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1775-6.5.5, PLC-3 Family I/O Scanner Comunication

1. Figure 4 1 Example DH and DH Configurations Data Highway DH Link PLC 5 Family Controller a zn 9 6 Computer 1775 85 V 1785 KA Scanner Module p Seo TTT T r5 PCS ula Controller 5 1770 KF2 m d Lil 5 Module s eee DH Link 1770 KF2 aay a Module i i i i i L i PLC 30r i i PLC 3 10 Advisor 24 Art alil i Controller 2 ig Color uis EH MN 1 d Aie Graphic LEM System i 1775 KA 1775 SR5 Module Scanner Data Highway Plus
2. External Device PLC 3 External Device PLC 3 External Device PLC 3 External Device CCR or ACK Command Block Break Terminate Communication To Sheet 2 Character Timeout Invalid Response NAK Channel Terminate Timeout Communication Break Terminate Fault Code Communication oH Response ex No in Timeout CCR CCR y Response 05 Hex Other Yes Character Timeout Break Terminate Communication From Sheet 2 From Sheet 1 PLC 3 External Device PLC 3 External Device PLC 3 External Device PLC 3 External Device gt Response Block ACK or COR Response Break Terminate Communication Shift Shift Shift Out In In Character Timeout Break Terminate _ Communication Invalid Response Character Yes Timeout NAK i Terminate _ Fault Code Communication d Yes 00 Hex Other Ty CCR CCR No Response 05 Hex Break Terminate Communication No Other L Channel Terminate Character Timeout Communication Timeout Break Terminate Are Communication Yes There More Blocks inthe Response d Will Not Occur During To Sheet 1 Multiple Block Responses No G A 13 Appendix A Binary Command Language Extended Addressing A 14 Most BCL commands and responses that require an address as one of the parameters use the extended
3. Figure 1 2 Indicator Locations for 1775 85 and 1775 SR5 Scanner Modules 1775 SR5 nner 1775 85 Scanne Scanner Oo SR 5 PASS 1 E Q FAIL 6 s5 r Thumbwheel switch FORCE FORCE cm g CH1 ei CUP a CH3 Miri EM RCVG XMTG RDY RCVG ERR RDY DIS ERR DIS Chapter 1 Scanner Hardware and Installation Configuring the Scanner Hardware Before you install the scanner you need to configure the module You use the connectors terminal arm and switches when setting the thumbwheel and switches installing the scanner We describe these connections and configurations in the following sections Setting the Thumbwheel and Switches Before inserting the scanner into a chassis 1 Set the thumbwheel switch to a unique number 1 to 15 to enable the processor to distinguish one scanner from another You must have a scanner with the thumbwheel set for 1 2 Make the necessary switch settings Figure 1 3 shows the location of the backup switches for the 1775 S5 and 1775 SR5 scanner moduels Figure 1 3 Location of Backup Switches for 1775 S5 and SR5 Scanner Modules Backup switch at bottom edge of module gt F unn m 1234 co h Ah A Eh An h m A Cg QA Cun Cur Cur i oH C
4. 15415 Access Privileges Not every station can read or write to every other station In general read and write access privileges depend on two factors type of processor at the transmitting and receiving stations protections set at the receiving station The rest of this section explains how these access privileges vary according to the above factors PLC 3 Stations PLC 3 stations can read and write to other PLC 3 station data tables A local PLC 3 station can prevent remote PLC 3 stations from writing to the local station s data table by setting the memory protect keyswitch To allow writes to local memory depending on the memory protect keyswitch setting select Accept Writes in the DH DH options menu in LIST at the local station 4 9 Chapter 4 DH and DH Communication 4 10 PLC 2 Stations For communication with a PLC 2 station write access privilege depends on switch settings at that remote station For an explanation on how to set the switches for write access refer to the Communication Adapter Module User s Manual publication 1771 6 5 1 Accessing a PLC 2 Station Access to a PLC 2 station also depends on the type of command transmitted to that station There are two types of commands protected write commands can only write to specified sections of the data table in a PLC 2 processor Memory access rungs in the PLC 2 ladder program specify where in the data table the PLC 3 can wr
5. Unused Must 0 Mode Select 00 Program Load 01 Test Remote 10 Run Lock 11 No Change 0 Remote Access Allowed 1 Remote Access Not Allowed 12137 The following example command block resets the remote lock bit allowing remote access to other devices and selects run mode The data byte stores the flag byte 02 hex The processor responds to a set CPU mode command with one of the following response codes STX ISC SIZ CMD DAT ETX CHK 02 03 02 2A 02 03 36 Response Codes Hex Description 00 Success 06 Access not allowed OF No privilege The following example response block shows a successful set CPU mode command STX OSC SIZ RSP ETX CHK 02 11 01 00 03 17 Appendix A Binary Command Language Set Operating Context Command Hex 2B Parameters New default context any context between 1 and 15 Description You can change the default communication context by using the set operating context command If you send a value greater than 15 the processor uses the lower 4 bits only The processor does not accept a default context of 0 The following example command block changes the default context values to 2 STX ISC SIZ CMD DAT ETX CHK 02 03 02 2B 02 03 37 The data byte stores the new default context The processor responds to a set operating context command with one of the
6. If you set the protocol switches for DH or DH communication you must set the station number Figure 1 6 Valid station numbers range from 000 to 376 octal for DH and 00 to 77 octal for DH Switch numbers correspond to the 4 5 and 6 second digit 1 2 and3 third digit LSD 2 1 MSD Most Significant Digit 2 LSD Least Significant Digit Chapter 1 Scanner Hardware and Installation Figure 1 6 Setting the Station Number for the DH or DH Channel If you are using channel 4 for DH or DH communication then set the station number with these switches 12 3 4 5 6 7 8 4 Down toward board t Up away from board Most Significant Least Significant Example The switch settings for station number 037 are Station number 937 Chapter 1 Scanner Hardware and Installation 1 10 Setting Backup System Functions On the bottom edge Figure 1 7 near the rear of the scanner is a set of 4 switches If you are using a backup configuration then you can set switches 2 and 3 to define the switchover type For detailed information on backup refer to the PLC 3 Backup Concepts Manual publication 1775 6 3 1 Figure 1 7 Setting Backup System Functions Always Up t Up away from board g Down toward board LI If you are operating a backup system then set these switches to set up the type of switchover Switch System Switchover Type primary 2 3 or backup A
7. To find the word that stores the retry count for an I O adapter Adapter in decimal x 4 the first of the words that stores the retry counts for the adapter The particular word depends on the starting I O group For example the retry counts for adapter 10 are in words 40 to 43 S3 40 to S3 43 15181 Important The processor does not create status file 3 at power up You must create it in memory by using the create command If the retry count is high for an I O channel check to see if it is caused by one of the following loose connection with the twinaxial cable cat no 1770 CD that connects from the scanner s terminal arm to the I O adapter noise problem with the twinaxial cable cat no 1770 CD that connects from the scanner s terminal arm to the I O adapter improper installation of I O terminator resistors along the I O channel Refer to the PLC 3 Family Controller Installation and Operation Manual publication 1775 6 7 1 for detailed information Retries for a Peer to Peer or Backup Communication Channel Chapter 7 Diagnostics Methods Upon executing a retry if the I O adapter responds properly normal operation continues If the I O adapter does not respond properly the scanner continues to execute retries until the I O adapter returns a valid response or the processor declares a major or minor I O fault based on how you configure the rack list in LIST Adapters on channel Num
8. Appendix A Binary Command Language If the success response code returns the next byte contains the number of words in the reference block which do not match the block in memory The following response block shows a successful verify block command STX OSC SIZ RSP DAT ETX CHK 02 01 01 00 00 03 07 The data byte stores the miscomparison count If any other response code returns no data follows Uploading Downloading You can read from and write to physical locations in processor memory using the read block physical and write block physical commands These commands are executed faster than read block and write block commands However physical addresses change when you edit the program which makes it difficult to keep track of where a given word or block of data is stored Therefore use the read block physical and write block physical commands only for uploading and downloading the entire memory contents to from a computer The read block physical and write block physical commands use physical addresses which are different than the addressing used for other BCL commands The address requires two words four bytes with the least significant byte sent first The most significant byte must contain the value 01 hex The value contained in the other bytes ranges from 0 to the highest address in the processor programmable processor depending on the amount of memory in the system We explai
9. Count the number of entries in the I O chassis scanning sequence list for the channel 6 Calculate the time between block transfers as follows T NBT x NM ms NE 1 x 7ms Where Is the T time between block transfers NBT nominal block transfer time Table 3 B NM number of block transfer modules step 4 NE number of entries in the I O scan list PLC 3 family controllers can communicate with other PLC 3 family controllers using peer to peer or backup communication channels Peer to Peer Communication A peer to peer communication channel includes one PLC 3 or PLC 3 10 controller configured as the master and up to six PLC 3 or PLC 3 10 controllers configured as slaves The master communicates with all slaves on the channel while each slave communicates only with the master Figure 3 1 Also when configured in a backup system the backup slave receives all input data that are sent to the primary slave if the slave numbers are the same 3 3 Chapter 3 I O ommunication Figure 3 1 Using a Peer to Peer Communication Channel Slave A Master Slave B Oo o O egg zn E83 Fez BBa cmm Twinaxial cable for setting up peer to peer communication channel 15410 You configure the master and slave controllers for the peer to peer channel through LIST Communication occurs via files that you specify in LIST
10. 7 5 Chapter 7 Diagnostics Methods Diagnosing Faults with Module Status Indicators All PLC 3 modules have two self test indicators Table 7 A describes how to interpret these indicators Table 7 A Module Self test Indicators Indicator and Status PASS Description ON Normal operation OFF Module fault ON Power up or system reset OFF OFF Processor shut off The scanner modules have several indicators to monitor its status see Figure 7 3 Figure 7 3 Indicator Locations for 1775 S5 and 1775 SR5 Scanner Modules 1775 SR5 1775 85 Scanner Scanner SR 5 EN PASS O AE LO PASS and FAIL indicators Fat Lo 5 lt _ Thumbwheel switch 3 O FORE Forces enabled indicator o ie o H i CH2 O 8 tte r 1 O channel i CH3 O status indicators XMTG RCVG Q M DH DH RDY status indictors 18751 Chapter 7 Diagnostics Methods Remote I O Adapter Faults Figure 7 4 shows the word organization for status file 2 Status File 2 Figure 7 4 Remote I O Device Fault Status Bits Status File 2 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 WordO A A A A A A A A A A Starting I
11. Assignment Command 11241 Symbols can also be used to represent data in memory You must precede a symbolic address with an at sign There are numerous commands that have been defined for operation on the DH DH data link You can program the scanner module to transmit a subset of these commands as listed in Appendix C Table C A The command sent by the scanner is dependent on the addressing method you choose in an assignment command when addressing the data in the remote station Chapter 5 Addressing DH and DH Data Transfers The S5 and SR5 scanners offer four different addressing methods for use in DH and DH assignment commands a PLC 2 Logical Data Addressing PLC 3 Logical Binary Addressing Logical ASCII Data Type Addressing Logical ASCII Word Range Addressing Although the scanner can transmit and receive any of these addressing methods not all remote stations are able to interpret these methods Table 5 A indicates which addressing methods are accepted by other controllers Table 5 A Acceptable Addressing Methods Accepted by Receiving Station PLC 3 Addressing PLC 2 PLC 2 Logical Data X PLC 3 Logical Binary Logical ASCII Data Type Logical ASCII Word Range Using PLC 2 Logical Data A PLC 2 logical data address references a dedicated file in the remote Addressing station This addressing method simply provides an offset into this PLC 2 data table or PLC 2 compatibility file The of
12. flash the LED corresponding to the channel on their front edges Chapter 7 Diagnostics Methods DH DH Indicators 7 10 Also the scanner configured as the master on a peer to peer communication channel declares a peer to peer communication minor fault when it cannot successfully communicate with a slave after two consecutive retries Important Once set the peer to peer and backup communication minor status bit remain set until you reset it Table 7 B 1 0 Channel Indicators for All Scanner Modules Indicator Status Description CHx ON Communication between scanner module and the I O chassis on the corresponding I O channel is properly established Configured for FLASHING There is a fault on one or more of the I O chassis on the 1 0 Scanning corresponding I O channel OFF No I O chassis are configured on the corresponding I O channel or the channel is inactive CHx ON The channel is functioning properly Configured for FLASHING The input file is too small at the processor receiving data The peer to peer slave or master does not exist Communication retry communication OFF The channel is inactive CHx ON The channel is functioning properly Configured for FLASHING The input file is too small at the processor receiving data The backup partner is not responding communication OFF The channel is inactive Table 7 C shows the DH DH status indicators for 1775 S5 SR5 scanner modules Table 7 C D
13. 13 Allocating Memory Before the scanner can transfer data to or from any file in memory the file must exist and be large enough to accommodate the data transfer You can create and allocate a file using memory management through your programming terminal Refer to the user s manual for your programming terminal for detailed information Chapter 6 Programming DH and DH Message Procedures Editing Message Procedures Table 6 B shows how to edit a message procedure through an RS 232 C Using Symbols 6 4 data terminal connected to a 1775 GA module Table 6 B Editing a Message Procedure Through an RS 232 C Data Terminal Prompt if any Keystrokes GA1 gt Enter the edit mode and create the message EDIT H PROC1 RET procedure name The GA module creates the symbol definition for the message procedure name lt EOB gt Enter the insert mode for editing I RET Enter the message procedure commands You must use an EXIT or STOP command to end other commands each procedure HO22 B0 5 N3 1 RET B0 6 2 N3 1 RET 2 RET EXIT RET Exit the insert mode RET Exit from the editing mode E RET GA1 gt You can also use symbols to represent data and data addresses in message commands A symbol can consist of numeric digits alphabetic characters and the underscore _ The scanner does not allow any other special characters Important The first character in a symbol must be a letter A
14. Configuration The I T defaults selection in LIST configures channel 0 for Binary Command Language BCL protocol communication with an industrial terminal see appendix A You can use the industrial terminal as a programming terminal for such functions as ladder programming When you select I T defaults the default values are used as shown in the following table The remaining configuration selections allow you to modify the front panel parameters shown in the following table to something other than their default settings privileges This selection allows you to select operating parameters for channel 0 Refer to the section 0 2 3 4 5 6 8 entitled Privileges under DH or DH Configuration on page 2 17 for a full description of 10 64 65 66 68 the privileges and how to assign them 69 70 71 72 communication rate The rate at which the RS 232 C device communicates to the processor through channel 0 is 9600 bps the communication rate You can select one of the following communication rates 110 bps 150 bps 300 bps 600 bps 1200 bps 1800 bps 2400 bps 4800 bps 9600 bps 19200 bps Set the communication rate by typing the number corresponding to the desired rate An asterisk displays next to the current communication rate parity You can configure channel 0 to communicate using the following parity selections even e even the channel transmits an even parity bit with each character and checks for an even pari
15. PLC 2 Stations page 4 10 for detailed information using logical ASCII data type addressing See chapter 5 Choosing Between DH or The difference between the communication links is the means of DH Communication communication DH link uses a floating master function to handle communication between stations This function allows a station to access the DH based on 3 factors Station s readiness to transmit a message message priority station number In this way the floating master function prevents any single station from hogging the DH link and it enables the stations to become disabled The DH protocol uses a token passing function to handle communication between stations The token is constantly passed from station to station even if no messages are sent Each station obtains time to send a message A station becomes master when it obtains the token Then it can send a message to another station When a station is done communicating the token automatically passes to the next higher station number on the link DH communication is faster than DH communication for configurations of 16 stations or less The delay time for link access increases as you increase the number of stations on the DH link 4 12 Chapter 4 DH and DH Communication Calculating DH and DH Communication Times The time required for the scanner in a local station to send or receive a message with a scanner in another station on a
16. The scanner has an on board switch selectable terminator If the scanner is an end device in the DH or DH link set the terminator switch corresponding to I O channel 4 see Setting the Thumbwheel and Switches page 1 6 Chapter 1 Scanner Hardware and Installation Connecting to the I O Channel Terminal Arm The terminal arm provides connections for four I O communication channels Figure 1 11 Functions of these channels include O communication backup communication peer to peer communication If you select Then the maximum I O channel cable length can be 57 6 kbps 10 000 feet 115 2 kbps 5 000 feet 230 4 kbps 2 000 feet Important If you set the protocol for channel four to a DH or DH link the scanner automatically disables the channel four terminals and enables the DH DH connectors see Connecting to a DH or DH Network page 1 13 Figure 1 11 1 0 Channel Terminal Arm Connections D D Line 1 Line 1 0 Channel3 lt Shield Shield 0 Channel 4 Line 2 Line 2 Blue Line 1 Line 1 0 O Channel lt Shield lt Shield Channel 2 Line 2 h Line 2 Clear e Twinaxial Cable 1770 XT cat no 1770 CD Terminator optional Connects to a Remote I O Device for I O communication or a scanner
17. type of assignment command In the assignment command either the source or the destination but not both can be a remote address A remote address can contain an embedded expression but you cannot embed a remote address in an expression You can substitute symbols or logical addresses for the remote station number For example the remote station being addressed by H N1 0 B15 9 will be the integer value contained in N1 0 Addressing Stations on a Remote Link Chapter 5 Addressing DH and DH Data Transfers In DH protocol you can use the format shown in Figure 5 9 to address a remote station that is located across a bridge on another link If you have the scanner configured for DH protocol using this format causes a communication error to occur Figure 5 9 Example for Addressing a Remote Station Located on a Remote DH Link H 5 13 050 1 B15 9 A AAA k V A A Address delimiter Word address at remote station User number 0 15 if 0 you can drop the period and user number Remote station number 0 077 octal must enter even if 0 Link delimiter Link number 0 32767 decimal If 0 you can leave out but still enter in colon delimitors Bridge delimiter Bridge number 0 077 octal If 0 you can leave out but still enter colon delimitors Remote link type Specify an H in this field D and 0 are acceptable in rare cases when the remote device requires other than
18. Attempt to divide by zero Bad port specifier The character following the is other than H h M m D d O or o User symbol used as part of remote address specification Undefined data following assignment command This error occurs if the modifier UNRPOT is entered instead of UNPROT Error in remote specification e A character other than or following the station number specification eate H045 T e Something other than EOL PROT or UNPROT following a remote source address H012 S5 8 9 Third party transfer In an assignment command both the source and the destination are remote addresses Error in evaluating a PLC 2 address or PLC 2 address greater than 65 535 Zero range specified in an assignment command Word range specified in destination address Destination and source addresses disagree in type B 6 Apendix B DH DH Error Codes Error Code Error Type Associated Meaning Commands 209 Not of DH message type 210 Use of a non PLC 3 type address in a local address operand 211 local In an assignment command one of the local files does not exist or the word specified is beyond the end of the file 212 create During CREATE command execution the scanner was not able to create any symbols 213 A local file exists but the action specified refers to addresses beyond the end of the file Possible causes include e In a word assignment statement the offset is greater than the
19. DH Link i A Computer PLC 5 1775 85 9 9 Family Scanner O10 EETI amp Controller 9 mm fnm TE PLC 3 T ala Controller EET l 1770 KF2 E d Lu i ERN SeriesB 9 ER AAA Module DH 1770 KF2 M Link SeriesB 9 g gt mm ee Jl PLcano Controller iy Advisor 2 9 2 i i o DE Color 1784 T50 EEE Graphic Terminal System 1775 SR5 Scanner 15272 4 3 Chapter 4 DH and DH Communication Communication Terms Solicited and Unsolicited Messages 4 4 Stations communicate with each other by sending two types of messages over a link Type of messages Function command messages either gives writes data to or requests reads data from one station to another reply messages is a station s response to a command message You program command messages into the scanner Execution of a message command is controlled by the message MSG instruction in the ladder program When a scanner receives a command message from another station the module automatically generates the appropriate reply message The local station is the one currently initiating some actions or the one we are currently doing something with All other stations are then remote We can also describe stations in terms of their relationship to a message The station that Is the sends the message transmitting station gets the message receiving station transmits a com
20. Then the command station stores the error STS byte EXT STS byte code in decimal hex in hex 00 not used no error 10 not used 81 30 not used 83 40 not used 84 50 not used 85 60 not used 86 70 not used 87 FO 1 231 FO 2 232 FO 3 233 FO 4 234 FO 5 235 FO 6 236 FO 7 237 FO 8 238 FO 9 239 FO A 240 FO B 241 Appendix B DH DH Error Codes Remote Error Codes B 2 A value of FO hex in the STS byte indicates that the EXT STS byte actually contains the error code for the reply message The meaning of each error code depends on the command message that the local station receives from a remote station Table B A describes the error conditions that the various commands can generate The error codes are listed according to the decimal value that the command at the initiating station stores When a remote station transmits a command the local scanner might issue a reply message that contains one of the error codes listed in Table B A Error codes 81 87 appear in the STS byte of the reply message and codes 231 241 appear in the EXT STS byte The scanner receives remote error codes in a reply to a command it has sent to a remote station The message instruction sets the error bit and records the error in the message control word see Ladder Program page 4 6 The module also stores the local error code in the user symbol ERROR see DH DH Message Procedure Diagnostics page 7 1 The meaning of a
