Primary Chassis Input Module O Output Module Primary Chassis Configured As Slot Pair 1 31 Overview 0 1243 Complementary Chassis Complementary Chassis Configured 5 Logical Logical Rack Number 8 decimal Image size logical groups 16 Logical Group Number 16 Addressing Mode 1 2 slot gica groups 1 2 slot Primary Complementary Primary Bc essing Mode OE rimary Complementary omplementary Primary Chassis I O Image Complementary Chassis I O Image Input Image Output Image Input Image Output Image from Primary Chassis from Primary Chassis from Complementary Chassis from Complementary Chassis 17 10 7 0 Octal 11 10 7 0 Octal 17 10 0 Octal 17 A E 0 Octal 15 8 7 Decimal 15 8 7 Q Decima
67. not inhibit the device To resume scanning a device reset the bit which corresponds to the starting group address of the device to 0 Inhibiting a device does not affect the current settings of the Device Fault Status words 12 15 of the M1 file Inhibited devices eventually time out and either return to their last state or reset depending on the device s last state setting Default When the processor enters the Run mode the scanner automatically inhibits any device not configured in the G file bit set to 1 Attempting to inhibit an unconfigured device has no effect MO Control File Words 8 through 11 Not Defined Starting Group 6 4 2 o 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 o File x x x x x x x x x x x x o 1 1 o 0 8 0 o 0 9 x x x 1 0 0 1 10 x x x x x x x x x x x x 9 1 0 11 slot number of the SLC rack containing the scanner X not used defined Example of Device Inhibit Control The 1747 BSN Scanner inhibits sets to 1 the bits in M0 e 8 through 0 11 by default wherever there are no configured devices present The illustration below compares the configured devices G file word 2 to the groups that the scanner automatically inhibits RIO Logical Rack 3 RIO Logical Rack 2 RIO Logical Rack 1 RIO Logical Rack 0 Starting Group Starting Group
68. of Logical Racks Configured The number of logical racks configured is determined by the number of racks that contain configured devices For example if there are four 1 4 rack devices in logical rack 0 and one full rack device in logical rack 3 there would be two logical racks configured Note that the number of logical devices on the RIO network affects only and only affects TSNo when additional logical racks are used Publication 1747 6 22 196 Specifications Publication 1747 6 22 When complementary mode is selected the number of configured racks is also determined by the number of primary or complementary racks configured but not by both The maximum number of configured racks is 4 That is if there is a primary rack configured with a corresponding complementary rack that is considered one logical rack If there is a primary rack configured without a complementary rack or vice versa that also is considered one logical rack Without File Writes Normal Mode ce Conan All Baud Rates if Tupd_Thold Thold if gt Thold 1 Logical Rack 5 0 5 0 2 5 2 Logical Racks 7 0 7 0 4 0 3 Logical Racks 9 0 9 0 5 5 4 Logical Racks 11 0 11 0 7 0 1 Files Appendix B MO M1 Files and Files This appendix contains important information about 1 files and G files The information is general in nature and supplements specific information cont
69. on a logical device basis not on an adapter basis A logical device is a full logical rack or portion of a logical rack assigned to an adapter lt RIO Scanner Scan Scanner Input Output Devic Input Image File 3 Device 1 The scanner its input image file each time it scans a logical device Device Device Output il Input Device Device 2 2 A a Scanner Output Image File Publication 1747 6 22 SLC and Scanner Asynchronous Operation SLC Processor Scan Cycle The SLC processor reads the scanner input image file into the SLC input image file processes it and creates an SLC output image file The SLC processor transfers its output file to the scanner Overview 1 21 The SLC processor scan and RIO scanner scan are independent asynchronous of each other The SLC processor reads the scanner input image file during its input scan and writes the output image file to the scanner during its output scan The RIO scanner continues reading inputs and writing outputs to the scanner I O image file independent of the SLC processor scan cycle Depending on your SLC processor RIO link configuration and application program size the scanner may complete multiple scans before the SLC processor reads the scanner s input image file The RIO scanner updates its I O files on a per logical rack basis The figure below illustrates the asynchronous operation of the SLC processor and RIO sca
70. plus Allen Bradley representatives in every major country in the world Local Product Support Contact your local Allen Bradley representative for sales and order support product technical training warranty support support service agreement Technical Product Assistance If you need to contact Allen Bradley for technical assistance please review the information in Chapter 6 Module Diagnostics and Troubleshooting first Then call your local Allen Bradley representative Your Questions or Comments on the Manual If you find a problem with this manual please notify us using the self mailer Publications Problem Report in the front of this manual If you have any suggestions for how this manual could be made more useful to you please contact us at the address below Allen Bradley Company Inc Control and Information Group Technical Communication Dept A602V T122 P O Box 2086 Milwaukee WI 53201 2086 Publication 1747 6 22 16 Publication 1747 6 22 System Overview Chapter 1 Overview This chapter contains the following information system overview how the scanner interacts with the SLC processor how the scanner interacts with adapter modules scanner I O image concepts extended node capability complementary I O scanner features compatible network devices backup concepts for the SLC 500 system The 1747 BSN Backup Scanner provides redundancy for Remote I O RIO RS232 c
71. processor the same node address in the DH link The 1747 BSN module reserves the subsequent node address as an access point address to the secondary processor that is this address is accessed by a programming device in order to program the secondary processor This means that if you set both processors node addresses to n the programming device can communicate with the secondary processor with the node address n 1 Therefore do not use node address n 1 for any other device on the DH network For example a primary processor with node number 16 on network has the same address switch setting as the secondary processor node However in this situation the terminal addressed to station 16 attaches to the primary processor and the terminal addressed to station 17 attaches to the secondary processor Important It is recommended to assign the same node address n for both processors primary and secondary in a redundant system You must also reserve the next node address n 1 because this address is the access point address to the secondary processor Operating Your SLC 500 Backup System 4 55 The figure below shows how the programming device sees the secondary processor which is not physically connected to the link Important The DH connection to the secondary processor is meant for remote programming only Also only one terminal at a time may connect to the secondary processor No DH messages can be sent to or fro
72. shown below The normal state of this bit is OFF 1 Primary mode the channel is faulted or has communication errors 0 Secondary no communication could be seen by this module in the RIO link This indicates that the primary RIO link is not working or that a problem exists in the RIO connection to the secondary 1747 BSN module Processor Fault This bit is set when one of the processors SLC 5 0x either the local bit 5 or remote bit 13 is in failure or is in Program or Test mode The normal state of this bit is OFF Primary Secondary System This bit is set when the local bit 6 or remote bit 14 system is in the primary mode otherwise the system is in the secondary mode Bits 6 and 14 are never set at the same time During power up or switchover time these bits can be clear at the same time The normal operation is with one bit set for the primary system and one bit clear for the secondary system Two MO file words and one 1 file word are used to control the transfer of data from the primary SLC processor to the secondary SLC processor This link should be used to transfer internal processor data that must be kept current in the secondary processor in the event that a switchover takes place making the secondary processor the primary processor Actual input data from remote I O chassis need not be transferred over this link since the secondary BSN allows the secondary processor to receive this data from the remote
73. starting group is not the same the image of the complementary device must not cross over into the space of a primary device For example if a primary device exists at Logical Rack 1 Logical Group 4 the maximum size of a complementary device at Logical Rack 9 Logical Group 0 is a half logical rack The image does not cross over into Logical Group 4 A complementary device cannot be configured at locations where primary devices are configured unless they both start at the same location If you configure your system so that complementary I O is not selected words 3 and 4 are zero you must not set up any of the actual devices to be in the primary mode If you do the system flags the device as faulted and prevents the device from running Control functions i e device inhibit device reset and device output reset are only selectable for the primary device but also apply to the complementary device Control functions for complementary devices cannot be exclusively enabled Publication 1747 6 22 5 64 Scanner Configuration and Programming Publication 1747 6 22 Example G File Showing Primary and Complementary Device Configurations In the example that follows the scanner is configured to communicate with primary and complementary devices Below are the device addresses and image sizes Logical Racks 0 8 Logical Group 2 contain a primary 3 4 logical rack device and a complementary 3 4 logical rack device Logical Rac
74. terminal pinout is shown below ATTENTION Disconnect power to the SLC before attempting to install remove or wire the removable terminal wiring block Installation and Wiring 3 49 EM HSSL Line 1 Blue LG L 9 HSSL Shield HSSL Line 2 Clear 232 485 A to Link 232 485 B to CPU DH Shield to CPU ii DH Line 1 to CPU 4 C5 DH Line 2 to CPU TS E 5 RIO DH Line 2 to Link el Release Screw Terminal screws accept a maximum of two 14 AWG 2mm 2 wires Tighten terminal screws only tight enough to immobilize wires Maximum torque on terminal screws is 0 9 Nm 8 in lbs HSSL Wiring Connect the HSSL to establish communication between the primary and secondary systems Maximum cable length for the HSSL is 4 5 m 15 ft Local Status Link Wiring If you have more than one 1747 BSN module in the same chassis connect the LSL in series between modules in the same chassis RIO Link Wiring The backup module is connected to other devices on the RIO link in a daisy chain serial configuration There are no restrictions governing the space between each device provided the maximum cable distance Belden 9463 is not exceeded A 1 2 watt terminating resistor included with the module must be attached across line 1 and line 2 of the connectors at each end scanner and ast physical device of the RIO link The value of the resistor d
75. the node address assigned to both processors The secondary processor will effectively assume node address 1 for programming purposes The commands that the primary processor receives are sent through the HSSL to the secondary 1747 BSN and then to the secondary processor the secondary 1747 BSN emulates the DH network for the secondary SLC 5 04 The replies come back to the primary 1747 BSN again through the HSSL and are sent to the DH network This link has a functionality similar to that found in the 1785 BCM series B and C The link is designed to make remote programming possible for the secondary SLC 5 04 The primary SLC 5 04 is connected to the DH network through the primary 1747 BSN communication channel relays and sends receives messages without any intervention of the 1747 BSN module Dumb In this mode the communication channel is disabled and is used only as a relay that is closed when the 1747 BSN is in the primary mode and otherwise is open Primary SLC 5 04 2 Primary HSSL Secondary 1747 SN 1747 SN emulation emulation ot y 1747 BSN 1747 BSN SLC 5 04 Remote I 0 Link HSSL Secondary Y Y e SLC 5 04 E 1747 BSN e m 1747 BSN gt SLC 5 04 DH Network Publica
76. the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 2 B3 4 1 M0 1 3411 1 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 2 Virtual DTSW Bit for Data Block 2 B3 3 COP 0002 JE Copy File 1 Source M1 1 3628 Dest N12 128 Length 128 Virtual DTHW Bit for Data Block 2 B3 4 Cy 1 This rung copies the Virtual DTHW word B3 4 to the actual DTHW word 0 1 3411 located in the 1747 BSN module M file accesses are interrupts to the processor and using virtual words minimizes M file accesses and therefore minimizes the effects of these transfers on the ladder program scan time Virtual amp Actual DTHW Words MOV 0003 Move Source B3 4 0000000000000000 lt Dest 0 1 3411 I lt 0004 CEND Publication 1747 6 22 Module Control and Status Word 6 99 Program File 4 The following 6 rungs are meant to be executed only when this processor BSN is in the Primary Mode When it is acting as the Primary Processor this rung copies the DTCW and DTSW words to internal storage words within the SLC processor B3 5 and B3 6 respectively for this example Virtual amp Actual DTCW Words MOV 0000 Move Source 0 1 3410 x Dest B3 5 0000000000000000 lt Virtual amp Actual DTSW Words MOV Move So
77. transfers to occur before the scanner processes a block transfer Refer to chapter 5 RIO Block Transfer for more details Overview 1 25 Physical and Logical RIO Link Specifications The maximum number of adapters with which your scanner can communicate is determined by the scanner s and adapter s physical and logical specifications as described below Physical Specifications are the maximum number of adapters that can be connected to the scanner For more information see Extended Node Capability below Logical Specifications for the scanner are the maximum number of logical racks the scanner can address how the logical racks can be assigned and whether the scanner can perform block transfers Extended Node Capability Extended node functionality allows you to connect up to 32 physical devices on an RIO link You must use 82 Ohm termination resistors in an extended node configuration You can only use extended node if all RIO link devices have extended node capability Refer to the Compatible Devices table at the end of this chapter or to the specifications of your device The 1747 BSN Scanner has extended node capability However the smallest logical rack division is 1 4 logical rack and the scanner image size is 4 logical racks Therefore the scanner is limited to 16 devices unless complementary I O is used Refer to the following section for more information on complementary I O Complementary I O Complementary I O
78. with the first pass bit at powerup S 1 M0 2 1 This rung is true 1t U 4 forthe first scan 15 1 after powerup to unlatch 0 2 1 1 B3 MO 2 1 E C 0 1 M0 2 1 l t 1 G Files MO M1 Files and Files B 205 Some specialty I O modules use G configuration files indicated in the specific specialty I O module user s manual These files can be thought of as the software equivalent of DIP switches The content of G files is accessed and edited offline under the I O Configuration function You cannot access G files under the Monitor File function Data you enter into the G file is passed on to the specialty I O module when you download the processor file and enter the REM Run or any one of the REM Test modes Configuring G Files The G file is configured as part of the I O configuration procedure for the processor file After you have assigned the specialty I O module to a slot the procedure is the same as assigning other modules except that you must specify the ID code of the specialty I O module the following functions appear at the bottom of the screen F1 I O CONFIGURATION FOR EXAMPLE RACK 1 RACK 2 RACK 3 ESC exits HEAD DELE UNDEL EXIT SPIO CONFIG CONFIG RACKS SLOT SLOT SLOT CONFIG F6 F2 SLOT Module s ID Code 12705 F4 F5 F7 F8 F9 This is the starting point for configuring the G file and other parameters of the specialty
79. x 0 0 0 0 x x x x x x x x x x x x 1 0 0 1 x x x x x x x x x x x x 0 0 0 1 x x x x x x x x x 0 0 1 0 x x x x x x x x x x x 0 0 1 0 e slot number of the SLC rack containing the scanner bit not used defined Important Control functions i e device inhibit device reset and device output reset are only selectable for the primary device but also apply to the complementary device Control functions for complementary devices cannot be exclusively enabled Publication 1747 6 22 5 72 Scanner Configuration and Programming MO File RIO Device Inhibit Control Bit Number decimal Logical Rack 0 Device Inhibit Word 8 Logical Rack 1Device Inhibit Word 9 Logical Rack 2 Device Inhibit Word 10 Logical Rack 3 Device Inhibit Word 11 G File Device Address Word 1 MO Control File Bit Number decimal Logical Rack 0 Device Inhibit Word 8 Logical Rack 1Device Inhibit Word 9 Logical Rack 2 Device Inhibit Word 10 Logical Rack 3 Device Inhibit Word 11 Publication 1747 6 22 Words 8 through 11 you use these words to command the scanner to stop scanning logical racks 0 1 2 and 3 Bits 0 3 in each word correspond to I O group locations within logical racks 0 1 2 and 3 To stop scanning inhibit a device listed in the configuration G file set the bit corresponding to the starting group address of the device to 1 Setting bits that do not correspond to the device logical starting group address does
80. x00 14 data transfers may not start for some time The ST bit is reset when the EN flag resets Publication 1747 6 22 Block Transfer Read Control Logic Example Control Bits This Bit Read Write RW M0 e x00 7 RIO Block Transfer 7 123 Is Set by your SLC control program A 0 indicates a write operation a 1 indicates a read operation Timeout TO M0 e x00 8 if you leave the timeout bit reset the scanner repeatedly tries to send a block transfer request to an unresponsive module for four seconds before setting the ER bit If you set the TO bit through your SLC program the scanner attempts to cancel the BT request Enable EN M0 e x00 15 by your SLC control program to initiate a BT request The following pages contain generic BTR and BTW control logic examples Publication 1747 6 22 7 124 RIO Block Transfer Block Transfer Read Control Logic Example Rung 2 0 Configure the BTR operation type length and rio address at power up Bit b3 100 7 must be set prior to run to indicate a BTR operation POWER UP BTR BIT CONTROL 5 1 COPY FILE 15 Source B3 100 Dest M0 1 100 Length 3 p Rung 2 1 Copy the status area to a binary file which will be used throughout the program This avoids addressing the M1 file multiple time during each program scan Each time an i
81. 0 0 1 1 0 0 Mt e 3 Starting Group tarting Group Starting Group Starting Group 6 4 2 0 2 6 4 2 0 4 2 0 0 0 9 0 0 0 1 0 0 0 0 1 1 0 0 RIO Logical Rack 11 RIO Logical Rack 10 RIO Logical Rack9 RIO Logical Rack 8 RIO Logical Rack 8 Starting Group 2 Starting Group 2 Starting Group 2 Starting Group 6 Starting Group 0 Logical Device Image Size Status Word 9 provides status feedback of the logical device image size you configure in word 2 of the G file primary normal devices A bit set to 1 shows the logical image size of each logical device Writing to word 1 file word 9 does not alter the contents of the G file M1 Status File Word 9 15 14 13 12 1 170 9 8 7 6 5 4413 2 1 MFile Primary Logical Device Address Word 9 1 1 1 0 0 1 1 0 1 1 1 1 1 0 0 1 GFile Word 2 RIO Rack 3 RIO Rack 2 RIO Rack 1 RIO Rack 0 Image Size Image Size Image Size Image Size 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 Primary Logical Device Address Word 2 1 1 1 0 0 1 1 0 1 1 1 1 1 0 0 1 Publication 1747 6 22 5 80 Scanner Configuration and Programming Word 4 provides status feedback of the logical device image size you configure in word 4 of the G file complementary devices A bit set to 1 shows the logical image size of each logical device Writing to word 1 file word 4 does not alter the contents of the G file M1 Status File Word 4
82. 0 13 is 0 M1 e 15 1 through M1 e 15 3 which correspond to M1 e 9 13 through M1 e 9 15 are also set to 1 indicating a problem with the device in logical rack 3 Because the device at M1 e 3 13 is faulted bit 13 of word 5 M1 e 5 13 is 0 M1 e 15 5 through M1 e 15 7 which correspond to M1 e 4 13 through M1 e 4 15 are also set to 1 indicating a problem with the device in logical rack 11 M1 Status File Primary Normal Bit Number decimal Status Word Word 0 Baud Rate Word 2 Primary Device Address Word 8 Primary Device Size Word 9 Primary Active Device Status Word 10 Logical Rack 0 Device Fault Status Word 12 Logical Rack 1 Device Fault Status Word 13 Logical Rack 2 Device Fault Status Word 14 Logical Rack 3 Device Fault Status Word 15 G Fil Primary Logical Device Address Word 1 Primary Logical Image Size Word 2 15 14 13 12 10 9 8 7 6 5 4 3 2 1 o Me x x x x x x x 1 1 1 0 x x x x X X x x X X X x 0 1 M1 e 2 RIO Logical Rack RIO Logical RIO Logical RIO Logical 3 Rack 2 Rack 1 Rack 0 0 0 1 0 0 0 1 0 0 0 0 1 1 0 0 1 3 1 Mfe4 Mte5 x x x x x x x x x x x x 0 0 0 0 1 12 x n x x x x x x x x x x 0 0 0 0 Mt e 13 X x x x x x x x x x x x 0 0 0 o Mt e 14 x X x x x x x X X X 1 1 1 0 M1 e 15
83. 0 30 0 39 0 4 Logical Racks 25 0 28 0 34 0 42 0 Determining Before determining you need to establish the maximum BT write or read length that is to be processed by each logical rack on the RIO link RIO scan time is increased each time an BT is sent to any logical device on the RIO network The scan time increase depends on the number of words sent in the BT and the selected baud rate RIO link protocol allows for a maximum of one BT to be sent to each logical rack on the RIO link during any single RIO scan Therefore if multiple BTs are sent to devices within the same logical rack only the longest BT to that logical rack needs to be considered to determine your maximum throughput The RIO scan time increase Ty for each logical rack is Baud Rate RIO Scan Time Increase Tyi 57 6K baud 0 300 x BT length 5 0 ms 115 2K baud 0 150 x BT length 4 3 5 ms 230 4K baud 0 075 x BT length 2 0 ms The total increase in the RIO scan time Tp is equal to Tptx sum of Tri for all logical racks Example Discrete I O Throughput with Block Transfers Present An SLC 5 03 is using a backup scanner to control a 115 2K baud RIO link that has 3 adapters and 4 logical devices Adapter 1 1747 ASB module starting logical rack 0 logical group 0 12 logical groups 1 1 2 logical racks one 8 word and two 4 word BT write read modules in logical rack 0 one 2 word BT write read module in logical ra
84. 1 1 1 22 4 1 6 2 6 4 G 2 Hold last state 5 16 HSSL wiring 3 5 I image data 1 3 Inhibit G 2 Input file G 2 Input image data 5 1 Input image file 1 5 Input signal update time 8 2 Input status buffers 7 9 Internal watchdog timeout 8 4 L Local expansion chassis G 2 Local serial link 1 1 Local SLC chassis G 2 Local status link 1 22 6 2 6 4 Local status link wiring 3 5 Logic instructions 9 18 Logical device 1 4 G 2 Logical device address 5 3 5 26 Logical group 1 3 G 2 Logical groups 5 1 5 2 5 5 Logical image size 5 3 Logical rack G 2 Logical racks 1 3 5 1 5 2 5 5 5 9 Logical slot G 2 Logical specifications 1 9 Logical words 5 1 5 2 Loosely synchronized backup Low byte 5 2 7 6 M M files G 2 MO and 1 data files capturing MO M1 file data B 7 minimizing the scan time B 6 specialty I O modules with retentive memory B 8 MO file 6 5 7 5 MO files 5 10 MI file 6 5 7 3 MI files 5 10 Message instructions 9 19 Module address switch 1 19 3 2 Module status word 4 5 6 4 6 9 6 13 G 3 N Noise immunity 1 Operating temperature 1 Output delay time A 11 Output file G 3 Output image file 1 5 Physical specifications 1 9 PID instructions 9 20 Primary chassis 1 10 Primary device 5 7 Primary mode 5 3 6 4 6 5 Primary module 1 1 Primary system 1 22 6 2 6 5 6 6 Processor fault 6 2 6 5
85. 1 200 Publication 1747 6 22 7 150 Rung 2 0 1 to indicate a BTR and N7 53 7 must be a logical 0 to indicate a BTW operation POWER UP BTR BIT CONTROL Sel JFOOB u Ses eec uer TM COPY FILE dr 15 Source N7 50 Dest 0 1 100 Length 3 4 BTW OPERATION TOOBP e COPY FILE dem Source 7 53 Dest M0 1 200 Length 3 Pea ee SSS Rung 2 1 Copy the BTR status area to an integer file only when a BTR is in progress This status data is then used throughout the program and will limit the number of M file accesses BTR PENDING BTR STATUS B3 que COPY FILE 0 Source 1 1 100 Dest N7 60 Length 4 4 CHECK BTR STATUS B3 pee 2 RIO Block Transfer Bidirectional Alternating Repeating Block Transfer The following rungs demonstrate a bidirectional alternating repeating block transfer Using these rungs ensures the block transfer requests are executed in the order in which they are sent to the queue This example also ensures that the BTR and BTW repeatedly alternate The XIO conditions prevent the BTR and BTW from queuing simultaneously The BTS continue as long as the ladder rungs are scanned Configure the BT operation type length and RIO address R G S in decimal at power up Bit N7 50 7 must be set
86. 1 9 Complementary chassis 1 10 Complementary device 5 8 Complementary I O 1 9 1 11 1 12 1 13 1 16 5 5 G 1 Complementary mode 5 3 Configuration DIP switch 2 2 3 1 Configuring complementary I O 1 10 Control buffer layout 7 9 Control file 5 10 Control flag definitions 7 9 Counter instructions 9 17 D Data block counters 6 14 Data Highway Plus switching 8 1 8 4 8 5 Data table transfer time 8 2 Data transfer 1 22 Data transfer control word 4 6 6 5 6 6 G 1 Data transfer handshake word 4 6 6 6 6 8 G 1 Data transfer status word 4 6 Publication 1747 6 22 l ccxvi Index Publication 1747 6 22 6 5 6 7 G 1 definitions G 1 Device fault status 5 14 5 23 Device inhibit 5 13 Device reset 5 13 Device reset words 5 17 DH communication 6 4 DH smart switch 8 4 Diagnostic instructions 9 18 Dip switch settings 1 18 Discrete I O G 1 Discrete I O module G 1 discrete I O throughput with block transfers present example A 7 discrete I O throughput without block transfers present example A 4 Discrete I O transfer 1 4 E Enabled device fault status bit 5 19 Extended node capability 1 9 3 6 A 1 G 2 F FIFO instructions 9 18 File Arithmetic instructions 9 18 File Copy instructions 9 18 File Search instructions 9 18 G G file 5 2 5 5 5 7 5 9 5 21 G 2 editing G file data B 10 H High byte 5 2 7 6 High speed serial link
87. 1 Group 6Word 14 14 Rack 1 Group 7 Word 15 Le 15 Device4 Rack 2 Group OWord 16 16 Rack 2 Group 1 Word 17 17 Rack 2 Group 2Word 18 18 Rack 2 Group 3 Word 19 l e 19 Not Used Rack 2 Group 4Word 20 I e 20 Rack 2 Group 5 Word 21 I e 21 Rack 2 Group 6Word 22 22 Rack 2 Group 7 Word 23 23 Bit Number octal 17 Publication 1747 6 22 16 159 1 amp 1 1 e i h 6 k 3 5 k e slot number of the SLC chassis containing the scanner Transferring Data with RIO Discrete and Block Transfers Input and output image data and command information are quickly exchanged between a scanner and adapter using RIO discrete transfers RIO discrete transfers are the simplest and fastest way a scanner and adapter communicate with each other RIO discrete transfers which are transparent to the user consist of the scanner sending the output image data to the adapter and the adapter transmitting input data to the scanner Each RIO discrete transfer also contains scanner commands for the adapter Through your control program you command the SLC processor to initiate RIO block transfers which directs the scanner to exchange large amounts of data to from an adapter Block Transfers BTs use the basic RIO discrete transfer mechanism of the RIO link However the actual transfer of data occurs asynchronous to the discrete transfers It is possible for several discrete
88. 1747 BSN modules Programming Techniques 9 179 3 For each data block do the following Check whether the block is free to receive new data from the SLC 5 0x Copy the data block from the SLC 5 0x to the 1747 BSN module Advise the 1747 BSN module that the data block is ready through the DTCW set the bit corresponding to the data block in this word 4 Start step 1 in the next program scan To receive the data blocks the secondary SLC 5 0x application program uses the procedure below 1 Read all the DTSWs from the respective 1747 BSN modules 2 Clear all DTHW bits corresponding to the data blocks that were previously read and that no longer have a data ready bit set for them in the DTSWs Send all the DTHWSs to their respective 1747 BSN modules For each data block do the following Check whether the data block is ready in the 1747 BSN module Copy the data block from the 1747 BSN to the SLC 5 0x Advise the 1747 BSN module that the data block was already read through the DTHW set the bit corresponding to the data block in this word 3 Start step 1 in the next program scan The worst scenario with this transfer method is a system with eight 1747 BSN modules in which each one is transferring 16 data blocks The total number of data blocks is 128 In each program scan the system transfers all 128 data blocks Total transfer time is approximately 700 msec Other transfer methods Data transfer