21. You must set the protocol select switches for LIST configurable before the scanner can modify this selection If you set the station number by using the switches see chapter 1 the scanner displays that number as decimal in LIST This line may show two values for the station number selected and actual Both numbers display if they are different and if these two situations occur you changed the station number in line 2 but have not executed a reconfigure to change the actual station number to the new number the scanner in a backed up system assumes an address different from the primary scanner until switchover occurs 2 11 Chapter 2 Contiguring the Scanner through LIST 2 12 3 DH DH Timeouts Select the DH DH Timeouts option to set these timeout values in seconds outgoing message LIST channel remote program Outgoing Message This timeout is the maximum amount of time that the scanner waits for another station to reply to one of the messages The valid entries are 0 to 999 9 In LIST you can enter timeout values as whole numbers or in tenths of seconds For example If you enter a timeout value of The scanner sets the timeout period for 100 100 0 seconds 50 2 50 2 seconds Important If you enter 0 the processor disables the timeout parameter The timeout period applies to each individual transmission Some messages consist of several packets of data because of their size Each message
22. link I O link or LIST configurable selections in the LIST set the protocol If you set the protocol switches for Then you must specify the station address by DH or DH setting the set of eight switches next to the protocol and communication rate switches list configurable using the station number selection in LIST For more information see chapter 2 You can set the communication rate to the following Select For 57 6 kbps I O peer to peer backup DH or DH communication 115 2 kbps I O peer to peer backup or DH communication only 230 4 kbps I O peer to peer or backup communications 1 7 Chapter 1 Scanner Hardware and Installation Not all DH stations are capable of operating above 57 6 kbps You must reference the appropriate users manual for the maximum communication rate for each device DH when operating any of the other communication channels at 230 4 kbps Otherwise I O rack retries and missing inputs in a listen only mode backup system may result ATTENTION Channel 4 may not be configured for DH or Figure 1 5 Setting the Protocol Communication Rate and Station Address for Channel Four gp n Up away from board 3 1 2 4 3 Down toward board b Communication Switch Protocol Switch Rate bps 1 2 3 4 57 6k down down DH down down 115 2k up down DH up down 230 4k down up I O scan down up Configurable up up through LIST
23. location used to save the response data from the remote station destination remote station address to where this command is being sent This address can be any remote station address and can include a bridge address when using DH for example H1 2 3 command block Starting address of the data table address which contains location the command being sent to the remote station Chapter 7 Diagnostics Methods 7 12 Revision A F or later scanners execute the diagnostic assignement command however the command block configuration was modified with the release of the A H scanner Table 7 D and Table 7 E show the command and response that are stored as a series of bytes with the following meaning Table 7 D Command Block Byte Meaning 1 amp 2 number of bytes minus one to follow this word 3 amp 4 no care byte and command byte 5 amp 6 status byte always zero and tns byte always zero 7 amp 8 tns byte always zero and function byte 9thrun command data dependent on command amp function Table 7 E Response Block Byte Meaning 1 amp 2 no care byte and status byte 00 success 3 amp 4 number of bytes to follow this word 5 amp 6 command byte and status byte 7 amp 8 ins word 9thrun response data stored low byte high byte You can use the following diagnostic commands with the diagnostic assignment command Command Byte Function Byte 06 00 Command Diagnostic Loop Diagnostic Status 03 Diagnostic Rea
24. message not used 1 report generation 0 32 767 2 rung comments 3 terminal MACROS 4 DH 5 assistance HELP system context 1 15 type 1 symbol word not used symbols 0 32 767 0 32 767 converted context 1 15 section message word not used procedures 1 report generation 0 32 767 0 32 767 force table context 1 15 force type rack bit 0 status not used 0 input forces enabled disabled 1 output forces enabled disabled 1 forced output 0 15 not used 2 forced input 0 15 not used Appendix A Binary Command Language Commands For example two ways to send the address E3 1 2 0 0 0 are send the mask 3F 6 00111111 followed by the bytes 03 6 0116 0216 0016 0016 0016 send the mask 24 6 00100100 followed by the bytes 0216 0016 You can extend address bytes into address words just as you extend mask bytes into mask words For example the mask 2446 followed by the bytes 0216 FF16 0016 0816 corresponds to the address E3 1 2 0 0 2048 The scanner supports commands for the following functions reading writing and verifying data reading the size of memory sections adding expanding deleting or reducing sections Setting processor operating mode accessing the LIST function setting the default context for communication The sections that follow describe each of these functions Reading Data You can read data from the process
25. s thumbwheel setting and slot location in the processor chassis Selections 6 and 7 only display for scanner number 1 We describe these selections in the rest of this chapter Figure 2 1 LIST Selections for the Scanner m gt S5 1 Chan 1 1 Baud 57 6 115 2 230 4 2 Mode I O 3 Auto Config 4 Reconfiglkp 5 1 0 Scan Config 73 6 Peer Master Config m gt Mode Selection 1 Inactive 2 1 0 3 Peer Master 4 Peer Slave 5 Backup Comm Enter NExt gt 7 Peer Slave Config 8 Backup Comm Config Enter Next 5 1 Chan 4 1 Baud 57 6 115 2 230 4 2 Mode I O 3 Auto Config 4 Reconfig 5 1 0 Scan Config 6 Peer Master Config y Mode Selection 1 Inactive 2 1 0 3 Peer Master 4 Peer Slave 5 Backup Comm 6 DH 7 DH Enter NExt gt 7 Peer Slave Config 8 Backup Config 9 DH DH Config Enter Next gt 51 1 0 76 2 100 176 3 200 276 4 300 376 Enter Next gt 51 Chan 0 1 LT Defaults 2 Privileges 3 Baud 4 Parity Even Odd None 5 Stopbits 1 1 52 6 Chan Timeout 10000 ms 7 Reconfig Enter Next Front Display Privileges 3 10 67 69 70 Enter Next m gt Chan 0 Privileges Enter Next gt Enter Timeout gt 5 1 Chan 0 Baud 110 Baud 150 Baud 300 Baud 600 Baud 1200 Baud 1800 Baud 2400 Baud 4800 Baud 9 9600 Baud 10 19200 Baud NOoORwoOnN r 5 Chan 1 1 0 1 003
26. where you generate them Using Expressions Chapter 6 Programming DH and DH Message Procedures Expressions use operators to combine two or more numeric values into a single value Table 6 C lists the operators that you can use in an expression We list these operators from highest priority 1 to lowest priority 10 The result of an expression depends on the order the scanner executes the operations The order of execution depends on the type of operator and on left to right placement within the expression The result of an expression is a 32 bit value If the high order bits are not significant that is if they can be truncated without changing the value of the expression then a data field that is less than 32 bits long can store the value Attempting to put a value into a field that is too small results in error code 189 see appendix B Table 6 C Expression Operators Operator Order of Execution Description l 1 bit operator NOT 1 logical complement or BNOT 1 bitwise 32 bit complement 2 division of 32 bits 3 addition of 32 bits 3 subtraction of 32 bits lt lt 4 left arithmetic shift gt gt 4 right arithmetic shift amp oBND f 5 bitwise 32bit AND orBXOR 6 biwise32btEXCLUSVEOR or BOR 7 bitwise 32 bit OR EQ 8 compare equals GT 8 compare greater than GE 8 compare greater or equal LT 8 compare less than LE 8 compare less or equal NE 8 compare not
27. 0 cece eee neces 4 5 Data Transfers cic cciiwad ERR RRREEEXEZXTPLRIReRNS 4 8 Choosing Between DH or DH Communication 4 12 Operating Backup Configurations on a DH or DH Link 4 14 Operating Multiple Links in One System lusus 4 14 Table of Contents Addressing DH and DH Data Transfers Chapter Objectives 0 0 0 e eee eee eee eee Addressing Field Parameters 0000 cece ee eeas Interpreting Addresses 00 00 c eee eee eens Addressing Data 2scids eaves eddewwda eo eGespeseens Rad Specifying Addresses 000 cee eee eee eee Using PLC 2 Logical Data Addressing Lue Using PLC 3 Logical Binary Addressing 05 Using Logical ASCII Addressing 00000e ues Addressing Stations on a Local Link 00000 0 Addressing Stations on a Remote Link 05 Assignment Command 0 0c eee eee eee Programming Examples of Assignment Commands Programming DH and DH Message Procedures Chapter Objectives 0000 e eee eee eee eee Message Instruction Considerations LL Editing the Message Instruction 00eeeeeaee Editing Message Procedures 22 0e0eee eae Using Symbols 24v assu ERR Oren ee ek Shan Using User Symbols 0 0 0 cece eee eee ee Using System Symbols 0 0 0 c cece eee eee ee Using Expressio
28. 19 shows that input file 1 contains 20 octal words You can create a larger file by entering the last word desired in the file when prompted for the file number in LIST By entering 11 50 for the input file the system will automatically increase input file 1 to 50 octal words To delete slave entries from the list press slave entry d Return Backup Communications Configuration When you configure a channel for backup communication you must enter the following parameters Parameter Description Resident number identifies the system being configured on the channel The resident number must be different from the partner number and selected from numbers 81 through 89 Partner number identifies the other system on the channel The partner number must differ from the resident number and selected from number 81 through 89 Input file identifies the file that receives data from the partner The input file must be in the input image section of the data table If you do not make a selection the file defaults to input file 1 This file must be large enough to store the data from the partner system s output file Otherwise the processor sets the backup communication minor fault bit Output file identifies the file that sends data to the partner The output file must be in the output image section of the data table If you do not make a selection the file defaults to output file 1 LIST displays the size of the input and output fi
29. 2 0 2 005 2 2 3 006 2 6 l 4 003 2 2 5 005 4 4 I F Enter Next gt gt Enter Master gt r 3 5 Chan 1 Slaves Slave 86 3 S5 Chan 1 Slave 86 Slave 82 1 Input File 11 0 20 Enter Input File Slave 84 2 Output File 01 0 20 Enter Output File S5 Chan 1 Peer Master Enter Next gt 1 Master 1 2 Slaves Enter Next gt S5 Chan 1 Peer Slave 1 Slave Enter Slave gt 2 Master 1 Enter Master gt 3 Input File 11 0 50 Enter Input File gt 4 Output File 01 0 20 gt Enter Output File gt Enter Next gt S5 Chan 1 Backup Comm 1 Resident 1 Enter Resident gt 2 Partner 2 Enter Partner gt 3 Input File 11 0 50 Enter Input File gt 4 Output File 01 0 gt 20 gt Enter Output File gt Enter Next gt Enter Station Number Enter Leading 0 For Octal Number gt 3 51 Chan 4 1 Node Mode On line Off line 2 Station Number 030 Selected 030 Actual 3 DH DH Timeouts gp 1 4 Backup Operation DH DH Timeouts 5 Send Unprotected 1 Outgoing Message 5 0 Sec 6 Accept Upload Download 2 ListChannel 300 0 Sec 7 Accept Writes 3 Remote Program 300 0 Sec 8 Input File List 3 See page 2 16 Enter Next gt 9 Privileges 10 D
30. 2 bytes of destination and source address The D would provide 1 byte and the 0 provides 6 bytes Remote station delimiter For data locations at remote stations a pound sign followed by the remote link type H for DH or DH communication and the remote station number precede the data address Figure 5 10 5 11 Chapter 5 Addressing DH and DH Data Transfers Figure 5 10 Example Assignment Command that Addresses a Remote Station H024 B45 21 112 33 A A A L Source Address Address Delimiter Assignment Command Destination Address Address Delimiter Remote Station Number octal Data Highway Port Identifier Remote Station Delimiter 11242 Assignment Command You can use the assignment command to copy data from a source location to a destination location Table 6 D Source types include direct values procedural user symbols interprocedural user symbols logical addresses local symbolic addresses global symbolic addresses expressions Destination types include procedural user symbols except when the source is remote interprocedural user symbols except when the source is remote logical addresses local symbolic addresses global symbolic addresses You can use any source type listed above with any destination If the destination is a user symbol the scanner checks to see if it has previously been defined If the user symbol
31. 5 Figure 6 5 Format for Adding Comments to Command Lines COUNT 0 INITIALIZE COUNTER Comment Comment Delimiter Command 11246 Anything that appears between a semicolon and the end of the command line is a comment Comments can be any length The end of the command line and therefore the end of your comment is delimited by the carriage return and line feed pair of characters Programming Examples for Figure 6 6 and Figure 6 7 provide examples of DH or DH message a Message Procedure procedures that monitor the state of a status bit in a remote station Figure 6 6 Example Message Procedure that Executes Read and Write Commands over a DH or DH Procedure DATA A 10 B SN0 0 procedural user symbol IF 10 012 017 D2 0 HO11 D6 0 read word D6 0 from station 11 into word D2 0 IF 10 012 016 HO11 D6 1 D2 1 write word D2 1 into word D6 1 of station 11 IF A EQ B GOTO LABEL EXIT ABEL D7 H011 D3 note that the destination file must be 2 the sourc file HO11 N3 5 N2 4 10 write 10 words starting at word N2 4 into Station 11 starting at word N3 5 Chapter 6 Programming DH and DH Message Procedures Figure 6 7 Example Message Procedure that Monitors the State of a Bit in a Remote Station and Records Any Error Condition Procedure REM_TURNON This procedure monitors the state of a bit in a remote station When that bit goes true the scanner
32. Address unknown 06 Access not allowed 08 Address not complete OF No privilege The following response block shows a successful read modify write command STX OSC SIZ RSP ETX CHK 02 01 01 00 03 07 Appendix A Binary Command Language Verify Block Command Hex 15 Parameters Starting address number of words data to compare with memory Description The processor can compare a block of data in memory to reference data from an external device The following command block verifies the first three words in the binary section of the data table section eight STX 02 ISC SIZ 0c CMD 24 DAT ETX CHK o8 00 03 00 04 41 Et 02 E 15 03 89 The data bytes store address mask 24 hex first address byte 08 hex second address byte 00 hex lower byte of size word 03 hex upper byte of size word 00 hex lower byte of the first data word 04 hex upper byte of the first data word 41 hex lower byte of the second data word E1 hex upper byte of the second data word 02 hex lower byte of the third data word E3 hex upper byte of the third data word 15 hex The processor responds to a verify block command with one of the following response codes Response Codes Hex Description 00 Success 04 Address unknown 05 Address invalid end of section 06 Access not allowed 08 Address not complete
33. DH or DH link generally depends on the number of stations on the DH link messages transmitted from active stations bytes of data of all transmitted messages message requests that are queued ahead of the subject message Table 4 C lists typical I O scan times and throughput times for a DH or a DH configuration The throughput time is the execution time for the DH or DH message This time starts with setting the enable bit and ends with setting the done bit in the ladder program of the station sending or receiving the message When calculating these times the DH DH link had one other station on the link and the message instruction was sending 10 words to the second station The second station was not transferring any words Table 4 C Throughput Times for a DH or DH Configuration in Milliseconds Number of Active Throughput Times 1 0 Channels DH 0 66 1 67 2 67 3 67 Important I O communication channels can affect the time required to complete DH functions initiated on the same scanner If any of the devices in the I O rack lists are not responding to the scanner retrys then the time to execute some programming terminal DH functions such as ladder logic searches will take longer 4 13 Chapter 4 DH and DH Communication Operating Backup Configurations on a DH or DH Link Operating Multiple Links in One System 4 14 When using a scanner for DH or DH communication you can set up two ty
34. Figure 3 2 shows the communication flow between master and slave controllers on a peer to peer channel Figure 3 2 Communication Flow Between Master and Slave Controllers on a Peer to Peer Communication Channel Slave A Master Slave B Processor Processor Processor Memory Memory Memory output file A output file B gt outputfile gt input fle B ouput fie Processor Memory input file 2 input file Each input file must be large enough to store the data from the corresponding output file Otherwise a peer to peer communication minor T fault occurs Chapter 3 I O Communication Programming Peer to Peer Communication Programming PLC 3 family controllers for peer to peer communication requires that the ladder program in the master transfers the appropriate data to its output file receiving slave knows the proper use for each word in its input file The controller automatically handles the actual data transfer Each slave s input file must be equal to or larger than the master s output file Otherwise a peer to peer communication minor fault occurs Figure 3 3 shows an example of the ladder rungs that transfer data to output file FO001 in the master controller The rungs that move data into the output file are unconditional If they are conditioned old data transfers whenever the rung conditions are false because the transfer occurs rega
35. Language communicate with a PLC 3 family controller through channel 0 of the front panel B DH DH Error Codes DH and DH error codes and meanings C DH and DH DH and DH commands supported by the scanner Command Set D Specifications Scanner operating and environmental specifications Preface Audience Vocabulary In this manual we assume that you know how to program and operate an Allen Bradley PLC 3 or PLC 3 10 programmable controller system If you are not familiar with these controllers refer to the following publications Publication Title 1770 6 2 2 Data Highway Cable and Data Highway Plus Installation Manual 1770 6 5 15 PLC 3 Industrial Terminal cat no 1770 T4 User s Manual 1770 6 5 16 Data Highway Data Highway Plus Protocol Command Set User s Manual 1771 6 5 83 Remote I O Adapter Module cat no 1771 ASB User s Manual 1775 6 3 1 PLC 3 Backup Concepts Manual 1775 6 4 1 PLC 3 Family Programming Manual 1775 6 7 1 PLC 3 Family Installation and Operation Manual 1784 6 5 1 Industrial Terminal cat no 1784 T50 User s Manual 6200 6 5 3 PLC 3 Programming Software User s Manual We refer to certain types of equipment and terms throughout this manual To make the manual easier for you to read and understand we avoid repeating full product names where possible We refer to the As the I O Scanner Communication Adapter Module scanner cat no 1775 S5 SR5 PLC 3 or PLC 3 10 programmable contro
36. Link A4 n Zi Computer w PLC 5 1775 S5 o Family a Scanner O10 amp Controller o Z cen PLC 3 ae Controller 1770 KF2 QR im SeiesB coece zT nn Module DH 1770 KF2 od Link Series B 9 cove S qu I Module EER PLC 3 10 Controller al Advisor 2 2 d hn vf Color 1784 T50 UC S Graphic Terminal System 1775 SR5 Scanner 15272 Chapter 1 Scanner Hardware and Installation To make connections to the scanner connect the 1770 CD cable to the screw terminals on the 3 pin connector Figure 1 10 Figure 1 10 Connecting the Scanner to a DH or DH Terminals on the scanner 1 Clear Clear 1 Connecting the LD scanner to another SH Shield Shield SH scanner on a DH or Blue Blue DH link 2 FO 2 Twinaxial Cable cat no 1770 CD 1 Z Clear Clear ec Connecting the SH Shield Shield QL scanner to a Blue Blue e oz computer via a 2 eo e 15 Pin Connector computer interface ENS Ow o2 on a Communication module on a DH link On Interface Module O Qe T Oe On Oo E Connecting the 1 QD Clear Clear b 15 Pin Connector scanner to a O9 _ on a Communication SH Shield Shield On computer via a Series o 4 Interface Module B 1770 KF2 module 9 Blue Blue ec OZ cat no 1770 KF2 on a DH or DH link OS series B OP s sei Q o md Q eo o Qe Oo O e 15408
37. N BP nd e nd bh nd N 2 H The following subsections describe these selections 2 10 Chapter 2 Configuring the Scanner through LIST 1 Node Mode Select the NODE MODE option from the configuration screen to allow or disallow the station communicating on the link By selecting NoDE MODE you can configure the channel to be online or offline If you select Then the channel is on line an active station on the link off line inactive and the DH DH disable indicator is turned on Important A reconfigure is not necessary to change this selection The NODE MODE changes to the opposite selection and takes affect immediately An asterisk displays in front of the selected modes 2 Station Number Select the STATION NUMBER option from the configuration screen to identify the PLC 3 station on the DH or DH link You can specify an octal station number by starting it with a leading 0 Otherwise the scanner treats it as a decimal number Allowable station numbers are for 0 to 376 octal DH 0 to 77 octal DH The number 377 octal is illegal Entering 377 as the station number automatically disables the channel and you cannot enable it again until you select a different station number in LIST If you make no selection the scanner sets the station number for 377 octal 255 decimal by default Important
38. Z The scanner recognizes both upper case and lower case letters in a symbol as different characters For example ASYMBOL and Asymbol are two different symbols A symbol can be any length but it must be unique in its first eight characters For example the scanner can distinguish SYMBOL A and SYMBOL B in a message procedure but NEW SYMBOL A and NEW SYMBOL B are not Important The scanner does not flag indistinguishable symbols as programming errors It treats similar symbols as equivalents Chapter 6 Programming DH and DH Message Procedures You cannot use certain words and character combinations as symbols because they are reserved for special uses in message procedures The reserved words are CREATE DELETE ERROR EXIT GOTO IF a ON ERROR STOP PROT UNPRO You also cannot use any abbreviated form of the above words For example you cannot use the single letter C as a symbol because it is an abbreviation of the word CREATE Similarly PRO is an invalid symbol The two types of symbols are Figure 6 2 user symbols System symbols Figure 6 2 Types of Symbols System Symbol Generate this symbol with the Edit command for a procedure name or a Create command for a symbolic address User Symbol Generate this symbolic value through the assignment command Interprocedural Procedural Procedure Name Symbolic Address Applies to the procedure Applies only to t
39. a least significant byte of the address 01 hex second byte of the address 20 hex third byte of the address 00 hex most significant byte of the address 01 hex a least significant byte of the address 02 hex most significant byte of the address 00 hex a least significant byte of first data word 20 hex most significant byte of second data word 01 hex The processor response to a write block physical command is the same as the response to a write block command see the section entitled write block command After the download operation is complete send a reset command 09 hex to exit the shutdown mode The following command block uses the reset command STX ISC SIZ CMD ETX CHK 02 06 01 09 03 15 The processor does not issue any response to a reset command so just continue communication by sending the next command However the reset command resets the sequence counts Appendix A Binary Command Language Example Download The following sequence of command and response blocks performs a download The download includes 4DD hex words and is performed in 10 hex word blocks All values are shown in hexadecimal Device STX ISC SIZ CMD ETX CHK 02 01 06 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 0
40. address format The exceptions are read I O word command which requires an I O address read block physical and write block physical commands used for uploading and downloading respectively which use physical addresses A detailed description of processor extended addressing appears in the PLC 3 Family Controller Programming Manual publication 1775 6 4 1 Processor memory organization is summarized in Table A E When you send an extended address to the processor it must follow a mask byte The mask byte tells the processor which address levels the following address defines and which levels default A bit in the mask which is set to Indicates that the 1 corresponding level of memory is specified in the address to follow default value is used for the corresponding level of memory Bit 0 in the mask corresponds to the major area Bits 1 to 7 in the mask each correspond to the next level in the specified section For example in the data table area 3 bit 1 corresponds to the context and bit 2 corresponds to the data table section e g output input You can extend the mask byte into a mask word to specify more than 7 levels of an address by sending a byte with the value FF hex followed by two bytes of the mask word This is for future expansion of processor extended addressing as only 6 levels are presently used Table A E The default value for the major memory area bit 0 context bit 1 3 data tab
41. and 1 byte SIZE field are missing in the command message The ADDR value is odd it does not specify a word address The value SIZE is 0 The value SIZE is greater than 244 The SIZE value specifies an odd number of bytes Incomplete bit description because the number of bytes after the TNSW is not a multiple of four A2 byte ADDR field is expected after the TNSW word but only one byte is present Anodd number of data bytes in the command packet The ADDR value is odd it does not specify a word address More than one byte of data is after the byte address e Number of bytes to read is odd e Number of bytes to read is zero Number of bytes to read is greater than the maximum allowed in a reply packet 244 e Sum of packet offset and size of data in words is greater than 65 535 e Sum of packet offset and size of data in words is greater than the total transaction size More than four bytes of data exist after the address in the command message Less than two bytes of data are after the end of the block address An odd number of data bytes is after the end of the block address Sum of packet offset and size values specifies more than 65 535 Sum of packet offset and size is greater than total transaction size The local scanner has executed a shutdown request to the local PLC 3 controller B 3 Appendix B DH DH Error Codes Error Code Error Type Associated Meaning Commands 84 diagnosti
42. and the backup processor Not selected remains the same both before and after switchover The primary and backup processors must have unique station numbers Regardless of which mode you select both the primary and the backup DH and DH channels are active There is no selection for the backup DH or DH channel to remain silent on the link until switchover When you select backup operation you assign the same DH or DH station number to both the scanner module in the primary processor and the one in the backup processor As long as the primary processor is controlling the outputs the station address of the DH or DH channel in the backup processor is modified Table 2 B and Table 2 C show the station number modifications for DH and DH respectively At switchover the DH or DH station number in the backup processor assumes the station address assigned to it with the LIST function Table 2 B DH Station Numbers for 1775 S5 SR5 Modules If the station address between The backup scanner module assumes a station address that is 000 and 276 300g and 376g 100g higher than the assigned station number 100g lower than the assigned station number Important Do not give the 1775 85 SR5 module the reserved station address of 3778 and when you select the backup operation you cannot give the module a station address of 277g 2 13 Chapter 2 Contiguring the Scanner through LIST Table 2 C DH Station Numbers f
43. another procedure calls executes the current procedure the EXIT command returns control to the calling procedure at the line following the execute statement The format for the EXIT command is the single letter E without any modifiers or parameters Each main procedure and nested procedure must end with either an EXIT command or a STOP command The EXIT command is preferred because the STOP command results in error 179 see appendix B The commands in a message procedure normally execute sequentially The GOTO command can change the order of execution The parameter for a GOTO command is a label Labels are signposts or tags that mark a location within the message procedure To generate a label enter it on any one of the lines in a message procedure For example LABEL A Nothing else can appear on the same line with the label The label itself must conform to the same rules of construction as user symbols do Important The trailing colon is required when you first generate the label but do not use the colon any other time you refer to the label When a GOTO command executes execution of the message procedure resumes with the first command after the label specified in the GOTO command You cannot use the GOTO command to jump from one procedure to another even if the procedures are nested Chapter 6 Programming DH and DH Message Procedures IF Command The IF command makes logical decisions in the message proc
44. equal AND 9 logical AND OR 10 logical OR You can nest expressions within other expressions by enclosing the inner expression within parentheses Chapter 6 Programming DH and DH Message Procedures For example the following command stores the value 12 in word 45 of binary file 67 B67 45 643 2 This occurs because the scanner multiplies before it adds If an expression contains several operators within the same order of execution the scanner executes those operators in the left to right order in which they appear within the expression You can enter extra sets of parentheses to change the order of execution In such cases the scanner evaluates the expression within the inner most set of parentheses first For example the following command stores the value 2 in word 45 of binary file 67 is the operator for division B67 45 36 6 3 2 You can use expressions anywhere for direct numeric values in a message procedure including within an address field For example in the following statement the expression WORD 3 specifies the address of a word within binary file 67 B67 WORD 3 5 The parentheses are necessary to indicate that 3 is part of the word address in this case Interpreting Expressions Within an expression the scanner always interprets direct numeric values as decimal base 10 numbers unless you indicate that they are octal base 8 Specify an octal value by starting the numb
45. file size e In a word range assignment statement the sum of the base address and the offset is greater than the total file size e Ina file assignment statement the destination file is smaller than the source file If the source file is remote a single packet is fetched from the remote station s file 214 Local source and destination files differ in size 215 The value resulting from operations specified on the left side of an assignment statement does not fit into the destination specified on the right side e The source is in the H section and the destination is in the N section but the number is too large i e outside the range 32768 to 432767 e A word is transferred from a binary section I O or B section to the N or C section and the high order bit is a 1 The destination is in the decimal section but the number is not a valid BCD bit pattern 217 More than eight levels specified in file address 218 File size changed between packets of a multi packet transaction Destination not created 230 Reply packet too small 231 PLC 3 read and Error in converting the block address major section 63 context 15 or section write 15 232 PLC 3 read and Three or fewer addressing levels specified for a PLC 3 word address write 233 PLC 3 read and Conversion of a file address to a block address resulted in more than nine write addressing levels 234 PLC 3 read and Symbolic address not found write 235 PLC 3 read and Symbo
46. files with an 8 or 9 in their addresses are not used for read write access by a PLC 2 station The PLC 2 station can use either protected or unprotected commands to access its assigned PLC 3 file However the PLC 2 station cannot access its assigned file until that file is created and allocated at the PLC 3 station To create a file refer to the user s manual for your programming terminal You can have two PLC 3 stations communicate with each other as if they were PLC 2 stations To do this allocate the appropriate PLC 2 addressing format see chapter 5 in the assignment commands Similarly a computer can send PLC 2 commands to a PLC 3 station by using the appropriate message packet formats 4 11 Chapter 4 DH and DH Communication PLC 4 Stations PLC 4 stations can only communicate on a DH To read or write to a PLC 4 station you can send either protected or unprotected commands Switches at the 1773 KA module specify whether the PLC 4 station accepts unprotected or protected commands respectively through the 2 and 3 on the second row of switches 1 and 3 on the third row of switches DH port of the 1773 KA module RS 232 C port of the 1773 KA module In all cases if the switch is set to the closed position the module accepts that type of command PLC 5 Stations The PLC 3 processor can read write to a PLC 5 family processor in two ways as if the PLC 5 processor was a PLC 2 family processor See
47. following response codes Response Codes Hex Description 00 Success 03 Unavailable context 0 06 Access not allowed OF No privilege The following example response block shows a successful set operating context command STX OSC SIZ RSP ETX CHK 02 11 01 00 03 17 A 37 Introduction Local Error Codes Reply Error Codes Appendix DH DH Error Codes This appendix describes the error codes that the scanner uses to report DH DH communication errors Errors are of three types local reply remote The scanner generates local errors while trying to execute one of its own DH DH message procedures The message instruction sets the erro bit and records the error in the message control word see Ladder Program page 4 6 The module also stores the local error codes in the user symbol ERROR see DH DH Message Procedure Diagnostics page 7 1 Possible local errors and their meanings are listed in Table B A The scanner generates reply errors while trying to respond to a command message received from a remote DH or DH station The scanner inserts the reply error code in the STS or EXT STS bytes of any reply message packet it transmits to a remote station For reply errors there is a direct correlation between the error codes in the STS and EXT STS bytes of reply messages and the error codes reported at the remote station If the scanner generates these codes
48. in another PLC 3 or PLC 3 10 chassis for peer to peer or backup communication If the scanner is at the end of the channel set the terminator switch corresponding to the channel number If the channel is configured for I O at 230 4 kbps disable the terminator for the channel and install an external 82 ohm terminator 15409 Chapter 1 Scanner Hardware and Installation Electrostatic Discharge ATTENTION Electrostatic discharge can degrade performance or damage the module Electrostatic discharge can damage integrated circuits or semiconductors in the scanner if you touch backplane connector pins It can also damage the scanner when you set configuration plugs and or switches inside the module Avoid electrostatic damage by observing the following precautions Touch a grounded object to rid yourself of charge before handling the module Do not touch the backplane connector or connector pins When not in use keep the module in its static shield bag 1 17 Chapter Objectives Accessing the LIST Function Configuring the Scanner through LIST You use LIST function to configure the scanner This chapter describes the LIST selections Read this chapter to learn how to access the LIST function configure the front panel and channel 0 through scanner number 1 configure communication channels for I O backup or peer to peer communication configure communication channel 4 for I O DH or DH communication Yo
49. one in which the error occurred For example a message procedure can contain the command ON ERROR RECOVER When an error occurs in the procedure the ON ERROR command causes the scanner to execute the procedure named RECOVER The procedure RECOVER might be a routine for monitoring error codes After executing RECOVER the scanner resumes executing the original procedure at the command line following the one where the error occurred 7 1 Chapter 7 Diagnostics Methods 7 2 Error Monitoring To aid in error monitoring the scanner maintains a 26 word error block in the module status area of memory The extended address for the beginning of the error block file is SE2 3 thumbwheel number 3 5 4 0 You can access this error block by displaying it on the controller front panel displayed in hex using the data monitor mode of your programming terminal displayed in hex using the move status MVS command in the ladder program using procedure commands in the following modules 1775 S5 or 1775 SR5 module 1775 GA module 1775 KA module Error Block This error block contains the following information Word Contains the 0 last generated error code see appendix B 1 total number of errors that have occurred 2 7 error information for message task 1 8 13 error information for message task 2 14 19 error information for message task 3 20 25 error information for message task 4 Four grou
50. packet requires a separate transmission Therefore the timeout restarts for each packet LIST Channel This timeout detects a lack of activity by a station on the link still having an allocated LIST resource Set this value high enough to prevent a timeout while running LIST but not so high that a station on the link keeps the LIST resource allocated unnecessarily Once this time expires the next list selection you enter displays the initial list menu You can then continue through your selections Important This timeout takes affect anywhere from one to two times the value you enter through LIST Remote Program This timeout detects a lack of activity by a previously connected programming station Should a connected programming station be abruptly disconnected from the link this timeout would make sure that the edit resource and histogram resources are returned to the scanner Important This timeout takes affect anywhere from one to two times the value you enter through LIST Chapter 2 Configuring the Scanner through LIST 4 Backup Operation Select the Backup Operation option from the configuration screen to configure the DH and DH station numbers when backed up See Table 2 A Table 2 A Backup Operation Options If backup is The DH and DH station number of the backup scanner module Selected is automatically modified before and after switchover This allows you to have identical configurations in both the primary
51. peer to peer communication channel 2 8 3 4 P partner 2 9 3 8 peer to peer communication installation 1 16 LIST selections 2 8 master 2 8 operation 3 3 3 5 programming 3 5 slave 2 8 timing 3 10 3 12 PLC communication on DH or DH 4 1 5 2 5 3 PLC 2 5 3 PLC 5 4 12 polling 1 5 2 5 pound sign delimiter 5 10 5 11 privileges 4 9 procedure names 6 6 6 15 programming terminal 1 13 2 1 7 2 protected commands 4 9 4 12 5 14 protocol A 1 dip switch for channel four 2 3 switch for channel four 1 7 R rack range 2 20 reconfiguration 2 22 reconfigure 2 5 remote error codes B 2 link type 5 11 Index stations 5 10 5 11 remote error codes B 2 reply error codes B 1 B 3 resident 2 9 3 8 S scanning sequence list 2 6 send unprotected LIST selection 2 14 shift operators 6 11 slave number 2 8 solicited messages 4 4 specifications D 1 station address 2 11 2 13 defined 4 1 interface module 4 1 number 2 11 stop bits LIST selection 2 21 STOP command 6 13 6 17 switch settings backup system 1 10 communication rate for channel four 1 8 protocol for channel four 1 8 station number for DH DH station 1 9 terminator 1 6 symbolic addresses 6 6 6 14 symbols 6 4 6 6 reserved words 6 5 system symbols 6 5 6 6 6 14 scope 6 6 T terminator 1 6 1 15 throughput time 4 13 thumbwheel switch 1 2 1 6 1 1
52. position before writing If the keyswitch is set to Then the scanner memory protect on does not accept write commands and generates error code 86 see appendix B data change or memory protect off accepts write commands An asterisk displays in front of this selection to indicate that it is selected 2 15 Chapter 2 Contiguring the Scanner through LIST 2 16 8 Input File List PLC 2 Compatibility Mode Only Select the Input File List option from the configuration screen for a list of files that the scanner accesses when receiving data using PLC 2 logical data addressing see chapter 5 When a PLC 2 command comes in from a station on a DH or DH link the scanner accesses the input file associated with that remote station number You must make sure the input file is created in memory If you do not list an input file for a remote station the scanner assigns a default file to it The default file number matches the remote station number except for remote station zero which is assigned input file 8 PLC 2 compatible remote station number in octal Assigned input file for read write access 000 1008 001 1001 002 1002 003 1003 004 1004 005 1005 006 1006 007 1007 010 1010 011 1011 012 1012 077 1077 100 1100 Station address 000 is assigned to input file 1008 Otherwise PLC 3 input files with an 8 or 9 in their addresses are not used for read write access by a PLC 2 station If you do not
53. program by putting the processor in test mode 72 Perform a physical write 73 Accept keyboard input for GA Basic report generation or message procedure commands By removing privilege 73 you can prevent an operator or other device such as a bar code reader from allocating a device on the channel 74 Abort a GA Basic task in LIST To modify a privilege do the following If you want to Then add a privilege enter the privilege number make a privilege independent of the memory protect keyswitch enter the privilege number followed by I remove a privilege enter the privilege number followed by D 10 DH DH Switch Settings You can determine the state of the DH DH switch settings without removing the scanner from the chassis Select the DH DH Switch Settings from the configuration screen to determine the state of the DH DH switch settings Chapter 2 Configuring the Scanner through LIST When you select this option the programming terminal displays DH DH SET UP SWITCH SETTINGS VIEW FROM TOP OF MODULE S1 S2 MODULE DOWN ON x X x xX X x x FRONT UP OFF X X xX X X SWITCH 8 yq 6 55 rE g 2 SET Z Lm STATION NUMBER IN OCTAL MODE BAUD CURRENT SELECTION 63 DH 57 6KB 1 EXIT THIS MENU NOTE SWITCH CHANGES ARE ONLY READ AFTER POWER UP ENTER NEXT
54. receiving station stores that same data at the indicated address No error checking is done for compatible data table areas To format a logical ASCII word range address you enclose the address parameters in single quotes Format Example address size N55 0 15 Symbols are allowed inside the single quotes if they are defined in the remote station Figure 5 7 Example of Logical ASCII Address that Accesses the 17th Word in File 4 N4 17 A Ill Logical ASCII word range delimiter Word address in memory Logical ASCII word range delimiter Address delimiter 5 9 Chapter 5 Addressing DH and DH Data Transfers Addressing Stations on a Local Link 5 10 Figure 5 8 shows the format for addressing data at remote stations on a local link The pound sign specifies a remote station on a DH or DH link Figure 5 8 Example for Addressing a Word in a Remote Station on a Local DH DH Link H 020 B 15 9 t Word address at remote station Address delimiter Remote station number 20 octal Port indentification for data highway port Remote station delimiter H 020 WORD_9 L_ Symbolic word address defined at remote station Remote station number 20 octal Port indentifier for data highway port Remote station delimiter 15420 Remote station addresses have the following restrictions You can only use a remote address with the single equals sign
55. rules given in Using Symbols page 6 4 The character delimits a system symbol and distinguishes it from a user symbols Symbol Type Description procedure A procedure name is a way of referring to a message procedure You assign a names procedure name at the time you generate or edit the message procedure One procedure can execute a second procedure simply by stating the name of that second procedure This allows for nesting of procedures up to 3 levels deep symbolic A symbolic address is another way of representing the logical address of data addresses You can generate a symbolic address by using the CREATE command You can use a symbolic address for a logical address anywhere in a message procedure The system symbols area of memory stores all symbolic addresses scope of System symbols can be either local or global in scope The scanner recognizes system a global system symbol in any context It recognizes a local system symbol only symbols in the operating context that the system symbol is created in For detailed information on context refer to the PLC 3 Family Controller Programming Manual publication 1775 6 4 1 At the time you generate the system symbol you specify it to be local or global If you do not specify the scope of the system symbol it defaults to local Important Do not confuse the terms local and global symbols with local and remote stations Both local and global symbols have meaning only at the station
56. services to help our customers continuously improve quality productivity and time to market These products and services not only control individual machines but integrate the manufacturing process while providing access to vital plant floor data that can be used to support decision making throughout the enterprise ASIA PACIFIC CANADA LATIN AMERICA HEADQUARTERS HEADQUARTERS HEADQUARTERS Allen Bradley Hong Kong Allen Bradley Canada Allen Bradley Limited Limited 1201 South Second Street Room 1006 Block B Sea 135 Dundas Street Milwaukee WI 53204 USA View Estate Cambridge Ontario NIR Tel 1 414 382 2000 28 Watson Road 5X1 Telex 43 11 016 Hong Kong Canada FAX 1 414 382 2400 Tel 852 887 4788 Tel 1 519 623 1810 Telex 780 64347 FAX 1 519 623 8930 FAX 852 510 9436 PN 955113 06 Copyright 1991 Allen Bradley Company Inc Printed in USA
57. that either the transmitting or receiving controller could be the master provided that the other controller is a slave The master communicates with each slave on the channel but the slaves communicate only with the master Figure 3 4 Example Rungs in the Receiving Controller on a Peer to peer Communication Channel EQU A B 00007 A WI001 0005 0000000000000110 12 B WN001 0002 6 MVE C0009 FILES FROM ATO R EN A FI001 0010 ON R FB001 0000 15 COUNTER C0009 C0009 POS LEN 0 10 ER MODE ALL SCAN 13 Chapter 3 I O Communication Important Remember to reset the counter for the MVF or the move operation does not function properly Backup Communication You can use the backup communication with the PLC 3 or PLC 3 10 backup feature The backup feature has an I O listening mode that enables the backup system to monitor input data To transfer other information to the backup system you can install a backup communication channel Figure 3 5 With a backup communication channel you can program data transfers between the primary and backup controller Figure 3 5 Then when the primary controller shuts down the backup controller has up to date data for running your application Such data could be storage block transfer timer or counter information Figure 3 5 Using a Backup Communication Channel Primary System Backup System EI Backup cable for setting up type of switchov
58. the enable bit 16 and the latch enable bit 12 scanner receives the message instruction sets the request bit 17 scanner begins operation sets the busy bit 14 scanner completes operation resets the busy bit 14 and sets either the done bit 15 or the error bit 13 rung becomes false resets the request bit 17 busy bit 140 enable bit 16 and the latch enable bit 12 rung becomes true a second time resets the done bit 15 or the error bit 13 message errors appear sets the error bit 13 and records the error code in bits 00 thru 07 You can program the message instruction with either a single message command see chapter 6 that can be up to 76 characters long the name of a DH DH message procedure that contains a group of commands and is stored in the message area of PLC 3 or PLC 3 10 memory Chapter 4 DH and DH Communication You specify the scanner that receives the command with an extended address This address always takes the form E2 3 nn Where Function E2 specifies that this command addresses the module status area of memory 3 specifies that you are sending the message instruction through the scanner nn is replaced with the thumbwheel setting on your particular scanner 1 15 To enter a message instruction do the following 1 Enter a condition that when true activates the message instruction In Figure 4 2 we use an examine on for input word 12 bit 01 2 Enter MSG for t