89. 3456 Configuration Dip Switch Settings The six position Configuration DIP Switch is used to select the baud rate configure the communication channel and identify each individual BSN module and the last BSN module The tables below define the DIP switch configuration settings DIP Switch only one module is used in each chassis turn this switch to ON Position Definition Setting 1 and2 Set the communication channel baud rate See the table below DH ON 3 Channel configuration RIO OFF This user identification switch differentiates ped BSN modules in the primary system and BSN modules in the secondary system helping 1 determine if switchover has occurred This switch User selectable is user configurable and will not affect the operation of the module 5 Reserved Identifies the last module in the local status link if 6 multiple BSN modules are used in each chassis If Last module ON All others OFF Baud Rate Settings Position 1 Position 2 Baud Rate ON 57 6K OFF 115 2K OFF ON 230 4K OFF OFF Disabled Module Address Switch Overview 1 35 The four position Module Address DIP switch configures the BSN address in the LSL The following table shows the address that corresponds to each setting Switch Position 1747 BSN Address 1 2 3 OFF OFF OFF 1 ON OFF OFF 2 OFF ON OFF 3 ON ON OFF 4 OFF OFF ON 5 ON OFF ON 6 OFF ON ON
90. 47 BSN are closed and the relays of the secondary 1747 BSN are open Should a failure occur in the primary system the relays of the primary 1747 BSN module open and the relays in the secondary 1747 BSN module close Important The smart switch interface communicates with the secondary processor only when the 1747 BSN module belongs to the secondary system When the module is primary the smart switch only monitors the remote I O link to obtain input output data Switchover Considerations 8 163 The smart switch interface also includes a carrier detect circuit to monitor the activity of the remote I O link The purpose of this circuit is to detect an idle remote I O link before the secondary relays are closed This guarantees that the former primary system was really disconnected from the link and the remote adapters have completed their response to the last poll from the primary scanner In addition in the event of an HSSL break the carrier detect circuit prevents the secondary system from taking control of the link along with the primary system The figure below shows the block diagram of the remote I O switch HSSL link 1747 BSN to primary 1747 BSN Copy of remote I O data including block Smart switch interface Secondary processor transfers T O sca adapt Remote I O link ag j Carrier defect circuit Publication 1747 6 22 8 164 Switchover Considerati
91. 4K Baud 01 00 230 4K Baud 00 Logical Device Starting Address Status M1 Status File Word 8 Bit Number decimal 15 Scanner Configuration and Programming 5 79 Word 8 provides status feedback of the logical device starting addresses you configured in word 1 of the G file primary normal logical devices Writing to M1 file word 8 does not alter the contents of the G file 14 13 12 11 10 9 8 3 O Mt File Primary Logical Device Address Word 8 0 0 1 0 0 0 0 0 0 1 1 0 0 1 Mt e3 G File Word 1 Starting Group Starting Group Starting Group Starting Group 6 4 2 0 2 0 6 4 2 0 4 2 0 Primary Logical Device Address Word 1 0 0 1 0 0 1 0 0 0 0 1 1 0 0 RIO Logical Rack Fj RIO Logical Rack 2 RIO Logical Rack 1 RIO Logical Rack 0 RIO Logical Rack 0 Starting Group 2 Starting Group 2 Starting Group 0 Starting Group 6 Starting Group 0 Word 3 provides status feedback of the logical device starting addresses you configured in word 3 of the G file complementary devices Writing to M1 file word 3 does not alter the contents of the G file M1 Status File Word 3 Bit Number decimal Complementary Logical Device Address Word 3 G File Word 3 Complementary Logical Device Address Word 3 15 14 13 12 11 10 9 M1 File 0 1 0 0 0 0 0
92. 7 ON ON ON 8 Note Switch position 4 is not used Compatible Devices The 1747 BSN is compatible with all Remote I O adapter devices Publication 1747 6 22 1 36 Overview Backup Concepts for the SLC 500 System Publication 1747 6 22 Why Use a Backup System The objective of any redundant system backup system is to improve the amount of up time of a machine or process by ensuring consistent availability of that machine and by reducing costs associated with equipment failure By using this backup system you can guard your application against shutdowns caused by the programmable controller ATTENTION Backup does not protect you from faults caused by programming errors or system timeouts because such an error or timeout also occurs in the secondary processor The backup option is used where you must transfer the control of the process to a secondary system without thereby interrupting the machine process operation To guard against system shutdown a backup system must provide equipment with exceptional reliability automatic fault isolation minimal disturbance of the process when switching from the primary to the secondary system Applying 1747 BSN Backup Scanner Modules to the SLC 500 Programmable Controller A SLC 500 system configured with 1747 BSN modules provides high speed backup communication and switchover of the Data Highway Plus remote I O links and RS232 channel on 5 03 and later processors In t
93. 75ms 45 ms 3 0 ms 9 5 ms 5 5 ms 3 5 ms Example Discrete I O Throughput without Block Transfers Present An SLC 5 03 is controlling an RIO link running at 115 2K baud that has the following adapters One 1747 ASB module is configured as a 1 2 logical rack starting at logical rack 0 I O chassis slot 1 contains 1746 IB16 16 point input module I O chassis slot 2 contains 1746 OB16 16 point output module Two adapters are each configured as full logical racks logical racks 1 and 2 Three adapters are each configured as 1 4 logical racks logical rack 3 Specifications A 189 You need to calculate your Tq 45 the RIO throughput time from when the input closes on the 1746 IN16 until the output on the 1746 OB 16 is on 1 Use the throughput formula to calculate the maximum throughput Tam nbt 2T ps 2T RIO TsNo TsNi Tia Toa Tps 25 0 ms Trio The total RIO scan time ms TsNo See value in the table on page B 13 TSNo without MO File Writes Normal Mode TsNi 5 0 ms Tijg 10 0 ms which is from I O module instruction sheets 1 0 ms which is from I O module instruction sheets Tam nbt 2025 0 2T gio 8 0 TsNo 5 0 10 0 1 0 2 Calculate the total RIO scan time Locate the baud rate 115 2K and adapter size which is found in the table on page B 4 Multiply the RIO scan times listed under the 115 2K heading by the number of each different t
94. 8 The1747 BSN module counts the changes in the local module s significant status and indicates the changes in its Module Status Word The counters show all the errors and status changes since the last power up and cannot be cleared by the user without powering down the chassis Address Counter M1 s 3420 HSSL Error Counter M1 s 3421 LSL Error Counter 1 5 3422 Buffer Full Counter M1 s 3423 Reserved M1 s 3424 RIO Comm Error Counter M1 s 3425 Processor Fault Counter M1 s 3426 Switchover Counter Publication 1747 6 22 6 102 Module Control and Status Word Data Block Counters To help verify the functionality of the data transfer application program the 1747 BSN module has a counter for each data block that can be transferred Each time that a block is transferred from the primary SLC 5 0x to the primary 1747 BSN the data block counter that corresponds to this block is incremented once in the primary 1747 BSN When the secondary SLC 5 0x reads a block from the secondary 1747 BSN the corresponding counter is incremented once in the secondary 1747 BSN Address Data Block Counter 1 5 3430 Block 1 1 5 3431 2 1 5 3432 3 Mt1 s 3433 Block 4 1 5 3434 5 1 5 3435 Block 6 Mt1 s 3436 Block 7 1 5 3437 8 1 5 3438 9 1 5 3439 Block 10 1 5 3440 11 1 5 3441
95. Copy the BTR status area to a binary file which is used throughout the program This avoids addressing the M1 file multiple times during each program scan Each time an instruction containing an M1 file bit word or file is scanned b the processor an immediate data transfer to the module occurs and therefore will impact the overall processor scan time BTR PENDING BTR STATUS B3 TOOB 0 Se COPY FILE 80 Source 1 1 100 Dest B3 0 Length 4 CHECK BTR STATUS B3 A 81 Unlatch the bit that continues to check the BTR status When a BTR is complete the done or error bit is set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done error bit before another BTR to the same M file location can be initiated This is one complete BTR cycle VIRTUAL BTR DONE CHECK BTR BIT STATUS VIRTUAL BTR ERROR BIT RIO Block Transfer 7 137 Rung 2 3 When BTR successfully completes buffer the BTR data and unlatch the BTR enable bit Also unlatch the BTR pending bit and latch the bit that continues checking the BTR status until the SN turns off the done bit VIRTUAL BTR DONE BIT BTR DATA COPY FILE 13 Source M1 1 110 Dest N7 10 Length 64 BTR PENDING B3 VIRTUAL BTR ENABLE BIT CHECK BTR STAT
96. ERROR Publication 1747 6 22 7 144 RIO Block Transfer Rung 2 12 Move the virtual BTW control word to the MO file for the SN module while a BTW is in progress and continue doing so until the enable done and error bits are all turned off completing the hand shake process VIRTUAL BTW BTW ENABLE CONTROL BIT BITS VIRTUAL BTW DONE BIT N7 64 Xu VIRTUAL BTW ERROR BIT N7 64 3565 Rung 2 13 Bidirectional Alternating Block Transfer The following rungs demonstrate a bidirectional alternating block transfer Using these rungs ensures the block transfer requests are executed in the order in which they are sent to the queue This example also ensures that the block transfer read and block transfer write alternate The XIO conditions prevent the BTR and BTW from queueing simultaneously The block transfers continue as long as the XIC precondition bit is true Rung 2 0 Configure the BT operation type length and RIO address R G S in decimal at power up N7 50 7 must be set to a 1 to indicate a BTR and N7 53 7 must be a logical 0 to indicate a BTW operation POWER UP BTR BLET CONTROL Bud TOOB sses SS a Lee mI SS SS SS FILE 15 Source N7 50 1 Dest 1MO 1 100 I 1 Length a
97. Function X from 1 BT buffer 1 for BT buffer 32 Status Flags Refer to the status ne 2 flags table on the following page 1 00 M1 e 100 1 3200 Actual Length Status Number of words that were transferred during 1 5 01 1 101 M1 3201 BT Logical Address Status logical P rack group and slot M1 e x02 M1 e 102 M e 3202 Block Transfer error code Refer to diua the Error Codes table below M1 6 x03 M1 e 103 Mf e 3203 Mt e 104 M1 e 3204 Reserved M Vene through through through Ut M1 e 109 M1 e 3209 Mt e 110 Mf e 3210 BTR Data Locations 0 through 63 M a through through through ne Mt e 173 M1 e 3273 RIO Block Transfer 7 113 Error Code Description 0 The BT completed successfully 6 Illegal BT length requested 7 BT communication error occurred when BT request was initiated 8 Error in BT protocol BT timeout either the SLC user program cancelled the BT or the 9 scanner s BT timer timed out Note that a timeout error occurs if a BT is attempted at a location that is not configured for BT operation e g requesting a BT for a location that is an output module 10 No RIO channel configured Attempted a BT either to a nonconfigured BT Device i e an invalid 11 logical rack group or slot or at a complementary device location where there is no corresponding primary image space allocated 12 Attempted a
98. Group 4 Group 5 Group 6 Group Ao e Understanding M Files Publication 1747 6 22 M Files Overview The scanner provides RIO device control and status information through the MO and M1 files The MO file is a control file The M1 file is a status file There is no image for M file data in SLC processors as there is for I O data The M files are buffers in the BSN module accessible only via ladder logic instructions that address them Each occurrence of a ladder instruction addressed with an M file address is an interrupt to the ladder program scan This is similar to the way Immediate I O Instructions operate Instructions with the MO file addressed write data to the MO file in the BSN Instructions with the M1 file addressed read data from the M1 file in the BSN Scanner Configuration and Programming 5 69 M file bits words in the ladder program therefore impact the ladder scan time If scan time is critical use COP instructions to copy blocks of 1 file data to processor data file addresses throughout the program It is more efficient to do one large M file transfer than to do many small transfers It is also more efficient to address instructions in the ladder program using internal data files binary integer etc Then use COP instructions to copy this data file to the MO file in one large block at the end of the program Refer to the ladder example that follows For more information on M files refer to
99. I O module Complete the following steps to create and monitor the G file 1 Press F9 Specialty I O Configuration A screen similar to the following is displayed 1746 A4 4 SLOT Backplane SPECIAL CONFIG FOR SLOT 1 Maximum Input Words Maximum Output Words Scanned Input Words Scanned Output Words MO Length M1 Length G File Size ISR Number ESC exits Press a function key ISR NUMBER F1 MODIFY ADVNCD GFILE GFILE SETUP SIZE F3 F5 F7 2 Press re71 File Size then specify the number of words required for the specialty I O module 3 Press r3 Modify File The content of G file appears in the display area Data is shown in the default form decimal Publication 1747 6 22 206 1 Files G Files address 0 1 2 3 4 3 6 7 8 9 G1 0 XXXX 0 0 0 0 0 0 0 0 0 G1 10 0 0 0 0 0 0 The function keys appearing below the data table indicate the three data formats available to you binary data decimal data and hex bcd data BINARY DECIMAL HEX BCD DATA DATA DATA F1 F2 F3 The following figure illustrates the three G file data formats that you can select Word addresses begin with the file identifier G and the slot number you have assigned to the specialty I O module In this case the slot number is 1 Sixteen words have been created addresses G1 0 through G1 15 16 word G fil
100. I O network in a listen mode Outputs are only controlled by the primary processor The three words used to accomplish data transfer over the HSSL are 1 0 3410 Data Transfer Control Word DTCW This word is used by the primary processor to initiate the transfer of data to the primary BSN This data is ultimately transferred to the secondary BSN over the HSSL then to the secondary processor 2 M1 s 3410 Data Transfer Status Word DTSW This word is used in both the primary system and the secondary system to affect the transfer of data on the HSSL Publication 1747 6 22 6 94 Module Control and Status Word Data Transfer Control Word Publication 1747 6 22 Primary System The word must be monitored by the primary processor because this word is used by the primary BSN to acknowledge that the BSN has received the data block from the processor and is ready for the next transfer for that particular data block number Secondary System The word is used by the BSN to let the processor know that a new data block is ready for transfer from the secondary BSN to the secondary processor The ladder program in the secondary processor must monitor the bits in this word to know when to copy new HSSL data from the BSN to the processor data table 3 MO0 s 3411 Data Transfer Handshake Word DTHW This word is used by the secondary processor to inform the secondary BSN that it has received the latest data block and is ready for t
101. M1 1 3884 Dest N13 128 Length 128 Virtual DTHW Bit for Data Block 4 B3 4 3 Publication 1747 6 22 9 168 0005 0006 0007 0008 Programming Techniques This rung copies the new Data Block 5 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 5 B3 4 4 M0 1 3411 4 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 5 Virtual DTSW Bit for Data Block 5 B3 3 COP jE Copy File 4 Source 1 1 4012 Dest N14 0 Length 128 Virtual DTHW Bit for Data Block 5 B3 4 gt 4 This rung copies the new Data Block 6 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 6 B3 4 5 M0 1 3411 5 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 6 Virtual DTSW Bit for Data Block 6 B3 3 COP J F Copy File 5 Source M1 1 4140 Dest N14 128 Length 128 Virtual DTHW Bit fo Data Block 6 B3 CY S 5 This rung copies the new Data Block 7 data from the secondary BSN to a file within the secondary processor When the
102. Mode Change Sequencing 4 7 Fail over Sequencing 4 8 Power Down Sequencing 4 8 Restarting a failed system 4 8 Scanner Configuration and Programming Module Control and Status Word Table of Contents vii Chapter 5 Understanding Remote Input and Output Image Files 5 1 RIO Configuration Using G Files Le 5 2 Rules for Configuring the 5 5 General Liao Doa bts 5 5 Concerning Complementary I O 5 5 Considerations When Configuring Remote I O 5 9 G File Considerations 5 9 Crossing Logical Rack Boundaries 5 9 Examples of Crossing Logical Rack Boundaries 5 9 Understanding M Files 5 10 M Files 5 10 Control File 5 13 MO File RIO Device Inhibit Control 5 14 File RIO Device Reset Control 5 15 MO File Remote Output Reset Control 5 16 Device Reset and Remote Output Reset Considerations From this mode 5 17 M1 Status File Description 5 19 General Communication Status Enable Device Fa lt Bita e Ehud eh eau Piet bia ct M iai 5 19 General Communication Status Communicatio
103. O Link Specifications 1 9 Extended Node Capability 1 9 Complementary 1 9 Guidelines for Configuring Complementary 1 10 Complementary 1 0 Placing Modules with 2 Slot Addressing 1 11 Complementary 1 0 Placing Modules with 1 Slot Addressing 1 12 Complementary 1 0 Placing Modules with 1 2 Slot Addressing Enna at ah 1 13 Summary for Placing Modules Used In Complementary 1 13 Discrete Modules 1 13 Block Transfer Modules 1 14 Complementary I O Application Considerations 1 16 Complementary 1771 I O Module Details 1 16 Hardware Features 1 17 Stat s LEDS t We tod 1 17 Configuration Dip Switch 1 18 Module Address Switch 1 19 Compatible Devices 1 19 Backup Concepts for the SLC 500 System 1 20 Why Use a Backup System 1 20 Applying 1747 BSN Backup Scanner Modules to the SLC 500 Programmable Controller 1 20 A Typical SLC 500 Backup Configuration 1 21 Publication 1747 6 22 vi Table of Contents Quick Start for Experienced Users Installation and Wiring Operating Your SLC 500 Backu
104. Overview Communication between devices occurs over twisted pair cable with the devices daisy chained together The scanner can reside in any slot of the local SLC chassis except for slot 0 The 1747 BSN includes the same functionality as the 1747 SN scanner as well as the backup features SLC 5 02 or RIO Scanner Master later Processor of the RIO Llink Local SLC Chassis The scanner transfers input and output data between _ itself and all configured network devices over twisted pair cable Note that the end to end length of the cable can be a maximum of 3 048 meters 10 000 feet 1747 ASB Module Adapter Slave eum cB ESE ES RR T o Remote Chassis Remote Expansion Chassis pee E summ 6 Dataliner Message Displa PanelView Operator Terminal RediPANEL Adapter Slave did Adapter Slave Adapter Slave SLC 5 02 or Later Processor RIO Scanner The scanner can be configured for and transfer a maximum of 4 logical racks of discrete data on the RIO link The scanner provides discrete I O and block transfers Configurations allowed are any combination of quarter half three quarter or full logical rack devices The scanner transfers discrete input and out
105. PENDING B3 L Move the virtual BTR control word to the MO file for the BSN module while a BTR is in progress and continue doing so until the enable done and error bits are all turned off completing the handshake process BTR CONTROL WORD Rung 2 11 RIO Block Transfer Move the virtual BTW control word to the MO file for the BSN module while a BTR is in progress and continue doing so until the enable done and erroer bits are all turned off completing the handshake process VIRTUAL BTW ENABLE VIRTUAL BTW DONE VIRTUAL BTW ERROR BIT BTW CONTROL WORD Source N7 53 0 Dest M0 1 200 7 155 Publication 1747 6 22 7 156 RIO Block Transfer Publication 1747 6 22 Timing Requirements Chapter 8 Switchover Considerations When planning programs for the SLC 500 backup system you must first consider that the program scans of the two processors are not synchronized This means that the program in the primary processor is not executing the exact same instruction at the same time as the program in the secondary processor In addition you must consider timing divergence e I O forces Data Highway Plus switching remote I O switching special sections of the data table data integrity This chapter describes the switchover considerations listed above as well as switchover diagnostic It also describes how to detect a possible fault in the s
106. Primary Chassis Complementary Chassis Logical Rack Number Logical Rack Number Decimal Octal 0 8 10g 1 9 11g 2 10 12 3 11 138 ATTENTION If the logical rack numbers are not properly assigned unpredictable operation of both ASB modules results No ASB module errors occur Refer to your ASB module user manual for specific information on setting the address of the complementary chassis For example in the 1771 ASB manual the addresses for the complementary chassis are referred to as complementary chassis 0 3 Guidelines for Configuring Complementary I O When you configure your remote system for complementary I O follow these guidelines Youcan place an output module in the primary chassis opposite another output module in the complementary chassis they use the same bits in the output image table However we do not recommend this placement of modules for redundant I O Youcannot use complementary I O with a chassis that uses 32 point I O modules and 1 slot addressing or 16 point I O modules with 2 slot addressing Do not place an input module in the primary chassis opposite an input module in the complementary chassis because they use the same bits in the input image table Overview 1 27 Complementary 1 0 Placing Modules with 2 Slot Addressing The figures below illustrate a possible module placement to configure complementary I O using 2 slot addressing MEM MSN MEUSE o 8 8 8 8 16 16 8 8 o 8 BT 8 l
107. Rack Device Full Logical Rack Device Half Logical Rack Device Three Quarter Logical Rack Device Rules for Configuring the Scanner Scanner Configuration and Programming 5 63 General The smallest portion of the scanner s I O image that can be allocated to a single RIO device is two logical groups 1 4 logical rack If a device is configured in word 1 there must be image allocated to it in word 2 This rule also applies to words 3 and 4 with the following exception if word 3 1 and word 4 0 the complementary mode is selected even though no complementary devices are configured A logical device s starting group must begin at even group numbers 0 2 4 or 6 Each bit in words 2 and 4 represent an even logical group number Concerning Complementary I O It is valid for you to have a complementary device configured even if no associated primary device exists Also complementary devices do not have to be the same logical image size as the primary device G file words 1 and 2 can both be zero no primary devices However in this case there must be at least one complementary device configured in G file words 3 and 4 If there is at least one primary device configured in G file words 1 and 2 then words 3 and 4 can both be zero or the G file size can be set to 3 complementary mode not selected The starting group of the primary and complementary chassis should be the same if they share the same image space If the
108. SW Bit Virtual MSW Bit Virtual MSW Bit when 1 the Local when 1 indicates when 1 indicates System is in the the Local System is the Remote System is Primary Mode in the Primary Mode in the Primary Mode B3 1 B32 B32 JSR 0002 lE J E yt Jump To Subroutine 6 6 14 SBR File Number U4 0003 CEND Publication 1747 6 22 6 98 Module Control and Status Word Program File 3 The following rungs are meant to be executed only when this processor BSN is in the Backup Mode When it is acting as the Backup Processor this rung copies the DTSW Data Table Status Word to an internal storage word within the SLC processor B3 3 in this example Virtual amp Actual DTSW Words MOV 0000 Move Source M1 1 3410 I lt Dest B3 3 0000000000000000 lt This rung copies the new Data Block 1 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 1 B3 4 0 M0 1 3411 0 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 1 Virtual DTSW Bit for Data Block 1 B3 3 COP 0001 jE Copy File 0 Source 4M1 1 3500 Dest N12 0 Length 128 Virtual DTHW Bit for Data Block 1 B3 4 p 0 This rung copies the new Data Block 2 data from the secondary BSN to a file within
109. Starting Group Starting Group 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 1 1 1 0 0 1 1 0 1 1 1 1 1 0 0 1 15 14 9 8 7 6 3 2 1 0 File x x x x x x x x x 0 1 1 0 Mo e 8 X x x S x x x x x 0 0 0 0 M0 e 9 x x x x x x x x x 1 0 0 1 0 10 x x x x x x x 0 0 0 1 M0 e 11 e slot number of the SLC rack containing the scanner X not used defined MO File RIO Device Reset Control Scanner Configuration and Programming 5 73 Words 16 through 19 you use these words to command a reset 0 of RIO device outputs when the SLC processor is in Run or Test mode This allows you to selectively reset logical device outputs based on a previous condition s that you defined Bits 0 3 correspond to the logical I O group locations within logical racks 0 1 2 and 3 To command an RIO device to a reset 0 condition from Run or Test mode set the bit corresponding to the starting logical address of the device to 1 Setting bits that do not correspond to a device starting address does not force a reset To remove the reset condition reset the bit corresponding to the device logical starting address to 0 Refer to the mode table below Default The SLC processor resets all bits in this field to 0 when it enters Run or Test mode MO Control File Words 16 through 19 Logical Rack 0 Device Inhibit Word 16 Logica
110. Startup Sequencing When the system is powered up for the first time the following sequence must be followed 1 Disconnect both the primary and secondary SLC 5 0x from DH or DH485 2 Download programs containing the desired DH or DH485 node address to each processor Leave both SLC 5 0x in program mode and power down both systems 3 Apply power to the system that is intended to be primary 4 Apply power to the system that is intended to be secondary 5 Change the primary SLC processor to Run mode 6 Change the secondary SLC processor to Run mode To determine the primary and secondary systems use the following powerup sequence 1 Apply power to the system that is intended to be primary 2 After the primary SLC 5 0x has been powered up and is operating correctly apply power to the system that is intended to be secondary If both systems are powered up at the same time they use a talk and listen algorithm to determine which system is going to be primary and which is going to be secondary The RIO and DH relays remain open until only one of the systems assumes primary status This ensures that only one of the SLC 5 0x processors takes control over the RIO and DH links The 1747 BSN does not control the operating mode of the SLC 5 0x in either the primary or the backup systems If a processor mode change is required it should be done primarily in the secondary system After that if required the processor mode c
111. This is dependent on the SLC processor you are using 2 Refer to the equations that follow Publication 1747 6 22 Specifications A 195 Backup Scanner Output Delay Time Tsyo Tables The tables provided in this section show the maximum backup scanner output delay time Tsy for specific applications is dependent on the following processor scan time or time between immediate outputs if no BTs are present number of logical racks configured whether normal or complementary I O mode is selected RIO baud rate if complementary I O is selected Variable Variable Description T The maximum scanner output SNo delay time The time between SLC processor output scan updates or immediate output updates constant time threshold that T is dependent on your hold configuration Refer to the table on page B 12 Tsnpo increases if the interval between decreases to the time threshold Thold If Tupd is less than Thold then the larger TSNo number must be used Otherwise either number may be used Important The times shown in this section are to the best of our knowledge the maximum delay times of the backup scanner However in instances that throughput is an important consideration test the application thoroughly first to ensure proper operation Note that in most situations the average throughput is much better than the calculated maximum throughput Determining the Number
112. US Rung 2 4 VIRTUAL BTR ERROR BIT BTR PENDING B3 VIRTUAL BTR ENABLE BIT CHECK BTR STATUS B3 Publication 1747 6 22 7 138 RIO Block Transfer Rung 2 5 Initiate a BTR for each false to true transition of the user input USER LOGIC INITIATE A BTR I 2 B3 B3 OBR Jasna csi ean a aaa eee 0 0 82 83 Rung 2 6 When user logic initiates a new BTR latch the enable bit as long as a BTR is not in progress Also latch the BTR pending bit so the BTR status file will be read by the ladder program VIRTUAL VIRTUAL VIRTUAL BTR ENABLE BTR DONE BTR ERROR BTR BIT BIT BIT PENDING B3 B3 B3 B3 B3 ee IF eee I Ue aie it etait 83 1615 13 12 80 VIRTUAL BTR ENABLE BIT B3 L 1615 B3 U 83 Rung 2 7 Move the virual control word to the MO file for the SN module while a BTR is in progress and continue doing so until the enable done and error bits are all turned off completing the BTR handshake process VIRTUAL BTR BTR ENABLE CONTROL BIT WORD B3 MOV 4 4 MOVE 1615 Source B3 100 0000000000000000 Dest M0 1 100 4R VIRTUAL BTR DONE BIT B3 4 13 VIRTUAL BTR ERROR BIT B3 12 END4