59. to select operating parameters for the DH DH communication channel These operating parameters are called privileges For example you must have privilege 4 selected in order to enter and edit a ladder program If you want to protect your ladder program from editing you could deselect privilege 4 Another user could still monitor or read your ladder program but could not alter it 2 17 Chapter 2 Contiguring the Scanner through LIST 2 18 Available privileges are Privilege Allows the device on the channel to Number 0 write to the system status area of memory 1 write to the system pointers area of memory 2 write to the module status area of memory 3 write to the data table area of memory 4 write to the ladder program area of memory 5 write to the message area of memory 6 write to the system symbols area of memory 7 write to the system scratchpad area of memory 8 write to the converted procedures area of memory 10 write to the force tables area of memory 64 On line edit or edit the ladder program while the processor is in the run mode 65 Create and delete sections of memory 66 Change privileges list 67 Change the operating mode without having the remote enable section in LIST active 68 Change the operating mode only when the remote enable selection in LIST is active 69 Change system parameters in LIST such as system clock watchdog timer and current context 70 Change module dependent parameters in LIST 71 Test the ladder
60. to the scanner are in the form of a command block The command is always structured as follows Command STX Block Seq Command Command Command Data ETX 02 Count Buffer Size 03 Checksum command buffer Command Description STX start of text the first byte of the control block 02 hex Command block sequence count Command block sequence count 0 to 7F hex Command buffer size Number of bytes to follow in the command buffer The buffer includes all bytes between this buffer size byte and the ETX Command The fourth byte in the command block contains the hex code corresponding to the desired command Command data The command data contains all parameters associated with the indicated command When the command data contains data in word format the lower byte must be sent first Important The master can send multiple commands in one command buffer by including another command and command data after the previous one Each command must have all necessary parameters and the entire command block cannot be larger than the scanner is capable of receiving This maximum size should be one less than is reported in a CCR response One word is reserved for scanner use ETX End of text Following the command buffer is the ETX code 03 hex Checksum The last byte is a checksum which is the sum of all previous bytes from the STX 02 through ETX 03 inclusively A 7 App
61. was not previously defined a new symbol is generated Important You cannot transfer data from another station and place it into a user symbol defined at the local controller 5 12 Chapter 5 Addressing DH and DH Data Transfers Formatting an Assignment Command The equal sign is the assignment command The destination is on the left of the equal sign and the source is on the right When the scanner executes an assignment command it assigns or copies the source value to the destination For example 112 024 US 5 The scanner copies the value of user symbol US 5 into word 24 octal of input file 12 see Using Symbols page 6 4 Available Modifiers You can add several modifiers to the assignment command to change the Scope of the assignment priority level of a DH message type of command message transmitted Scope of the Assignment If the destination for an assignment command is a user symbol then you can use a double equal sign in place of the single equal sign to specify that the user symbol be interprocedural in scope The single equal sign defines a procedural user symbol For example US 2 The scanner defines US 2 to an interprocedural user symbol and assigns it the value 6 see Using Symbols page 6 4 Message Priority DH only If you want to give priority to a DH message you can use the less than sign with the equal sign lt Without the less than sign the assignment co
62. you are using manual switchover and switchover occurs you must wait at least 60 seconds before switching back to the primary system Failure to observe these cautions could result in equipment damage and or unpredictable machine operation For detailed information on installing and operating a backup system refer to the PLC 3 Backup Concepts Manual publication 1775 6 3 1 Chapter 1 Scanner Hardware and Installation Connecting to a DH or DH The scanner enables the connectors labeled DH DH when you set Network communication channel 4 for a DH or DH link You can use the 9 pin connector to connect the programming terminal for programming the processor on a DH network 3 pin connector to connect the controller to a DH or DH netwrok Programming Terminal Connections The 9 pin connector provides direct connection via the Industrial Terminal Processor Cable Cable Communication Board 1784 CP5 1784 KTK1 1784 CP 1784 KT For detailed information on installing and operating the Industrial Terminal cat no 1784 T50 with the controller refer to the Industrial Terminal T53 User s Manual publication 1784 6 5 1 DH DH Connections The 3 pin connector provides direct connection via Twinaxial Cable cat no 1770 CD to a DH or DH link Figure 1 9 For detailed information on installing a DH or DH refer to DH Cable Assembly and Installation Manual publication 1770 6 2 2 1 13 Chapter 1 Scanner Hardwar
63. zero For example the scanner interprets 17 as decimal 17 but 017 as octal 17 Important An exception to the above rule occurs when addressing a word in the input or output sections of PLC 3 memory In these cases the scanner normally interprets the word address wordadar as an octal number regardless of leading zeros To express an input or output word address as a decimal value enclose the word address within parentheses and eliminate leading zeros 5 1 Chapter 5 Addressing DH and DH Data Transfers Addressing Data Specifying Addresses In addressing individual bits parentheses have no effect on the address interpretation The scanner interprets the bit address bit as an octal number if it starts with a leading zero and as a decimal number if it does not start with a zero Some examples are given below Address Interpretation expressed in decimal 112 15 input file 12 word 13 112 15 15 input file 12 word 13 bit 15 112 015 input file 12 word 13 N43 15 integer file 43 word 15 N43 015 integer file 43 word 13 N043 15 integer file 35 word 15 You reference data by its address in memory In a message command you must precede an address with a dollar sign The dollar sign acts as a delimiter to tell the scanner that it has encountered a data address Figure 5 1 Figure 5 1 Example Assignment Command Showing Addressing Format B45 21 112 33 V Destination Source Address Address
64. 0 03 Device STX ISC SIZ CMD DAT ETX CHK 02 27 08 01 data 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 00 03 Device STX ISC SIZ CMD DAT ETX CHK 02 27 08 10 data 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 00 03 Device STX ISC SIZ CMD DAT ETX CHK 02 27 08 20 data 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 00 03 e e e Device STX ISC SIZ CMD DAT ETX CHK 02 27 08 co data 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 00 03 Device STX ISC SIZ CMD DAT ETX CHK 02 27 08 DO data 03 PLC 3 STX OSC SIZ RSP ETX CHK 02 01 00 03 Device STX ISC SIZ CMD ETX CHK 02 01 09 03 Appendix A Binary Command Language Read Section Size Command Hex 19 Parameters Address of section to read Description The following example command block requests the size of the data table in context 1 STX ISC SIZ CMD DAT ETX CHK 02 08 04 19 03 03 01 03 31 The data bytes store address mask 03 hex first and second address bytes 903 01 hex The processor responds to a read section size command with one of the following response codes Response Codes Hex Description 00 Success 04 Address unknown 06 Access not allowed If the processor returns a success response code the next four bytes contain the section size with the least significant byte transmitted fi
65. 02 01 01 00 03 07 The size is specified in one byte This is true of all size specifiers within the data buffer of a response block Read Modify Write Command Hex 16 Parameters Address of the word to modify one word AND mask one word OR mask Description The following example command block executes the read modify write command STX 02 ISC SIZ CMD DAT ETX CHK 0D 08 16 24 05 08 55 55 OF OF 03 07 The data bytes store address mask 24 hex first and second address bytes 05 03 hex lower and upper bytes of AND mask 55 hex lower and upper bytes of OR mask OF hex Appendix A Binary Command Language When the processor receives a read modify write command it Figure A 3 1 Reads the data at the specified address 2 Performs a logical AND operation between the data read in step 1 and the AND mask 3 Performs a logical OR operation between the result of step 2 and the OR mask 4 Writes the result of step 3 into the word at the specified address Figure A 3 Read Modify Write Operation Bit Pattern Description 1111000011110000 Initial state of specified word 0101010101010101 AND mask 0101000001010000 Result of logical AND operation 1010000001011111 Final result The processor responds to a read modify write command with one of the following response codes Response Codes Hex Description 00 Success 04
66. 1 times backup communication 3 10 block transfer 3 2 DH 4 13 DH 4 13 I O scan 3 2 4 13 peer to peer communication 3 10 token passing 4 12 TO BCD function 6 17 6 18 trunkline 4 1 twinaxial cable 1 2 1 14 1 16 U unprotected commands 4 10 4 12 5 14 unsolicited messages 4 4 user symbols 6 5 6 6 using this manual P 1 P 3 audience P 2 contents P 1 related publications P 2 vocabulary P 2 PLC PLC 2 PLC 3 and PLC 3 10 are registered trademarks of Allen Bradley Company Inc PLC 5 and Data Highway Plus are trademarks of Allen Bradley Company Inc ALLEN BRADLEY WU 94 ROCKWELL INTERNATIONAL COMPANY With offices in major cities worldwide WORLD EUROPE MIDDLE HEADQUARTERS EAST AFRICA Allen Bradley HEADQUARTERS 1201 South Second Street Allen Bradley Europe B V Milwaukee WI 53204 USA Amsterdamseweg 15 Tel 1 414 382 2000 1422 AC Uithoorn Telex 43 11 016 The Netherlands FAX 1 414 382 4444 Tel 31 2975 43500 Telex 844 18042 FAX 31 2975 60222 Publication 1775 6 5 5 November 1992 Supersedes 1775 6 5 5 November 1987 As a subsidiary of Rockwell International one of the world s largest technology companies Allen Bradley meets today s challenges of industrial automation with over 85 years of practical plant floor experience More than 11 000 employees throughout the world design manufacture and apply a wide range of control and automation products and supporting
67. 1 if the comparison is true and 0 zero if the comparison is false For example 112 24 CACC 1 GE CACC 2 Then the scanner stores this value in input file 12 word 24 If the accumulated value of counter 1 is greater than or equal to the accumulated value of counter 2 less than the accumulated value of counter 2 Message Procedure Commands Command assignment CREATE DELETE execute EXIT GOTO ON_ERROR STOP Chapter 6 Programming DH and DH Message Procedures The scanner has its own command language that you can use in programming message procedures Table 6 D summarizes these commands Table 6 D Message Procedure Commands Format and Explanation See page destination source Assign a numeric value to a user symbol or copy data from the source to the destination see chapter 5 C system symbol logical address 6 14 Create a symbolic address and equate it to a logical address D system symbol 6 14 Delete a symbolic address or an entire message procedure from memory system symbol 6 15 Execute the named message procedure E 6 15 Terminate execution of the current message procedure G label 6 15 Continue executing the current procedure from the point specified by the label expression embedded command 6 16 Execute the embedded command only if the specified expression is true O embedded command 6 16 Execute the embedded command only if an error occurs afte
68. 11 DH Active Node List Select the DH Active Node List option from the configuration screen to display a list of active nodes on the local link for channel four an x next to a station number indicates a remote station on the link aus next to a station number indicates the station number of the scanner whose list configuration you are currently viewing LIST OF ACTIVE STATIONS ON THE LOCAL DH LINK TOTAL NUMBER OF STATIONS ON LOCAL LINK 7 0 X 10 20 30 40 50 60 70 1 X 11 21 31 41 51 61 71 2 X 12 22 32 42 52 62 72 3 X 13 23 33 43 59 63 73 4 X 14 24 34 44 54 64 74 5 X 15 25 39 45 55 65 75 6 US 16 26 36 46 56 66 76 7 17 27 37 47 57 67 33 1 EXIT THIS MENU 2 REDISPLAY MENU 2 19 Chapter 2 Contiguring the Scanner through LIST Setting the Rack Range Configuring the Front Panel 2 20 12 DH Active Nodes to Status File 6 Select the DH Active Nodes to Status File 6 option from the configuration screen to maintain the DH active node table in status file 6 The list of active nodes is stored in status file 6 If you enable this option you must also create status file 6 Status file 6 is partitioned into 4 words for each of the 15 possible scanner thumbwheels To provide for 15 scanners you must create 6 59 Each of the 64 bits contained in the 4 word groups represent the possible DH station numbers of 0 through 77 octal If the bit is a Then the station represented by that bit
69. 17 6 18 front panel LIST selections 2 20 2 22 functions for message procedures 6 17 6 18 G GOTO command 6 13 6 15 I T defaults LIST selection 2 21 I O communication 3 1 I O rack in I O chassis scanning sequence 2 6 range 2 20 I O scan configuration LIST selection 2 6 effect on program execution 3 1 sequence list 2 6 timing considerations 3 1 3 3 IF command 6 13 6 16 indicators DH 1 3 1 5 DH 1 3 1 5 fail 1 3 1 4 forces enabled 1 4 I O channel status 1 3 1 4 pass 1 3 1 4 input file for backup communication channel 2 9 3 8 peer to peer communication channel 2 8 3 4 input file list LIST selection 2 16 2 22 K keyswitch position 2 15 L ladder program 4 6 link 4 1 4 12 4 14 5 11 LIST function 2 1 LIST selections for scanner 2 2 local error codes B 1 B 3 logical ASCII addressing 5 8 logical operators 6 9 master number 2 8 message commands 4 9 comments 6 19 errors _7 2 7 5 B 1 expressions 6 7 for data transfers 4 8 functions 6 17 MSG instruction operation _4 6 4 7 procedure 4 7 6 21 solicited and unsolicited 4 4 4 5 symbols 6 4 6 6 Message Procedures DH 6 1 6 4 DH 6 1 modifiers 5 13 Index 1 3 node identification in LIST 2 17 mode LIST selection 2 11 0 ON ERROR command 6 13 6 16 operating mode LIST selection 2 4 output file for backup communication channel 2 9 3 8
70. 3 system S5 scanner e 2 scanners in a PLC 3 10 system SR5 scanner Backup connector Transfers control to a backup PLC 3 or PLC 3 10 system if a fault shuts down the primary system Makes connections to e 1771 I O chassis up to 10 000 cable feet away from the scanner via twinaxial cable cat no 1770 CD for I O communication Communication channels on scanners in up to six separate PLC 3 or PLC 3 10 systems via twinaxial cable for peer to peer communication e Communication channel on a scanner in a backup PLC 3 or PLC 3 10 system via twinaxial cable for backup communication Terminal arm Message procedure commands Easy to use commands that you can use to transfer data over a DH or DH link and combine in procedures for e complex logic decisions looping and nesting e symbolic representation of data and addresses e embedded arithmetic expressions and logic operations e error checking and reporting e decimal octal or binary coded decimal data entry e functions for converting data values to and from BCD 1 2 Hardware Features Chapter 1 Scanner Hardware and Installation Figure 1 1 shows the hardware components on your scanner Figure 1 1 Hardware Features on the Scanner 1775 85 Scanner 1775 SR5 Scanner m AH m PASS and FAIL indicators j Thumbwheel swit
71. 5 SR5 scanner communication channel in LIST Failure to observe this caution could result in equipment damage and or undesired machine operation Reconfiguration The reconfiguration selection sets configuration parameters for the scanner The reconfigure selection implements changes that you have made in LIST for the communication channel For example suppose you list an I O chassis 3 times in the I O chassis scanning sequence list and you change the list to include that chassis 6 times The scanner does not change its polling sequence until you select reconfigure for the I O channel Important When selecting reconfigure the scanner executes a reconfiguration of the selected channel only Also when you power up the PLC 3 controller a reconfiguration automatically executes If an asterisk is next to the reconfiguration selection changes have been requested but not implemented Upon selecting reconfigure the scanner implements the changes and removes the asterisk Chapter 2 Contiguring the Scanner through LIST in the run mode and executing block transfers could cause a bad ATTENTION Selecting reconfiguration while the controller is address fault If this situation occurs you should Clear the bad address fault in a fault routine Clear the block transfer error bit Restart the block transfer in the ladder program 1 0 Scan Configuration When you configure an I O channel for I O scan you can change the o
72. ALLEN BRADLEY Wy PLC 3 Family I O Scanner Communication Adapter Module User Manual M Important User Information Because of the variety of uses for this product and because of the differences between solid state products and electromechanical products those responsible for applying and using this product must satisfy themselves as to the acceptability of each application and use of this product For more information refer to publication SGI 1 1 Safety Guidelines For The Application Installation and Maintenance of Solid State Control The illustrations charts and layout examples shown in this manual are intended solely to illustrate the text of this manual Because of the many variables and requirements associated with any particular installation Allen Bradley Company cannot assume responsibility or liability for actual use based upon the illustrative uses and applications No patent liability is assumed by Allen Bradley Company with respect to use of information circuits equipment or software described in this text Reproduction of the contents of this manual in whole or in part without written permission of the Allen Bradley Company is prohibited Throughout this manual we make notes to alert you to possible injury to people or damage to equipment under specific circumstances ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic l
73. C SIZ CMD DAT ETX CHK 02 07 o 2 00 00 o 10 00 03 pic 3 STX OSC SIZ RSP DAT ETX CHK 02 22 00 10 data 03 e e e Device STX ISC SIZ CMD DAT ETX CHK 02 0 0 CO 0 00 Of 10 00 03 pic 3 STX OSC SIZ RSP 0D DAT ETX CHK 02 22 00 48 data 03 Device STX ISC SIZ CMD DAT ETX CHK 02 07 07 DO 04 00 o oD 00 03 pic 3 STX OSC SIZ RSP DAT ETX CHK 02 24 00 10 data 03 Write Block Physical Hex 08 Parameters Physical address of the first location in processor memory to receive data number of words in the block of data data to write into processor memory A 28 Appendix A Binary Command Language Description The processor only recognizes the write block physical command when in the shutdown mode To put the processor into the shutdown mode use the shutdown command 06 hex The following example command block uses the shutdown command STX ISC SIZ CMD ETX CHK 02 04 01 06 03 10 The response to a shutdown command is a success response code 00 hex Any other response indicates that the processor did not correctly receive the transmission The following example command block uses the write block physical command STX 02 ISC 05 SIZ 0B CMD 08 DAT ETX CHK 01 20 00 01 02 00 19 05 20 0 03 80 The data bytes store
74. E 81 AND ERROR LE 92 GOTO NO_STN no station fatal error IF A GE 252 GOTO TIMEOUT after ten errors tell operator A A 28 update error pointer EXIT O STN S4 3 5 1 energize 1775 GA report generation message rung STOP exit procedure with an error TIMEOUT 84 3 4 1 energize 1775 GA report generation message rung A clear error pointer EXIT return to REM_TURNON 6 20 Chapter 6 Programming DH and DH Message Procedures The 300 second timer in the example procedure given in Figure 6 7 is not an accurate real time clock This is because the time between successive executions of the bit timer check depends on activity on the DH or DH and on the activity of the local PLC 3 controller For example if the 300 second timer times out immediately after its done bit is checked the scanner does not detect this condition until its next pass through LOOP2 If the link is busy with other activity it takes a while for LOOP 2 to check the remote bit The example procedure also assumes that the referenced memory areas have been created Specifically 1 Status file S9 must be big enough to hold ten errors of 28 words each 2 Timer T1 is a one second timebase timer Bit B0 0 0 controls the ladder rung that activates the timer Figure 6 7 refers to this bit as TIM START T ON BIT 3 Bit S4 3 4 and S4 3 5 activate message instruction
75. FROM ATO R A WCACC 0001 25 R W0001 0007 0000000000011001 MOV MOVE FROM ATO R A WI001 0007 000000000001 1001 R WCACC 0001 25 3 9 Chapter 3 I O ommunication Calculating Peer to Peer and Backup Communication Times The time required to transfer a file across a peer to peer or backup communication link depends on the number of active channels on the scanner communication rate words in the output files To calculate the time needed to update every input file on the link use the following procedure 1 Determine the number of words in all output files of the master and each slave on the peer to peer communication link Add them divide by 16 and round up to the nearest whole number Important Remember that the master has an output file for each slave 2 Determine the greatest number of active channels on any scanner on the peer to peer communication channel 3 Find the nominal peer to peer time by using Table 3 C and the result of step 2 Table 3 C Peer to Peer and Backup Communication Times per Slave in Milliseconds Number of Active I O Channels bps Chan 4 Config 1 3 4 57 6k Not DH DH 12 12 5 13 DH DH 12 5 14 N A 115 2k Not DH DH 8 9 10 5 DH DH 9 11 N A 230 4k Not DH DH 6 5 8 9 DH DH N A N A N A 4 Multiply the result of step 3 by the result of step 1 Update Time Nominal time x total words 16 Chapter 3 I O Communication To calculate the time needed to
76. Failure The function failed for a reason which cannot be described by any other response code Initializing Communications To initiate communications with the scanner the master sends a break character followed by a CCR The CCR should have the reset communications bit bit 0 of the control code set This instructs the scanner to return to its initial communications state including resetting the command block sequence and the response block sequence count The master must see break go away before sending the CCR The scanner sends break for a character timeout period The scanner identifies a break character as any high state voltage which remains on the line longer than the time required to transmit one character byte The approximate character times are listed in Table A D A 9 Appendix A Binary Command Language Table A D Approximate Character Times Communication Rate in bits s Approximate character transmit time 10 bit character 8 bit character 110 150 66 7 ms 53 3 ms 1800 4 4 ms 2400 3 3 ms 4800 1 7 ms 9600 0 83 ms 19200 0 41 ms The break character tells the scanner to terminate any previous communication Therefore send a break character whenever you initiate or terminate communication Both the scanner and the master device respond to a break at any time by stopping transmission even in the middle of a block Although not configurable on the scanner some PLC 3 family modules which use BCL
77. Figure 4 3 the assignment command copies a word 16 bits of data from the source to the destination location The source of the data is always specified on the right of the equal sign and the destination is always on the left An assignment command does not destroy the data at the source location it copies the source data at the destination location When the assignment executes both the source and destination contain the same data You can use a data transfer command with the scanner asasingle command within a message instruction as one of multiple commands within a message procedure Figure 4 4 illustrates both of these methods for the same assignment command A message instruction in the ladder program controls execution of the command in either case 1 as a single command in a PLC 3 message instruction Chapter 4 DH and DH Communication Figure 4 4 Two Ways to Use Message Commands 2 as part of a message procedure Message Frocedure FROU_A STAT Message Procedure PROC_A MSG EN 12 other commands 10012 MESSAGE TYPE 1 STAT L _ CTL FB200 0000 200 L DN 4 B45 21 112 33 01 CHANNEL E2 3 1 15 B45 21 112 33 STAT other commands Ep ER 13 PLC 3 Message Instruction to Control Execution of Procedure PROC_A STAT MSG ai 12 10012 MESSAGE TYPE 1 STAT L 4 CTL BW2000000 200 pNj j i CHANNEL E2 3 1 T PROC A STAT ER 13