113. When going from Run to Program mode if both of the appropriate bits in the Device Reset and Remote Output Reset words are reset to 0 before leaving Run mode the RIO link device is instructed to decide whether to hold its last output state or to reset its outputs To this mode Test Default values are set automatically Outputs reflect those of the scanner output image DR 0 Outputs are unchanged 0 state switch setting is IDR 1 Outputs are turned OFF valid 1 These two combinations reset device outputs DR 1 ROR X DR 0 DR 0 In this instance the last ROR 1 ROR 0 state switch setting is Default values are set valid automatically Once these outputs are reset they remain reset regardless of the DR and ROR settings Outputs reflect those of the scanner output image DR X ROR 1 These two combinations reset device Program In this instance the last 0 state switch setting is valid 1 These two combinations reset device outputs ROR X Outputs remained unchanged outputs DR 1 ROR X DR 0 DR 0 1 ROR 1 Default values are set These default values are set automatically Outputs reflect automatically Outputs are reset those of the scanner output image unless ROR 1s changed to 0 on the first scan Publication 1747 6 22 Scanner Configuration and Programming 5 77 M1 Status File MI file words 0 through 47 contain th
114. Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15 Word 16 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23 Word 24 Word 25 Word 26 Word 27 Word 28 Word 29 Word 30 Word 31 Chapter 5 Scanner Configuration and Programming This chapter contains information necessary to understand remote I O image files understand RIO configuration using G files control and view RIO devices using the MO and MI files understand slot addressing quickly configure the RIO Scanner The SLC system allows you to assign up to 32 words of input and output image data to a scanner This allows your scanner to access a maximum of four full logical racks 512 input and output points of data from remote devices The illustration below shows how logical racks logical groups and words are allocated within the I O image files Note that this illustration describes the input image file The scanner s output image file is the same except that its addressing scheme starts with O e O and ends with O e 31 0 31 173 163 183 148 13g 125 11g 103 73 63 539 49 339 258 1 Publication 1747 6 22 5 60 Scanner Configuration and Programming Publication 1747 6 22 The 1747 BSN module s I O image structure is described below The I O image file consists of four logical ra
115. age instructions When programming you must ensure that when a switchover occurs that any messages which were running in the primary processor are subsequently enabled in the secondary processor You can do this by conditioning message instruction rungs in both the primary and secondary processors using the primary secondary bit of the 1747 BSN status word If necessary you can pass the results of a message addressed to the primary processor over the HSSL to the secondary processor PRI SEC Message Publication 1747 6 22 9 184 Programming Techniques Summary of Programming Considerations Publication 1747 6 22 PID Control Files When using PID instructions you can send all or part of these control files based on how you back up your PID instructions and the total amount of data to be sent by the BSN modules Keep in mind that the control files contain such things as your setpoint gains and words that are used by the PID instruction for internal storage and should not be manipulated unnecessarily When developing a program for the SLC 500 backup system you must always consider the following non synchronous I O scans execution times of block transfer instructions time for transfer of data from the primary to the secondary processor the need to reduce the quantity of data to be transferred and gathering all related data into a single block synchronization of discrete I O data with re
116. ained in earlier chapters of this manual Topics include MO M1 Files G Files and 1 files are data files that reside in specialty I O modules only There is no image for these files in the processor memory The application of these files depends on the function of the particular specialty I O module With respect to the SLC processor SLC 5 02 or later the MO file is a module output file a write only file and the 1 file is a module input file a read only file The opposite is true for specialty I O modules where the file is a read only file and the M1 file is a write only file and 1 files can be addressed in your ladder program and they can also be acted upon by the specialty I O module independent of the processor scan It is important that you keep the following in mind in creating and applying your ladder logic Important During the processor scan the ladder program can address MO and 1 data with bit word or file instructions Each time an MO M1 file address is encountered in the program an immediate data transfer to or from the specialty I O module occurs The impact these immediate data transfers have on processor scan time is described in appendix D of the SLC 500 and MicroLogix 1000 Instruction Set Reference Manual Publication 1747 6 15 Configuring MO M1 Files MO and MI files are configured as part of the I O configuration procedure for the processor file After you have assigned the sp
117. al Group Starting Logical Group Logical Group ogical Group Device Address 6 4 2 0 6 4 2 0 6 4 2 4 2 0 Word 3 o o oe oe o o T To o o o o RIO Rack 11 RIO Rack 10 RIO Rack 9 RIO Rack 8 mage Size Image Size Image Size mage Size oo Logical 6 4 2 6 4 2 o 6 4 2 0 6 4 2 0 Word 4 0 1 1 0 0 0 0 1 1 0 1 1 1 1 1 0 Illegal Configuration Examples Having a primary device configured at Logical Rack 1 Logical Group 2 bit 5 would be illegal since this image space is already being used by a complementary device Having a complementary device configured at Logical Rack 10 Logical Group 2 bit 9 would also be illegal since this image space is already being used by a primary device Logical Rack 0 Logical Rack 1 Logical Rack 2 Logical Rack 3 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15 Word 16 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23 Word 24 Word 25 Word 26 Word 27 Word 28 Word 29 Word 30 Word 31 Scanner Configuration and Programming 5 65 Note that the complementary device at Logical Rack 8 Logical Group 2 could be an ASB using 10 words 1 1 4 logical racks of data and thereby cross into RIO Logical Rack 9 The G file configuration above would provide the primary and complementary input images to the scanner which are illustrated on the foll
118. am cancels a BT that has been pending EW 1 ST 0 for a specific amount of time l When the SLC control program detects that the EW has set a timer in the SLC control program starts If the timer expires before the scanner begins transmitting across the RIO link ST 1 then the SLC control program sets the TO flag Note that the cancellation will not occur until all previously scheduled to the same logical rack have been completed i e when the ST bit would normally have been set The scanner fills in the error code field and sets the ER flag Also the ER bit is not set until any previously pending BTs to that device have been completed The SLC control program must clear the EN flag to complete the BT operation Note that because of the asynchronous nature of cancelling a device that has a BT in progress the BT reply may indicate either a successful completion or an error The SLC control program clears the TO and EN flags Note that if the SLC control program later attempts to initiate another BT and the TO flag is still set the scanner will ignore the BT request Finally the EW ST if set and ER bits are reset Primary I O Image Bit Number Octal 17 10 7 Bit Number Decimal 15 87 Logical Rack 0 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 0 0 RIO Block Transfer 7 121 Below are points to consider when implementing BT operations The minimum amount of scanner imag
119. and M file descriptions Chapter 5 Information on module control and status word Chapter 6 RIO block transfer information M file block transfer buffer layout block transfer examples Chapter 7 Switchover considerations Chapter 8 Programming techniques Chapter 9 Backup scanner and system specifications Appendix A Information and usage of M and G files Appendix B Worksheets for configuring the scanner s I O image Appendix C Definitions of terms used in this manual Glossary Publication 1747 6 22 14 Related Documentation The table below provides a listing of publications that contain important information about Allen Bradley SLC products For Read this document Document number An overview of the SLC 500 family of products SLC 500 System Overview 1747 2 30 ia Installation amp Operation Manual for A description on how to install and use your Modular SLC 500 Modular Hardware Style Programmable 1747 62 programmable controller Controllers A reference manual that contains status file data and instruction set SLC 500 and MicroLogix 1000 1747 6 15 information for the SLC 500 processors Instruction Set Reference Manual Installation guide for the Backup Scanner Module Backup Scanner Module Installation 1747 5 38 Instructions An article on wire sizes and types for grounding electrical equipment National Electrical Code Published by the National Fire Protection Association of Boston MA A complete l
120. appendix B You can find M file information relating to Block Transfer operations in chapter 7 RIO Block Transfer Publication 1747 6 22 5 70 Scanner Configuration and Programming Rung 2 0 To decrease program scan time copy the first four words of the M1 file to a binary file and use these addresses throughout the program to access block transfer done error data etc information without interrupting the program scan many times tt t t t t t t t COPY FILE Source M1 1 100 Dest B3 0 Length 4 Rung 2 1 Examine B3 13 B3 0 13 an internal storage bit to determine when a block transfer is done Note that examining multiple individual M file bits directly every scan can measurably increase processor scan time BT DON J B3 FILE i 13 Source M1 1 110 Dest N10 0 Length 64 Rung 2 2 Examine B3 12 an internal storage bit to determine if a BT error occurred Buffer the BT status from B3 3 if an error does occur B3 12 Source B3T3 0000000000000000 Dest N10 64 0 2 3
121. ata Table handshake Word bit for Data Block 2 B3 4 1 0 1 3411 1 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 2 Virtual DTSW Bit for Data Block 2 B3 3 COP 4b Copy File 1 Source M1 1 3628 Dest N12 128 Length 128 Virtual DTHW Bit for Data Block 2 B3 4 C 2 1 This rung copies the new Data Block 3 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 3 B3 4 2 0 1 3411 2 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 3 Virtual DTSW Bit for Data Block 3 B3 3 COP J E Copy File 2 Source M1 1 3756 Dest N13 0 Length 128 Virtual DTHW Bit for Data Block 3 B3 4 X 2 This rung copies the new Data Block 4 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 4 B3 4 3 M0 1 341 1 3 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 4 Virtual DTSW Bit for Data Block 4 B3 3 COP 4 Copy File 3 Source
122. ata and use it to emulate the 1747 SN functionality to the secondary SLC 5 0x In the secondary system the 1747 BSN simulates the entire scanner operation to the secondary SLC 5 04 with the following characteristics Real discrete input data is acquired by the secondary BSN from the RIO network and transferred to the secondary SLC 5 04 through the input I file Real BTR input data is acquired by the secondary BSN from the RIO network and transferred to the secondary SLC 5 04 through the MI file All the timing necessary for doing a BTR command in the SLC 5 04 is simulated by the secondary BSN The discrete output data sent by the secondary SLC 5 04 through the output O file is stored in the output image table for using in case of a switchover The BTW output data sent by the secondary SLC 5 04 through the MO file is stored into the secondary BSN and all the timing for the BTW operation is simulated by the secondary BSN n case of RIO communication errors seen by the BSN in the primary system remote rack errors BTR or BTW errors etc the secondary BSN simulates the same errors for the secondary SLC 5 04 This simulation is done in order to assure that the secondary SLC 5 04 knows the real status of the remote devices e Ifa switchover occurs all the input and output data inside the BSN is ready for the operation as the new primary scanner When the backup system is operating properly the relays of the primary 17
123. ating More than One Logical Rack Device RIO discrete transfers occur on a logical device basis not on an adapter basis A logical device is any portion of a logical rack that is assigned to a single adapter When the scanner image assigned to an adapter is more than one logical device the scanner sees the single physical device as multiple logical devices on the RIO link The scanner communicates with each logical device independently even if the logical devices are all assigned to one adapter If a physical device image is more than one logical device the following is true The scanner does not update all of the adapter image at the same time The number of logical devices determines the number of RIO discrete transfers that are needed to update the entire adapter image The adapter may receive different communication commands for each logical device In this case the adapter decides which command it responds to Scanner Input or Output Image 15 87 0 In this example the adapter is Group 0 configured to start at Logical Rack 0 Group 1 Logical Group 0 and uses 14 words Logical Grab 3 Logical of I O image Note that two RIO Rack 0 Group 4 Device discrete transfers are required for C Adapter the scanner to update the adapter Group 7 Image ini i Group 0 7 containing two logical Groun 1 devices Logical Group Logical Rack 1 Group 3 Device
124. ation Attempted Bit Word 0 bit 1 is the Communications Attempted status bit When RIO communication has been attempted with all configured devices this bit is set to 1 There are no further transitions of this bit until a processor change of state occurs i e Program mode to Run mode or Test mode or Test mode to Run mode Until this bit is set all devices in 1 file word 10 active device status appear to be inactive This bit can be used to condition the Enabled Device Fault bit If the Communications Attempted bit is 1 the Enabled Device Fault bit is valid M1 Status File Word 0 Bit Number decimal General Communication Status Word Word 0 RIO Baud Rate Status 15 14 13 12 1 10 9 7 6 5 4 3 2 1 0 Mie x x x x x x x x x x x x x x 1 1 Mt e 0 Communications Enable Device Attempted Status Bit Fault Bit Word 2 bits 0 to 1 displays the RIO communication baud rate you have set the scanner to via its DIP switch Writing to word 2 does not change the scanner baud rate M1 Status File Word 2 Bit Number decimal RIO Baud Rate Word 2 Publication 1747 6 22 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 0 1 Baud Rate As illustrated by the table below bit 0 SW1 and bit 1 SW2 Bit 1 0 Baud Rate SW 1 2 MH M 01 115 2K Baud 10 10 230
125. bit you can transfer the state to an internal processor bit This is illustrated below where an internal processor bit is used to indicate the true false state of a rung EQU M0 3 0 E EQUAL 0 Source A N7 12 1 Source B N7 3 This rung will not show its true rung state because the EQU instruction is always shown as true and the instruction is always shown as false EQU B3 E E EQUAL 0 Source A N7 12 2 Source B N7 3 aa 0 1 OTE instruction B3 2 has been added to the rung This instruction shows the true or false state of the rung Publication 1747 6 22 200 1 Files G Files Publication 1747 6 22 15 Source B3 0 Dest M0 1 0 Length 16 First scan bit It makes this rung true only for COP the first sean after 1 COPY FILE entering Run mode 9 Source N7 0 Dest M0 1 16 Length 27 MO M1 Monitoring Option Enabled Important This option is not supported by the SLC 5 02 processor The SLC 5 03 and SLC 5 04 processors allows you to monitor the actual state of each addressed MO M1 address or data table The highlighting appears normal when compared to the other processor data files The processor s performance will be degraded to the degree of MO MI referenced screen data For example if your screen has only one MO MI element degradation is minimal If your screen has 69 MO M1 elements degradation is si
126. canner s input and Ort 1 i 4 Word 4 output image file The one byte can Groups Word 5 E come from either the low byte Wee f rou or hs Words Logical Slot 0 or the high byte Group 1 Word 9 7 Logical Slot 1 Logical Slot 1 only Group 7 Word23 applies for 2 slot addressing Group 0 Word 24 Logical Group 1 Word 25 siia aoe 3 Word 26 In this example there are two block Group 4 Word 28 lt transfer operations mapped to the Group 5 Word 29 1 Group 6 Word 30 scanner s I O image One BT pape Word 31 Ak Ak X k operation is mapped to Logical Rack 0 i Logical Slot 0 Logical Group 4 Logical Slot 1 The other is mapped to Logical Rack 3 MEME Logical Slot 1 Logical Group 4 Logical Slot 0 Note that the logical address of you RIO devices i e adapter and intelligent I O modules determine where the block transfer gets mapped Publication 1747 6 22 RIO Block Transfer 7 109 Example 2 In this example the remote adapter is configured for 2 slot addressing It is assigned 1 4 logical rack or the scanner s I O image files starting at RIO Logical Rack 3 Logical Group 4 The remote adapter controls four analog modules that are configured for block transfer operations Note that each module uses both the input and output byte of the logical slot to which it is assigned 1747 SN RIO Scanner s I O Image Files Input Image Output Image Group 0 Word 0 a ue
127. canner image assigned to an adapter is less than 8 logical groups it too can cross a logical rack boundary depending upon the starting logical group number The significance of crossing logical rack boundaries is discussed in the next section Examples of Crossing Logical Rack Boundaries Examples 1 and 2 that follow show adapters with logical image sizes that cross logical racks 0 and 1 The image size of the adapter in example 1 consumes all of logical rack 0 eight logical groups and half of logical rack 1 four logical groups The image size of the adapter in example 2 consumes two groups in logical rack 0 and four groups in logical rack 1 Crossing Logical Rack Boundries Example 1 Crossing Logical Rack Boundries Example 2 Scanner Input r Output Image Scanner Input or Output Image 15 15 87 0 Group 0 Group 0 Logical eens Groupi ogica roup Logical Group 3 Group 3 Rack0 0 Group 4 Group 5 Adapter Group 5 Group 6 Image Group 6 Group 7 Group 7 Group 0 Group 0 Adapter Logical Group 1 Group 1 Image Racki Logical Group 2 ro Group 4 Rack 1 Group 4 Group 5 Group 5 Group 6 Group 6 Group Gou Adapter image is 12 logical groups in size and crosses a Adapter image is 6 logical groups in size and crosses a logical rack logical rack boundary due to its size boundary due to its starting logical group number Publication 1747 6 22 5 68 Scanner Configuration and Programming Cre
128. cessor to track the accumulated value in the primary processor Counter Instructions Counter instructions are similar in structure to timer instructions However when a switchover occurs a counter that occurs once in a program could increment or decrement twice in one program scan This problem arises when the following sequence of events occur 1 The primary system executes a counter up down instruction conditioned by a rung transition of not true to true This increments decrements the counter accumulated value 2 The 1747 BSN modules transfer this data into the counter file of the backup processor before the secondary s input image table is updated with the input transition information 3 The backup processor updates its input image table 4 The processor in the secondary system which was at a different point in its program scan executes the counter instruction again thus incrementing decrementing the counter again Publication 1747 6 22 9 182 Programming Techniques Publication 1747 6 22 Programming Techniques As with the timer instruction your program should transfer the counter accumulated value from the primary to the secondary processor at least once after you start the backup system switch the secondary SLC 500 from PROGRAM to RUN mode restart a repaired system This allows the accumulated value in the secondary processor to track the accumulated value in the primary processor Diagnostic Se
129. chronous to RIO link discrete transfers Note that block transfers occur as RIO scan time allows discrete I O transfers have first priority A total of 32 block transfer control status buffers exist in the MO output control and the M1 input status files Block transfer buffers consist of 3 BT control words in an MO file BT buffer 4 BT status words in an 1 file BT buffer 64 words of BTW data in an MO file and 64 words of BTR data in an 1 file Refer to the diagrams on the following pages Control Buffers 1 32 You use an MO file BT control Mo e 100 Mo e 3200 buffer to initiate a BT The PH corresponding M1 file displays the status of the block transfer Words Words control and 7 100 109 control and 7 3200 3209 reserved reserved BT buffers reside on 100 word boundaries in the MO MI files starting at word 100 For Words 64 words for BT TUUS 64 words for BT example BT buffer 1 resides at 110 173 Write Data Write Data MO e 100 and M1 e 100 BT buffer 2 resides at 0 200 and M1 e 200 while BT buffer 16 resides at M0 e 1600 and M1 Status Buffers 1 32 1 1600 that the e in these examples refers to the M1 e 100 M1 6 3200 physical chassis slot number in CLIE CE gt which the scanner resides 4 words for Words A words Tor Words as ande All block transfer buffers MO 100 109 Status and 6 3200 3209 reserved i r
130. ck 7 20 Quick Reference to Status and Control Bits 7 20 St t s BIS pent aon 7 20 Control BIS kossa sr das d etas dh 7 21 Block Transfer Read Control Logic Example 7 21 Directional Continuous Block Transfer Example 7 27 Directional Repeating Block Transfer Example 7 31 Publication 1747 6 22 Switchover Considerations Programming Techniques Table of Contents Directional Non Continuous Block Transfer Example ss Seaver acta eaves 7 34 Bidirectional Continuous Block Transfer Example 7 37 Bidirectional Alternating Block Transfer 7 42 Bidirectional Alternating Repeating Block Transfer 7 48 Chapter 8 Timing 8 1 Input Signal Update Time 8 2 Time out on Remote I O Link 8 2 Data Table Transfer Time on HSSL 8 2 son S Pe Hr PORE 8 3 uS ope Oar Pubs col Dot tela de cis 8 3 Data Highway Plus Switching 8 4 Remote I O Switching 8 6 Chapter 9 Chapter Objectives 9 1 Getting 5 9 1 Programi PUG 2264 2 Eo t 9 2 Program File 3 9 3 Program File 4 9 8
131. ck 1 Publication 1747 6 22 192 Specifications Publication 1747 6 22 Adapter 2 1771 ASB module starting logical rack 2 logical group 0 e 2 logical groups 1 4 logical rack one 64 word BT write read module Adapter 3 1771 ASB module 1 e starting logical rack 2 logical group 2 e 2 logical groups 1 4 logical rack one 32 word BT write read module Use the throughput formula to calculate the maximum throughput of the 1747 ASB module 2T ps 2T RIO 2 Tia TsNo bt Tsni Tia Toa Tps 25 0 ms which is from the APS reference manual assume for example Trio The total RIO scan time ms Additional time due to sending any BT data on the RIO link Two 1747 ASB module backplane scan times calculated from ASB manual 2 4 5 9 0 ms TsNo bt 22 0 ms from the table on page B 13 TSNo with Block Transfers Normal Mode There are 3 logical racks configured Toni 5 0 ms Tja 10 0 ms which is from I O module instruction sheets 1 0 ms which is from I O module instruction sheets Tam bt 2 25 0 2Tgjo 2Ty 9 0 22 0 5 0 10 0 1 0 Calculate the total RIO scan time Tpgjo Locate the baud rate 115 2K and adapter size which is found in the table on page B 4 Multiply the RIO scan times listed under the 115 2K heading by the number of each different type of rack that you have Add those number together Trio Tadapterl
132. cks numbered 0 1 2 and 3 of input image and four logical racks of output image Each logical rack consists of eight logical groups numbered 0 1 2 3 4 5 6 and 7 Each logical group consists of two words an input word and an output word Each word consists of two bytes a high and a low byte Low byte is bits 0 7 and high byte is bits 8 15 Each byte consists of eight bits with each bit having the ability to control one discrete I O point RIO Configuration Using G Files When you program your SLC system use the G file to configure the scanner s I O image file The Backup Scanner s G file configuration is based on the devices that you have on the RIO link G file configuration consists of setting logical device starting addresses and the logical device image size of each physical device adapter with which the scanner communicates You enter G file configuration information using programming software See M0 MI Files and G Files on page B 1 for further details Neither your application program nor your programming device can access or alter the G file while on line with the processor To change the G file you must go off line into the program file make any necessary changes and download the program containing the altered configuration The G file consists of five words which are described below Word 0 contains scanner information for the SLC processor Your programming device automatically sets up Word
133. ction copies the information into the MO output control file 2 Your SLC control program initiates a BTR BTW operation by filling in the BT control field M0 e 100 7 of the MO BT buffer This indicates whether a BTR or BTW is initiated 0 BTW and 1 BTR Your SLC control program also sets the EN Enable flag M0 e 100 15 which signals the RIO scanner that a new block transfer operation is to begin 3 The scanner processes the BTR BTW when it detects that the SLC control program has set the EN flag If the RIO scanner detects any problem at this point such as invalid BT control field or unconfigured device the M1 input status buffer s error code field fills in and the ER Error flag in the status field sets If no problems occur the EW Enable Waiting flag and ST Start flag set in the status field Note that the ST flag will not set if the scanner is already in the process of block transferring data to a location within the same logical rack The ST flag sets only after any previous pending to the same logical rack have been completed and the BT request has been scheduled on the RIO link RIO Block Transfer 7 115 Your SLC control program can monitor the block transfer by examining the 1 status flags They indicate when the scanner has started processing EW and ST flags the BT and whether the BT operation completed successfully DN flag or failed ER flag Your SLC control program takes different actions based on
134. ctions RIO Configuration Worksheet Appendix C This appendix provides a worksheet to help you configure your RIO devices We recommend that you use a photocopy of the worksheet so you retain a blank worksheet for future applications SLC Processor Input Image High Byte Bit Number Decimal 15 87 Logical Rack 0 Logical Rack 1 Logical Rack 2 Logical Rack 3 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 24 Group 25 Group 26 Group 27 Group 28 Group 29 Group 30 Group 31 Low Byte 0 I e 0 1 2 I e 3 I e 4 I e 5 I e 6 l e 7 I e 8 I e 9 I e 10 1 11 I e 12 I e 13 I e 14 I e 15 16 I e 17 I e 18 I e 19 20 I e 21 I e 22 23 I e 24 25 26 I e 27 28 29 I e 30 I e 31 Bit Number Decimal Logical Rack 0 Logical Rack 1 Logical Rack 2 Logical Rack 3 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 24 Group 25 Group 26 Group 27 Group 28 Group 29 Group 30 Group 31 SLC Processor Output Image
135. d OBEN Group 1 Word 1 Group 2 Word 2 ___ path of the BTR ISLC 5 02 processor or later 1 1747 RIO Scanner 1 0 n Image Logical Group3 Word 3 Rack 0 Group 4 Word4 Group5 Word 5 Word 6 Group7 Word7 Group0 Word 8 Group1 Word 9 bus Group 7 Word 23 ane xu Group 1 Word 25 rou or Logical Group 2 Word 26 k ack3 Group 3 Word 27 bare Group 4 Word 28 Group 5 Word 29 e Group 6 Word 30 Group 7 Word 31 Slot 0 Slot 0 Adapter or Intelligent I O Module Slot 1 Slot 1 The steps below detail a successful Block Transfer Read BTR 1 The MO file contains BTR control information which controls initiates the scanner BTR operation Refer to the Block Transfer Buffer Layout section for details on control information The SLC control program initiates a block transfer read by commanding the scanner to perform the read operation The adapter intelligent I O module sends BTR data across the RIO link to the RIO scanner The scanner writes the BTR data to a unique M1 file location that you specify Also one byte of the scanner s I O image file is used for handshake purposes between the scanner and the adapter intelligent I O module Note that the SLC control program must never read of write to this handshake image space Using the 1 file and a COP
136. determine the type of slot addressing required SLC Scanner Configuration Scanner Configuration and Programming 5 87 Your SLC processor can be programmed with an HHT Hand Held Terminal Although the configuration steps are similar they are not identical Therefore the following basic steps are provided For specific instructions refer to the user manual included with your programming device For more information on M and G files refer to Appendix B 1 Locate an open slot in your SLC chassis Remember that you must use an SLC 5 02 or later processor Assign the scanner to a physical slot in the SLC processor s chassis by selecting Scanner from the list If the scanner selection is not available select OTHER from the I O Configuration Screen and enter the Code ID number 13609 Enter the number of Scanned Input and Output Words using the Specialty I O and Advanced Setup menus The default value is 32 I O words You can specify less than 32 and reduce the processor scan time by transferring only the part of the input and output image that your application requires Important Do not set either of these values to 0 If you do the scanner will not work correctly 4 Using the Specialty I O Configuration menu set the M1 and MO 6 file sizes to 32 words 48 words if using complementary I O 32 words is the minimum required for operation If you do not set the M1 and MO file sizes to at least 32 words the programming
137. e I O slot 1 decimal format address 0 1 2 3 4 5 6 7 8 9 G1 0 XXXX 0 0 0 0 0 0 0 0 0 G1 10 0 0 0 0 0 0 16 word G file I O slot 1 hex bcd format address 0 1 2 3 4 5 6 7 8 9 G1 0 XXXX 0000 0000 0000 0000 0000 0000 0000 0000 0000 G1 10 0000 0000 0000 0000 0000 0000 16 word file I O slot 1 binary format address 15 data 0 G1 0 XXXX XXXX XXXX XXXX G1 1 0000 0000 0000 0000 G1 2 0000 0000 0000 0000 G1 3 0000 0000 0000 0000 G1 4 0000 0000 0000 0000 G1 5 0000 0000 0000 0000 G1 6 0000 0000 0000 0000 G1 7 0000 0000 0000 0000 G1 8 0000 0000 0000 0000 G1 9 0000 0000 0000 0000 G1 10 0000 0000 0000 0000 G1 11 0000 0000 0000 0000 61 12 0000 0000 0000 0000 G1 13 0000 0000 0000 0000 G1 14 0000 0000 0000 0000 G1 15 0000 0000 0000 0000 Editing G File Data Data in the G file must be edited according to your application and the requirements of the specialty I O module You edit the data offline under the I O configuration function only With the decimal and hex bcd formats you edit data at the word level e GlI 1 234 decimal format G1 1 OOEA hex bcd format Publication 1747 6 22 MO M1 Files and Files B 207 With the binary format you edit data at the bit level GI 19z1 Important Word 0 of the G file is configured automatically by the processor according to the particular specialty I O module Word 0 cannot be edited Publication 1747 6 22 208 1 Files and G Files Publication 1747 6 22 Dire
138. e status of all devices on the Description scanner s RIO link M1 is a read only file do not write to this file Words 0 47 of the M1 file provide the following information e Word 0 M1 e 0 general communication status overall device fault and communications attempted Word 2 M1 e 2 RIO baud rate status Word 3 M1 e 3 complementary device starting address status Word 4 M1 e 4 complementary logical image size status Word 5 M1 e 5 complementary active device status e Word 8 M1 e 8 primary normal device starting address status e Word 9 M1 e 9 primary normal logical image size status e Word 10 M1 e 10 active device status Words 12 15 M1 e 12 15 device fault status Words 16 31 M1 e 16 31 primary normal device retry counters Words 32 47 M1 e 32 47 complementary device retry counters General Word 0 bit 0 is the Enabled Device Fault status bit When any Communication Status enabled device is faulted this bit is set to 1 A fault may be caused by Enable Device Fault a communication problem with a remote device Bit M1 Status File Word 0 Bit Number decimal 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 MiFile General Communication Status Word Word 0 x x x x x x x x x x x X X x 1 1 Mt e 0 Enabled Device Fault Bit Publication 1747 6 22 5 78 Scanner Configuration and Programming General Communication Status Communic
139. e that can be assigned to a device on the RIO link is 1 4 logical rack in the G file configuration This allows up to four separate devices per logical rack Each device could have a maximum of four BTs configured to it Thus up to 16 BTRs and or 16 BT Ws could be assigned to each logical rack e f a BT device is a 1747 ASB RIO Adapter then multiple SLC 500 modules such as analog modules could be scanned by the 1747 ASB and the data block transferred to the RIO scanner Since the RIO network handles one BT request per logical rack at a time there will be a delay before all devices in the 1747 ASB rack can be accessed Therefore you should only perform BTS as necessary i e on demand Inhibiting a device on the RIO network via control words MO e 8 11 precludes that device from block transfer operations Attempting to initiate a BT to an inhibited device results in an error reply The scanner cancels a BT that is in progress if it detects that the device is inhibited Because of the asynchronous nature of inhibiting a device that has a BT in progress the BT reply may indicate either a successful completion or an error In either case the SLC control program must still clear the Enable flag All MO and BT buffers are cleared set to all zeros after a power cycle and when the SLC processor goes from Program to Run mode Program to Test mode or Test to Run mode When using complementary I O if you configure a complemen
140. e the SLC 5 0x that the block has been transferred and the block area is free to transfer a new data block This bit is held set until the corresponding bit in DTCW is cleared by the primary processors When the secondary 1747 BSN receives a new data block from the primary system it writes the block into the M1 area to be read by the secondary SLC 5 0x and sets its corresponding bit in DTSW to advise that this new block is ready to read After reading the block the SLC 5 0x must set the corresponding bit in DTHW Then the 1747 BSN module clears the bit in DTSW The following figure shows the meaning of the bits in this word Un p w 5 14 13 12 11 10 9 8 7 M1 s 3410 010 10101010000 ele ol p Block 1 Block 2 g Block 3 Block 4 Block 5 p gt Block 6 p gt Block 7 p gt Block 8 E Block 10 oc Bleck 11 p gt Block 12 p gt Block 13 p gt Block 14 p gt Block 15 p gt Block 16 DTSW Word Publication 1747 6 22 6 96 Module Control and Status Word Data Transfer Handshake Word Publication 1747 6 22 The Data Transfer Handshake Word DTHW is used in the data table transfer from primary to the secondary system Each bit corresponds to a block in the 1747 BSN module When the secondary 1747 BSN receives a new block from the primary system it write
141. e two SLC processors and permit the secondary processor to assume control of the process In addition the 1747 BSN module provides high speed transfer of the data table values from the primary to the secondary system HSSL to ensure that the secondary system s data table is a copy of the primary system s 2K words maximum per BSN module pair exchange of information on the status of the primary and secondary systems LSL automatic transfer to the secondary system of the remote input discretes and analog values etc transfer of control from the primary processor to the secondary processor when one of the following conditions occur power failure or power loss major processor fault 1747 BSN module fault including communications time out in the RIO link change in the primary processor s mode from RUN to PROGRAM manual switchover REM RUN to REM PROG Publication 1747 6 22 1 40 Overview Publication 1747 6 22 REM RUN to REM TEST transfer of control from the primary processor to the secondary when one of the following conditions is detected by the secondary processor communication timeout in the HSSL between the two 1747 BSN modules and primary system is not updating the remote I O transfer of control command from the primary 1747 BSN module substitution of equipment without interruption of the process that is the faulted system can be repaired while the other system is
142. ecialty I O module to a slot the procedure is the same as assigning other modules the following functions appear at the bottom of the screen HEAD ONLINE MODIF MODIF DELETE UNDEL EXIT SPIO CONFIG CONFIG RACKS SLOT SLOT SLOT CONFI F1 F2 F4 F5 F6 F7 F8 F9 Publication 1747 6 22 B 198 MO M1 Files and G Files Complete the following steps to configure the MO and MI files 1 Press 9 Specialty I O Configuration The following functions appear GFILE NUMBE G FILE SETUP SIZE 1 F5 F7 2 Press r5 Advanced Setup The following functions appear INPUT OUTPUT SCANNE SCANNE MO FILE MT FILE SIZE SIZE INPUT OUTPUT SIZE SIZE F1 F2 F3 F4 F5 F6 3 Press r5 then enter the number of MO file words required the required number is listed in the user manual for the specific specialty I O module 4 Press re then enter the number of M1 file words required the required number is listed in the user manual for the specific specialty I O module The specialty I O module may require that you also configure the G file and specify an ISR interrupt subroutine number These tasks are accomplished with function keys F1 F3 and F7 shown in step 1 above G files are discussed later in this appendix Addressing MO M1 Files The addressing format for MO and MI files is below Mf e s b Where module Lu
143. econdary SLC 5 04 only answers to commands It cannot start a MSG instruction The primary SLC 5 04 cannot send messages through DH to the secondary SLC 5 04 The secondary processor can be programmed through an access point address which corresponds to the processor node address plus one n 1 The secondary processor becomes part of the link only after a switchover If the real node address is 5 the primary is the node 5 and the secondary is node 6 If the real node address is 77 the primary is node 77 and the secondary is node 0 It is possible that the primary processor could have possession of the token during a switchover from the primary to the secondary processor In this case the token could be lost even though passage of the token from one station to the next is done as quickly as possible If the token is lost all the stations on the link have an internal watchdog timeout 250 ms and the nodes assume the token is lost The other stations on the link initiate a token recovery procedure which includes recreating the active node table rebuilding the link including the new primary processor ensuring that one node gains control of the link If the new primary is Polling the link Message packet from another station disrupted Switchover Considerations 8 161 During this time while the stations reconstruct the link communication is interrupted The length of the interruption depends on the number of stati
144. econdary module in order to avoid switchover problems in the backup system Switchover from one processor to another takes less than 50 ms Note Total switchover time is a factor of the 1747 BSN module delay and one program scan of the secondary processor The time required for one program scan is added because the secondary processor technically has not assumed control until it has completed one scan of its program and remote I O after a switchover When a failure occurs in the primary system the remote outputs remain in the state set by the primary processor prior to switchover while the secondary processor assumes control of the process Important You must program the backup system to account for the following time requirements input signal update time time out on remote I O link data table transfer time over the HSSL Publication 1747 6 22 8 158 Switchover Considerations Publication 1747 6 22 Input Signal Update Time It is possible for the secondary processor to read different input conditions immediately after the switchover To avoid a sudden change in the outputs during switchover all of the input signals must be present for an amount of time equal to the sum of the following program scan e T O scan e input module delay 1747 BSN switchover time If these conditions are not met outputs may be assigned different states in the two processors This can cause a sudden change of operation when switcho
145. ents Variable Variable Description Location of Variable Ti im a processor scan time APS reference manual see the section RIO Scan Time Tnio The total RIO scan time ms Calculation Tajo on page B 4 Additional time due to sending see the section Determining bix any BT data on the RIO link Top page B 7 The adapter throughput delay Tadp For a 1747 ASB this is two adapter user manual ASB backplane scan times TSNo bt Backup scanner output delay see the section Determining time with BTs present TsNo bt page 7 Tas The backup scanner module 5 ms constant value for all SNi input delay time ms formulas in this appendix T The input module delay time I O product data and id ms instruction sheets T The output module delay time I O product data and I O od ms instruction sheets Determining Tsyo bt Use the following table to find Tg y for your particular configuration Important The times shown are to the best of our knowledge the maximum delay times of the backup scanner However in instances that throughput is an important consideration test the application thoroughly first to ensure proper operation Note that in most situations the average throughput is much better than the calculated maximum throughput Specifications A 191 All Baud Rates 57 6Kbaud 3 2K nes 1 Logical Rack 16 0 19 0 24 0 32 0 2 Logical Racks 19 0 23 0 27 0 36 0 3 Logical Racks 22 0 26
146. epends on the baud rate and extended node capability as shown in the table that follows Important To use extended node all devices on the RIO link must support it Refer to each device s user manual Publication 1747 6 22 3 50 Installation and Wiring Max Cable Distance Baud Rate Belden 9463 Resistor Size igh 57 6K baud 3048 m 10 000 ft Evtendedt 82Q 1 2 Watt xtendedNode 115 2K baud 1594 m 50001 Gray Red Biack Gold Capability 230 4K baud 762 m 2 500 ft 57 6K baud 3048 m 10 000 ft 1500 1 2 Watt Not Using 1152K 1524 m 5 0001 Brown Green Brown Extended Node 5 2K baud 524 m 5 000 ft Gold Capabilit 230 4K baud 762 m 2 500 ft Gray Hed Black Gold Status LEDs The table below describes the six LEDs located on the module s front panel To ensure that they are operating correctly all LEDs are illuminated during power up LED Definition Status amp Color Indication The module is in the primary PRI Primary Steady Green od The module is in the SEC Secondary Steady Amber secondary mode n The RIO link is working RIO RIO Communication Steady Green properly A remote device is not Flashing Green configured or connected correctly or is faulted The RIO link has a fault The scanner is connected Flashing Red incorrectly or all devices are configured improperly have no power or are faulted Steady Red There is a configuration error
147. ers Publication 1747 6 22 Configuration Selection Chapter 3 Installation and Wiring This chapter contains the information necessary to select the baud rate configure the Backup Scanner insert the Backup Scanner into the SLC chassis wire the RIO and communication links Compliance to European Union Directives If this product has the CE mark it is approved for installation within the European Union and EEA regions It has been designed and tested to meet the following directives EMC Directive This product is tested to meet Council Directive 89 336 EEC Electromagnetic Compatibility EMC and the following standards in whole or in part documented in a technical construction file EN 50081 2 EMC Generic Emission Standard Part 2 Industrial Environment EN 50082 2 EMC Generic Immunity Standard Part 2 Industrial Environment This product is intended for use in an industrial environment The six position Configuration DIP Switch is used to select the baud rate configure the communication channel and identify each individual BSN module and the last BSN module The tables below define the DIP switch configuration settings DIP Switch Definition Setting Position 1 and 2 Set the communication channel baud rate he tabled page 2 DH ON 3 Channel configuration RIO OFF This user identification switch differentiates between BSN modules in the primary system and BSN 4
148. eserved and 1 are cleared set to zero either when the RIO scanner goes through a power cycle or Words 64 words for BT Words 110 173 Read Data 3210 3273 in i BT when the SLC processor commands the scanner to change LLL LL E gt mode from Program to Test mode Program to Run mode or Test to Run mode Publication 1747 6 22 7 108 RIO Block Transfer Scanner I O Image Allocation For Block Transfer Block transfer operations BTR and BTW consume only one byte of the RIO scanner s I O image file independent of what type of I O slot addressing is used This one byte image is reserved for communication handshake purposes between the remote device adapter or intelligent I O module and the scanner SLC control programs must never read write to these image locations because unpredictable operations may result Block transfer operations BTR and BTW can be addressed to any logical slot within the RIO scanner s four logical racks See the examples below and on the following page Examples of BT I O Image File Allocation The minimum portion of the scanner s image that can be assigned to an Examge47 SN RIO Scanner s I O Image Files adapter is 1 4 logical rack Each logical device that you assign BT Group 0 Word 9 Input Image Output Image operations BTR or BTW consumes TT Group 2 Word 2 one byte from the s
149. ess Word 1 of the G file Likewise the display in words M1 e 32 47 correspond to the bits set in the Complementary Logical Device Address Word 3 of the G file Important Your SLC control program cannot initialize clear retry counters Scanner Configuration and Programming 5 85 Retry Counter Example for Primary Devices The scanner s I O image tables are configured as shown with M1 status files displaying the corresponding retry counters GFile Primary Bit Number 44 13 42 mn 0 9 8 7 6 5 4 3 2 1 0 RIO Logical Rack3 Logical Rack 2 RIO Logical Rack 1 Logical Rack 0 Starting Group Starting Group Starting Group Starting Group spacings RO Primary Logical Device Address Word 1 vu al mer aie devices G File Complementary BitNumber 5 13 12 dn 10 9 8 7 6 5 4 3 2 1 0 RIO Logical Rack 11 Logical Rack 10 RIO Logical Rack9 Logical Rack 8 Starting Group Starting Group Starting Group Starting Group Si Complementary Logical Device Address Word 3 Specifies RIO addresses for o e t o o o o o o o o o complementary devices M1 e 16 communication retry counter for RIO logical rack 0 group 0 1 17 not used in this example M1 e 18 communication retry counter for RIO logical rack 0 group 4 1 19 not used in this example M1 e 20 communication ret
150. forms as many RIO discrete transfers as necessary to update the entire adapter image If RIO discrete transfers do not occur data is not exchanged between the scanner and adapter RIO discrete transfers are asynchronous to the processor scan RIO Discrete E EE E Transfers with A Adapter 1 RIO Discrete Transfers with Adapter 2 PanelView Operator Termina RIO Discrete Transfer n n n with Adapter 3 iS E E ain fe F espesgs RIO Discrete ple Transfers Boog with Adapter 4 5599 RediPANEL Scanner I O Image Concepts The scanner s I O image consists of RIO logical racks and I O groups full RIO logical rack consists of eight input image and eight output image words A word consists of 16 bits of data Each word within an RIO logical rack is assigned an I O group number from 0 to 7 You assign devices on the RIO link a portion of the scanner s image Devices can occupy a quarter logical rack 2 input and output words half logical rack 4 I O words three quarter logical rack 6 I O words or full logical rack You may configure dev
151. gard to program scans even though remote I O scans are performed asynchronously the need to disable message instructions in the secondary processor using the primary secondary bit Specifications Backup Scanner Operating Specifications include Appendix A scanner operating specifications network specifications throughput introduction calculating throughput This appendix provides and system specifications as well as throughput information for the Backup Scanner Module Topics Backplane Current Consumption 800 mA at 5V Operating Temperature 32 to 140 0 C to 60 C Storage Temperature 40 F to 185 F 40C to 85 C Humidity 5 to 95 without condensation Noise Immunity NEMA Standard ICS 2 230 Agency Certification when product or packaging is marked UL listed C UL listed Class Division 2 Groups A B C D Temp Code T3C CE compliant for all applicable directives Network Specifications and Terminating Resistor Size Baud Rate Determination of Maximum Cable Length Max Cable Di ue Baud Rate Belden 9463 Resistor Size isla 57 6Kbaud 3048 m 10 000 ft g 820 1 2 Watt ExtendedNode 115 2Kbaud 1524m 6 000 ft Gray Hed Black Gold Capability 330 4K baud 762 2 500 tt 57 6K baud 3048 m 10 000 ft 1500 1 2 Watt Not Using Brown Green Brown praat Using 115 2Kbaud 1524 5 000 ft Gold Capabilit
152. gical Group Starting Logical Group Logical Group Logical Group rimary Normal Logical S P Device Address NU AUN 0 et DE Specifies the RIO starting Word 1 olo t 1 ol o 0 1 1 A addresses of primary normal logical devices RIO Rack 3 RIO Rack 2 RiO Rack 1 RIO Rack 0 Image Size mage Size mage Size Image Size Primary Normal Logical Specifies the logical image Image Size 6 4 2 016 4 2 0 6 4 2 0 6 4 2 0 Size assigned to primary Word 2 1 1 1 1 1 1 1 1 1 1 o 1 normal logical devices set in Word 1 ded Logical pak 10 RIO Logical Rack 9 Starting p Rack 8 Starting tarting Logical Group tarting Logical Group Logical Group ogical Group Complementary Logical Specifies the RIO starting Adaress 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 addresses of Word 3 olo o oj jo 1 olo o o o o complementary logical devices RIO Rack 11 RIO Rack 10 RIO Rack 9 RIO Rack 8 Complementary Logical Image Size Image Size mage Size Image Size Ducem Werda 6 4 2 0 6 4 2 o 6 4 2 0 6 2 0 _ Specifies the logical a image size assigned to ott complementary logical devices set in Word 3 Note A complementary logical rack is always numbered 8 above its primary logical rack Also logical racks 8 9 10 and 11 are sometimes referred to as complementary logical racks 0 1 2 and 3 Publication 1747 6 22 f Quarter Logical
153. gnificant Transferring Data Between Processor Files and MO or M1 Files The processor does not contain an image of the MO or MI file Asa result you must edit and monitor MO and M1 file data via instructions in your ladder program For example you can copy a block of data from a processor data file to an MO or 1 data file or vice versa using the COP instruction in your ladder program The COP instructions below copy data from a processor bit file and integer file to an MO file For the example assume the data is configuration information affecting the operation of the specialty I O module 8 1 1 COPY FILE The COP instruction below copies data from an M1 data file to an integer file This technique is used to monitor the contents of an MO or MI data file indirectly in a processor data file COPY FILE Source M1 4 3 Dest N10 0 Length 6 1 Files and G Files B 201 Access Time During the program scan the processor must access the specialty I O card to read write MO or M1 data This access time must be added to the execution time of each instruction referencing or 1 data For the SLC 5 03 and SLC 5 04 processors the instruction types vary in their execution times The following table shows approximate access times per instruction or word of data for the SLC 5 02 SLC 5 03 and SLC 5 04 processors
154. hange should also be done in the primary processor If the primary operating mode is changed from Run mode to Program mode the secondary system takes control ATTENTION Use the processor mode change key to change the primary operating mode Unexpected operation or system shutdown could occur if you use a programming terminal to change the primary operating mode from Remote Run to Remote Program Publication 1747 6 22 4 58 Operating Your SLC 500 Backup System Fail over Sequencing Power Down Sequencing Restarting a failed system Publication 1747 6 22 When the primary system fails the communications relays are opened immediately The primary 1747 BSN ceases its data transfer function and sends switching commands to the secondary 1747 BSN After all the RIO communications terminate the secondary communication channel relays are closed Then the former secondary SLC is ready to take control of the system Since the secondary s input image table has been loaded on line with real data from the Smart Switch the application program does not have to delay the use of its input image table until the completion of at least one complete RIO scan The secondary s now primary input image table always has valid data No special considerations beyond the standard precautions for a programmable controller are required when powering down the system Power down should begin with the secondary system and proceed to the primary If the p
155. hannel switchover for communications to devices such as operator interface DH The backup scanner also provides a High Speed Serial Link HSSL to write any retentative data from a primary to a secondary processor In addition the module has a Local Serial Link LSL to pass status information between multiple BSN modules located in the same chassis optional The 1747 BSN is a complementary set of modules with one module residing in the primary system and another module in the secondary or backup system The primary module controls the operation of remote I O while the secondary module is available to take over control in the event of a fault in the primary The backup scanner has the capability to switch between two communication channels The first channel is configurable as RIO or The second channel is used to switch the RS232 485 channel in order to provide connection for electronic operator interfaces The Remote I O RIO scanner Catalog Number 1747 SN is the remote I O scanner for the SLC 500 It enables communication between an SLC processor SLC 5 02 or later and remotely located 3 048 meters 10 000 feet maximum 1746 I O chassis and other RIO compatible Allen Bradley operator interface and control devices The 1747 SN scanner communicates with remotely located devices using the A B Remote I O link The RIO link consists of a single master scanner and multiple slaves adapters Publication 1747 6 22 1 18
156. he Local Status Link is not working well in either the local or the remote system If the system has only one 1747 BSN module in each chassis the LSL is not be used and is always reset The normal state of this bit is OFF Buffer Full This bit is set when the secondary 1747 BSN is receiving a second block of data This occurs before the reading of the first block by the secondary SLC 5 0x The normal state of this bit is OFF System Ready to Switchover This bit is set when the backup system is ready to switchover It is reset when there is one or more errors occurring in the backup system and the system cannot switchover The normal state of this bit is ON Remote I O Link This bit is set when one or more of the RIO links in the system is faulted or has communication errors The normal state is OFF Processor Fault This bit is set when either the local or remote processor is in failure in Program mode or in Test mode The normal state of this bit is OFF Primary System This bit is set when the local system is in primary state Publication 1747 6 22 Module Control and Status Word 6 91 Secondary System This bit is set when the local system is in the secondary state If the primary bit is set the secondary system bit is not set The reverse is also true When the secondary bit is set the primary bit is not set At powerup and during switchover these primary and secondary bits could be reset at the same time N
157. he last section illustrate a technique allowing you to capture and use MO or M1 data as it exists at a particular time In the first figure bit MO 2 1 1 could change state between rungs 1 and 2 This could interfere with the logic applied in rung 2 The second figure avoids the problem If rung 1 is true bit B3 10 captures this information and places it in rung 2 In the second example of the last section a COP instruction is used to monitor the contents of an 1 file When the instruction goes true the 6 words of data in file M1 4 3 is captured as it exists at that time and placed in file N10 0 Specialty I O Modules with Retentive Memory Certain specialty I O modules retain the status of MO M1 data after power is removed See your specialty I O module user s manual This means that an instruction having an MO or 1 address remains on if itis on when power is removed hold in rung as shown below will not function as it would if the OTE instruction were non retentive on power loss If the rung is true at the time power is removed the OTE instruction latches instead of dropping out When power is again applied the rung will be evaluated as true instead of false M0 2 1 1 E 0 1 M0 2 1 E 1 ATTENTION When used with a speciality I O module having retentive outputs this rung can cause unexpected start up on powerup You can achieve non retentive operation by unlatching the retentive output