78. H DH Status Indicators for 1775 S5 SR5 Scanner Modules Indicator Status Description XMTG transmitting a message RCVG receiving a message RDY ready to transmit a message ERR programming or communication error detected DIS DH DH channel is disabled DH DH Diagnostic Assignment Command Chapter 7 Diagnostics Methods Important When the scanner is polling both the XMTG and RCVG LEDs trun on Also if there is a duplicate node on DH the yellow disable indicator blinks until the condition is removed The scanner can send out DH and DH diagnostic commands using a special format of the assignment command As with other assignment commands you can program this command directly into the message instruction or use it within a DH DH procedure properly programmed unanticipated data can be sent to remote stations on the DH or DH link causing unpredictable operation ATTENTION If the diagnostic assignment command is not This assignment command requires that data table be reserved for both the command to be sent and the response that will be returned from the remote station You must reserve a minimum of 126 words of data table for the response The command is formatted as follows note the special use of the exclamation point B0 0 H023 B1 0 command block location destination response block location Where Is the response block starting address of the data table address which will be
79. H DH Switch Settings 11 DH Active Node List gt Privileges 12 DH Active Nodes To Status File 6 0 Enter Next 3 4 5 6 8 See page 2 19 amp 2 20 10 64 65 66 68 69 70 71 72 74 Enter Next gt Configuring the Communication Channels Chapter 2 Configuring the Scanner through LIST To configure channels 1 through 4 you select the following parameters communication rate bps page 2 3 operating mode page 2 4 auto configuration page 2 4 reconfiguration page 2 5 T O scan configuration page 2 6 peer to peer master configuration page 2 8 peer to peer slave configuration page 2 8 backup communication configuration page 2 9 DH or DH configuration channel 4 only page 2 10 Communication Rate You can select one of the following communication rates for the corresponding communication channel If you select Then the maximum I O channel cable length can be 57 6 kbps 10 000 feet 115 2 kbps 5 000 feet 230 4 kbps 2 000 feet Important If you are configuring channel 4 note the following You must set the protocol switches for LIST configurable for the scanner to modify this selection For DH communication the scanner communicates at 57 6 kbps only For DH communication the scanner communicates at 57 6 kbps or 115 2 kbps Not all DH stations are capable of operating above 57 6 kbps You must reference the appropriate users manual for the maximum c
80. HO40 PUNCH A1 0 HO14 T0 5 T4 6 HO14 C5 c4 5 Description write two words beginning with decimal file 1 word 0 into remote station 24 s decimal file 1 word 0 write the data stored at ascii file 1 word 0 into remote station 40 which will store the data at the address defined by symbolic address PUNCH This symbol must be created and defined in the remote station write 6 contiguous words beginning with TCTL 4 into remote station 14 beginning with timer five In this example timers 4 and 5 3 words each would be transferred complete write 5 contiguous words beginning with CCTL 4 into remote station 14 beginning with counter 5 In this example CCTL 4 CPRE 4 CACC 4 CCTL 5 and CPRE 5 would be transferred into CCTL 5 CPRE 5 CACC 5 CCTL 6 and CPRE 6 respectively 5 17 Chapter Objectives Message Instruction Considerations Chapter Programming DH and DH Message Procedures This chapter explains how to create edit and use the message instruction to operate the DH and DH communication channel on the scanner This chapter helps you learn how to enter a message instruction into the ladder program program message command functions and procedures add comments to a message procedure program message procedures to monitor and recover from errors that occur during message command execution You do not always have to create a message procedure If
81. O Rack 1 0 group 0 OFPMO DPMS DFLNO ORANO To find the word that stores the fault bits for an I O adapter Rack in decimal word in file 2 containing fault bits for the adapter 4 The remainder tells you the bit numbers within the word 0 bits 00 to 03 1 bits 04 to 07 2 bits 10to 13 3 bits 14 to 17 For example the fault bits for I O rack 10 are in word 2 82 2 bits 10 to 13 15180 Important The processor does not create status file 2 at power up You must create it in memory by using the create command Chapter 7 Diagnostics Methods I O Communication Retry A communication retry is a re transmission of data that occurs when the Counts Status File 3 original transmission is unsuccessful If the I O adapter does not respond or sends invalid data when the scanner communicates to the I O adapter the scanner executes a retry You can track the retry count by monitoring status file 3 see Figure 7 5 Figure 7 5 1 0 Communication Retry Counts Status File 3 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Starting word 0 Adapter group word 1 0 word 2 word 3 word 4 Ono ORANO word 5 word 6 word 7 word n
82. OF No privilege If any code other than success is returned no data is written into memory The following response block shows a successful write word command STX OSC SIZ RSP ETX CHK 02 01 01 00 03 07 Write Block Command Hex 20 Parameters Starting address number of words and the new data Description The following example command block writes new data into the first 3 words of integer file 0 STX ISC SIZ CMD DAT ETX CHK 02 01 0E 20 3C 05 00 00 00 03 00 10 02 08 00 7D 8E 03 9D The data bytes store address mask 3C hex first to fourth address bytes 05 00 00 00 hex lower and upper bytes of size word 03 00 hex first data word 10 02 hex second data word 08 00 hex third data word 7D 8E hex Appendix A Binary Command Language The processor responds to a write block command with one of the following response codes Response Codes Hex Description 00 Success 04 Address unknown 05 Size too big 06 Access not allowed 08 Address not complete OF No privilege If the size too big response returns the processor stores data which fits into the existing memory locations The rest is lost If any code besides success or size too big is returned no data is written into memory The following response block shows a successful write block command STX OSC SIZ RSP ETX CHK
83. Operations Manual publication 1775 6 7 1 and PLC 3 Programmable Controller Backup Systems Manual Publication 1775 6 3 1 Programming Backup Communication Backup communication channels operate in the same manner as peer to peer communication channels with these considerations In using a backup communication channel you can send information back and forth between the primary and backup systems Since information moves both ways you can monitor the run backup bit data table status section file 0 word 3 bit 17 to determine whether to use the received data The input file in the backup system must be equal to or larger than the output file in the primary system Otherwise a backup communication minor fault occurs 3 8 Chapter 3 I O Communication Figure 3 7 shows example rungs using the run backup bit S000 3 17 To use these rungs for backup communication you must enter them into the primary and backup systems The run backup bit is set in the primary system and reset in the backup system The counter is updated only in the backup system In this example both the primary and backup systems use input file 1 as the input file and output file 1 as the output file for the backup communication channel For detailed information on the backup feature refer to the PLC 3 Family Controller Backup Concepts Manual publication 1775 6 3 1 Figure 3 7 Example Rungs for a Backup Communication Channel MOV MOVE
84. ages Figure 4 2 illustrates how these two programming levels processor and scanner interrelate Figure 4 2 Levels of Programming in DH or DH Communication 1 PLC 3 Processor 2 1775 S5 Module Ladder Diagram Program Data Highway Message Procedure PROC_A STAT MSG EN 12 VE MESSAGE TYPE 1 STAT TL FB200 0000 200 i CHANNEL E23 1 n H024 B12 37 15 PROC_A STAT ER 13 Message procedure command to transmit a message to data highway station number 24 Message instruction to execute message procedure PROC A 3 Data Highway DATA DST SRC CMD STS TNSW ADDR SIZE OPTIONAL ge Command message transmitted to station 24 4 5 Chapter 4 DH and DH Communication 4 6 Ladder Program The first link in the communication process is your ladder program You send a DH DH command message by means of the message MSG instruction Figure 4 2 When the rung becomes true the processor informs the scanner to begin sending command s across the link At the same time bits in a control file word change their state Table 4 B to reflect the status of the message instruction Important Once enabled even if the rung becomes false the scanner continues to send commands across the DH DH network until the message is done or errors Table 4 B The Status of Bits in a Control File Word When the The processor message instruction is true sets
85. ajor read and write system fault 91 e Handshaking lines on the RS 232 C link are not connected properly e Multiple wacks on link 92 The remote station specified does not acknowledge ACK the message 94 Remote station is disabled 112 Undefined operator in an assignment statement or expression 114 Illegal expression syntax 115 Illegal unary prefix operator in an expression 117 Undefined data following a valid address in a CREATE command or undefined data following a valid symbol in a delete command 121 Symbol undefined because it appears as the source in an assignment command before it is defined For example a statement of the form A A 6 generates this error if user symbol A has not appeared previously 123 System symbol must be a symbolic address This error occurs if a procedure name is used in place of a symbolic address in an assignment statement or if the system symbol referenced in an assignment does not exist B 4 Apendix B DH DH Error Codes Error Code Error Type Associated Commands Meaning Illegal destination in an assignment command or invalid data following a number on a command line For example the lines 5 4 1 or GASDFGHJ generate this error code The line rbWERTYUI generates error code 140 unrecognized command Illegal modifier for the CREATE command Accepted modifiers for the create command are LOCAL and GLOBAL The CREATE command was specified bu
86. anner The response data contains the diagnostic counters The scanner DH counters are defined in Table 7 F and DH counters in Table 7 G Command block in data table 0008 0006 0000 0001 5E00 1200 Response block in data table 0000 0016 4600 1700 7E4B 7F4B 0000 0000 0000 0000 0000 0000 0000 7 13 Chapter 7 Diagnostics Methods 7 14 Diagnostic Counters Reset Command Use this command to reset to zero all the diagnostic counters in the remote station Command block in data table 0005 0006 0000 0007 Response block in data table 0000 0004 4600 1900 Table 7 F DH Diagnostic Counters Byte This counter increments when the scanner 1 receives an ACK with a bad CRC 2 does not receive an ACK before the timeout value 3 while master detects a message transmission by another station contention 4 receives an error in the received ACK 5 adds errors in bytes 1 2 and 4 6 receives a WAK when no receive buffer space is available at the remote station 7 does not detect a master on the link before its timeout period expires and so assumes mastership 8 as master does not receive a reply from its polling sequence that has been narrowed done to a single station 9 receives an ACK even though it does not have mastership 10 receives an illegal packet of less than 6 bytes 11 receives a packet with an incorrect destination or a packet in which the source is equal to the destination 12 not used 13 receives a
87. ata type address you enclose the address parameters in double quotes Format Example address size N55 0 20 Figure 5 6 Example of Logical ASCII Address that Accesses the First Word in File 1 1 0 A _ Logical ASCII data type delimiter Word address in memory Logical ASCII data type delimiter Address delimiter Symbols are allowed inside the double quotes if they are defined in the remote station Chapter 5 Addressing DH and DH Data Transfers Logical ASCII data type addressing treats data being received and sent from the floating point data table section as a special case The PLC 3 stores floating point data using DEC F format and the PLC 5 family store the same data using IEEE format To handle this whenever you send floating point data using logical ASCII data type addressing the scanner translates the data into IEEE format before transmitting on the link Likewise if floating point data is received using logical ASCII data type addressing the scanner translates the data from IEEE format into DEC F format before storing into memory Word Range A logical ASCII word range DH DH packet does not indicate to the receiving station anything about the data structure The user assumes responsibility for possibly sending unlike data types to the remote station For example integer data to a BCD file The sending station simply sends the data from the data table address given and the
88. ber of consecutive retries that execute before the processor declares an I O fault 1 10 2 o Moo S o oo 3107 6 810 16 4 If the processor declares an I O fault it sets the following bits I O adapter fault status bit file 2 that corresponds to the I O adapter major or minor I O fault bit in system status The scanner continues scanning the I O chassis When it returns to the faulted I O adapter it attempts to reset the input or output and moves on to the next I O adapter Important Upon declaring a major or minor I O fault if normal communication returns to the I O adapter the processor does not reset the I O adapter fault bit in status file 2 or the major I O or minor I O fault bit in system status If you do not want normal communication to return to a faulted I O adapter set the processor reset lockout switch on the I O chassis With this switch set the I O adapter does not reply to the scanner once a fault is declared until you cycle power at the I O chassis or press the reset button on the I O adapter If you configure an I O channel for peer to peer or backup communication and communication problems occur between two scanners master slave primary or backup on the channel a retry executes If the communication occurs properly normal operation continues If communication problem continues to occur the scanners set the peer to peer or backup communication minor fault status bit in system status
89. c status Backplane error occurred during determination of the physical address of the end of the ladder program or of the end of user memory In polled mode the RS 232 C port has received a NAK which causes a system reset PLC PLC 2 read Local PLC 3 backplane error either memory parity or timeout disconnect In write polled mode the RS 232 C port has received a NAK which causes a system shutdown PLC 3 read and Backplane error memory parity or timeout disconnect In polled mode the write RS 232 C port has received a NAK which causes a system reset 85 diagnostic read The command is an illegal request to read from the scanner s backplane window PLC PLC 2 read e PLC 3 file does not exist e PLC 3 file is too small e PLC 3 file is more than 65 535 words long PLC PLC 2 bit write e PLC 3 file does not exist Destination bits do not exist in PLC 3 file Length of PLC 3 file is greater than 65 535 words PLC PLC 2 word Destination file does not exist in PLC 3 memory write Destination word does not exist in the destination PLC 3 file e Length of the destination file is greater than 65 535 words 86 PLC PLC 2 bit write Keyswitch setting at local PLC 3 controller prohibits access PLC PLC 2 word Local keyswitch settings prohibit writing into desired destination file write PLC 3 write Keyswitch setting disallows access to file 87 PLC PLC 2 PLC 3 The local PLC 3 controller is in program mode There may or may not be a m
90. can also be configured for BREAK DISABLED This option is selected when the master is not capable of detecting a break sent from the PLC 3 When the channel is configured with BREAK DISABLED the master must send break for a minimum of one second If the master device does not support a break character you can initiate communications by sending a valid command to the scanner Important If you use this method remember that the PLC 3 scanner may not be in its initial communication state when you begin communicating with it This can cause the PLC 3 to respond with invalid results until a timeout or other error causes it to terminate communication return to its initial state and start over Appendix A Binary Command Language Communication The scanner must supply an ACK or NAK within one character timeout period of receiving a command block As the slave on the link the scanner has until a response timeout occurs before issuing a response block If the scanner receives a command block correctly it responds with an ACK code 06 hex and increments the command block sequence count The master also increments the command block sequence count and resets the error count at this time If the scanner detects an error in the command block which it receives it responds with a NAK code 15 hex Some typical reasons for sending a NAK are as follows received invalid command block sequence count unexpected command block unable
91. cece eee e eee P 1 Audience usse ie eR RR dl Be E E edP a P 2 Vocabulary sssseseseese een e eens P 2 Scanner Hardware and Installation 1 1 Chapter Objectives n on nnana 1 1 Scanner Features and Functions nannaa aana 1 1 Hardware Features cscs eve cede edax 1 3 Configuring the Scanner Hardware lusus 1 6 Connecting to a Backup System 0 0 cee eeee 1 12 Connecting to a DH or DH Network 000005 1 13 Connecting to the I O Channel Terminal Arm 1 16 Configuring the Scanner through LIST 2 1 Chapter Objectives 0 00 c eee eee eee eee 2 1 Accessing the LIST Function 0 0 00 c eee eeeee 2 1 Configuring the Communication Channels 2 3 Setting the Rack Range 0 0 ccc cece eee eee 2 20 Configuring the Front Panel 00 cc eee ee eens 2 20 VO Communication L lesse 3 1 Chapter Objectives 0 0 0 cece eee eee e eee eee 31 Effect of I O Scan on Program Execution 3 1 Peer to Peer and Backup Communication 3 3 DH and DH Communication 4 1 Chapter Objectives 221 oes eoe re ER IRR 41 INrOd CHON uinea eee eS a oe eho ie ee So ela d s d 4 1 Communication Terms aaas saaana 4 4 Solicited and Unsolicited Messages 4 4 Levels of Programming 0 0
92. ch A _ gt Forces enabled indicator Y lt O channel status indicators LIC 0000 CJ oo DH DH status indicators 4 E OOOOO COCO O Backup connector DH DH connectors BEG AGE Oooo Oooo lt I O channel terminal arm gt gt Oloo fes o T I I The scanner also has switch settings located on the top and bottom edges 15274 1 3 Chapter 1 Scanner Hardware and Installation Pass and Fail Indicators The indicators labeled PASS and FAIL Figure 1 2 keep you informed about the general condition of the scanner PASS green FAIL red Meaning on off normal operation off on module fault on on power up or system reset off off system is not on or module has lost power Forces Enabled Indicator The yellow indicator labeled FORCE Figure 1 2 illuminates when I O forcing is enabled in the system I O Channel Status Indicators The four green indicators labeled CH1 CH2 CH3 and CH4 Figure 1 2 correspond to one of the four I O channels Indicator Description CHx Communication between sca
93. d 01 Diagnostic Counters Reset 07 Chapter 7 Diagnostics Methods Diagnostic Loop Command You can use this command to check the integrity of transmissions over the communication link The command message transmits up to 243 bytes of data to a remote station The receiving station should reply to this command by transmitting the same data back to the scanner For example Command block in data table 0012 0006 0000 0000 0102 0304 0506 0708 090A OBOC OD0O Response block in data table 0000 0011 4600 0200 0102 0304 0506 0708 090A OBOC ODDO Diagnostic Status Command You can use this command to read a block of status information from the remote station The reply to this command contains the diagnostic status information in the response data Each remote station defines the data sent back in response The scanner sends back 18 bytes as defined in Table 7 H For example Command block in data table 0005 0006 0000 0003 Response block in data table 0000 0016 4600 0300 0246 1003 5088 5E00 4002 0000 111B 0400 0000 Diagnostic Read Command You can use this command to read the remote stations diagnostic counters Use the diagnostic status command to obtain the starting address of the diagnostic counters The first two bytes of the command data is the address of the counters low byte high byte as returned from a diagnostic status command The third byte is the number of bytes to be returned 18 bytes for the sc
94. d command to request the data and force information for the output word representing rack 6 module group 4 STX ISC SIZ CMD DAT ETX CHK 02 01 03 23 34 00 03 60 The data bytes store lower byte of the I O address 34 hex upper byte of the I O address 00 hex The processor responds to a read I O word command with one of the following response codes Response Codes Hex Description 00 Success 03 Forces unavailable 04 Address unknown 06 Access not allowed 08 Address not complete When the processor returns a success response the data buffer also contains the data stored at the requested address and force on and force off masks associated with that data The following example shows a response block for a read I O word command when forces exist STX OSC SIZ RSP DAT ETX CHK 02 01 07 00 61 1C 02 86 80 00 03 92 The data bytes store 1 lower byte of the data word 61 hex upper byte of the data word 1C hex lower byte of the force on mask 02 hex upper byte of the force on mask 86 hex lower byte of the force off mask 80 hex upper byte of the force off mask 00 hex Appendix A Binary Command Language If no force table has been created in processor memory the processor responds to a read I O word command with a forces unavailable response code The data stored at the specified address follows this response c
95. de 00 01 02 03 04 05 06 07 08 09 0A oD 0E OF FF Appendix A Binary Command Language Table A C Response Code Response Description Success Operation was completed as requested Size Too Big Operation stopped because the response was too big to fit in the response block Success or failure depends on the operation Available Interpretation of this response depends on the operation See the appropriate command descriptions for details Unavailable Interpretation of this response depends on the operation See the appropriate command descriptions for details Address Does Not Exist The specified address has not been allocated Address Invalid This response is returned when the specified start address is valid but another address used in the operation has not been allocated Access Not Allowed The channel does not have access to the area specified for the purpose requested Allocated The function or resource requested is allocated and therefore unavailable unless it is already allocated to your channel Address Not Complete The address given is not specified to a low enough level to perform the requested function Unknown Command The scanner does not recognize the command code Invalid Parameter A parameter in the command block is invalid Processor Error Processor Error No Privilege One or more privileges required for the attempted operation are not assigned to the channel Unknown
96. e and Installation Figure 1 9 Example of DH and DH Configurations Data Highway DH Link PLC 5 i Family Controller cm VA 8 9 m Computer 1775 85 O d 1785 KA Scanner Module n 7 Se B t I pnr AN BEI Controller j 4 j 1770 KF2 d h i KF2 Series B 200000 i Module DH 1770 KF2 l d Ent KF2 Series B ay Yay ay UT fh Module i M ER Acad ELITR PLc a 10 ig ES Advisor 2 AA z Controller 4 Color Controller dg i e OF Graphic EL System i 1775 KA 1775 SR5 Module Scanner Data Highway Plus DH
97. each are being transferred read the year from the system clock of remote station 45 and store the data in decimal file 0 word 0 Writes to non data table addresses are not allowed write two words beginning with timer four to remote station 14 timer 5 In this example the data in TCTL 4 and TPRE 4 is written to TCTL 5 and TPRE 5 respectively in the remote station write integer file 4 word 1 into remote station 46 s integer file 0 word 0 the entire integer file 0 is written into integer file 1 of remote station 55 The file sizes must be identical high order integers are treated as 32 bits or 2 words This example writes 6 complete high order integers to remote station 2 Description read 100 words from remote station 3 beginning with integer file 55 word 0 and store the data in integer file 0 beginning with word 10 read integer file 0 word 0 from remote station 55 and store data in decimal file 0 word 0 write a decimal value of 15 into binary file 10 word 10 of remote station 20 write the contents of four complete timers three words each beginning with timer 4 into remote station 14 beginning with timer 5 write the contents of 6 complete floating point numbers two words each into remote station 2 beginning with floating point number 0 Table 5 E Chapter 5 Addressing DH and DH Data Transfers Logical ASCII Word Range Addressing Word Range Addressing HO24 D1 0 D1 0 2