158. he next transfer for that particular data block number The Data Transfer Control Word DTCW is used to control the data table transfer from primary to the secondary system Each bit corresponds to a block in the 1747 BSN module If the primary SLC 5 0x writes a new block into the primary 1747 BSN then one bit corresponding to this block must be set in the DTCW word to advise the backup module that a new valid block is ready to be transferred to the secondary SLC 5 0x The figure below shows the meaning of the bits in this word 5 14 13 12 11 10 9 8 7 5 4 3 6 2 0 34101010 101010000000 101010010 P Block 1 Block 2 Block 3 Block 4 Block 5 B Block 6 W Block 7 p gt Block 8 B Block 9 p gt Block 10 p gt Block 11 p gt Block 12 Bp Block 13 p gt Block 14 p gt Block 15 p gt Block 16 DTCW Word Data Transfer Status Word Module Control and Status Word 6 95 The Data Transfer Status Word DTSW is used in the data table transfer from primary to the secondary system Each bit corresponds to a block in the 1747 BSN module When the primary SLC 5 0x writes a new block into the primary 1747 BSN and sets the bit corresponding to this block in DTCW the BSN module transfers the block to the secondary backup module The 1747 BSN also sets the corresponding bit in DTSW to advis
159. he second and third diagrams illustrate in greater detail the theory of operation of a BTR and a BTW respectively Publication 1747 6 22 7 104 RIO Block Transfer RIO Block Transfer Theory of Operation Path of a Block Transfer Chassis Backplane rocessor RIO Scanner 1 0 Image ___ path of a Block Transfer BT SLC 5 02 processor or above Publication 1747 6 22 Refer to the diagrams on the following pages for more details on BTR and BTW sequence of operation Block Transfer Write BTW data travels from the SLC processor across the chassis backplane via the scanner s M files The scanner then sends the data across the RIO link to the adapter of intelligent I O module Block Transfer Read BTR data travels from the adapter of intelligent I O module over the RIO link to the scanner The chassis backplane then transfers BTR data via the scanner s M files to the SLC processor The SLC control program processes the data once the SLC receives it from the scanner Adapter or Intel igent Module SLC Processor Chassis r RIO Block Transfer 7 105 RIO Block Transfer Theory of Operation Block Transfer Read BTR In this example Logical Rack 0 Logical Group 0 Logical Slot 1 is used Backplane file wi e M 1 file One byte is consumed from the input and output images file for handshake purposes aa T Image Group 0 Wor
160. his section we e show a typical SLC 500 backup configuration explain how the backup system works describe the role of the 1747 BSN module Overview 1 37 A Typical SLC 500 Backup Configuration A SLC 500 backup system contains a minimum of two each of the following hardware components SLC 500 processor module Processor Catalog Number SLC 5 02 1747 L524 SLC 5 03 1747 L531 L532 SLC 5 04 1747 L541 L542 L543 SLC 5 05 1747 L551 L552 L553 Contact your Allen Bradley Sales Office or your Allen Bradley distributor for additional SLC 500 processors that can be configured with the 1747 BSN modules 1747 BSN module power supply local chassis Publication 1747 6 22 1 38 Overview Publication 1747 6 22 How the SLC 500 Backup System Works In the SLC 500 backup configuration one system consisting of one SLC 500 processor 1747 BSN module power supply and chassis controls the operation of the remote I O This system is referred to as the primary system The other system is ready to take control of the remote I O in the event of a fault in the primary system This is referred to as the secondary system The SLC 500 backup system does not back up local I O therefore do not install I O in the local chassis The system provides high speed data table transfer from the primary system to the secondary system This guarantees that the data tables of the two processors track each other To provide the possibi
161. ices to start at any even I O group number within an RIO logical rack More than one physical device s adapter I O information can reside in a single logical rack Also by crossing logical rack boundaries a device can consist of more than one logical rack Important The illustration below shows only the input image configuration of the scanner s I O image The output image configuration is the same RIO Logical Rack 0 RIO Logical Rack 1 RIO Logical Rack 2 RIO Logical Rack 3 Overview 1 23 Input Image Half of a Scanner s I O Image Bit Number decimal 5 44 12 n 1 9 a8 7 6 5 4 3 2 1 o Rack 0 Group 0 Word 0 Quarter Logical Rack 0 Group 1 Word 1 Rack 0 Group 2Word 2 Rack 0 Group 3 Word 3 Not Used In This Rack 0 Group 4Word 4 Example Rack 0 Group 5 Word 5 Rack 0 Group 6Word 6 Rack 0 Group 7 Word 7 Het Logical Rack 1 Group 0Word 8 Rack 1 Group 1 Word 9 Rack 1 Group 2Word 10 Not Used In This Rack 1 Group 3 Word 11 Example Rack 1 Group 4Word 12 Rack 1 Group 5 Word 13 Rack 1 Group 6Word 14 Three Quarter Rack 1 Group 7 Word 15 Logical Rack Rack 2 Group 0Word 16 Rack 2 Group 1 Word 17 Not Used In This Rack 2 Group 2Word 18 __Example Rack 2 Group 3 Word 19 Rack 2 Group 4Word 20 Full Logical Rack 2 Group 5 Word 21 Rack Rack 2 Group 6Word 22 Rack 2 Group 7 Word 23 Rack 3 Group 0Word 24
162. ile location for Data Block 5 in the BSN module B3 5 B3 6 COP y Le Copy File 4 4 Source N15 0 Dest 0 1 4012 Length 128 B3 7 CL 4 Unlatch the virtual DTCW bit for Data Block 5 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 5 when B3 7 4 has been unlatched the BSN module is ready for the next data transfer via Data Block 5 B3 6 B3 7 QU 4 4 This rung monitors the DTCW and DTSW bits for Data Block 6 When a transfer of data using Data Block 6 is not in progress copy up to 128 words to the appropriate M file location for Data Block 6 in the BSN module B3 5 B3 6 COP P Copy File 5 3 Source N15 128 Dest 0 1 4140 Length 128 B3 7 L5 5 Unlatch the virtual DTCW bit for Data Block 6 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 6 when B3 7 5 has been unlatched the BSN module is ready for the next data transfer via Data Block 6 B3 6 B3 7 AUS 5 5 Publication 1747 6 22 9 174 0013 0014 0015 0016 0017 0018 0019 0020 Programming Techniques This rung monitors the DTCW and DTSW bits for Data Block 7 When a transfer of data using Data Block 7 is not in progress copy up to 128 words to the appropriate M file location for Data Block 7 in the BSN modu
163. input image words and eight output image words Logical Slot A logical slot consists of one input and one output byte within a logical group A byte consists of 8 bits each bit represents one terminal on a discrete I O module M files The SLC and MI data files that reside in the scanner M files contain RIO network status M1 and control MO information The contents of these files can be directly accessed by your application program Also the M files are used to control and monitor RIO block transfer operations Glossary 213 Module Status Word MSW This word is M1 s 3401 where s slot number of the BSN and is used to monitor the status of the 1747 BSN itself and its counterpart in the remote system Output file The scanner s output file that is updated during the SLC processor output scan Remote Chassis The chassis containing an ASB module and connected to the local SLC chassis via the RIO link Remote Expansion Chassis A chassis that is connected to a remote chassis using a 1747 C9 91 4 cm 36 in or 1747 C7 15 2 cm 6 in cable Reset Adapter Decide Commands sent by the scanner to a logical device during an RIO discrete transfer These commands instruct the logical device to reset all of its discrete outputs if hold last state is not selected or to hold all of its discrete outputs in their last state if hold last state is selected Reset Adapter Reset Commands sent by the scanne
164. instruction in the control program the scanner transfers the BTR data to the SLC processor via the chassis backplane The 1 file also contains BTR status information Refer to the Block Transfer Buffer Layout section for details on status information The SLC control program processes the BTR information Publication 1747 6 22 7 106 RIO Block Transfer RIO Block Transfer Theory of Operation Block Transfer Write BTW In this example Logical Rack 3 Logical Group 7 Logical Slot 1 1s used Chassis Backplane Slot 0 Slot 0 Slot 1 Slot 1 Logical MOTile SLC Processor M Files T mm 4 re Nea 1747 RIO Scanner Rack 0 Logical Rack 3 Group 0 Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 0 Group 1 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 ImaqeOutgut Image Group 7 Word 23 Group 0 Word 24 Group 1 Word 25 Group 2 Word 26 EN Group 3 Word 27 Group 4 Word 28 Group 5 Word 29 EN Group 6 Word 30 Group 7 Word 31 ___ path of the BTW One byte is consumed from the input and output image file for handshake purposes 151 5 02 processor or later Adapter or intelligent 1 0 Module The steps below detail a successful Block Transfer Write BTW 1 The use
165. is step until all possible data blocks are scanned 4 Copy the data block from the 1747 BSN module to the SLC 5 0x 5 Advise the 1747 BSN module that the data block was already read through the DTHW set the bit corresponding to the data block in this word 6 Increment the data block counter and check whether it is time to select the next 1747 BSN module If it is time to select the next module increment the module counter and restart the data block counter 7 Start step 1 in the next program scan The worst scenario with this transfer method is a system that has eight 1747 BSN modules in which each one is transferring 16 data blocks The total number of data blocks is 128 and the backup system spends 128 program scans to transfer all the data blocks Data Transfer Method 2 With method 2 the application program in the SLC 5 0x considers each data block independent from the other data blocks This is shown in the ladder program example earlier in this chapter for one set of BSN modules Reproduce this logic for additional sets of BSN modules being sure to update the slot number in the M file addresses for each set The following procedure is used in the primary SLC 5 0x for sending the data blocks 1 Read all the DTSWs from the respective 1747 BSN modules 2 Clearall DTCW bits corresponding to the data blocks that are marked as already transferred to secondary system in the DTSWs Send the data blocks to their respective
166. is possible that the two separate systems read the same input at different times Eventually different input values are read thus different decisions are made and the internal states of the two systems diverge If the two systems diverge the secondary system generates a bump when it takes control over the process The bump time is a function of how fast the inputs of the machine or the process are changing as well the amount of data to send between the primary and secondary units One possible method to avoid or reduce the bump is the loosely synchronized backup approach This method requires special user programming techniques With this approach primary and the secondary SLC 5 0x execute the same program and are synchronized at a waiting point once per program scan To limit divergence we recommend that the primary and secondary processors execute the same programs Backup communication functions provided by the SLC 500 backup system do not transfer the force tables from the primary to the secondary processors Therefore if the SLC 500 backup system has forces set in the primary processor the forces do not transfer to the secondary processor For this situation if a switchover occurs the secondary processor becomes active but the forces set in the original primary processor are not carried over ATTENTION Set the forces in the secondary processor first Then set the forces in the primary processor Likewise when
167. is very useful when portions of your input and output images are unused because it allows the images of two adapters to overlap each other in the scanner s I O image To use complementary I O the I O image from one adapter must be the mirror complement of the other This means that if there is an input module in the primary chassis there must be an output module in the same slot of the complementary chassis This enables total use of the scanner s 32 input and 32 output word image for I O addressing of up to 1024 discrete points ATTENTION Because the primary and complementary chassis images overlap input and specialty combination I O modules must never share the same image location Inputs received by the scanner may be incorrect and RIO block transfers will not be serviced properly If an output module shares its output image with another output module both output modules receive the same output information Publication 1747 6 22 1 26 Overview Publication 1747 6 22 If you want to use complementary I O two adapters that support this function are required e g 1747 ASB modules One adapter is configured via its DIP switches as a primary chassis the other as a complementary chassis If a primary chassis exists it is scanned first Primary and complementary chassis cannot have the same logical rack number The logical rack numbers must be assigned to the primary and complementary racks as shown below
168. isting of current Allen Bradley documentation including ordering instructions Also indicates whether the documents are Allen Bradley Publication Index SD499 available on CD ROM or in multi languages glossary of industrial automation terms and abbreviations Mn qe Industrial Automation AG 7 1 In depth information on grounding and wiring Allen Bradley Allen Bradley Programmable Controller 177044 programmable controllers Grounding and Wiring Guidelines If you would like a manual you can download a free electronic version from the internet at www theautomationbookstore com purchase a printed manual by contacting your local distributor or Rockwell Automation representative visiting www theautomationbookstore com and placing your order calling 1 800 963 9548 USA Canada or 001 330 725 1574 Outside USA Canada Publication 1747 6 22 Conventions Used in This Manual Allen Bradley Support 15 The following conventions are used throughout this manual Bulleted lists like this one provide information not procedural steps Numbered lists provide sequential steps or hierarchical information Italic type is used for emphasis e Textin this font indicates words or phrases you should type Allen Bradley offers support services worldwide with over 75 Sales Support Offices 512 authorized distributors and 260 authorized Systems Integrators located throughout the United States alone
169. ite BTW A form of block transfer that occurs when the SLC processor transfers data to a remote device Complementary I O Functionality that allows you to maximize I O usage by pairing up I O data from a primary and complementary chassis Discrete I O An input or output device that has corresponding bit locations in the scanner s input or output file Discrete I O Module I O module used to sense or control two state ON OFF devices Data Transfer Control Word DTCW This word is M0 s 3410 where s slot number of the BSN and is used by the primary processor to initiate data transfers to the primary BSN Eventually the primary processor initiates data transfers to the secondary BSN over the HSSL and then to the secondary processor Data Transfer Handshake Word DTHW This word is 0 5 3411 where s slot number of BSN and is used by the secondary processor to inform the secondary BSN that it has received the latest data block and is ready for the next data block Data Transfer Status Word DTSW This word is M1 s 3410 where s slot number of BSN and is used in both the primary and secondary systems to affect the transfer of data on the HSSL 212 Glossary Publication 1747 6 22 Extended Node Capability Functionality that allows you to use an 82 Ohm termination resistor at both ends of the RIO link for all baud rates This functionality also allows for up to 32 adapters to be connected to the RIO
170. k transfer reads execute continuously Use the same method for a BTW Publication 1747 6 22 7 130 RIO Block Transfer Rung 2 0 Configure the BTR operation type length and RIO address at power up Bit b3 100 7 must be set prior to going to ru to indicate a BTR operation POWER UP BTR BIT CONTROL Si SSS SSS FILE 15 Source B3 100 Dest 0 1 100 Length 341 4 Rung 2 1 Copy the BTR status area to a binary file which will be used throughout the program This avoids addressing the M1 file multiple times during each program scan Each time an instruction containing an M1 file bit word or file is scanned by the processor an immediate data transfer to the module occurs and therefore will impact the overall processor scan time BTR PENDING BTR STATUS B3 TCOP SS SS SS SS SS SS SSS COPY FILE 80 Source 1 1 100 Dest 3B3 0 Length 4 gs E E E EH EE E B TEE CHECK BTR STATUS B3 4 81 Rung 2 2 When the error or done bit is set indicating that the BTR completed either unsuccessfully or successfully the enable bit must be unlatched by the ladder program The 1747 SN scanner then unlatches the error done bit to complete the block transfer hand shake process at this time the check BTR status bit must be unlatched to avoid unnecessary M file accesses VIRTUAL CHECK
171. ke process VIRTUAL BTW ERROR BIL N7 64 12 Publication 1747 6 22 BTW ERROR CODE MOVE Source M1 1 203 BTW PENDING VIRTUAL BTW ENABLE CHECK BTW STATUS RIO Block Transfer 7 143 Rung 2 9 This rung executes block transfer reads continuously as fast as possible VIRTUAL VIRTUAL VIRTUAL BTR ENABLE BTR DONE BTR ERROR BTR BIT BIT BIT PENDING N7 50 N7 60 N7 60 B3 sass sssssssssssssssseessssssesss54 L 15 13 12 0 VIRTUAL BTR ENABLE BIT N7 50 L 2 10 15 This rung executes block transfer writes continuously as fast as possible VIRTUAL VIRTUAL VIRTUAL BTW ENABLE BTW DONE BTW ERROR BIT BIW DATA N7 53 N7 64 N7 64 Z COPY FILE d 15 13 12 Source N7 10 Dest 0 1 210 Length Tl q VIRTUAL BTW ENABLE BIT N7 53 pe L 15 BTW PENDING B3 T L 1 Rung 2 11 Move the virtual BTR control word to the MO file for the SN module while a BTR is in progress and continue doing so ut the enable done and error bits are all turned off completing the handshake process VIRTUAL BTR BTR ENABLE CONTROL BIT BITS VIRTUAL VIRTUAL BTR
172. ks 1 9 Logical Group 0 contain no primary device and a complementary 1 2 logical rack device Logical Racks 1 9 Logical Group 6 contain a primary 1 4 logical rack device and a complementary 1 4 logical rack device Logical Racks 2 10 Logical Group 0 contain a primary 3 4 logical rack device and a complementary 1 4 logical rack device Logical Racks 3 11 Logical Group 2 contain a primary 1 4 logical rack device and a complementary 1 2 logical rack device Logical Racks 3 11 Logical Group 6 contain a primary 1 4 logical rack device and no complementary device 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 Bit Number V O Mix Word 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 RIO Logical Rack StartingRIO Logical Rack 2 RIO Logical Rack 1 Starting RIO Logical Rack 0 Starting Pri N i Logical Logical Group Starting Logical Group Logical Group Logical Group Device Address ogsa 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 Word 1 1 RIO Rack 3 RIO Rack 2 RiO Rack 1 RIO Rack 0 Image Size Image Size mage Size Image Size Primary Normal Logical Image Size 6 4 2 0 6 4 2 0 6 4 2 0 6 4 2 0 Word 2 1 0 1 0 1 1 1 1 0 0 0 1 1 1 0 RIO Logical Rack 11 RIO Logical Rack 10 RIO Logical Rack 9 StartingRIO Logical Rack 8 Starting Compl Starting Logic
173. l 15 A 1 Q Decimal 15 8 7 Decimal Slot1 S Slot 1 Slot 1 Slot 1 Slot 1 Slot 1 Slot S Slot 1 Slot 1 Slot 1 Slot 1 Slot 1 Slot 2 S Slot 2 Slot 2 Slot 2 Slot 2 Slot 2 Slot 2 S Slot 2 Slot 2 Slot 2 Slot 2 Slot 2 Slot 3 S Slot3 Slot3 Slot3 Slot3 Slot3 Slot 3 S Slot3 Slot3 Slot3 Slot3 Slot 3 Slot S Slot4 Slot 4 Slot 4 Slot 4 Slot 4 Slot 4 S Slot4 Slot 4 Slot 4 Slot4 Slot4 Slots S Slot Pair s Slot Pair 905 Slots Slot Pair 9015 S Slot Pair Slot 5 S Slot5 Slot 5 Slot 5 Slot 5 S Slot 6 S Slot 6 Slot 6 Slot 6 Slot 6 S Slot 6 S Slot 6 Slot6 Slot 6 Slot 6 Si 907 S Slot 7 907 Slot 7 907 S Slot 7 S Slot 7 Slot 7 Slot 7 Slot 7 Si Slot 8 S Slot8 Slot8 Slot 8 Slot 8 9 Slot 8 5 Slot8 Slot8 Slot 8 Slot 8 Si Scanner s I O Image Both imagas are overlapped in the scanner The overlapped image appears where the primary chassis image is configured to reside In this case the primary chassis image is configured as starting logical rack 0 and starting logical group 0 space N wn 3 D Input Image Output Image 17 10 7 0 Octal 17 10 7 0 Octal 15 8 7 Decimal 15 d y Decimal Group0 Slott Slot 1 Slot 1 Slot 1 Group 1 Slot 1 Slot 1 Slot 1 Slot 1 Group 2 Slot 2 Slot 2 Slot 2 Slot 2 Group 3 Slot 2 Slot 2 Slot 2 Slot 2 LogicalGr
174. l Rack 1Device Inhibit Word 17 Logical Rack 2 Device Inhibit Word 18 Logical Rack 3 Device Inhibit Word 19 Not Defined Starting Group 6 4 2 0 15 14 13 12 11 10 9 8 d 6 5 4 3 2 1 0 MO File x x x x x x x x x x x x 0 0 0 0 M0 e 16 x x x x x x x x x x x x 0 0 0 17 x x x x x x x x x x x x 0 0 0 0 18 0 0 M0 e 19 GFile Device Address Word 1 MO Control File Bit Number decimal Logical Rack 0 Device Inhibit Word 16 Logical Rack 1Device Inhibit Word 17 Logical Rack 2 Device Inhibit Word 18 Logical Rack 3 Device Inhibit Word 19 e slot number of the SLC rack containing the scanner X bit not used defined Example of Device Reset Control The application has commanded the device starting at Logical Rack 0 Group 0 M0 e 16 0 to a reset condition bit set to 1 The default setting for all device reset bits is 0 RIO Logical Rack 3 RIO Logical Rack 2 RIO Logical Rack 1 RIO Logical Rack 0 Starting Group Starting Group Starting Group Starting Group 6 4 2 0 6 4 2 6 4 6 4 2 0 0 0 1 0 0 0 1 0 0 0 1 0 0 1 15 14 13 12 11 10 9 8 7 6 5 4 3 N MO File x x x x x x x 0 0 0 1 0 16 x x x x x 0 0 0 0 M0 e 17 x x ES x x x 0 0 0 M0 e 18 x x x x x x x x x 0 0 0 o M0 e 19 e slot number of
175. le B3 5 B3 6 COP Jt Copy File 6 6 Source N16 0 Dest 0 1 4268 Length 128 B3 7 L 6 Unlatch the virtual DTCW bit for Data Block 7 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 7 when B3 7 6 has been unlatched the BSN module is ready for the next data transfer via Data Block 7 B3 6 B3 7 sd CU dr ad 6 6 This rung monitors the DTCW and DTSW bits for Data Block 8 When a transfer of data using Data Block 8 is not in progress copy up to 128 words to the appropriate M file location for Data Block 8 in the BSN module B3 5 B3 6 COP jt jt Copy File 7 7 Source N16 128 Dest 0 1 4396 Length 128 B3 7 ab 7 Unlatch the virtual DTCW bit for Data Block 8 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 8 when B3 7 7 has been unlatched the BSN module is ready for the next data transfer via Data Block 8 B3 6 B3 11 c 7 7 This rung monitors the DTCW DTSW bits for Data Block 9 When a transfer of data using Data Block 9 is not in progress up to 128 words to the appropriate M file location for Data Block 9 in the BSN module B3 5 B3 6 COP E Jt Copy File 8 8 Source N17 0 Dest 0 1 4524 Length 128 B3 7 L 8 Unlatch the virtual DTCW bit for Data B
176. lears the status flags These fields are only updated when the scanner has processed a BT operation as indicated by the DN or ER flag For example if there was a problem with a BT operation the error code will remain in the M1 BT buffer until the next BT operation causes it to be changed cleared if DN is set or an error code if ER is set Therefore the SLC control program should precede the examination of the error code field with the ER flag Publication 1747 6 22 7 116 RIO Block Transfer Publication 1747 6 22 Block Transfer Timing Diagrams The following pages contain timing diagrams that illustrate the effects of different control flags on a BT operation Successful Block Transfer Control 1 E MO Control Information 4 i Successful Block Transfer Read Write This example illustrates a successful BT operation 1 The SLC control program fills in the MO BT output control buffer and sets the enable EN flag The scanner detects that the EN flag is set validates the control information puts the BT request on the RIO link successfully and since no other BTs are pending for the same logical rack sets the enable waiting EW and start ST flag in M1 status field The scanner receives a BT reply with no errors from the RIO link device fills in any requested BTR data and sets the done DN flag The SLC control program de
177. link G file The SLC file used to configure the scanner You enter configuration information into this file during SLC processor programming This file is loaded to the scanner by the SLC processor upon entering run mode High Speed Serial Link HSSL 2 Mbit second link between primary and secondary BSN modules to provide the secondary SLC processor with input block transfer and user retentive data Network status and control information are also transferred between BSN modules on this link Inhibit A function by which the scanner stops communicating with a logical device The logical device considers itself inhibited if it does not receive communications from the scanner within a certain period of time Input file The scanner s input image file that is updated during the SLC processor input scan Local Expansion Chassis A chassis that is connected to a local SLC chassis using a 1747 C9 91 4 cm 36 in or 1747 C7 15 2 cm 6 in cable Local SLC Chassis The chassis that contains the SLC processor and scanner Logical Device Any portion of a logical rack that is assigned to a single adapter Adapters may appear as more than one logical device Logical Group A logical group consists of one input and one output word within a logical rack A word consists of 16 bits each bit represents one terminal on a discrete I O module Logical Rack A fixed section of the scanner image comprised of eight
178. lity of backing up a large number of I O points a backup system supports up to eight 1747 BSN modules in each processor chassis linked by a local status link LSL The high speed serial link HSSL has the following functionality Send the network commands from the primary to the secondary 1747 BSN and the replies from the secondary to the primary when the communication channel is configured as DH Transfer a limited number of SLC 5 0x data table files from primary to the secondary processor This data table transfer is done through an application program in the SLC 5 0x processor Although data transfer between the primary and secondary processors is done as fast as possible there is no guarantee that a switchover from the primary to the secondary will be bumpless The data rate is 2 Mbits second The local status link abbreviated LSL is a 57 6 KBaud serial link provided for exchanging status between the 1747 BSNs that are in the same chassis Data Transfer During normal operation the primary system sends remote input and retentative data table data to the secondary system so that in the event of a switchover the secondary system which becomes the new primary system has the same data Remote I O data is automatically transferred over the High Speed Serial Link This transfer is independent of the application program Each 1747 BSN is capable of transferring up to 2 KWord of the SLC 500 data table This capacity is inc
179. lock 9 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 9 when B3 7 8 has been unlatched the BSN module is ready for the next data transfer via Data Block 9 B3 6 B3 7 J Ps iE 8 8 This rung monitors the DTCW DTSW bits for Data Block 10 When a transfer of data using Data Block 10 is not in progress copy up to 128 words to the appropriate M file location for Data Block 10 in the BSN module B3 5 B3 6 COP 4 Copy File 9 9 Source 3N17 128 Dest 0 1 4652 Length 128 B3 7 9 Unlatch the virtual DTCW bit for Data Block 10 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 10 when B3 7 9 has been unlatched the BSN module is ready for the next data transfer via Data Block 10 B3 6 B3 7 A iE UD 9 Publication 1747 6 22 0021 0022 0023 0024 0025 0026 0027 0028 Programming Techniques 9 175 This rung monitors the DTCW and DTSW bits for Data Block 11 When a transfer of data using Data Block 11 is not in progress copy up to 128 words to the appropriate M file location for Data Block 11 in the BSN module B3 5 B3 6 COP Zt zt Copy File 10 10 Source N18 0 Dest 0 1 4780 Length 128 B3 7 CL 10 Unlatch the virtual DTCW bit for Data Block 11 when the comparable vi
180. lot Addressing Remote Chassis Publication 1747 6 22 Understanding Slot Addressing This section provides information about 2 slot addressing e 1 slot addressing e 1 2 slot addressing Understanding slot addressing is critical to most efficiently allocate your scanner s I O image files Slot addressing refers to how each remote chassis slot is assigned a specific amount of the I O image The amount depends on which type of slot addressing you choose at your adapter 2 slot 1 slot and 1 2 slot addressing is available as shown below Two slots are addressed as one logical group Input Image Output Image 15 8 7 0 15 8 7 0 Slot 2 Slot 1 Slot 2 Slot 1 One slot is addressed as one logical group Input Image Output Image 15 8 7 0 15 8 7 0 Slot 1 Slot 1 One slot is addressed as two logical groups Input Image Output Image 15 8 7 0 15 8 7 0 Slot 1 Slot 1 For more information on slot addressing refer to your ASB module user manual Note that slot addressing e g 1 2 1 and 2 slot may not apply to all types of RIO devices Refer to each RIO device s user manual to
181. m Canceling a BT Once Transmitted Across RIO Link This example illustrates an SLC control program cancelling a BT operation 1 In this example the SLC control program wants a BT timeout value less than the four second default value that the scanner uses When the SLC control program detects that the ST flag has set a timer in the SLC control program starts Ifthe timer expires before the scanner returns a BT response DN or ER then the program sets the TO flag The scanner fills in the error code field and sets the ER flag The SLC control program must still clear the EN flag to complete the BT operation Note that because of the asynchronous nature of cancelling a transmission to a device that has a BT in progress the BT reply may indicate either a successful completion or an The SLC control program clears the TO and EN flags Note that if the SLC control program later attempts to initiate another BT and the TO flag is still set the scanner ignores the BT request Finally the EW ST and ER bits are reset Publication 1747 6 22 7 120 RIO Block Transfer Publication 1747 6 22 SLC Control Program Cancelling a Block Transfer Prior To Transmission Across RIO Link ge 7 L DN SLC Control Program Canceling a BT Prior to Transmission Across RIO Link In this example the SLC control progr
182. m the secondary processor Node address n Node address 1 SLC500 BSN HSSL BSN SLC500 C E Data Table Transfer How the Backup System Operates DH Programming Device Each 1747 BSN is capable of transferring up to 2 KWord of the SLC 5 0x data table This capacity is increased as the number of 1747 BSN modules per chassis is increased in a redundant system For example a system with eight 1747 BSN s in each chassis is capable of transferring up to 16 KWord of synchronizing data table information The 2 KWord that can be transferred by a single module is divided into 16 blocks of 128 words that is equal to the maximum length of a COP instruction The address space M0 s 3500 through 0 5 5547 is used by the primary SLC 5 0x to send the data The address space M1 s 3500 through M1 s 5547 is used by the secondary SLC 5 0x to read the data from the secondary 1747 BSN In addition the address spaces 0 5 3400 through 0 5 3499 and M1 s 3400 through M1 s 3499 are used for status and control exchange between the SLC 5 0x and the 1747 BSN Some amount of support ladder program is necessary to make both modules operate properly in a backup system Both processors have a transmitter program and a receiver program At system startup the processor reads the Module Status Word MSW and the System Status Word SSW from the 1747 BSN to dete
183. methods 1 and 2 were designed to be used as sample methods In a real application the user would develop other methods of transferring data Theses alternatives would optimize the data transfer throughput without causing an excessive loss of time due to the M file transfers Publication 1747 6 22 9 180 Programming Techniques Accounting for Instructions That Could Cause Problems During Switchover Publication 1747 6 22 Some instructions may operate unpredictably when a switchover occurs if you fail to observe certain programming considerations For example you must consider transferring the control element and data elements for instructions that are also being executed in the secondary processor You also must consider transferring data files which contain more than one word The following instructions are discussed in this section timer counter logical arithmetic compare and move diagnostic sequencing file arithmetic and logic file search and compare file copy and fill FIFO and bit displacement block transfer message In the remainder of this chapter we describe the behavior of these instructions in the SLC 500 backup system Important The primary and secondary systems do not necessarily execute the same instructions at the same time the systems program scans are not synchronized Note also that the SLC 500 processor executes block transfers to the program scan asynchronously Therefore the
184. n ASB Backplane Scan 7 ASB Module 1 0 Module Scanner 7 1 0 Module Processor IN a 0 RIO Scan 4 Oi SLC Local Chassis Outputs to Modules msi Remote Chassis Remote Expansion Chassis i Inputs to Modules Outputs from Modules Inputs to Modules When the SLC control program detects that the remote input has been turned on via the scanner input image it activates the Output Devict remote output device the scanner output image Throughput is ther ime between when the remote input device is activated to when the remote output turns on is then defined as the Publication 1747 6 22 Calculating Throughput Specifications A 187 The 1747 BSN Backup Scanner s throughput is determined by using the formulas provided in this section Discrete I O Throughput without Block Transfers Present The information in this section is used to calculate the discrete throughput of the 1747 BSN Backup Scanner if there are no BTs occurring on the RIO link to any chassis If BTs are present on the RIO link you must use the Discrete I O Throughput with Block Transfers Present section to determine your throughput The formula to calculate the maximum backup scanner discrete I O throughput without BTs present is Tam nbt 2T ps 2T RIO TSNo TsNi Tia Tam nbt The maximum discrete throughput without BTs in milliseconds ms To calculate Ty
185. n Attempted Bit 5 20 RIO Baud Rate 5 20 Logical Device Starting Address Status 5 21 Logical Device Image Size Status 5 21 Active Device Status 5 22 Logical Device Fault Status 5 23 RIO Status Example 5 25 SLC Scanner Configuration 5 29 Chapter 6 System Status Word 6 2 Module Status Word 6 4 Transferring Data over the High Speed Serial Link OO OM POT E ER MN 6 5 Data Transfer Control Word 6 6 Data Transfer Status Word 6 7 Data Transfer Handshake Word 6 8 Program File 2 6 9 Publication 1747 6 22 viii Table of Contents Program File 3 EE et 6 10 Program 4 6 11 Switch Assemblies Status Word 6 12 Module Status Counters 6 13 Data Block Counters 6 14 Chapter 7 RIO Block Transfer RIO Block Transfer Theory of Operation 7 1 What Is RIO Block 7 1 RIO Block Transfer General Functional Overview 7 5 Scanner I O Image Allocation For Block Transfer 7 6 Examples of BT I O Image File Allocation
186. n an interface located in the secondary 1747 BSN module This remote input data includes discrete and analog data Automatic transfer of input image is carried out over the High Speed Serial Link HSSL and is independent of the application program The secondary 1747 BSN module responds with current data to the remote I O scan requests of the secondary processor making the secondary processor think that it is communicating with remote I O chassis This response prevents remote I O faults in the secondary processor since the secondary BSN module is not physically connected to the remote I O link In addition to providing the secondary processor a copy of the remote discrete input image table the 1747 BSN modules in both systems work together to provide the secondary processor a copy of block transfer data read from the remote I O chassis Publication 1747 6 22 4 52 Operating Your SLC 500 Backup System Publication 1747 6 22 The 1747 BSN automatically exchanges system status information when communicating with another 1747 BSN through the High Speed Serial Link HSSL Both modules are continuously communicating with each other even when both processors are not in Run mode This is achieved by sending and receiving the system status words This information can be read from either module at any time and provides for both SLC 5 0x primary and secondary the other side status HSSL is also used to transfer user data table data up
187. n requires It is important that you do not set either of these values to 0 If you do the scanner does not work correctly 7 Set the M0 MI and file sizes Using the Specialty I O Configuration menu set the M1 and MO file sizes to 32 words 48 words if using complementary I O 32 words is the minimum required for operation If you do not set the M1 and MO file sizes to at least 32 words the programming device does not allow you to access the M files in the SLC control program The maximum M file sizes are 5547 words for complete capability There is no penalty to set the M file lengths to this maximum Set the G file size to 3 5 if using complementary I O using the Specialty I O Configuration menu Write your ladder code to address discrete I O from the 32 input and output image words and the M files for control and status of the RIO network as well as block transfer and the HSSL if needed Refer to Appendix B MO M1 Files and Files on page B 1 before completing this selection 8 Go through the system start up procedure A Apply power B Download your program to the SLC C Place the SLC in Run mode The backup scanner s FAULT and ERROR LEDs are off the RIO LED is green the HSSL LED is blinking and the two PRI and SEC shows each processor Mode at this time This is the valid LED pattern when in Run mode or after a Run mode to Program mode transition Publication 1747 6 22 2 44 Quick Start for Experienced Us
188. nable bit then wait for the SN module to turn off the done error bit before another BTR to the same M file location can be initiated This is one complete BTR cycle VIRTUAL BTR DONE CHECK BTR VIRTUAL BTR ERROR Publication 1747 6 22 7 140 RIO Block Transfer Rung 2 3 Copy the BTW status area to an integer file only when a BTW is in progress This status data is then used throughout the program and limits the number of M file accesses BTW BTW PENDING STATUS B3 COP COPY FILE 1 Source 1 1 200 Dest N7 64 Length 4 CHECK BTW STATUS B3 dues a 3 Rung 2 4 Unlatch the bit that continues to check the BTW status When a BTW is complete the done or error bitis set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done error bit before another BTW to the same M file location can be initiated This completes one BTW cycle VIRTUAL BTW DONE CHECK BTW VIRTUAL BTW ERROR Publication 1747 6 22 RIO Block Transfer 7 141 When a BTR successfully completes buffer the BTR data and unlatch both the BTR virual enable bit and the BTR pending bit Also latch the bit that continues checking the BTR status until the SN module turns off the done bit VIRTUAL BIT BTR DATA FILE
189. nd System Status Word SSW 3400 3400 Module Status Word MSW 3401 3401 Switch Assemblies Status Word SASW 3402 3402 Reserved 3403 3409 Data Transfer Status Word DTSW 3410 3410 Reserved 3411 3419 Module Status Counters 3420 3426 Reserved 3427 3429 Data Block Counters 3430 3445 Reserved 3446 3499 Publication 1747 6 22 6 90 Module Control and Status Word System Status Word The System Status Word SSW presents a synthesis of the backup system status The primary objective of this word is to provide a fast way to see if the system is working well The status words described in the following sections provide additional details about the BSN module and system The SSW status bits have the following meaning 5 14 13 12 11 10 9 8 7 5 4 3 1 6 2 0 MLEs340 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 gt HSSL LSL g Buffer Full System Ready to Switch Over Remote I O Communication p gt Processor Fault We Primary System p gt Secondary System p DM d Number of BSN Modules p p gt Reserved p gt Reserved p gt Reserved p gt Switchover Diagnostic HSSL High Speed Serial Link status This bit is set when the HSSL is faulted or when it has communication errors in one or more 1747 BSN module in the backup system The normal state of this bit is OFF LSL Local Status Link status This bit is set when t
190. ndicate that it has received the last data via data Block 322 when B3 7 1 has been unlatched the BSN module is ready for the next data transfer via Data Block 2 Virtual DTSW Bit for Virtual DTCW Bit for Data Block 2 Data Block 2 B3 6 B3 7 0004 4h CUD 1 1 This rung copies the Virtual DTCW word B3 7 to the actual DTCW word M0 1 3410 located in the 1747 BSN module M file accesses are interrupts to the processor and using virtual words minimizes M file accesses and therefore minimizes the effects of these transfers on the ladder program scan time Virtual amp Actual DTCW Word MOV 0005 Move Source B3 7 0000000000000000 lt Dest M0 1 3410 lt 0006 CEND gt Publication 1747 6 22 6 100 Module Control and Status Word Switch Assemblies Status Word 1514 13 12 11 109 8 7 6 5 The Switch Assemblies Status Word SASW shows the switch assemblies configuration status for both the six position SW1 and the four position SW2 dip switch Bits 0 through 3 show the four position dip switch status while bits 8 through 13 show the six position dip switch status 3 2 1 O0 MLs 3402 TO 0 0 4 0100001000100 0 ee SW 2 1 SW 2 2 4 pos dip switch SW 2 3 status SW 2 4 Reserved status p SW 12 EE Ne 6 pos dip switch p SW 1 5 Publication 1747 6 22
191. ng 2 2 Unlatch the bit that continues to check the BTW status when a BTW is complete the done bit is set The ladder program must then unlatch the enable bit Then wait for the SN module to turn off the done bit before another BTW to the same M file location can be initialized This is one complete BTW cycle CHECK BTW VIRTUAL STATUS BTW DONE UNTIL DONE BIT BIT IS OFF B3 0 B3 5 epe farni a a U 1 1 VIRTUAL BTW ERROR BIT B3 0 pese flee 12 Rung 2 3 When a BTW successfully completes unlatch the BTW enable bit Also unlatch the BTW pending bit and latch the bit that continures checking the BTW status until the SN module turns off the done bit SERVICE THE BTW VIRTUAL STATUS BTW DONE BTW BIT PENDING B3 0 B3 5 VIRTUAL BTW ENABLE BIT CHECK BTW STATUS UNTIL DONE BIT IS OFF Publication 1747 6 22 7 128 Rung 2 4 RIO Block Transfer If a BTW errors unlatch the enable bit the BTW pending bit and buffer the BTW error code Also latch the bit that continues checking the BTW status until the SN module turns off the error bit VIRTUAL BTW ERROR BIT Rung 2 5 BUFFER BTW ERROR CODE MOVE B3 3 0000000000000000 Dest B3 4 0000000000000000 SERVICE THE BTW STATUS BIW PENDING VIRTUAL BTW ENABLE BIT CHECK BIW STATUS UNTIL DONE BIT IS OFF B3 5
192. ng monitors the DTCW and DTSW bits for Data Block 3 When a transfer of data using Data Block 3 is not in progress co py up to 128 words to the appropriate M file location for Data Block 3 in the BSN module B3 5 B3 6 COP Zt 26 Copy File 2 2 Source N14 0 Dest 0 1 3756 Length 128 B3 7 L 2 Unlatch the virtual DTCW bit for Data Block 3 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 3 when B3 7 2 has been unlatched the BSN module is ready for the next data transfer via Data Block 3 B3 6 B3 7 ca 4 Es CUP 2 2 This rung monitors the DTCW and DTSW bits for Data Block 4 When a transfer of data using Data Block 4 is not in progress copy up to 128 words to the appropriate M file location for Data Block 4 in the BSN module B3 5 B3 6 COP YE JE Copy File 3 3 Source N14 128 Dest 0 1 3884 Length 128 B3 7 T 3 Unlatch the virtual DTCW bit for Data Block 4 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 314 when B3 7 3 has been unlatched the BSN module is ready for the next data transfer via Data Block 4 B3 6 B3 7 c pe CU PES etd 3 3 This rung monitors the DTCW and DTSW bits for Data Block 5 When a transfer of data using Data Block 5 is not in progress copy up to 128 words to the appropriate M f
193. nner ERR Scanner Image SLC Input input DEUS 3 Device 1 RIO Scanner Scan Cycle mageFile Image File pes N Inout n A Output i mage Image Program Device 3 Devise 1 s a Output nput Image Image The scanner updates its input Device 24 Device 2 image file each time it scans a N Ee BEEN logical device The scanner EE scan all of its configured d logical devices several times Scanner before the SLC processor SLC Output Output Image reads the scanner s input SLC Processor Image file image file Important The outputs of the RIO are updated after the end of the first SLC processor scan Publication 1747 6 22 1 22 Overview How the Scanner Interacts with Adapters Processor Scanner SLC Local Chassis Publication 1747 6 22 The scanner s function is to continuously scan the adapters on the RIO link in a consecutive manner This scan consists of one or more RIO discrete transfers to each adapter on the RIO link RIO discrete transfers consist of the scanner sending output image data and communication commands to the adapter that instruct the adapter on how to control its output These include run adapter reset and reset decide commands The adapter responds by sending input data to the scanner The scanner per
194. nstruction containing an M1 file bit word or file is scanned by the processor an immediate data transfer to the module occurs and will impact the overall processor scan time SERVICE THE BTR STATUS BTR PENDING BTR STATUS B3 5 COP FILE 0 Source M1 1 100 Dest B3 0 Length 4 4p t CHECK BTR STATUS UNTIL DN OR ER BIT IS OFF B3 5 4 1 Rung 2 2 Unlatch the bit that continues to check the btr status When BTR is complete the done bit is set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done bit before another BTR to the same M file location can be initiate This is one complete BTR cycle CHECK BTR STATUS VIRTUAL UNTIL DN BTR DONE OR ER BIT BIT IS OFF B3 0 B3 5 13 1 VIRTUAL BTR ERROR BIT B3 0 A 12 Publication 1747 6 22 RIO Block Transfer 7 125 Rung 2 3 When a BTR successfully completes buffer the BT data and unlatch the BT enable bit Also unlatch the BTR pending bit and latch the bit that continues checking the BTR status until the SN module turns off the done bit VIRTUAL BTR DONE BIT BTR DATA COPY FILE 13 Source M1 1 110 Dest N7 10 Length 64 SERVICE THE BIR
195. o inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 14 Virtual DTSW Bit for Data Block 14 B3 3 COP 0014 4 E Copy File 13 Source 1 1 5164 Dest N18 128 Length 128 Virtual DTHW Bit for Data Block 14 B3 4 y X Ld 13 This rung copies the new Data Block 15 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 15 B3 4 14 M0 1 3411 14 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 15 Virtual DTSW Bit for Data Block 15 B3 3 COP 0015 jk Copy File 14 Source 1 1 5292 Dest N19 0 Length 128 Virtual DTHW Bit for Data Block 15 B3 4 a rd 14 This rung copies the new Data Block 16 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 16 B3 4 15 M0 1 3411 15 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 16 Virtual DTSW Bit for Data Block 16 B3 3 COP 0016 jk Copy File 15 Source M1 1 5420 Dest N19 128 Length 128 Virtual DTHW Bit for Data Block 16 B3 4 15 Publication 1747
196. ons Publication 1747 6 22 Chapter Objectives Getting Started Chapter 9 Programming Techniques Read this chapter to familiarize yourself with techniques used to program your SLC 500 backup system In this chapter we describe how to get started with a program to transfer data table values two methods you can use to program the SLC 500 backup system to transfer data table values the behavior of specific instructions when used in your application program and give you suggestions for dealing with these instructions The 1747 BSN modules control switchover and transfer remote I O data without additional programming However if you want to transfer data table values from the primary to the secondary processor you must provide a ladder program The following figure shows the minimum ladder programming you must provide to transfer 2 Kwords of the data table between the two 1747 BSN modules and to provide 1747 BSN module status This program constantly transfers data as fast as possible 2K words is the maximum per BSN module on the HSSL With no local I O a 5 02 or later processor supports up to 8 BSN modules for a maximum of 16K words of retentive data transfer from primary processor to secondary processor Refer to the following section Data Transfer Schemes for alternative approaches You need to put this program in both processors Publication 1747 6 22 9 166 Programming Techniques Program File 2
197. ons involved in the link and the number of messages received and or transmitted This time is typically less than 50 ms per station However while the link is rebuilding messages can collide increasing the amount of time needed to reconstruct the link As a result on a typical DH link with 6 10 stations the impact on the link due to switchover could be the loss of communication for as much as 1 3 seconds DH switching occurs whenever there is a transfer of control from the primary to the secondary processor The switchover could result from a power failure or because of other system failures The table below shows what can happen to the link if the token is lost Important Note that when a transfer of control from the primary to the secondary processor occurs the processor that is now primary has the node address of n on the link The processor that is now secondary has the node address of n 1 the following could occur causing this result The source station turns on error bit in its MSG instruction You provide programming at the source station to regain synchronization with the receiving station You can do this by monitoring the message instruction error bit as a condition for retransmitting the message Reply packet disrupted Same as above Token pass packet disrupted The DHs link times out and must rebuild 250ms watchdog timeout 50 ms x number of stations on the link Listening to the link
198. ords are copied from B3 0 to MO 1 0 Therefore this adds 24360 us to the scan time of the COP instruction If you are using a SLC 5 02 Series C processor add 950 us plus 400 us per word This adds 14550 us to the scan time of the COP instruction SLC 5 03 Processor Example COP COPY FILE Source B3 0 Dest M0 1 0 Length 34 The SLC 5 03 processor access times depend on the instruction type Consult the table on B 5 for the correct access times to add As an example if you use a COP to M file instruction like the one shown above add 772 us plus 23 us per word This adds 1554 us to the SLC 5 03 processor scan time due to the COP instruction SLC 5 04 Processor Example COP COPY FILE Source B3 0 Dest M0 1 0 Length 34 The SLC 5 04 processor access times depend on the instruction type Consult the table on B 5 for the correct access times to add As an example if you use a COP to M file instruction like the one shown above add 735 us plus 23 us per word This adds 1517 us to the SLC 5 04 processor scan time due to the COP instruction Minimizing the Scan Time You can keep the processor scan time to a minimum by economizing on the use of instructions addressing the MO or M1 files For example XIC instruction 0 2 1 1 is used in rungs 1 and 2 of the figure below adding approximately 2 ms to the scan time if you are using a SLC 5 02 Series B processor 1 Files and G Files B
199. ot modify the Device Reset and Remote Output Reset words the device outputs reflect the scanner output image whenever the SLC processor is in Run mode If the SLC processor is in Program Test or Fault mode it instructs the device to reset its outputs If you modify the default settings the Device Reset and Remote Output Reset words change The table on the following page contains examples of what changes occur The information in the table is based on the assumption that the scanner s slot is always enabled and the RIO link device is communicating with the scanner To determine how the Device Reset and Remote Output Reset words operate locate the box where the row and column are headed by the modes in question The shaded boxes represent the Device Reset and Remote Output Reset word operation while in that mode Example 1 When powering up into Run mode the scanner by default resets the appropriate bit in the Device Reset word to 0 The appropriate bit in the Remote Output Reset word is set to 1 Asa result the RIO link device outputs reflect the scanner s output image Publication 1747 6 22 5 76 Power up Program Test Scanner Configuration and Programming Example 2 Once the SLC processor is in Run mode the bits in the Remote Output Reset word have no effect on the RIO link device s outputs Setting the appropriate bits in the Device Reset Word to 1 instructs the RIO link device to reset its outputs Example 3
200. oup4 5013 5013 Slt3 91013 Rack 0 Group5 Slot3 Slot3 Slot3 9013 Group6 Slot4 Slot4 Slot4 91014 Group7 Slot4 Slot 4 Slot4 Slot 4 phis Sus sos Slot Pair sots 35101 Pair Groupi Slt5 5015 Slt5 505 Group2 Slot Slot6 Slot 6 Slot 6 Group3 Slt6 5016 Slot6 5016 Logical Group4 Slt7 Slot 7 Slot 7 Slot 7 Rack 1 Group 5 Slot 7 Slot 7 Slot 7 Slot 7 Group6 Slt8 5018 Slot8 Slot8 Group 7 Slot8 Slot8 Slot8 51018 Publication 1747 6 22 1 32 Overview Complementary 1 0 Application Considerations If you configure a complementary device to use more I O image space than an associated primary device then block transfers can only be performed to locations in the complementary device that have associated I O image space in the primary device For example if a primary device is 1 2 logical rack and a complementary device is a full logical rack block transfers can be performed only in the first 1 2 logical rack of the complementary device Attempting block transfers in the last half of the complementary device results in a BT error error 11 device not configured Logical Word 2 Word 3 Wi Publication 1747 6 22 Word 0 1 2 logical rack contre and Wordi lt configured and usable Logical Word 2 usable Rack 8 org i 2 logical raok confi ure 1 2 logical
201. owing pages Note that the output images would be the same Example Scanner Input Image of the Primary Devices Below are the primary device addresses and sizes The following figure contains complementary device addresses and sizes Device 1 starting at Logical Rack 0 Logical Group 2 is a primary 3 4 logical rack device Logical Rack 1 Logical Group 0 contains no primary device Device 2 starting at Logical Rack 1 Logical Group 6 is a primary 1 4 logical rack device Device 3 starting at Logical Rack 2 Logical Group 0 is a primary 3 4 logical rack device Device 4 starting at Logical Rack 3 Logical Group 2 is a primary 1 4 logical rack device Device 5 starting at Logical Rack 3 Logical Group 6 is a primary 1 4 logical rack device ez slot number of the SLC chassis containing the scanner 14 e 0 e 1 2 e 3 16 4 16 5 1 6 16 7 68 e 9 e 10 e 11 e 12 10 13 e 14 10 15 e 16 16 17 16 18 6 19 16 20 e 21 16 22 10 23 16 24 10 25 16 26 16 27 16 28 6 29 e 30 e 31 178 163 153 148 133 123 118 103 78 68 5g 4g 33 28 18 Device 1 Device 2 Device 3 Device 4 Device 5 Publication 1747 6 22 5 66 Scanner Configuration and Programming
202. p System Publication 1747 6 22 How the SLC 500 Backup System Works 1 22 Chapter 2 Required Tools and Equipment 2 1 PROCS CUROS uisa edt 2 2 Chapter 3 Compliance to European Union Directives 3 1 EMC Directive 3 1 Configuration Selection 3 1 Baud Rate 5 3 2 Module Address Switch 3 2 Backup Scanner Installation 3 3 3 3 dea Do ad 34 3 4 Terminal 3 4 Status LEDS teers 3 6 Chapter 4 Chapter 4 1 How the 1747 BSN Module Operates 4 1 Automatic Transfer of Remote Input Data Over ie POSSE WEE RV Cds 4 1 RS 232 485 Communication Channel 4 2 RIO DH Communication Channel 4 2 Secondary Processor Remote Programming 4 4 Data Table Transfer 4 5 How the Backup System Operates 4 5 Primary 4 6 Secondary 4 6 Backup System Theory of Operation 4 6 Startup Sequencing 4 7 Power up Sequencing 4 7 Processor
203. peration starts an RIO system 4 second timer begins counting down You can program a timer in your SLC user program to cancel a Started bit 14 BT Publication 1747 6 22 7 114 RIO Block Transfer Detailed Operation of RIO Block Transfer Publication 1747 6 22 You use the 1747 BSN Scanner file BTR BTW output control buffers to set up and control BT operations Status information regarding the progress and completion of BTR BTW operations displays in corresponding 1 file input status buffers This section describes step by step how the RIO scanner uses files to accomplish block transfer operations The steps below are based on the following assumptions The size of the MO and MI files has already been set to 3 300 words You set the M file sizes while in off line programming mode No pending BT operation utilizing a particular MO output control and M1 status control buffer is in progress e Both the MO M1 control status buffers are completely empty Important Timing diagrams describing BT control and status flag operation follow this section 1 You set up a BTR or BTW by filling in control information about block transfer length logical rack logical group and logical slot address in an MO output control buffer If you want to set up a BTW then you must place your write data in the BTW data area of the MO output control buffer You set up MO buffer information in an integer file and a COP instru
204. procedures below ATTENTION Disconnect system power before attempting to install remove or wire the scanner Important Make sure you have set the DIP switches properly before installing the scanner Important Before installation ensure that your modular SLC power supply has adequate reserve current capacity The scanner requires 800 mA at 5V dc Insertion 1 Disconnect power 2 Align the full sized circuit board with the chassis card guides The first slot slot 0 of the first rack is reserved for the SLC 500 processor 3 Slide the module into the chassis until the top and bottom latches catch 4 Attach the RIO link cable to the connector on the front of the module behind the door Ground the cable s shield wire to a chassis mounting bracket Refer to the RIO link wiring illustration 5 Insert the cable tie in the slots 6 Route the cable down and away from module securing it with the cable tie 7 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Publication 1747 6 22 3 48 Installation and Wiring Publication 1747 6 22 Cable Tie Removal 1 Disconnect power 2 Remove all cabling 3 Press the releases at the top and bottom of the module and slide the module out of the chassis slot 4 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Wiring Terminal Wiring The Backup Scanner module contains a green removable terminal block The