98. ections 1 13 1 16 data transfers 4 8 4 12 5 1 5 14 eror B 1 features 1 1 1 2 LIST selections 2 2 2 10 2 20 message instruction 6 1 considerations 6 1 message procedure examples 6 19 6 20 Message Procedures 6 1 6 4 messages 4 6 4 7 programming 4 5 status indicators 1 2 1 5 Switch settings 1 6 timing 4 13 versus DH 4 12 DH error codes _B 1 local B 1 reply B 1 DH command set listings C 1 configuration _4 3 connections _1 13 1 16 data transfers 4 8 4 12 5 1 5 14 error B 1 features 1 1 1 2 LIST selections 2 10 2 20 message procedure examples 6 19 Message Procedures 6 1 6 4 messages 4 7 programming 4 5 status indicators 1 2 Switch settings 1 9 1 10 timing 4 13 versus DH 4 12 DH error codes B 1 local B 1 reply B 1 DH DH configuration 2 10 DH DH timeouts 2 12 2 19 duplicate I O 2 7 E editing message instruction 6 2 error codes for DH B 1 codes for DH B 1 monitoring for DH DH 7 2 7 5 ON ERROR command 6 16 7 1 user symbol 6 19 error block operation 7 3 error codes local B 1 B 3 remote B 2 reply B 1 B 3 error reporting 7 1 execute command 6 13 6 15 EXIT command 6 13 6 1 expression operators 6 7 expressions 1 2 6 7 interpreting 6 8 extended addressing A 14 A 1 F field parameters 5 1 abbreviations 5 1 floating master 4 12 FROM BCD function 6
99. edure The first parameter of the IF command is an expression see Using Expressions page 6 7 You must enclose the entire expression in parentheses Use multiple operators for complex or nested expressions The second element in the IF command is an embedded command If the value of the expression is true 1 the embedded command executes If the value of the expression is false 0 the embedded command does not execute The embedded command can be any available command except another IF or an ON ERROR command Figure 6 3 shows the combination of a label a GOTO command and an IF command to construct a simple loop that assigns the integers 0 through 7 to successive words in binary file 50 Figure 6 3 Example of Looping other commands NUM 0 LOOP B50 NUM NUM NUM NUM 1 IF NUM LE 7 GOTO LOOP other commands ON ERROR Command The ON_ERROR command specifies what action should be taken if an T error occurs during execution of the message procedure The ON_ERROR command does not execute sequentially in the procedure it executes only when an error occurs The ON_ERROR command contains an embedded command and applies to all other commands between itself and the next ON_ERROR command For example command line 1 command line 2 ON_ERROR GOTO RECOVER command line 3 command line 4 ON_ERROR ERR_CODE B2 16 command line 5 In these command lines the first ON_ERROR command applies to command li
100. endix A Binary Command Language Response Block With the exception of the CCR response all responses from the scanner to the master are in the form of a response block The response is always structured as follows Response Response STX Block Seq Data Buffer Response Response Data ETX 02 Count Size Code 03 Checksum lt response buffer gt Command Description STX start of text Response block sequence count the first byte of the control block 02 hex Response block sequence count 0 to 7F hex Response buffer size Number of bytes to follow in the response buffer The buffer includes all bytes between this buffer size byte and the ETX This byte contains the scanner s reaction to the previous master s command in the form of a response code Table A C outlines the response code possibilities Response code Response data The response data includes response parameters associated with the previous command as received from the master When the response data contains data in word format the lower byte is sent first Important The scanner can send multiple responses in one response buffer provided that each response has all necessary parameters ETX End of text Following the response data buffer is the ETX code 03 hex The last byte is a checksum which adds from the STX 02 through ETX 03 inclusively Checksum A 8 HEX co
101. er f t l lt Twinaxial cable for setting up backup communication channel 15412 Important You cannot use peer to peer communication to communication between the primary and backup system because the backup processor listens but does not respond to communication received on a peer to peer communication channel You configure the primary and backup controllers for the backup communication channel through LIST Communication occurs via files that you specify in LIST Figure 3 6 Chapter 3 I O Communication Figure 3 6 Communication Flow Between Primary and Backup Controllers on a Backup Communication Channel Primary System Backup System Processor Memory Processor Memory output file inputfile input file outputfile Each input file must be large enough to store the data from the corresponding output file Otherwise a backup communication minor fault occurs 15413 A backup communication channel also prevents contention over the I O channel should the backup cable break or become disconnected If such a situation occurs the system with the highest resident number takes control over the I O You assign the resident and partner numbers see chapter 2 Installation of peer to peer and backup communication channels is described in the PLC 3 Family Controller Installation and
102. er generates a protected write command to write the value 17407 to word 121 of DH station 27 HO27 0121 17407 U The scanner generates an unprotected write command to write the value 17407 into word 121 of DH station 27 You can disable the transmission of unprotected commands through LIST options see chapter 2 Identifying Remote Stations Remote stations in an assignment command can be identified with an integer value Figure 5 10 a symbol a PLC 3 data table address or system symbol For example H STANUM N0 0 N0 0 STANUM 19 H N1 0 N0 0 N0 0 N1 0 19 H SMITH NO0 0 2 N0 0 SMITH is equated to N1 0 Chapter 5 Addressing DH and DH Data Transfers Programming Examples of This section gives examples of assignment commands using the four Assignment Commands available addressing methods Often the choice of addressing method and the structure of the data table section which is being addressed determines what data is actually sent Timers counters high order integers floating point and pointers are all stored in the PLC 3 memory as multiple words Each timer and counter contained in the PLC 3 uses 3 consecutive words one for the control bits one for the preset value and one for the accumulated value Timers and counters are stored in the following order CTL PRE ACC The PLC 3 stores high order integers and floating point numbers as two words Pointers consume three words each in PLC 3 mem
103. er than 271 bytes 16 detects a duplicate token on the link 17 recovers from a duplicate node condition 18 detects a link dead timeout 7 15 Chapter 7 Diagnostics Methods Table 7 H Data Sent in Response to a Diagnostic Status Command Byte 1 10 11 14 15 18 7 16 Description Operating status of PLC 3 processor 00 Program mode 01 Test mode 10 Run mode Not used 0 Normal 1 Major processor fault 0 Normal 1 Shutdown request c1 oy n S 0 Normal 1 Shutdown in effect 6 7 Not used Type of station interface and processor 0 3 6 scanner 4 7 4 PLC 3 processor O A D 3 i o e 3 D a e o o e e 5 c a A zi N Thumbwheel Mode control word The extended address of the mode control word is E0 0 0 8 a Starting byte address of the diagnostic counters Series and revision number of the module Even though the scanners are series A they appear as series E modules 0 3 0 Revision A scanner 1 Revision B scanner etc 0 Series A etc AB En 1 Series B Type of channel communications 0 Inactive 1 DH 2 DH 3 other 0 A G or earlier S5 or SR5 1 AH or later S5 2 AH or later SR5 3 unused A5 En 1 1 T 1 de unused The physical address of the unused word of PLC 3 system memory This is the physical address corresponding to the extended address E60 0 0 0 The total number
104. er with a leading zero For example the scanner interprets 17 in an expression as decimal 17 but it interprets 017 as an octal 17 or decimal 15 Chapter 6 Programming DH and DH Message Procedures Bit Operator The bit operator allows you to address a specific bit of a value stored under a user symbol For example 112 24 7 US_13 4 This statement puts the value 0 or 1 of bit number 4 of user symbol US_13 into input file 12 word 24 bit 7 The bit address itself can also be a user symbol or an expression For example 112 24 7 US_3 4 US_1 The expression 4 US_1 specifies a particular bit within user symbol US_3 The value appearing after the bit operator must be within the range of values allowed for bit addresses Since user symbols are 32 bit values a bit address for a user symbol must be in the range of 0 to 31 decimal Bit addresses for data table words must fall in the range of 0 to 15 decimal Logical Operators The logical operations are NOT AND and OR These operations construct logically true or false conditions You generally use them in decision statements such as the IF command The result of a logical complement is 1 true if the expression following the NOT is a value of 0 Otherwise the result is O false For example 112 24 NOT SYMBOL A If SYMBOL A is Then the scanner stores this value in input file 12 word 24 0 1 not 0 0 The result of a logical AND is 1 tr
105. es in the CCR ETX End of Text Checksum A 4 Appendix A Binary Command Language Circuit Control Request Response The scanner response to a master s CCR is a fourteen byte response Number Mod Type Max Max Control of and command response STX Code Bytes thumbwheel Series Rev block size block size Current Current Character command response timeout Protocol block seq block seq value fault code ETX Checksum Command Description STX start of text the first byte of the control block 02 hex Control Code Length of response block Module type and thumbwheel number Scanner Series Scanner Revision Maximum command block size Maximum response block size Current command block sequence Current response block sequence Character timeout value Protocol fault code ETX End of text Checksum Value echoes the control code byte two of the CCR Count of the remaining bytes including this byte and the ETX Module type in the upper four bits and the thumbwheel number in the lower four bits Scanner module s series number Scanner module s revision number Scanner module s maximum command block size in bytes Scanner module s maximum response block size in bytes The current command block sequence count as maintained by the scanner The current response block sequence count as maintained by the scan
106. es location 1 6 system 1 1 1 2 backup communications configuration 2 9 Index BCL A 1 commands _A 16 create A 32 delete A 33 LIST A 34 read block A 18 read block physical _A 26 read I O word _A 19 read section size _A 31 read word A 17 read modify write _A 23 reading data A 16 set CPU mode _A 35 set operating context _A 37 uploading downloading _A 26 verify block A 25 write block _A 22 write block physical A 28 write word A 21 writing data _A 21 extended addressing A 14 A 15 protocol A 1 A 13 binary command language See BCL bit operator 6 7 6 9 bitwise operators 6 10 block transfers 2 6 3 2 3 3 C cable lengths 1 16 2 3 cables for backup 1 12 DH or DH 1 14 1 16 lO 1 16 channel timeout 2 21 commands A 16 Data Highway Data Highways C 1 message procedure 6 13 comments in message procedures 6 1 communication rate 2 3 2 21 LIST selections 2 1 2 21 2 22 switch 1 8 comparison operators 6 12 complementary I O 2 7 configuration 2 1 2 3 2 21 backup communications 2 9 DH DH 2 10 Index peer to peer 2 8 CREATE command 6 13 6 14 D Data Highway command set listings _C 1 data transfers 5 1 DELETE command 6 13 6 14 delimiter label 6 15 logical address 5 2 logical ASCII 5 8 remote station 5 12 remote station type H 5 12 system symbol 6 6 DH configuration 4 3 conn
107. file Delimiter Symbolic address of file B1 5 012 Bit number 12 octal Delimiter Logical word address 11237 5 7 Chapter 5 Addressing DH and DH Data Transfers Using Logical ASCII Addressing 5 8 The logical ASCII addressing method allows you to communicate with another device by specifying an address based on the internal memory structure of the target device The scanner sends the address as a string of ASCII characters to the remote station Upon receiving the string of ASCII characters the remote station converts the data into a usable logical address The scanner offers two types of logical ASCII addressing data type and word range In both methods the scanner transmits the address as an ASCII string but the packet of data transmitted by the scanner on the DH DH link differs Data Type You can use Logical ASCII Data Type addressing to transfer data table sections without counting the actual words per data table structure With a data type packet the receiving station is notified of the type of data being sent Each station has a common understanding of how the different data types will be received It is the responsibility of the sending station to translate the way it stores a particular data type into this common structure before transmitting The receiving station then translates the structure into it s method of storage for that particular data type To format a logical ASCII d
108. fset is interpreted as octal if a leading zero is included otherwise the scanner interprets the number as decimal The receiving station must be able to interpret this form of addressing see Table 5 A Addressing Words To address a group of consecutive words in the remote stations memory use the following format Format Example offset size 047 20 5 3 Chapter 5 Addressing DH and DH Data Transfers You can only address a group of words as the source field in an assignment command The destination must be a file that is as large as or larger than the source size plus the offset Figure 5 2 Example for Addressing Consecutive PLC 2 Words 015 4 EN Number of words to be transferred decimal Delimiter Word offset from beginning of memory octal Address delimiter Addressing a single word is similar to addressing a word range only without specifying a size Format Example offset 047 Addressing a Bit To address a specific bit within a word use the following format Format Example offset bit 047 015 Figure 5 3 Example for Addressing Specific Bits in PLC 2 Memory 0121 010 L Bit number 10 octal Bit delimiter Word offset from beginning of memory octal Address delimiter Using PLC 3 Logical Binary Addressing Chapter 5 Addressing DH and DH Data Transfers When you use a PLC 3 logical binary address the scanner transmits the address to the
109. he Applies to a single Can be used anywhere in which it is generated procedure in which it is procedure or other in place of a logical plus any other procedure generated procedures nested address nested together with that together within that procedure procedure Global Local Applies to any context Applies only to the context in which the symbol is generated 12161 Chapter 6 Programming DH and DH Message Procedures Using User Symbols Using System Symbols A user symbol represents a numeric value You can generate a user symbol and assign a value to it by means of the assignment command see chapter 5 Type Description procedural The scanner recognizes procedural user symbols only in the procedure that you generate it in interprocedural The scanner recognizes interprocedural user symbols in the procedure that you generate it in and any other procedure nested within that procedure User symbols can contain data that is up to 32 bits long If the high order bits are insignificant that is if they can be truncated without changing the value of the data then the scanner can store the contents of the user symbol in a data field that is less than 32 bits long Attempting to put a data value into a field that is too small causes the scanner to generate error code 189 see appendix B Use a system symbol as either a procedure name or a symbolic address You must name a system symbol following the general
110. he message instruction determines which scanner actually transmits the command Chapter Objectives Addressing Field Parameters Interpreting Addresses Addressing DH and DH Data Transfers In chapter 4 we described how you can send a single message command or a message procedure containing a group of commands This chapter explains some general rules for specifying data addresses in message procedures for communicating over a DH or DH link To transfer data from one DH or DH station to another you program an assignment command into the scanner The assignment command enables you to copy information from a source to a destination In this chapter we use the following abbreviations to denote the parameters that you can specify as a source or destination for a data transfer Parameter Meaning bit number of a particular bit within the addressed word fileaddr logical address ofa PLC 3fle offset number of words between the beginning of the file and the desired word offset is zero for the first word of a file size number of words that transfer wordaddr logical address of a PLC 3 word wordsym symbolic address of a PLC 3 word You can use a value or an expression for any of the above parameters in an assignment command When using the above parameters the scanner interprets values as decimal base 10 unless you indicate that they are octal base 8 Specify an octal number by starting it with a leading
111. he message instruction 3 Choose a control file where status information about the message command can be stored The file should also be binary In Figure 4 2 we use binary file 200 word 0 4 Enteran extended address for the channel In Figure 4 2 we address the module status area of memory specify the scanner and a thumbwheel setting of 1 5 Specify message type 1 6 Entereither a command or a command procedure Figure 4 2 uses the command procedure PROC A DH DH Message Procedure The scanner has its own programming language that consists of commands see chapter 6 A group of related commands make up a DH DH message procedure These commands and message procedures determine what messages are transmitted over the DH or DH link Chapter 4 DH and DH Communication Data Transfers 4 8 The purpose of DH DH communication is to transfer data from one station processor memory location to another To accomplish these data transfers you can program the assignment command into the scanner Figure 4 3 is an example of an assignment command line For details see chapter 5 Since the following example does not specify a remote station this transfer occurs within the local systems memory Figure 4 3 Example Assignment Command Line B45 21 112 33 A BEEN Source Address Address Delimiter Assignment Command Destination Address Address Delimiter 11233 In the above example
112. hen reissue the command or response The scanner sends a NAK when it detects this timeout Appendix A Binary Command Language Response Timeout Master waiting for response block after ACK A response timeout occurs when the scanner does not send a response block back to the master within a given time after acknowledging receipt of a command block The master device determines the time allowed the scanner is not aware of this timeout Typically a one minute response timeout provides enough time for the scanner to respond without unnecessarily slowing the master device After a response timeout the master device sends a CCR to the scanner checks the protocol fault code in the CCR response refer to Table A A If the fault code is The master device 00 hex no fault or 05 hex no input buffer Clears its error count and retransmits the available last block terminates communication or tries to re initialize communication another fault code besides 00 or 05 hex or if the scanner does not respond to the CCR within one character timeout period Acknowledge Timeout Master or scanenr waiting for ACK The maximum amount of time the scanner waits for an ACK NAK or SO from the other device after sending a response or command is 2 seconds S4A used character timeout value Master must also select a value for this timeout This timeout should be treated as if a NAK were received The driver stops transmi
113. hoes the shift in character and resumes communication If the scanner does not echo the shift in character within one character timeout period the master device assumes that the character is not received and retransmits up to a maximum of three times After 3 unsuccessful attempts the master sends a CCR to the scanner and checks the protocol fault code in the CCR response If the fault code is 00 hex no fault or 05 hex no input buffer available the master should clear its error count and retransmit the last block Any other fault code returns or if the scanner does not respond to the CCR within one character timeout period the device should terminate communication Protocol Summary Figure A 1 summarizes the protocol used with BCL To read this diagram Use the To see left column what the processor expects to receive from your device second column possible processor responses to your transmission either e a processor response or e the action which the processor expects your device to take in response to its last transmission each remaining column Important Both the processor and the external device must respond to a break at any time Figure A 1 shows break conditions after each transmission but be aware that either the processor or the external device stops transmitting even in the middle of a block when it sees a break Figure A 1 BCL Protocol Diagram Appendix A Binary Command
114. is 1 active on the link 0 not on the link Important This table is updated even when the system is in program mode The rack range selection in LIST sets the range of assigned I O rack numbers The default setting for the rack number range is 0 76 If you plan to use rack numbers greater than 37 consider the following Each instruction in the ladder program that addresses an input or output in a rack greater than 37g uses one additional word of memory and increases the program scan time Typically the program scan increases about 0 01 milliseconds for each relay logic instruction XIC XIO OTE OTL OTU that address a bit in a rack greater than 37g The amount of memory required for the input and output sections depends on the highest rack number containing input or outputs respectively Therefore skipping rack numbers wastes memory The list configurable items for scanner number 1 also include selections for front panel channel 0 and the front panel data access display Select To enable you to set channel 0 parameters for the RS 232 C port labeled CHANNEL 0 on the front panel The parameter selections are described in the following sections display the privileges for the front panel display These privileges determine what you are allowed to accomplish through the front panel keypad The default for these privileges is 3 10 67 69 and 70 Chapter 2 Configuring the Scanner through LIST I T Defaults
115. ist press entry d Return When forming this list remember Selection of I O rack numbers greater than 37g increases the program scan time I O rack numbers that are not assigned consecutively cause greater memory requirements because memory has to be allocated for the unused racks You can connect up to 32 I O adapters to one I O communication channel on a scanner You can assign up to 16 different I O rack numbers to one scanner For duplicate I O addressing complementary I O or parallel output configurations you must have two chassis with the same assigned I O rack number and I O group number on different I O communication channels of the same scanner Refer to the PLC 3 Family Controller Installation and Operation Manual publication 1775 6 7 1 for detailed information on complementary and duplicate I O configurations ATTENTION Do not assign the same I O rack number and I O group number to two chassis on the same I O communication channel Failure to observe this warning could result in equipment damage and or unpredictable machine operation with injury to personnel The controller uses assigned I O rack numbers 77g 1778 2778 377g for internal communication Do not assign these numbers to an I O rack although you can use the associated addresses for internal storage For detailed information on 1 2 slot 1 slot and 2 slot I O addressing considerations refer to the Remote I O Adapter Cat N