205. processor dependent Scanner I O Image Division The scanner allows each adapter to use a fixed amount user defined of the scanner s input and output image Part of the SLC processor s image is used by local I O the other portion is used by the scanner for remote I O The scanner remote I O image is divided into logical racks and further divided into logical groups A full logical rack consists of eight input and eight output image words A logical group consists of one input and one output word in a logical rack Each logical group is assigned a number from 0 7 Local I O Remote I O Logical Group 7 Adapter Processor I O Image Scanner I O Image Image The scanner image contains the image of each adapter on the RIO link The adapter is assigned a portion of the scanner image which is referred to as the adapter image Publication 1747 6 22 1 20 Overview How the Scanner The scanner communicates with each logical device in a sequential Scans Remote I O fashion First the scanner initiates communication with a device by sending output data to the device The device then responds by sending its input data back to the scanner as illustrated below You refer to this exchange as a discrete I O transfer After the scanner completes its discrete I O transfer with the last configured network device it begins another discrete I O transfer with the first device It is important to understand that the scanner transfers RIO data
206. processor interrupts the program scan asynchronously to access block transfer write BTW and block transfer read BTR files Timer Instructions The SLC 500 processors maintain timers by keeping a copy of a hardware timer in a portion of the three word structure timer byte used by each timer Control byte Timer byte 1 Preset value Accumulated value 3 Programming Techniques 9 181 The hardware timer of the primary processor is completely asynchronous to the hardware timer of the secondary processor If the whole three word timer structure including the timer byte is transferred from the primary to the secondary processor during a switchover then the timer could encounter a large positive increment in the timer accumulated value The worst case increment may be as much as 2 55 seconds Follow the guidelines below to help avoid this type of increment in the timer accumulated value do not send the first word of the timer control structure transfer only the accumulated value Transfer the preset value also if you need to change it Even though both processors are executing the same programs your program should transfer the timer accumulated value from the primary processor to the secondary processor at least once after you start the backup system switch the secondary SLC 500 from PROGRAM to RUN mode restart a repaired system This allows the accumulated value in the secondary pro
207. put data between itself remote adapters and the SLC processor Remote adapters consist of 4 746 chassis and other Allen Bradley operator interface and control evices Li 1 Adapter 1 Adapter 2 Adapter 3 Adapter 4 B Adapter 5 eper T Half Logical Quarter Logical Half Three Quarter Full Full Rack Rack Logical Rack Logical Rack Device Logical Rack Logical Rack Device Device Device Device Device Publication 1747 6 22 Overview 1 19 The SLC processor transfers the scanner s 4 logical racks 32 input image and 32 output image words of discrete remote I O image data into the SLC input and output image files You can adjust the size of the scanner input and output image file during configuration of your SLC system so that the scanner only transfers the discrete I O data your application program requires Configuration is done through the configuration file G file Refer to chapter 4 Configuration and Programming for more information Important The SLC 500 processor SLC 5 02 or later supports multiple scanners in its local I O chassis The maximum number is dependent on the following backplane power requirements power supply dependent SLC 500 processor I O data table limit 4 096 I O Based on SLC processor I O capacity only a maximum of eight scanners may be used when no local I O exists processor memory to support the application SLC 500
208. quencing File Arithmetic and Logic File Search and Compare File Copy and Fill Instructions The type of data you are transferring as well as how you transfer the data to the secondary processor determines the behavior of the following file instructions File Arithmetic and Logic instructions FAL File Search and Compare FSC File Copy COP File Fill FLL Diagnostic FBC and DDT You should place the instruction s control element data file within the same 62 words of data If this 15 not done the 1747 BSN module could transfer the control values responsible for control of the file at a different point than when it transfers the file A time lag between when the file is updated and when the associated control element is updated in the secondary processor As a result the following may occur during switchover file operation that was running may be off by one word a Word could be operated on by the file twice a Word could not even be operated at all FIFO and Bit Displacement Instructions The type of data you are transferring as well as how you transfer the data to the secondary processor determines the behavior of the FIFO and Bit Displacement instructions If you are transferring only selected areas of the data files which do not include data for FIFO and bit instructions the instructions are executed normally Programming Techniques 9 183 However if you are transferring all of the data table file
209. r not responding to communications Or A 1 indicates that the configured configured to an incorrect logical rack size device is active Logical Device Fault Words 12 through 15 bits 0 to 7 indicate the device fault status for logical racks 0 1 2 3 8 9 10 and 11 Bits 0 through 3 are for primary normal devices and bits 4 through 7 are for complementary devices Each bit corresponds to a quarter logical rack location If a device is not responding to communications has gone offline or is configured to an incorrect logical rack size all bits corresponding to the device are set to 1 This is highlighted in the example below Status Publication 1747 6 22 5 82 Scanner Configuration and Programming M1 Status File Primary Normal Device Fault Status Bit Number decimal Primary Device Address Word 8 Primary Device Size Word 9 Primary Active Device Status Word 10 The information contained in words 8 9 and 10 indicates a 3 4 logical rack device beginning at Logical Rack 3 Logical Group 2 is faulted or configured to an incorrect logical rack size This device status is confirmed in bits 1 2 and 3 of Device Fault Status Word 15 Logical Rack 0 Device Fault Status Word 12 Logical Rack 1 Device Fault Status Word 13 Logical Rack 2 Device Fault Status Word 14 Logical Rack 3 Device Fault Status Word 15 Bit Number decimal Primary Device Address Word 3 Primary Device Size Word 4 Primary Active Device Status Word 5
210. r s control program executes a MOV or COP instruction to the MO file to initiate a BTW The SLC processor sends BTW data via the chassis backplane to the scanner s MO block transfer control and write data file Refer to the Block Transfer Buffer Layout section for details on control information 2 The scanner reads the BTW data and control data from the MO file One byte of the scanner s I O image file is used for handshake purposes Note that the SLC user program must never read or write to this image space 3 The M1 file contains BTW status information Refer to the Block Transfer Buffer Layout section for details on status information 4 The RIO scanner transfers BTW information across the RIO link to the adapter 5 The adapter transfers the BTW information to the appropriate adapter or intelligent I O module Publication 1747 6 22 RIO Block Transfer General Functional RIO Block Transfer 7 107 The RIO scanner performs block transfers through control status buffers that you allocate in the scanner s and files For BT Ws the MO BT buffer contains BTW control data and BTW data while a Overview corresponding M1 BT buffer contains only BTW status information g y For BTRs the MO BT buffer contains only BTR control data while a corresponding M1 BT buffer contains BTR status information and BTR data Block transfers occur asyn
211. r to a logical device during an RIO discrete transfer These commands instruct the logical device to reset all of its discrete outputs regardless of the hold last state selection RIO Block Transfer The exchange of up to 64 words of data between the scanner and a remote device RIO block transfers only occur if you program them in your processor control program RIO Discrete Transfer The exchange of image data between the scanner and adapter RIO discrete transfers occur continuously whenever the scanner and adapter are communicating on the RIO link RIO Link An Allen Bradley communication system supporting high speed serial transfer of Remote I O RIO control information This link consists of one master and one or more slaves RIO Link Device Refers to any Allen Bradley or licensed third party product that connects to the RIO link as an adapter or slave device Scanner The Catalog Number 1747 SN Remote I O Scanner which is the master on the RIO network Scanner Image The data table area within the scanner used to exchange I O information between the scanner and all the adapters on the RIO link The scanner image is a portion of the SLC processor image Publication 1747 6 22 214 Glossary Publication 1747 6 22 SLC Chassis physical SLC rack that houses SLC processors and 1746 and 1747 I O modules SLC Processor The processor that controls the SLC chassis in which the scanner is installed
212. rack not Word 5 Words 47 are not configured Word 6 configured for the primai Word 7 device Complementary 1771 I O Module Details Use the following modules in either primary or complementary I O chassis opposite any type of module Communication Adapter Module 1771 KA2 Communication Controller Module 1771 KE PLC 2 Family RS 232 C Interface Module 1771 KG Fiber Optics Converter Module 1771 AF DH DH Communication Adapter Module 1785 K A DH RS 232C Communications Interface Module 1785 KE Use the following modules in either primary or complementary I O chassis opposite any type of module However these modules do not work as standalone modules each one has an associated master module Use care when placing the master modules in the I O chassis Analog Input Expander Module 1771 E1 E2 E3 Analog Output Expander Module 1771 E4 Servo Encoder Feedback Expander Module 1771 ES Pulse Output Expander Module 1771 OJ Hardware Features Overview 1 33 Note the backup scanner s hardware features in the following Status LEDs High Speed Serial Link HSSL illustration BACKUP SCANNER PRO ESEC ERRE ORIO 9 Local Status Link LSL amp 9 amp E Q JE amp Stat
213. reased as the number of 1747 BSN modules per local chassis is increased in a redundant system For example a system with eight 1747 BSNs in each chassis is capable of transferring up to 16 KWord of synchronizing data table information Overview 1 39 Data table values are transferred from the primary to the secondary system with MO and MI files and the HSSL You copy the data to and from M files via your ladder program You do not have to transfer data table values if not necessary for your application For detailed information about data transfer from the primary to the secondary system refer to Chapter 5 Operating Your SLC 500 Backup System Switchover Should a fault occur in the primary processor control switches to the secondary system in less than 50 ms maximum When a switchover occurs the outputs in the remote I O maintain their last state until they come under the control of the secondary processor The program scans of the two processors are not synchronized This means that the secondary processor may be in a different place in the scan cycle than the primary processor This manual explains the switchover process and provides guidelines for developing programs for your SLC 500 backup system For more information about switchover refer to Switchover Considerations on page 8 1 Role of the 1747 BSN Module As an integral part of the backup system the 1747 BSN modules enable high speed communication between th
214. rement the module counter restart the data block counter and repeat step 3 Repeat this step until all possible data blocks are scanned 4 Copy the data block from the SLC 5 0x to the 1747 BSN module indicated by the module counter 5 Advise the 1747 BSN module that the data block is ready through the DTCW set the bit corresponding to the data block in this word 6 Increment the data block counter and check whether it is time to select the next 1747 BSN module If it is time to select the next module increment the module counter and restart the data block counter 7 Start step 1 in the next program scan Publication 1747 6 22 9 178 Programming Techniques Publication 1747 6 22 To receive the data blocks the secondary SLC 5 0x application program uses the following procedure 1 Read all the DTSWs from the respective 1747 BSN modules 2 Clear all DTHW bits corresponding to the data blocks that were previously read and that no longer have a data ready bit set for them in the DTSWs Send all the DTHWSs to their respective 1747 BSN modules 3 Look at the counters and DTSWs to check whether the next data block that is received is ready in the 1747 BSN module f the next data block is not ready increment the data block counter and check whether it is time to select the next 1747 BSN module If the next data block is ready increment the module counter restart the data block counter and repeat step 3 Repeat th
215. removing forces remove forces in the secondary processor before removing the forces in the primary processor If a switchover occurs and forces were not set in the secondary processor first the secondary processor does not recognize the forced on input or output Publication 1747 6 22 8 160 Switchover Considerations Data Highway Plus Switching Publication 1747 6 22 The user can aggregate a 1747 BSN with the communication channel configured as DH network to the system In this situation both primary and secondary processors must be set to the same node address During normal operation the other equipment in the DH network recognize the primary processor in its real node address and the secondary processor in the node address which follows When a switchover occurs the new primary SLC 5 04 assumes its real node address in the DH network and the new secondary processor assumes the next node address The DH smart switch is designed to provide remote programming capability for the secondary processor with the following limitations The secondary SLC 5 04 can be accessed only by one station in the primary link each time If more than one station tries to access the secondary SLC 5 04 at the same time the communication performance with this node is degraded significantly The secondary SLC 5 04 only communicates with the secondary 1747 BSN If a third device is connected to this link it will not work properly The s
216. rete I O Throughput without Block Transfers Present 4 Discrete I O Throughput with Block Transfers dm bt Pr sent uou ird esi ea te Ged bea A 6 Determining TSNo bt 6 Determining OKC A 7 Example Discrete I O Throughput with Block Transfers PRESEN a nae a eL A 7 Block Transfer Throughput A 9 Backup Scanner Output Delay Time TSNo Tables A 11 Determining the Number of Logical Racks 11 MUSMERI BS 5 1 ERE T 1 Configuring MO M1 Files 1 Addressing MO M1 Files B 2 Using MO M1 Data File Addresses B 2 Monitoring Bit 0 5 5 B 3 1 Monitoring Option Disabled B 3 1 Monitoring Option Enabled 4 Transferring Data Between Processor Files and or M1 4 Access Time vus 5 SLC 5 02 Processor B 5 SLC 5 03 Processor Example B 6 SLC 5 04 Processor B 6 Minimizing the Scan Time B 6 Capturing MO M1 File Data B 7 Specialty Modules with Retentive Memory B 8
217. rimary system is powered down first a switchover occurs A failed system that has been repaired can be restarted as described in the following sequence It is not necessary to power down or change the mode of primary SLC 5 0x 1 Set the secondary SLC 5 0x processor of the repaired system to program mode 2 Apply power to the secondary system 3 Download the applications program to the secondary SLC 5 0x 4 Change the backup processor mode of operation from Program mode to Run mode Understanding Remote Input and Output Image Files Logical Rack 0 Group 0 Logical Rack 0 Group 1 s Logical Rack 0 Group 2 Logical Logical Rack 0 Group 3 Rack 0 Logical Rack 0 Group 4 Logical Rack 0 Group 5 Logical Rack 0 Group 6 Logical Rack 0 Group 7 Logical Rack 1 Group 0 Logical Rack 1 Group 1 a Logical Rack 1 Group 2 Logical Logical Rack 1 Group 3 Logical Rack 1 Group 4 Rack 1 Logical Rack 1 Group 5 Logical Rack 1 Group 6 Logical Rack 1 Group 7 Logical Rack 2 Group 0 Logical Rack 2 Group 1 Logical Rack 2 Group 2 Logical Logical Rack 2 Group 3 Rack 2 Logical Rack 2 Group 4 Logical Rack 2 Group 5 Logical Rack 2 Group 6 Logical Rack 2 Group 7 Logical Rack 3 Group 0 Logical Rack 3 Group 1 Logical Rack 3 Group 2 Logical Logical Rack 3 Group 3 Logical Rack 3 Group 4 Rack 3 Logical Rack 3 Group 5 Logical Rack 3 Group 6 Logical Rack 3 Group 7 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7
218. rmine its state If the processor is in the primary state it executes the transmitter program If the processor is in the secondary state it executes the receiver program Publication 1747 6 22 4 56 Operating Your SLC 500 Backup System Publication 1747 6 22 Primary Program Each data block that can be transferred from the primary to secondary SLC 5 0x is identified by its address in the MO M1 files The application program must transfer each block using the following procedure A instruction is used to get the Data Transfer Status Word DTSW and to see if the block can be transferred from the SLC 5 0x to the 1747 BSN if the data block status bit is clear When this bit is clear the new data block must be copied to this corresponding MO address Then the data block control bit in the Data Transfer Control Word DTCW must be set to advise the 1747 BSN that this new data block is ready to transfer to the secondary system This bit must be held set until the corresponding bit in the DTSW is set by the 1747 BSN The bit must then be cleared Secondary Program For each block that can be received by the secondary SLC 5 0x its application program must do the following procedure A MOV instruction is used to get the Data Transfer Status Word DTSW and to see if new data for the block is ready for reading in the secondary 1747 BSN module When this bit is set the new data block must be copied from the 1747 BSN M1 file Then it
219. rogramming techniques or system installation requirements If you have any questions or are unfamiliar with the terms used or concepts presented in the procedural steps always read the referenced chapters and other recommended documentation before trying to apply the information This chapter tells you what tools and equipment you need lists preliminary considerations describes when to address configure and program the module explains how to install and wire the module discusses system power up procedures Have the following tools and equipment ready medium blade screwdriver programming equipment termination kit package of resistors and ring lug included with the scanner approximately 15 inches of 20 AWG for grounding the drain shield to the SLC chassis for Series A retrofits an adequate length of RIO communication cable Belden 9463 for your specific application Publication 1747 6 22 2 42 Quick Start for Experienced Users Procedures 1 Ensure your chassis supports placement of the 1747 BSN module Review the power requirements of your system to see that your chassis supports placement of the scanner module The scanner consumes 800 mA at 5V dc 2 Configure the module using the DIP switches Set the DIP switches located on the printed circuit board The six position Configuration DIP Switch is used to select the baud rate configure the communication channel and identify each BSN module
220. roup 7 Slot 0 70 M0 e 103 through M0 e 109 These words are reserved 0 110 through 0 173 BTW data Words 0 through 63 Publication 1747 6 22 MO File BT Control Buffer Layout RIO Block Transfer 7 111 Important The buffer layout below is the same for all 32 BT buffers Buffer 1 0 100 buffer 32 M0 e 3200 BT Control Buffer Function Control Flags See Control Flag MO Address where x buffer from 1 to 32 Definitions table below MOE XON BT Length 0 through 64 01 BT Address logical rack group and slot M0 e x02 Reserved M0 e x03 through M0 e x09 BTW Data Locations 0 through 63 M0 e x10 through M0 e x73 BT Control Flag Definitions Definition These bits are reserved Control flags where x buffer from 1 to 32 M0 e x00 0 through M0 e x00 6 Type of BT operation 1 BTR and 0 BTW 0 00 7 Block Transfer Timeout TO 1 Cancel the BT operation 0 00 8 These bits reserved M0 e x00 9 through M0 e x00 14 Block Transfer Enable EN 1 Enable the BT operation 0 00 15 1 Bit 7 indicates whether the SLC control program is initiating BTR or a BTW 2 You set bit 8 timeout bit TO 1 to cancel a BT You can cancel a BT operation by timing out once the Enabled Waiting EW bit sets and before the RIO scanner s internal four second BT timer times out or the BT comple
221. rs and therefore will impact the overall processor scan time BTR PENDING BTR STATUS B3 gt pS Se EU COPY FILE 80 Source M1 1 100 Dest B3 0 Length 4 CHECK BTR STATUS B3 81 Rung 2 2 Unlatch the bit that continues to check the BTR status When a BTR is complete the done or error bit is set The ladder program must then unlatch the enable bit then wait for the SN module to turn off the done error bit before another BTR to the same M file location can be initiated this is one complete BTR cycle VIRTUAL BTR DONE CHECK BTR VIRTUAL BT ERROR BIT Publication 1747 6 22 7 134 RIO Block Transfer Rung 2 3 When a BTR successfully completes buffer the BTR data and unlatch the BTR enable bit Also unlatch the BTR pending bit and latch the bit that continues checking the BT status unil the SN turns off the done bit VIRTUAL BTR DONE BIT Rung 2 4 VIRTUAL BT ERROR BIT Publication 1747 6 22 BTR DATA COPY FILE Source 1 1 110 Dest 3N7 10 Length 64 4 BTR PENDING B3 VIRTUAL BTR ENABLE BIT CHECK BTR STATUS BTR PENDING B3 VIRTUAL BTR ENABLE BIT CHECK BTR STATUS RIO Block Transfer Rung 2 5 Block transfer reads will repeat as fast as possible as
222. rtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 11 when B3 7 10 has been unlatched the BSN module is ready for the next data transfer via Data Block 11 B3 6 B3 7 CU 10 10 This rung monitors the DTCW and DTSW bits for Data Block 12 When a transfer of data using Data Block 12 is not in progress copy up to 128 words to the appropriate M file location for Data Block 12 in the BSN module B3 5 B3 6 COP LE 2 Copy File 11 11 Source N18 128 Dest 0 1 4908 Length 128 B3 7 CL 11 Unlatch the virtual DTCW bit for Data Block 12 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 12 when B3 7 11 has been unlatched the BSN module is ready for the next data transfer via Data Block 12 B3 6 B3 7 4 CU 11 11 This rung monitors the DTCW and DTSW bits for Data Block 13 When a transfer of data using Data Block 13 is not in progress copy up to 128 words to the appropriate M file location for Data Block 13 in the BSN module B3 5 B3 6 COP y Copy File 12 12 Source N19 0 Dest M0 1 5036 Length 128 B3 7 cL 12 Unlate the virtual DTCW bit for Data Block 13 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 13 when B3 7 12 has been unlatched the BSN module is read
223. ry BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 12 B3 4 11 M0 1 3411 11 must be set to inform the secondary BSN that the secondary processor has received the latest Data Bloc and is now ready for the next block of data via Data Block 12 Virtual DTSW Bit for Data Block 12 B3 3 jE Copy File 11 Source M1 1 4908 Dest N17 128 Length 128 Virtual DTHW Bit for Data Block 12 B3 4 y 7 br d 11 Publication 1747 6 22 9 170 Programming Techniques This rung copies the new Data Block 13 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 13 B3 4 12 M0 1 3411 12 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 13 Virtual DTSW Bit for Data Block 13 B3 3 COP 0013 J E Copy File 12 Source M1 1 5036 Dest N18 0 Length 128 Virtual DTHW Bit for Data Block 13 B3 4 oN A 12 This rung copies the new Data Block 14 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 14 B3 4 13 M0 1 3411 13 must be set t
224. ry counter for RIO logical rack 1 group 0 1 21 not used in this example 1 22 not used in this example M1 e 23 not used in this example M1 e 24 not used in this example 1 25 communication retry counter for RIO logical rack 2 group 2 M1 e 26 not used in this example M1 e 27 not used in this example M1 e 28 communication retry counter for RIO logical rack 3 group 0 M 1 e 29 not used in this example 1 30 not used in this example 1 31 communication retry counter for RIO logical rack 3 group 6 M1 e 32 communication retry counter for RIO logical rack 8 group 0 M1 e 33 not used in this example M1 e 34 not used in this example M1 e 35 not used in this example M1 e 36 communication retry counter for RIO logical rack 9 group 0 1 37 not used in this example M1 e 38 not used in this example 1 39 not used in this example M1 e 40 communication retry counter for RIO logical rack 10 group 0 M1 e 41 not used in this example M1 e 42 not used in this example M1 e 43 not used in this example M1 e 44 communication retry counter for RIO logical rack 11 group 0 M1 e 45 communication retry counter for RIO logical rack 11 group 2 M1 e 46 not used in this example 1 47 not used in this example Publication 1747 6 22 5 86 Scanner Configuration and Programming 2 Slot Addressing Remote Chassis 1 Slot Addressing Remote Chassis 1 2 S
225. s corresponding bit in the Data Transfer Handshake Word DTHW must be set to advise the 1747 BSN that the data block was already received This bit must be held set until the corresponding bit in DTSW is cleared by the 1747 BSN module The bit must then be cleared Backup System Theory of Operation A redundant system using the 1747 BSN can be initially defined as an Asynchronized Data Transfer system While the Input Image Table is automatically acquired from the RIO link by the secondary system the Data Table is transferred by an application program written by the user It is recommended that you minimize the amount of data to be transferred from the primary to the secondary processor because the program logic generates the same outputs based on the same inputs All timer and counter values must be transferred at least once because the primary and backup processors may have started at different times and are not synchronized Therefore timer and counter data may be different in the two processors For example after a faulted processor is repaired and reinstalled as a backup the timer and counter accumulated values as well as the control words in the two processors are different The number of data table words to be transferred from a primary to a secondary processor is dependent on the user program and or user architecture Power up Sequencing Processor Mode Change Sequencing Operating Your SLC 500 Backup System 4 57
226. s over the HSSL you may encounter problems For example if you are shifting four bits of BCD data through several words bit by bit the data table contains invalid data until each shift is complete Should the 1747 BSN module transfer one or more of these values to the backup system and the primary system fails the data table of the backup system contains intermediate values for an indefinite amount of time The result is illegal BCD values Block Transfer Instructions It is impossible to guarantee that both processors are executing a given BTW or BTR at the same time This is because the remote I O scans are not synchronized and the block transfer data is not transferred instantaneously by both SLC 500 processors The BTR files in the secondary processor always reflect information contained in the primary processor except with a time delay To avoid the possibility of block transfer data changing during the scan of the program you can buffer data at the beginning of the ladder program to ensure continuity Another potential problem with block transfer instructions is that during switchover the secondary scanner may skip one or more remote adapters This may happen because the new primary scanner previously the secondary was in a different place in its remote I O chassis scan Message Instructions In your backup system the secondary processor is disconnected from the Data Highway Plus link Therefore it cannot execute mess
227. s the block to the 1 area to be read by the secondary SLC 5 0x The secondary 1747 BSN also sets its corresponding bit in DTSW to advise that this new block is ready to read After reading the block the SLC 5 0x must set the corresponding handshake bit in DTHW Then the 1747 BSN module clears the bit in DTSW 15 14 13 12 1 109 8 7 6 5 M0 34110 0 10 0 0 0 0 0 0 0 0 w ole ol 0 0 1 1 1 2 Block 3 Block 4 Block 5 gt Block 6 B Block 4 7 p gt Block 8 Block 9 pe Block 10 p gt Block 11 pw Block 12 Bw Block 13 p gt Block 14 pw Block 15 p gt Block 16 DTHW Word Program File 2 Module Control and Status Word 6 97 The following ladder program example shows how to monitor the status bits in the System Status Word SSW and in the Module Status Word MSW that indicate which processor is in the primary mode and which is in the secondary mode This information is needed in order to determine whether the local processor needs to execute the primary system or the secondary system HSSL data transfer ladder logic File 2 monitors the appropriate SSW and MSW bits and executes subroutine 4 if the local system is in primary mode Note It is recommended that the M1 and MO file lengths for the BSN be set to the maximum 5548 There is no memor