116. ite data unprotected read and write commands can read or write to any section of the data table at a PLC 2 station Refer to publication 1771 6 5 1 for an explanation of protected and unprotected commands and memory access rungs A PLC 3 station can read from any part of a PLC 2 data table However a PLC 3 station cannot write to a PLC 2 station if the switch settings at the PLC 2 station do not allow access If the switches at the PLC 2 then a PLC 3 station can write by transmitting station are set to accept only to the PLC 2 data table in protected write commands memory areas defined by the protected write PLC 2 ladder program commands unprotected write commands any area of the data table unprotected write commands Chapter 4 DH and DH Communication Accessing a PLC 3 Processor from a PLC 2 Processor While a PLC 3 controller can address any area of a PLC 2 data table a PLC 2 reads an input file that is a part of the PLC 3 data table That file is the PLC 3 input file with a number that corresponds to the station number of the PLC 2 station For example the read write files assigned to PLC 2 stations 1 to 100 octal is PLC 2 compatible station number in octal Assigned input file for read write access 000 1008 001 1001 002 1002 003 1003 004 1004 005 1005 006 1006 007 1007 010 1010 011 1011 012 1012 077 1077 100 1100 Station address 000 is assigned to input file 1008 Otherwise PLC 3 input
117. lave 8 L J a L L a 9 ERES O Y Y N Peer to Peer 0o 7 Peer to Peer 7 Communication A Channel Communication A Channel Channel yo Peer to Peer 1 0 Channels Communication Channels Channels Note All Peer to Peer and I O Channels connect to the Terminal Swing Arm of the Scanner Module as shown in Figure 1 11 10741 To calculate the time required to send 200 words from the master to both slaves and have 200 words returned from each slave use the following procedure 1 400 words Two 200 word output files in master 400 words One 200 word output file in each slave 800 words 16 and rounding up 50 2 Allthe scanners used for peer to peer communication channel A have 4 active channels 3 From Table 3 C the nominal peer to peer time for 4 active channels and a communication rate of 115 2k is 10 5ms 4 Update time 10 5ms x 50 525ms 3 12 Chapter Objectives Introduction Chapter DH and DH Communication This chapter introduces some of the concepts and terminology involved with operating the scanner on a DH or DH communication The Allen Bradley DH and DH links are communication networks for industrial control applications Both links consist of a central trunkline cable that can be up to 10 000 feet long This cable can link together as many as 64 distinct communication points or nodes called stations Figure 4 1 Each station consists of some type of processor and a station interface
118. le initially the context that the processor is operating when communication is established all other memory levels You can change the default context by using the set operating context command Unless otherwise specified examples in this chapter assume that the default context is 1 You can use the default for any level except the lowest level of the address Appendix A Binary Command Language Table A E Extended Addressing X not used module status E2 module type thumbwheel switch module data module data module data 1 memory 1 15 2 main processor 3 scanner 5 communication adapter 6 expansion 7 S4B I O scanner 8 peripheral communication 9 DH II interface 14 memory communication data table context 1 15 section ile structure word 1 output image 0 07777 octal 2 input image 0 07777 octal 3 timers 9999 0 CTL 1 PRE 2 ACC 4 counters 9999 0 CTL 1 PRE 2 ACC 0 9999 0 lower 16 bits 1 upper 16 bits 0 9999 0 9999 0 9999 0 lower 16 bits 1 upper 16 bits 0 section file 1 word 0 0 0 0 5 integers 0 6 floating point 0 7 decimal 0 8 binary 0 9 ASCII 0 10 high order int 0 12 pointers 0 13 status 0 0 9999 ladder program E4 context 1 15 section instruction word 0 program status 0 32 767 0 32 767 1 main 2 subroutine 3 fault routine message context 1 15 section
119. les For example I1 0 19 shows that input file 1 contains 20 octal words You can create a larger file by entering the last word desired in the file when prompted for the file number in LIST By entering 11 50 for the input file the system will automatically increase input file 1 to 50 octal words To delete slave entries from the list press slave entry d Return 2 9 Chapter 2 Configuring the Scanner through LIST DH or DH Configuration When you configure channel 4 for DH or DH communication protocol you can set the following parameters node mode page 2 11 station number page 2 11 DH DH timeouts page 2 12 backup operation page 2 13 send unprotected page 2 14 accept upload download page 2 15 accept writes page 2 15 input file list page 2 16 privileges page 2 17 DH DH switch settings page 2 18 DH active node list page 2 19 DH active nodes to status file 6 page 2 20 When configuring channel four for a communication protocol the menu contains these selections n 91 1 CHAN 4 NODE MODE ON LINE OFF LINE STATION NUMBER 23 SELECTED 255 ACTUAL DH DH TIMEOUTS BACKUP OPERATIO SEND UNPROTECTED ACCEPT UPLOAD DOWNLOAD ACCEPT WRITES INPUT FILE LIST PRIVILEGES DH DH SWITCH SETTINGS DH ACTIVE NODE LIST DH ACTIVE NODES TO STATUS FILE 6 ER NEXT gt Oo 0 10O oO 4 CQ
120. lic address is of length zero or is longer than eight bytes write B 7 Appendix B DH DH Error Codes Meaning Error Code Error Type Associated Commands 236 PLC 3 read e File not found Destination address does not have enough levels to specify a PLC 3 word for word range reads or a file for file reads The PLC 3 address specifies more levels than required Word specified by the PLC 3 address does not exist PLC 3 bit write File not found Destination address does not specify a PLC 3 word The PLC 3 address specifies more levels than required Word specified by the PLC 3 address does not exist PLC 3 write Destination file not found Destination address does not point to a word for word range writes or a file for file writes Destination address specifies more levels than required First word of destination location does not exist 237 PLC 3 read and Any word in the total transaction does not exist in the destination file write e The source and destination files are not the same size 238 PLC 3 read and The file size decreased between packets of a multi packet transaction and write became too small for the total transaction 239 PLC 3 read and File is larger than 65 535 words write 240 PLC 3 read and Sum of total transaction size and the word level of PLC 3 addressing is greater write than 65 535 241 PLC 3 write Remote station does not have acces
121. ller system controller or the system ladder diagram or user program that controls ladder program PLC 3 processor operation Data Highway link DH link Data Highway Plus link DH link Industrial terminal system e g Allen Bradley 1784 T4 T47 programming terminal T53 or 6160 T60 terminals or an computer with 6200 software Preface In addition you may encounter words in different typefaces We use these conventions to help differentiate descriptive information from information that you enter while programming your scanner The Return key looks like this boldface and in brackets Return Words or commands that you enter appear in boldface For example 047 FILE A Variables that you enter appear in italics For example Type link node and press Return Messages or prompts on the screen look like this ENTER STATION AND INPUT FILE gt Type means type in the information Enter means type in the information and then press the Return key Chapter Objectives Scanner Features and Functions Scanner Hardware and Installation This chapter describes the features and functions of the 1775 S5 SR5 scanners the hardware components on the scanner how to install the scanner how to connect and configure the scanner to a n backup system Data Highway DH or Data Highway Plus DH communication network I O adapter for I O scanning
122. mand message command station transmits a reply message reply station The scanner can receive solicited and unsolicited messages depending on whether the message is a command from a remote station or a reply to a command from the local station If the local station issues the command message the corresponding reply message is said to be solicited because the local station has solicited or requested the data contained in the reply message fa remote station issues the command message that message is said to be unsolicited Either station initiates the data transfer by issuing a command message For a local station receives data and a local station sends data from a remote station during a to a remote station during a solicited messages read operation write operation unsolicited messages write operation read operation Chapter 4 DH and DH Communication In read operations the command message requests the data transfer but the corresponding reply message actually contains the data being transferred In write operations the command message contains the data being transferred and the reply message merely reports the status receipt or non receipt of the transfer Levels of Programming The PLC 3 processor must be free to control its own processes at the same time that the scanner is communicating over a DH or DH For this reason both the processor and the scanner have their own programs and programming langu
123. mmand generates a normal message For example HO27 115 4 lt 112 24 The scanner transmits a priority message to station 27 octal You can use the priority modifier with either type of assignment or Important For DH communication stations with high priority messages are given priority over stations with no priority messages throughout the command reply cycle For this reason you should only give a high priority designation to a command when special handling of specific data is required Using an excessive number of high priority commands defeats the purpose of this feature and could delay or inhibit the transmission of no priority messages Chapter 5 Addressing DH and DH Data Transfers 5 14 Important The scanner ignores the message priority modifier for DH messages Command Message Type Command messages can be protected or unprotected Protected commands can access only specified areas of data table memory at a PLC 2 station You need to send a protected write command only if a switch at the remote PLC 2 station prohibits other stations from sending unprotected write commands Unprotected commands can access any area of the data table For more information see chapter 4 By default the assignment command generates protected command messages To generate an unprotected command message enter a space followed by a U after the assignment command statement For example HO27 0121 17407 The scann
124. module The station interface module enables the processor to communicate with other stations on the DH or DH link The scanner is the station interface module for PLC 3 family controllers Table 4 A lists combinations of station interface modules and controllers 4 1 Chapter 4 DH and DH Communication Table 4 A Devices the Scanner Can Communicate with Across the DH and DH Network With this link type Using this device DH PLC 2 processor 1771 KA interface module 1171 KA2 communication adapter module PLC 3 processor 1775 S5 scanner 1775 KA interface module PLC 3 10 processor 1775 SR5 scanner 1775 KA interface module PLC 5 250 processor 5130 RM module 5130 KA module Computer interface using DF1 1770 KF2 interface module protocol 1771 KE interface module 1771 KF interface module DH bridge interface 1785 KA interface module DF1 Master or Slave bridge 1770 KF2 interface module interface 1771 KE interface module 1771 KF interface module DH 1785 KA3 communication adapter module 1775 S5 scanner 1775 SR5 scanner PLC 5 250 processor 5130 RM module 5130 KA module Computer interface using DF1 1785 KE interface module protocol 1770 KF2 B interface module DH bridge interface 1785 KA interface module DH II bridge interface 1779 KP5 foreign device interface module DF1 Master or Slave bridge 1785 KE interface module interface 1770 KF2 B interface module 4 2 Chapter 4 DH and DH Communication
125. n these two commands in the following 4 subsections Read Block Physical Hex 07 Parameters Physical address of the first word in the block number of words in the block Description The following command block uses a read block physical command to read 16 words starting with word 66120 10248 hex STX ISC SIZ CMD DAT ETX CHK 02 05 07 07 48 02 01 01 10 00 03 70 Appendix A Binary Command Language The data bytes store a least significant byte of the address 48 hex second byte of the address 02 hex third byte of the address 01 hex most significant byte of the address 01 hex least significant byte of the size word 10 hex most significant byte of the size word 00 hex The processor response to a read block physical command is the same as the response to a read block command see Read Block Command page A 18 When uploading to a computer you need to know how much memory is actually used You can find the address of the last word used in memory with the following algorithm 1 Read words 35 and 36 2 Use the least significant byte of word 35 plus word 36 as the three least significant bytes in a physical address 3 Subtract 9 from the physical address in step 2 4 Read2 words starting from the result of step 3 5 Theleast significant byte of the first word plus the second word read in step 4 contain the three least significant bytes of
126. ncorrect causing this error include TAC 15 C5 3 TACCUM 23 etc The key data table word specifier is four characters long and began with a T C or P but it does match the legal word specifiers e g TACM 3 No colon following a legal word specifier B 5 Appendix B DH DH Error Codes Error Code Error Type Associated Meaning Commands Missing colon between file and word Illegal word specifier in a data table address local Illegal context specifier When an expression determines the context in a data table address or when a data table address specifies the global context context 0 and a colon follows the context local Attempt to execute a symbol not defined as a process The system symbol exists but refers to a symbolic address rather than to a process Not a DH DH procedure local Either the number or the expression following the in an address has a value outside the range 0 to 15 decimal Value specified in a bit assignment statement was other than a zero or a one Illegal use of EXIT command Illegal use of STOP command STOP command encountered in procedure Attempt to read write at bad address Unable to evaluate the expression in the given base This occurs if the argument of a FROMBCD function is not a valid BCD bit pattern or if invalid characters occur in numeric values e g 57 12X Function being used is not defined Expression is too complex
127. nd Language Read Block Command Hex 1F Parameters Starting address size in words of the block Description The read block command reads a block of information starting at a specific address If you specify 0 for the size the processor returns the data from the address specified to the end of the section if this does not include more than 63 words or 63 words starting with the address specified if the section is larger The following example command block reads the first two words of the input section DAT 3C 02 00 00 00 02 00 ETX 03 CHK 6D STX 02 ISC 01 SIZ 08 CMD 1F The data bytes store address mask 3C hex address byte specifying section 2 input 02 hex address byte specifying file 0 00 hex address byte specifying structure 0 00 hex address byte specifying word 0 00 hex lower byte of size word 02 hex upper byte of size word 00 hex Notice that the size is specified in a word two bytes This is true of all size specifiers within the data buffer of a command block The processor responds to a read block command with one of the following response codes Response Codes Hex Description 00 Success 01 Size too big 04 Address unknown 05 Address invalid end of section 06 Access not allowed 08 Address not complete If a success size too big or address invalid end of section code returns the next byte contain
128. nd for generating symbolic addresses with the CREATE command for allocating file space in PLC 3 programming Use the DELETE command to delete message procedures from memory delete symbolic addresses delete interprocedural user symbols Using the DELETE command on a Deletes the procedure name name and erases the named procedure from memory symbolic address or user symbol symbol but the data stored under that symbol remains intact To delete a local symbol a local procedure or a procedural user symbol use the DELETE command by itself the modifier LOCAL is optional To delete a global symbol a global procedure or an interprocedural user symbol use the modifier GLOBAL after the DELETE command You can abbreviate the modifier GLOBAL to G and LOCAL to L For example D G PARTS PG The scanner deletes the global procedure PARTS PG from PLC 3 memory Execute Command EXIT Command GOTO Command Chapter 6 Programming DH and DH Message Procedures To execute a message procedure enter the delimiter followed by the procedure s name For example FIRST_PROC The scanner executes the procedure FIRST PROC You can use procedure names anywhere that commands are used This way one procedure can execute call another procedure This allows for nesting of procedures However you cannot nest more than 3 layers deep The EXIT command terminates execution of the current message procedure If
129. nd unprotected commands do not select send unprotected protected commands only An asterisk displays in front of this selection to indicate that it is enabled 2 14 Chapter 2 Configuring the Scanner through LIST 6 Accept Upload Download Select the Accept Upload Download option from the configuration screen to determine if the scanner can execute upload and download commands sent by another station You use a sequence of upload and download commands to transfer memory information from the controller to another station or from another station to the controller If you Then the scanner select accept upload download can execute both upload and download commands do not select accept upload download cannot execute upload and download commands An asterisk displays in front of this selection to indicate that it is selected 7 Accept Writes Select the Accept Writes option from the configuration screen to determine if the scanner accepts write commands sent by a remote station If you Then the scanner select accept writes accepts write commands if the channel has the privilege to write to the specified memory area and the assigned privilege is independent of the memory protect keyswitch see Privileges page 2 17 do not select accept writes does not accept write commands under any condition If the assigned privilege is not independent of the keyswitch the scanner checks the keyswitch
130. ner The character timeout value in 10 s of ms If zero then see Table A A for default The protocol fault code The possible fault codes are listed in Table A B 03 hex The last byte in the CCR response is a checksum The checksum is the least significant eight bits of the sum of all the above bytes in the response A 5 Appendix A Binary Command Language A 6 Table A B Fault Code HEX fault code value Description 00 No fault 01 Checksum error 02 Format fault missing ETX 03 Format fault other 04 Input buffer overflow 05 No input buffer available 06 Previous buffer still in progress 07 Command block sequence count error 08 Receiver error FF Unknown protocol failure Block Sequence Counts Both the master and scanner maintain a command block sequence count and a response block sequence count These counters are separate entities and do not necessarily agree The scanner checks the command block sequence when received compares it to its own version of the command block sequence count increments the command block sequence count when a valid command is received The response block sequence count is incremented and sent out by the scanner The master checks the response block sequence count when received and compares it to its own version of the response block sequence count Appendix A Binary Command Language Command Block With the exception of the CCR all commands sent from the master
131. nes 3 and 4 while the second ON_ERROR command applies to command line 5 STOP Command Using Functions Chapter 6 Programming DH and DH Message Procedures If an error occurs in a command line that is not associate with an ON_ERROR command the procedure stops executing See Recovery from Erros page 7 1 Refer to Appendix B for a listing of the error conditions The STOP command terminates execution of the message instruction in the ladder program This means that the STOP command stops execution of the current procedure and all procedures nested together with the current one The format of the STOP command is the single letter S without any modifiers or parameters Each main procedure and nested procedure must end with either an EXIT or a STOP command The STOP command is a extreme means of terminating a message procedure so you should only use it when no other action is possible The normal means of terminating a procedure is the EXIT command The STOP command generates error code 179 see Appendix B In addition to containing commands and nested procedures a message procedure can also contain functions You can use the following functions anywhere expressions are used Figure 6 4 TO BCD FROM BCD The TO BCD and FROM BCD perform opposite conversion functions Figure 6 4 Example Command Lines Using the TO BCD and FROM BCD Functions D 12 TO BCD 27 COUNT FROM BCD D 12 4 Functi
132. nner module and the I O chassis on the corresponding I O channel is properly established Configured for FLASHING There is a fault on one or more of the I O chassis on the I O scanning corresponding I O channel OFF No I O chassis are configured on the corresponding I O channel or the channel is inactive CHx N The channel is functioning properly Configured for FLASHING The input file is too small at the processor receiving data The peer to peer slave or master does not exist Communication retry communication OFF The channel is inactive CHx ON The channel is functioning properly Configured for FLASHING The input file is too small at the processor receiving data The backup partner is not responding communication OFF The channel is inactive Chapter 1 Scanner Hardware and Installation DH DH Status Indicators The five indicators labeled XMTG RCVG RDY ERR and DIS Figure 1 2 show you the status of the DH or DH channel Indicator When this led is on the scanner is XMTG transmitting a message RCVG receiving a message RDY ready to transmit a message ERR red programming or communication error detected DIS yellow DH DH connectors are disabled or duplicate DH station address if blinking When the scanner is polling both the XMTG and RCVG LEDs turn on
133. ns 0 0 0 ccc cece cece eee eas Message Procedure Commands 0 00e0000s CREATE Command 5 oo oci qoe disputo dt Rc den oz DELETE Command deck cierre PE ERE PKERERIS Execute Command 0000s cece ce eee ee eee EXIT Command cits catback dde ewe QUE ACC EE ERAN GOTO Command ic eceRIXPEPCercA ive 4 4 PERRO ER PCOMMANG mec ON ERROR Command 0 0c eee eee eee eee STOP Conimal esien aks neon dts Ee eee Using Functions a na anaana cc cee een eee Adding Comments to Your Message Procedure Programming Examples for a Message Procedure Diagnostics Methods 0ecee eee ene eee Chapter Objectives issus ro Re pa ved ER rr ER DH DH Message Procedure Diagnostics Diagnosing Faults with Module Status Indicators Remote I O Adapter Faults Status File 2 I O Communication Retry Counts Status File 3 Retries for a Peer to Peer or Backup Communication Channel DH DH Indicators 00 0 ccc ccc cents Table of Contents DH DH Diagnostic Assignment Command Binary Command Language Introduction 0 0 0 ccc eee eee eens ProloCOl icis neisenreIuxuerit e dea prex dee weeks amp Extended Addressing 0 00 cece eee n ence eens Commands 0 00 c ccc RII DH DH Error Codes
134. o 1771 ASB User s Manual publication 1771 6 5 83 2 7 Chapter 2 Contiguring the Scanner through LIST Peer to Peer Master Configuration When you configure a channel as a master on a peer to peer communication channel you must enter the following parameters Parameter Description Master number identifies the master for communication with the slaves Each peer to peer communication channel can have one master only The master number and all slave numbers must be unique and selected from numbers 81 through 89 Slave numbers identify the slaves that communicate with the master Each master can communicate with up to 6 slaves The slave number must be unique and selected from numbers 81 through 89 Input files identify the files that receive data from each slave You must specify an input file for each slave in the input image section of the data table If you do not make a selection the file defaults to input file 1 The files also must be large enough to store the data from each slave s output file If the file is not large enough the processor declares a minor fault Output files identify the files that send data to each slave You must specify an output file for each slave in the output image section of the data table If you do not make a selection the file defaults to output file 1 LIST displays the size of the input and output files For example 11 0 19 shows that input file 1 contains 20 octal word