228. sed for transferring the data blocks This programming scheme results in a lower overall data transfer throughput and has a minimal impact in the program scan time The second programming alternative transfers each data block at its maximum possible throughput This method is shown in the ladder program example earlier in this chapter With this method the application program tries to make all the possible data transfers in each program scan according to the DTSW bits Data Transfer Method 1 With this alternative the primary SLC 5 0x uses a counter to select the 1747 BSN module to which the data block is sent The primary SLC 5 0x also uses a second counter to select which block is sent to the BSN module If the system has only one 1747 BSN only one counter is used The following procedure is used in the primary SLC 5 0x for sending the data blocks 1 Read all the DTSWs from the respective 1747 BSN modules 2 Clear all DTCW bits corresponding to the data blocks that are marked as already transferred to secondary system in the DTSWs Send the data blocks to their respective 1747 BSN modules 3 Look at the counters and DTSWSs to check whether the next data block that is sent is able to receive new data from the SLC 5 0x If the next data block is not able to receive new data increment the data block counter and check whether it is time to select the next 1747 BSN module If the next data block is able to receive new data inc
229. ss To specify an address place a 1 at the bit corresponding to the starting logical address of each logical device Word 4 Complementary Device Logical Image Size specifies the logical image size amount of scanner I O image of the complementary devices set in word 3 As with word 3 these bits correspond to RIO logical rack and logical group numbers To specify image size place a 1 at each group a device occupies Important Setting device addresses in word 3 of the G file configures the system to operate in the complementary I O mode Not setting device addresses in word 3 causes the system to operate only in the primary normal mode If you wish to operate in the complementary mode and you only have primary devices configured word 3 of the G file must be set to a decimal 1 and word 4 of the file must be equal to zero Publication 1747 6 22 5 62 Scanner Configuration and Programming 10 9 8 7 Bit Number 6 5 4 3 2 1 0 Contains scanner information for the SLC a Your programming device 0 0 1 0 0 0 0 0 0 Mix Word 0 0 1 0 0 0 0 0 automatically sets the scanner Information RIO Logical Rack StartingRIO Logical Rack 2 RIO Logical Rack 1 Starting RIO Logical Rack 1 Starting Lo
230. tary device to use more I O image space than an associated primary device then block transfers can only be performed to locations in the complementary device that have associated I O image space in the primary device For example if a primary device is 1 2 logical rack and a complementary device is a full logical rack block transfers can be performed only in the first 1 2 logical rack of the complementary device Attempting block transfers in the last half of the complementary device results in a BT error error 11 device not configured Complementary I O Image Bit Number Octal 17 107 0 Bit Number Decimal 15 87 0 1 2 logical rack Word 0 1 2 logical rack configured configured and usable eee and usable Rack 8 Word 4 1 2 logical rack not configured Word 6 1 2 logical rack configured but Word 7 not usable for BT since Words 4 7 are not configured for the primary device Publication 1747 6 22 7 122 RIO Block Transfer Setting Up Block Follow the steps below to set up your scanner and SLC control Transfer program for either BTWs or BTRs 1 Touse the BT functionality you must increase the size of the MO and M1 files The size depends on the number of BT buffers your applications requires Note that setting the buffers to maximum size 3300 will not affect system performance However addressing M files in your SLC control program
231. tects the DN flag processes the BT data and clears the enable EN flag The scanner detects that the SLC control program has completed processing because the EN flag is clear and clears the EW ST and DN flags At this point the SLC control program could initiate another BT operation in the same MO BT buffer by setting the EN flag RIO Block Transfer 7 117 Block Transfer Failure at Startup Control Information 1 Status Information Status Flag EW ST l DN Block Transfer Failure at Startup In the above example the scanner found invalid control information e g an improper logical address in the MO block transfer control buffer 1 The SLC control program fills in the MO BT buffer and sets the EN flag 2 The scanner detects that the EN flag is set determines that there is some invalid information in the MO control buffer fills in the M1 BT buffer status error code field and sets the ER flag 3 The SLC control program detects the ER flag examines the M1 BT status buffer error code and clears the EN flag after processing the error 4 The scanner detects that the SLC control program has processed the error and clears the ER flag Note that in this example the EW and ST flags never set Also the SLC control program must clear the EN flag in order to start a new BT after the error has been corrected Publication 1747 6 22 7 118 RIO Block Transfer Block Transfer
232. tes Cancelling a BT causes an error ER bit to set and an error code to display in the M1 BT buffer Note that the Timeout TO flag must be cleared before initiating a new BT You can initiate a new BT by clearing the EN flag waiting for the ER flag to clear and then setting the EN bit The RIO scanner ignores a BT request if both TO and EN flags are set at the same time 3 You set bit 15 1 to Enable EN a BT operation You set this bit after you have entered all other control information i e bits 7 and 8 in the MO BT buffer You clear this bit after either the Done DN or Error ER bits are set in the M1 Status file See the M1 file BT Buffer Layout section for more details on the DN and ER bits M1 File Block Transfer Input Status Buffers There are 32 BT status buffers allocated in the M1 file These buffers indicate the status for all BTR and BTW operations and also contain BTR input data Below is the layout of BT buffer 1 Important The layout below is the same for all 32 MI file BT buffers M1 e 100 Status flags that describe the status of the BTR and BTW operations Status flags are described in detail on the following page 1 101 Status of actual number of BTW words sent or the number of BTR words received Publication 1747 6 22 7 112 RIO Block Transfer M1 e 102 Contains the logical address you have selected in the 102 file in rack group and slot number format The logical rack
233. tes when 1 indicates System is in the the Local System is the Remote System is Primary Mode in the Primary Mode in the Primary Mode B3 1 B3 2 B3 2 JSR 0002 J 4 Mt Jump To Subroutine 6 6 14 SBR File Number U 4 0003 C END gt Publication 1747 6 22 Programming Techniques Program File 3 0000 0001 0002 0003 0004 The following rungs are meant to be executed only when this processor BSN is in the Backup Mode When it is acting as the Processor this rung copies the DTSW Data Table Status Word to an internal storage word within the SLC processor B3 3 in this example Virtual amp Actual DTSW Words MOV 9 167 Move Source MI 1 3410 lt Dest B3 3 0000000000000000 This rung copies the new Data Block 1 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW Data Table handshake Word bit for Data Block 1 B3 4 0 MO0 1 3411 0 must be set to inform the secondary BSN that the secondary processor has received the latest Data Block and is now ready for the next block of data via Data Block 1 Virtual DTSW Bit for Data Block 1 B3 3 COP 4 Copy File 0 Source M1 1 3500 Dest N12 0 Length 128 Virtual DTHW Bit for Data Block 1 B3 4 0 This rung copies the new Data Block 2 data from the secondary BSN to a file within the secondary processor When the COPy is complete the DTHW D
234. the SLC rack containing the scanner X bit not used defined Publication 1747 6 22 5 74 Scanner Configuration and Programming MO File Remote Output Reset Control Bit Number decimal Logical Rack 0 Device Inhibit Word 24 Logical Rack 1Device Inhibit Word 25 Logical Rack 2 Device Inhibit Word 26 Logical Rack 3 Device Inhibit Word 27 GFile Device Address Word 1 MO Control File Bit Number decimal Logical Rack 0 Device Inhibit Word 24 Logical Rack 1 Device Inhibit Word 25 Logical Rack 2 Device Inhibit Word 26 Logical Rack 3 Device Inhibit Word 27 Publication 1747 6 22 MO Control File Words 24 through 27 Words 24 through 27 use these words to command a logical device to reset all of its outputs when the SLC processor leaves the Run mode and enters the Test Program or Fault mode regardless of the device s Hold Last State setting Resetting the bit corresponding to the starting address of a device to 0 allows the Hold Last State switch on the logical device to determine output operation when the SLC processor leaves the Run mode Setting the bit to 1 commands all outputs off regardless of the device s Hold Last State setting Only the device s logical starting address bit matters Setting other bits has no effect Bits 0 3 correspond to I O group locations within logical racks 0 1 2 and 3 Default When the processor enters Run or Test mode the scanner sets the starting address bit of each de
235. these status flags If the BT completes successfully the scanner fills in the MI BT length status field If it was a BTW operation the BTR data area of the M1 BT buffer is not updated If it was a BTR operation the new BTR input data based on length is placed in the BTR data area of the M1 BT buffer and the unused buffer area clears The DN status flag then sets to indicate to the SLC control program that the BT operation completed successfully and that the 1 input status buffer has been completely updated If the BT fails the length field and BTR data area are not updated length remains cleared The error code field indicates the problem type The ER flag sets to indicate to the SLC control program that the BT operation was unsuccessful The SLC control program must indicate to the scanner when it is done processing the M1 input status buffer because DN or ER was set so the corresponding MO output control buffer can be re used for another BT operation The SLC control program indicates that it is through processing when it clears the EN flag When the RIO scanner detects that the EN flag has been cleared by the SLC control program it then clears the EW ST and DN or ER flags This ensures that the status flags in the 1 input status buffer are not reflecting the results of the previous BT operation Note that the other M1 BT Status buffer fields such as length error code and BTR data are not cleared when the scanner c
236. tion 1747 6 22 4 54 Operating Your SLC 500 Backup System Publication 1747 6 22 Secondary Processor Remote Programming Important The programming device must be connected through the network and must not bypass the relay in the 1747 BSN module if the programs in both processor are identical e g if both DH mode addresses are the same If you were to connect the device directly to a processor it must be connected to the primary processor Therefore if your system were to switch to the secondary system you must then move your device to your new primary processor In the 1747 backup system only the primary processor is connected to the link The secondary processor is not physically connected but it communicates with the secondary 1747 BSN module making this processor think that it is on the DH network This separate link prevents Data Highway faults in the secondary processor The 1747 BSN backup module provides remote programming capability for your secondary processor This means that even with the programming device directly connected to the primary processor the secondary SLC 500 processor memory can be programmed and or monitored The primary 1747 BSN module provides an access point for a programming device to access the secondary processor Using the 1747 BSN module you can communicate from a programming device across the backup modules to the secondary processor You must assign both the primary and the secondary
237. to 2K total per BSN module RS 232 485 Communication Channel The RS 232 485 channel is a dumb communication channel which is used to switch the connection to one operator interface or other DF1 device through RS 232 485 The communication channel relays are closed when the module is primary otherwise the relays are open as shown in the figure below Primary Secondary eC e SLC 5 04 1747 BSN 1747 BSN SLC 5 04 To Operator Interface RIO DH Communication Channel The RIO DH communication channel has a relay that is closed when the 1747 BSN module is in the primary mode otherwise the relay is open The communication channel supports the following configurations The illustration on the next page shows the channel block diagram 1 RIO Supports the 57 6 115 2 and 230 4 KBaud configurations When the module is in primary mode it emulates all the 1747 SN Series B functionality When the module is in secondary mode the channel receives the input data from the primary 1747 BSN module and sends it to the SLC 5 0x emulating the 1747 SN Series B backplane communication As a result the secondary SLC 5 0x thinks that it is really connected to the remote racks 1 Operating Your SLC 500 Backup System 4 53 2 DH Works under 57 6 115 2 and 230 4 KBaud configurations The primary 1747 BSN enters into the DH network using
238. to a Publication 1747 6 22 RIO Block Transfer 7 151 Rung 2 2 Unlatch the bit that continues to check the BTR status When a BTR is complete the done or error bit is set Tr ladder program must then unlatch the enable bit then wait for the BSN module to turn off the done error bit befor another BTR to the same M file location can be initiated This is one complete BTR cycle VIRTUAL BTR DONE CHECK BTR BIT STATUS N7 60 B3 U 13 2 BTR ERROR BIT N7 60 12 Rung 2 3 Copy the BTW status area to an integer file only when a BTW is in progress This status data will then be used throughout the program and will limit the number of M file accesses BIW BTW PENDING STATUS B3 TXCOP spesse oS ee ee eee SS ee ee COPY FILE 1 Source 1 1 200 Dest N7 64 Length 4 miel CHECK BTW STATUS B3 vm 3 Rung 2 4 Unlatch the bit that continues to check the BTW status When a BTW is complete the done or error bit is set 1 ladder program must then unlatch the enable bit then wait for the BSN module to turn off the done error bit befc another BTW to the same M file location can be initiated This completes the hand shake process VIRTUAL BTW DONE CHECK BTW BIT STATUS N7 64 B3 pesce pee eee aes ae SSS a a
239. to perform MO file write to enable BT appendix B Backup Scanner Output Delay time with BTs present There must be an output delay time added for each BT buffer that is being used see the section TeNo bt since the backup scanner processes only Determining TsNo bt on one BT enable or disable every to page B 7 minimize the impact on discrete throughput Equals the sum of the throughput times for all BTs scheduled to the same logical rack time waiting is queue Tswo p time to Totwait schedule pending BT If Calculated not being performed to the same logical rack this value equals zero see the section RIO Scan Tnio RIO scan time without BTs Time Calculation on page B 4 Amount that the RIO scan time can be T increased due to BTs This includes the ee on dade bix time for the backup scanner to initiate the B 7 9 py 0N pag BT and transfer the data Time for the adapter to acknowledge the BT request For the 1747 ASB the manual defines this as no more than one ASB Tadp bt backplane scan time and two RIO scans adapter user manual However the two RIO scans are already included in the above equation so only the ASB scan time needs to be added One processor scan time may occur before Tps the SLC control program detects thatthe DN APS reference manual flag has been set or cleared 1 When calculating BT throughput one Tsyo pt is also required to handle the BT response 1
240. ty considerations ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attention statements help you to identify a hazard avoid a hazard recognize the consequences Important Identifies information that is critical for successful application and understanding of the product Publication 1747 6 22 Overview Table of Contents Preface Who Should Use This Manual P 1 How to Use This Manual P 1 Manual Contents 1 Related Documentation 2 Conventions Used This Manual P 3 Allen Bradley Support P 3 Local Product 5 P 3 Technical Product Assistance P 3 Your Questions or Comments on the Manual P 3 Chapter 1 System Overview 1 1 Scanner I O Image 1 3 How the Scanner Scans Remote I O 1 4 SLC and Scanner Asynchronous Operation 1 5 How the Scanner Interacts with Adapters 1 6 Scanner I O Image Concepts 1 6 Example Scanner I O 1 7 Transferring Data with RIO Discrete and Block Transfers 1 8 Physical and Logical RI
241. umber of 1747 BSN Modules This bit indicates the number of 1747 BSN modules in the system Switchover Diagnostic This bit is set when a 1747 BSN module tests the functionality of the Remote I O detector circuit when the processor changes form Run to Program mode If the test fails this bit is set until the next power down In this case the module must be replaced System Status Word Bits Number of 1747 BSN s 11 10 9 8 0 0 0 0 1 0 0 0 2 0 0 1 0 3 0 0 1 4 0 1 0 0 5 0 1 0 6 0 1 1 0 7 0 1 1 8 Publication 1747 6 22 6 92 Module Status Word Module Control and Status Word The Module Status Word MSW shows the status of the 1747 BSN module itself and its counterpart in the remote system Bits 0 through 7 show the local status while bits 8 through 15 show the remote status The module status bits have the following meaning 5 14 13 12 11 10 9 8 7 5 4 1 M1 s 3401 0 0 0 0 0 ev or 0 em 6 0001000 LOCAL MODULE BITS HSSL LSL Buffer Full DH Communication RIO Communication Processor Fault Primary Secondary System Reserved REMOTE MODULE BITS HSSL LSL Buffer Full DH Communication RIO Communication Processor Fault Primary Secondary System Reserved Publication 1747 6 22 YYYYYYYY i HSSL High Speed
242. urce M1 1 3410 lt Dest B3 6 0000000000000000 This rung monitors the DTCW and DTSW bits for Data Block 1 When a transfer of data using Data Block 1 is not in progress copy up to 128 words to the appropriate M file location for Data Block 1 in the BSN module Virtual DTCW Bit for Virtual DTSW Bit for Data Block 1 Data Block 1 B3 5 B3 6 COP 0001 44 jt Copy File 0 0 Source 3N13 0 Dest 0 1 3500 Length 128 Virtual DTCW Bit for Data Block 1 B3 7 CLI 0 Unlatch the virtual DTCW bit for Data Block 1 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 1 when B3 7 0 has been unlatched the BSN module is ready for the next data transfer via Data Block 1 Virtual DTSW Bit for Virtual DTCW Bit for Data Block 1 Data Block 1 B3 6 B3 7 0002 4h CUD 0 0 This rung monitors the DTCW and DTSW bits for Data Block 2 When a transfer of data using Data Block 2 is not in progress copy up to 128 words to the appropriate M file location for Data Block 2 in the BSN module Virtual DTCW Bit for Virtual DTSW Bit for Data Block 2 Data Block 2 B3 5 B3 6 COP 0003 44 Jt Copy File 1 1 N13 128 Dest 0 1 3628 Length 128 Virtual DTCW Bit for Data Block 2 B3 7 1 Unlatch the virtual DTCW bit for Data Block 2 when the comparable virtual DTSW bit is set by the BSN module to i
243. us LEDs The table below describes the six LEDs located on the module s front panel To ensure that they are operating correctly all LEDs are illuminated during power up LED Definition Status amp Color Indication The module is in the primary PRI Primary Steady Green inne The module is in the SEC Secondary Steady Amber secondary mode RIO RIO Communication Steady Green The RIO link is working properly Flashing Green A remote device is not configured or connected correctly or is faulted The RIO link has a fault The scanner is connected Flashing Red incorrectly or all devices are configured improperly have no power or are faulted Steady Red There is a configuration error Off The communication channel is not configured as RIO The module is not ready for ERR Backup Module Error Flashing Red swilchover Off The module is ready for switchover High Speed Serial HSSL Link Communication Flashing Green The link is operating with no errors A communications error has ofi been detected on the HSSL FLT Fault Steady Red A hardware fault has occurred Flashing Red The module is not configured properly Publication 1747 6 22 1 34 Overview Publication 1747 6 22 Configuration Switch Module Address Switch ZO REL ND L AL NC BL 20 b nm 12
244. ver occurs Time out on Remote I O Link The remote I O chassis are updated one at a time The total remote I O update is 10 ms per chassis typical at 57 6K baud To keep the I O chassis from faulting and losing control of the I O the switchover in the remote I O link is accomplished in less than 50 ms The remote I O link switchover starts when the remote I O relays in the primary 1747 BSN module open and ends when the remote I O relays in the secondary 1747 BSN module close This switchover time is less than the 100 ms for the remote I O adapter watchdog timeout This permits continuous control of the I O from the backup system processors Data Table Transfer Time on HSSL Data table transfer time refers to the amount of time it takes to transfer critical data from the primary system to the secondary system This time is dependent on the amount of data to be sent between the two systems the number of remote I O chassis and the number of remote I O block transfers that are being executed The 1747 BSN module is capable of transferring up to 100K Word per second 10 msec per K Word This data rate is 2M bits second Switchover Considerations 8 159 Divergence Forcing I O The synchronization of program execution in both processors limits divergence between the two systems by ensuring that the resulting output data in both processors is always identical Because the program scans of the processors are not synchronized it
245. verview 1 29 Complementary 1 0 Placing Modules with 1 2 Slot Addressing The figure below illustrates a possible module placement to configure complementary I O using 1 2 slot addressing 01 23 45 67 01 23 45 67 01 29 vuzm 0t 23 45 87 5 01 98 5 48 BL 01 23 I Input Module 8 16 or 32 point O Output Module 8 16 or 32 point BT Block Transfer Module z Output modules use the same output image table bits This is not recommended 2 Must be empty if corresponding primary slot is block transfer Summary for Placing Modules Used In Complementary I O Discrete Modules Addressing Method Types of Modules used Placement Install input modules opposite output modules 2 slot 8 point and output modules opposite input modules 1 slot 8 point 16 point 1 2 slot 8 point 16 point 32 point 1 If an input module resides in either slot associated with a logical group of the primary chassis an input module cannot reside in that logical group s complimentary chassis Publication 1747 6 22 1 30 Overview Block Transfer Modules Addressing Method 2 slot Placement The right slot of the primary I O group can be another block transfer module or an 8 point input or output module The left slot of the complementary I O group
246. vice configured in the G file to 1 ATTENTION The use of the device s Hold Last State switch can result in its outputs remaining energized when not under control of the SLC processor Only experienced SLC programmers should use this function Starting Group Not Defined 6 4 2 0 15 14 13 12 11 10 9 8 7 6 5 4 3 a 1 MO File x x x x x x x x x x x x 1 0 0 1 M0 e 24 x x x x x x x x x x x x 0 0 0 1 M0 e 25 x x x x x x x x x x x x 0 0 1 0 0 26 0 0 1 M0 e 27 e slot number of the SLC rack containing the scanner X not used defined Example of Remote Output Reset Control By default the scanner sets the bits in M0 e 24 through 0 27 to 1 wherever there are configured devices present This commands all devices outputs to reset regardless of their Hold Last State switch The application program can remove commanded reset of devices by resetting bits to 0 RIO Logical Rack 3 RIO Logical Rack 2 RIO Logical Rack 1 RIO Logical Rack 0 Starting Group Starting Group Starting Group Starting Group 6 4 2 0 6 4 2 0 6 4 2 o 6 4 2 0 0 1 0 0 0 1 0 0 0 0 1 1 0 0 1 A 15 14 12 n 9 8 7 6 5 4 3 2 1 File X 1 1 M0 e 24 x x x x x x x x x Poo 0 0 0 1 M0 e 25 x x x x x x x x 0 1 0 26
247. y for the next data transfer via Data Block 13 B3 6 B3 7 J E CU 12 12 This rung monitors the DTCW and DTSW bits for Data Block 14 When a transfer of data using Data Block 14 is not in progress copy up to 128 words to the appropriate M file location for Data Block 14 in the BSN module B3 5 B3 6 COP E Copy File 13 13 Source N19 128 Dest 0 1 5164 Length 128 B3 7 13 Unlatch the virtual DTCW bit for Data Block 14 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 14 when B3 7 13 has been unlatched the BSN module is ready for the next data transfer via Data Block 14 B3 6 B3 7 E CU 13 13 Publication 1747 6 22 9 176 Programming Techniques 0029 0030 0031 0032 0033 0034 This rung monitors the DTCW and DTSW bits for Data Block 15 When a transfer of data using Data Block 15 is not in progress copy up to 128 words to the appropriate M file location for Data Block 15 in the BSN module B3 5 B3 6 COP FE pus Copy File 14 14 Source N20 0 Dest 0 1 5292 Length 128 B3 7 CTS 14 Unlatch the virtual DTCW bit for Data Block 15 when the comparable virtual DTSW bit is set by the BSN module to indicate that it has received the last data via data Block 3115 when B3 714 has been unlatched the BSN module is ready for the next data transfer via Data Block 15
248. y or speed penalty for creating the maximum buffer size for these files in the BSN modules Copy the System Status Word SSW and the Module Status Word MSW from the BSN module to internal storage words in the SLC processor every program scan Bits 6 and 7 of the SSW word indicate whether this processor is Primary or Secondary at any given time Bits 6 and 14 of the MSW word indicate whether the local or remote system is in the Primary or Secondary mode respectively Virtual SSW and MSW words bits are used to minimize M file transfers thereby minimizing their effects on the program scan time COP 0000 Copy File Source M1 1 3400 Dest 3 1 Length 2 This rung executes subroutine number 3 when the Local System is in the Secondary Mode Subroutine 3 contains the logic which must be executed to properly transfer HSSL data from the Secondary BSN Module to the Secondary SLC Processor Virtual SSW Bit when 1 indicates Virtual MSW Bit Virtual MSW Bit the local system is when 1 indicates when 1 indicates in the Secondary the Local System is the Remote System is Mode in the Primary Mode in the Primary Mode 3 1 3 2 B32 JSR 0001 J E Yt ir Jump To Subroutine 7 6 14 SBR File Number U3 This rung executes subroutine number 4 when the Local System is in the Primary Mode Subroutine 4 contains the logic which must be executed to properly transfer HSSL data from the Primary SLC Processor to the Primary BSN Module Virtual S
249. ype of rack that you have Add those numbers together T adapter 2 Tadapter 1 Tadapter 3 1 4 0 ms 2 5 5 ms 3 3 5 ms TRIO 25 5 ms 3 Find Ton on page B 13 in the table Tex without MO File Writes Normal Mode For this example Tupa gt Thoig and there are 4 logical racks configured Therefore Tswo 7 0 ms 4 Substitute all the values for variables in the throughput formula and solve for throughput Tam nbt 27 2 2T bp TsNo Tsvi Tia Tam nbt 2 25 0 2 25 5 8 0 7 0 5 0 10 0 1 0 Tam nbt 132 0 ms maximum throughpu Publication 1747 6 22 190 Specifications Publication 1747 6 22 Discrete I O Throughput with Block Transfers Present The information in this section is used to calculate the discrete throughput of the 1747 BSN Backup Scanner if there are BTs occurring on the RIO link to chassis If BTs are not present on the RIO link you must use the Discrete I O Throughput without Block Transfers Tdm nbt Present section to determine your throughput See page B 3 The formula to calculate discrete I O throughput with BTs present is 2T ps 2TRI0 2 TsNo bt Tsni Tia Tam bt The maximum discrete throughput with BTs in milliseconds ms To calculate 5 throughput substitute values for the variables in the formula above Locate these values in the following docum
250. yte 9 17 Timer instructions 9 16 Timing diagrams 7 14 Total switchover time 8 1 Transmitter program 4 5 Index Publication 1747 6 22 Publication 1747 6 22 Reach us now at www rockwellautomation com Wherever you need us Rockwell Automation brings together leading brands in industrial automation including Allen Bradley controls Reliance Electric power transmission products Dodge mechanical power transmission components and Rockwell Software Rockwell Automation s unique flexible approach to helping customers achieve a competitive advantage is supported by thousands of authorized partners distributors and system integrators around the world e Allen Bradley DOGE Americas Headquarters 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 ROCKWELL Rockwell European Headquarters SA NV avenue Herrmann Debroux 46 1160 Brussels Belgium Tel 32 2 663 06 00 Fax 32 2 663 06 40 Asia Pacific Headquarters 27 F Citicorp Centre 18 Whitfield Road Causeway Bay Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Automation Publication 1747 6 22 October 1999 1999 Rockwell International Corporation All Rights Reserved Printed in USA

1747-6.22, Backup Scanner User Manual

Contents

Download Pdf Manuals

Related Search

Related Contents