135. ode in the data buffer The following example response block shows a read I O word command when no forces exist STX OSC SIZ RSP DAT ETX CHK 02 01 03 03 61 1C 03 89 The data bytes store lower byte of the data word 61 hex upper byte of the data word 1C hex If any other response code is returned no data follows Writing Data You can write data into processor memory either in individual words with the write word command or in blocks with the write block command You can also modify words in processor memory with the read modify write command The following two subsections explain the writing data commands Write Word Command Hex 14 Parameters Address that needs to be updated and the new data Description The following example command block writes new data into address E3 1 5 0 0 0 STX 02 ISC SIZ CMD DAT ETX CHK 01 08 14 3C 05 00 00 00 08 9t 03 FC The data bytes store address mask 3C hex first address byte 05 hex Second address byte 00 hex third address byte 00 hex fourth address byte 00 hex lower data byte 08 hex upper data byte 91 hex Appendix A Binary Command Language The processor responds to a write word command with one of the following response codes Response Codes Hex Description 00 Success 04 Address unknown 06 Access not allowed 08 Address not complete
136. of words in the PLC 3 system memory both used and unused Introduction Protocol Appendix Binary Command Language The scanner communicates through the peripheral channel 0 on front panel with a programming device or another external control device such as a computer The scanner uses the binary command language BCL for communication This chapter describes the protocol and commands of BCL and briefly reviews PLC 3 addressing BCL is a master slave communication protocol in which the scanner is the slave and the external device must act as the master As slave the scanner cannot initiate any communications The BCL protocol defines the rules of communication between the scanner and an external control device It includes the method of initiating communication format in which information must be sent to the scanner format of scanner responses amount of time which may elapse between commands without causing the scanner to declare a channel timeout and stop communicating Timeouts BCL protocol uses four timeouts to determine if a communication problem occurs These timeouts guard against stopping or unnecessarily slowing down the scanner or the master device when communication is terminated unexpectedly such as when a cable is detached If you see It means Channel Timeout scanner waiting for command Character Timeout master or scanner waiting for next character in block Response Timeout master waiting for re
137. ommunication rate for each device when operating any of the other communication channels at 230 4 kbps Otherwise I O rack retries and missing inputs in a listen only mode backup system can result ATTENTION Channel 4 cannot be configured for DH or DH 2 3 Chapter 2 Configuring the Scanner through LIST 2 4 Operating Mode You can select one of the following operating modes for the corresponding communication channel inactive O scan peer to peer master peer to peer slave backup communications DH communications channel 4 only DH communications channel 4 only These selections identify what the channel is being used for The default is I O scan An asterisk displays next to the current mode of the channel To change the mode you select the number that corresponds to the desired mode and reconfigure the channel For channel 4 the protocol switch must be selected for LIST configurable for you to change the operating mode through LIST refer to Setting the Protocol Communication Rate and Station Address for Channel Four page 1 7 Important If you are not using a communication channel set the operating mode for the channel to inactive This causes the scanner to stop communicating through the channel improving the communication times on the other active channels Auto Configuration Auto configuration first creates a new I O chassis list in which each I O chassis has equal p
138. on Parameter Function Assignment Command Destination of Resulting Value 11245 6 17 Chapter 6 Programming DH and DH Message Procedures You must enclose the parameter of the function in parentheses The parameter can be a an a direct numeric value either decimal or octal expression user symbol logical address symbolic address TO_BCD Function The TO_BCD function converts its parameter into a binary coded decimal value that is 32 bits long For example the TO_BCD function in Figure 6 4 stores the number 27 in binary coded decimal format in word 12 of the decimal section of memory After this function executes word 12 contains the following bit pattern 0000 0000 0010 0111 FROM BCD Function The FROM BCD function converts its parameter from binary coded decimal format to binary format The resulting value is 32 bits long For example the FROM BCD function in Figure 6 4 converts the contents of decimal word 12 from binary coded decimal to a regular decimal value of 27 After this function executes the FROM BCD function stores the following bit pattern in user symbol COUNT 0000 0000 0000 0000 0000 0000 0001 1011 Chapter 6 Programming DH and DH Message Procedures Adding Comments to Your You can add comments to any command line in a message procedure To Message Procedure do this enter a semicolon after the command Then enter your comment after the semicolon Figure 6
139. or 1775 S5 SR5 Modules If the station address between The backup scanner module assumes a station address that is 00 and 37 40g and 77g 40g higher than the assigned station number 40g lower than the assigned station number When you do not select backup you assign a unique DH 000g to 376g or DH 00g to 77g station number to the scanner module in the primary processor and the one in the backup processor The backup continues to operate with the same station number even after the switchover ATTENTION To guard against personal injury and damage to A equipment do not assign the same station number to both scanner modules if you have not selected backup mode If both scanners are assigned the same number and backup is not selected two stations with the same station number attempt to communicate on the link This can cause unpredictable machine motion 5 Send Unprotected Select the Send Unprotected option from the configuration screen to determine if the scanner can send unprotected command messages to other stations You use command messages to communicate with other controllers on a DH or DH network You can use an unprotected command to read or write to any area of another station s data table a protected command to write to those areas of another station s data table specified by the station that receives the command If you Then the scanner can send select send unprotected both protected a
140. or either in individual words using the read word command or in blocks using the read block command You can also read from the data table I O section using the read I O word command This command obtains an I O word and the associated force information from the processor The byte increment decrement command adds or subtracts one to a specified byte We describe these four read type commands in the following subsections Appendix A Binary Command Language Read Word Command Hex 12 Parameters Address of required word Description The following example command block reads file 0 word 3 of the data table status section STX ISC SIZ CMD DAT ETX CHK 02 05 04 12 24 oD 03 03 54 The data bytes store address mask 24 hex address byte specifying status section 13 OD hex address byte specifying word 3 03 hex The processor responds with one of the following codes Response Codes Hex Description 00 Success 04 Address unknown 06 Access not allowed 08 Address not complete If a success code is returned the next two bytes in the response block contain the data stored at the requested address with the lower byte sent first STX OSC SIZ RSP DAT ETX CHK 02 01 03 00 05 08 03 16 The data bytes store the data word lower byte 05 hex upper byte 08 hex If any other code returns no data follows Appendix A Binary Comma
141. ory Table 5 B PLC 2 Logical Data Addressing Data Addressing Description HO21 040 B3 write data from entire binary file 3 to remote station 21 beginning at word 40 octal H021 040 B3 5 20 write the twenty words beginning at binary file 3 word 5 to remote station 21 beginning at word 40 octal HO21 40 B3 5 write binary file 3 word 5 to remote station 21 word 40 decimal HO21 040 5 B3 5 13 write binary file 3 word 5 bit 13 to remote station 21 word 40 octal bit 5 H021 040 lt B3 5 as a priority message write binary file 3 word 5 to remote station 21 word 40 octal If the scanner is configured for DH the priority modifier is ignored 4 H021 040 B3 5 U send an unprotected write of binary file 3 word 5 to remote station 21 word 40 octal 5 15 Chapter 5 Addressing DH and DH Data Transfers 5 16 Table 5 C PLC 3 Logical Binary Addressing Binary Addressing HO2SFO 0 F0 0 6 D0 0 HO54 E0 0 0 14 4 HO14 TO 5 T4 2 H046 N0 0 N4 1 HO55 N1 NO H02 H0 0 H0 0 6 Table 5 D Logical ASCII Data Type Addressing Data Type Addressing N0 10 H003 N55 0 100 D0 0 HO55 N0 0 HO20 B10 10 15 dHO14 T5 T4 4 HO2S F0 0 F0 0 6 Description write 6 contiguous words beginning with floating point file 0 word 0 to remote station 2 floating point section file 0 word 0 A total of three complete floating point words 2 words
142. oss Attention helps you Identify a hazard Avoid the hazard recognize the consequences Important Identifies information that is critical for successful application and understanding of the product Additional Information Summary of Changes Summary of Changes In general we improved the format and added greater detail to this manual We have also corrected incorrect and confusing concepts throughout the manual The following table lists specific changes we made since We have To chapter Appendix Added details concerning 230 4 kbps support Updated LIST configuration capabilities and displays added the new feature DH Active Nodes to Status File 6 Included the recommended numbers for assigning to slaves and masters in a Peer to Peer configuration link Added extensive text concerning DH addressing on e PLC 2 logical data e PLC 3 logical binary Logical ASCII e data type e word range e Additional examples of each type of addressing Added the feature of identifying remote stations in an assignment command with a symbol Added a new chapter Diagnostic Methods Expanded Binary Command Language Table of Contents Summary of Changes lseeeeee 1 1 Additional Information 2 00 0 c cece ee eee 1 1 Using this Manual leere P 1 Manual Objectives 0 00 e eee eee eee eee P 1 What this Manual Contains 0
143. packet with a bad CRC 14 received a frame that was beyond the legal limit of 250 bytes 15 does not have the buffer space for a received message 16 received a message that was previously received 17 received aborted frame line noise 18 amp 19 successfully sent a message 20 amp 21 successfully received a message 22 amp 23 successfully sent a command 24825 successfully receives a repy 0000 26827 successfully receives command 38829 successfullysendsareply 0 30 can not send a reply Chapter 7 Diagnostics Methods Table 7 G DH Diagnostic Counters Byte This counter increments when the scanner 1 amp 2 successfully sent a message 3 amp 4 successfully received a message 5 can not deliver a message due to a NAK or after using up maximum retries 6 did not receive a response before the response timeout value was reached 7 received a NAK 8 must send a message retry as a result of CRC error illegal length not its destination the source was not the expected station or a timeout 9 sent a NAK because there was no memory available 10 sent a NAK because of the received message contained an undefined LSAP 11 receives a message which was received previously 12 has to send a token pass retry 13 receives an aborted packet 14 receives a packet that had a CRC error 15 receives an illegal size packet which was either less than 3 bytes or larg
144. particular remote error code varies depending on the type of communication interface module at the remote station If the remote station is a PLC 3 controller with a scanner as the interface module the remote error codes have the meanings listed in Table B A For the meanings of other remote error codes refer to the appropriate user s manual for the communication interface module at the remote station Error Code 32 34 35 37 81 83 Table B A Apendix B DH DH Error Codes Local and Reply Error Codes Associated Commands diagnostic read PLC PLC 2 read PLC PLC 2 bit write PLC PLC 2 word write PLC 3 read PLC 3 bit write PLC 3 write PLC PLC 2 PLC 3 read and write Meaning The size of the local file involved in a file assignment command is greater than 65 535 bytes A station number greater than 376 octal is specified for the remote address in an assignment command Attempt to send unprotected command is invalid The per packet timeout set through LIST runs out before receiving a reply This means that the remote station acknowledges ACK the command message but does not send the reply in the allotted time cf error 92 e A 2 byte ADDR and 1 byte SIZE field is missing after the FNC byte in the command message The number of bytes of data requested in the SIZE field is greater than the maximum number allowed per reply packet 244 or SIZE is 0 zero The required 2 byte ADDR
145. pes of backup configurations two scanners in the same processor chassis for backing up the link Both scanners are active and each one is an independent station on the link You assign unique station numbers to each scanner If you want to send the same message through both scanners you must program separate message instructions scanners in a backup system One scanner is in the primary system and one scanner is in the backup system For detailed information on backup systems refer to the PLC 3 Family Controller Backup Concepts Manual publication 1775 6 3 1 By inserting multiple scanners in the same PLC 3 or PLC 3 10 system you can operate a single system on more than one link In this configuration each scanner connects to a different link and each has a unique station on its associated link However all the scanners in the same system can have either the same or different station numbers ATTENTION If such a PLC 3 station is communicating A through a PLC 2 buffer file on a DH link and all of the station s scanners have the same station number then all of the scanners transfer data through the same buffer file This can cause unpredictable results if several scanners try to read or write to the buffer file at the same time see Accessing a PLC 3 Processor from a PLC 2 Processor page 4 11 When such a PLC 3 station transmits a command message to a remote DH or DH station the thumbwheel number specified in t
146. programming terminal scanner in another PLC 3 or PLC 3 10 chassis The 1775 S5 SR5 scanner has four communication channels to communicate with any of the following I O adapters cat no 1771 AS ASB node adapter devices a scanner in a backup PLC 3 or PLC 3 10 processor a PLC 5 products in adapter mode up to six PLC 3 or PLC 3 10 processors On channel 4 you can communicate with these additional devices up to 64 stations on a DH or DH link programming terminal In the following chapters we describe how to configure and operate these channels Table 1 A summarizes the operating features and functions Chapter 1 Scanner Hardware and Installation Table 1 A 1775 S5 SR5 Scanner Features and Functions Features Functions Four I O communication Communicate with I O adapter modules in an I O chassis You channels can connect up to 32 I O chassis to one I O channel The scanner can communicate with up to 4 096 I O I O scan priority Scan the I O chassis according to a sequence that you select DH DH channel Communicate with other Allen Bradley controllers and or computers on a DH or a DH channel Also provides direct connection for a programming device Status indicators Keeps you informed on the scanner s status including e forces in the system e DH DH channel e O communication channels Thumbwheel switch Distinguishes one scanner from another You can have up to e 15 scanners in a PLC
147. ps of words are provided for the message tasks since the scanner can execute four message instructions at once Within each message task the words contain the following information Task Word Contains the 0 error code for the last error that occurred in the message task 1 total number of errors that occurred in the message task 2 value 1 3 line number where the error occurred in the highest level nest level 1 message procedure 4 line number where the error occurred in the next highest level nest level 2 message procedure 5 line number where the error occurred in the lowest level nest level 3 message procedure Chapter 7 Diagnostics Methods The line number is the relative location of a command line from the beginning of the message procedure containing the line The first line of each procedure is line number 1 and any following lines are numbered in ascending sequence Nested procedures begin with line 1 again thus the need for words 3 4 and 5 in the error block Important You do not enter the line numbers for a procedure the scanner automatically keeps track of the line numbers for you The error block retains its data even after the message procedures complete execution The block does not reset automatically Error Block Operation Figure 7 1 illustrates how the error block works In this figure an addressing error invalid destination address occurs in procedure SUB2 which is nested 3 levels deep Wo
148. r replacing one scanner with another restore the previously stored memory configure each 1775 85 SR5 scanner communication channel in LIST Failure to observe this caution could result in equipment damage and or undesired machine operation 1 11 Chapter 1 Scanner Hardware and Installation Connecting to a Backup System 1 12 With a backup system if a major fault occurs the primary system shuts down and the backup system takes over the outputs to enable your process to continue To set up a backup system connect a backup cable cat no 1775 CBA CBB from the 6 pin connector labeled BACK UP on scanner number 1 in a primary system to the backup connector on scanner number 1 in a backup system see Figure 1 8 Figure 1 8 Connecting the Scanner to a Backup System Primary System Backup System ae it g gaa a a rm ili b 4 s lt 2 Backup Cable 1 j i i LU cat no 1775 CBA MEINE G U ic jo CBB Cy jc E U E EX z z n U E Exe ze ft 15406 ATTENTION When using a backup system A Do not backup a 1775 S5 SR5 scanner with a 1775 S4A S4B or SR scanner f
149. r this statement in the procedure S 6 17 Terminate execution of the message MSG instruction in the ladder program You can abbreviate each command to the letters shown in the format and Explanation column of Table 6 D We recommend that you use the command abbreviations because they make the commands easier to program save memory space reduce execution time You can insert spaces in command lines to make the message procedure easier to read However you should keep spaces to a minimum because they use memory space and slow execution of the message procedure 6 13 Chapter 6 Programming DH and DH Message Procedures CREATE Command DELETE Command 6 14 The CREATE command generates a symbolic address and assigns it to a logical address To create a local symbolic address use the CREATE command by itself the default modifier LOCAL is optional To create a global symbolic address use the modifier GLOBAL after the CREATE command A procedure executing in any context can use any global symbolic address whereas local symbolic addresses are recognized only by procedures executing in the same context In either case the symbol has meaning only at the station where it is created You can abbreviate the modifier GLOBAL to G and LOCAL to L For example C G QTOTAL E0 0 0 7 The scanner creates the global system symbol TOTAL to represent the logical address E0 0 0 7 Do not confuse this CREATE comma
150. rd of the error code gives the line number where error occured in procedure 5 SUB2 4 SUB1 that executed procedures SUB2 3 MAIN that executed procedure SUB1 Chapter 7 Diagnostics Methods Figure 7 1 Error Block Operation Error Block Line Number Procedure Word Contents decimal MAIN e 0 124 e 150 SUB 1 e 1 e 1 1 SUB 1 2 e e 150 M 3 28 SUB 2 e e 4 28 e 5 SUB 2 5 e e e 5 6 12 COUNT e e 11247 ON ERROR or IF commands can contain an embedded command to execute another procedure In these cases the scanner treats the embedded execute command just like a nesting level Figure 7 2 Chapter 7 Diagnostics Methods Figure 7 2 Example Procedures Showing ON_ERROR Nesting Error Block Line Number Procedure Word Contents decimal MAIN 1 ON ERROR GSUB1 0 160 e e 10 De 1000 1 2 e e 2 1 1 SUB1 3 e 4 8 e 8 e e 25 0 N 5 0 e e 11248 In this example Figure 7 2 an addressing error in line 10 of procedure MAIN causes the ON ERROR command to execute The ON ERROR command calls for execution of procedure SUB1 But SUB1 also contains an error The error in SUB1 is the last one detected so it is the one finally reported in the error block Since procedure SUB1 is called by the ON ERROR command in procedure MAIN the nesting for SUBI is 2 levels deep
151. rder and priority that the scanner scans the I O chassis You do this by listing the I O chassis in the order that you want the scanner to communicate with them This allows you to assign a higher priority to some I O chassis than to others by listing the higher priority chassis more than once For example suppose your I O chassis scanning sequence list has six entries and entries 1 and 4 are the same Then the scanner updates the chassis listed as entries 1 and 4 twice as often as the other chassis Each I O chassis is listed once in the default configuration at initial power up or after auto configure You can alter the list to repeat a chassis as often as desired provided that the list contains no more than 32 entries An asterisk appearing before an entry in the list indicates that the corresponding I O chassis or adapter is faulted To enter a chassis into the I O chassis scanning sequence use the format shown in Figure 2 2 Figure 2 2 Entering a Chassis into the I O Chassis Scanning Sequence List entryl racklsizelI O grouplattributes Position of entry in the lorF scanning sequence list Chassis is for inputs only Assigned I O rack F Major fault is declared if chassis faults number 0 3763 Y Starting I O group Number of I O groups in lt ___ number in the chassis 0 2 4 or 6 the chassis 2 4 6 or 8 15439 Chapter 2 Configuring the Scanner through LIST To delete entries from the l
152. rdless of whether the output file is updated Figure 3 3 Example Rungs in the Transmitting Controller on a Peer to Peer Communication Channel CTU 10001 COUNT UP C0008 CU 17 CP 10 MN E DN CA 6 15 MOV MOVE FROM ATO R A WCACC 0008 6 R WO001 005 0000000000000110 MVF C0009 FILES FROM ATO R EN 12 C0009 A FB001 0000 DN R F0001 0010 12 COUNTER C0009 C0009 POS LEN 0 10 ER MODE ALL SCAN 12 3 5 Chapter 3 I O Communication 3 6 Important You can control the information that is transferred by using multiple rungs to transfer different information to the output file depending on the rung conditions However remember that the output file contains only the last data that moves into each location The peer to peer transfer is independent of program scan and a file can be transferred before being fully updated by the ladder program Figure 3 4 shows an example of the ladder rungs that receive data in input file FIO01 Data in the input file of the receiving controller corresponds to the data in the output file of the transmitting controller In the example rungs shown in Figure 3 3 and Figure 3 4 input word 5 of the receiving controller reflects accumulated value for counter 8 in the transmitting controller the first 10 words of binary file 1 in the receiving controller reflect the status of the corresponding words in the transmitting controller In both examples remember
153. remote station as a six level extended address This addressing method is normally reserved for communication between PLC 3 scanners since the receiving station must be able to interpret this form of addressing see Table 5 A The following rules apply when specifying a PLC 3 logical binary address 1 You must define symbolic addresses to either the word level or the file level of specification 2 A word address can be either a logical word address symbolic address of a word symbolic file address followed by a colon and an offset extended address specified to the word level 3 You must precede a size specification with a word address and a comma 4 You must precede an offset specification with a file address and a colon 5 You must precede a bit number with a word address and a slash 6 You can use extended addressing to access the pointer section of memory Addressing a File To address a file use either a file address or a file symbol Format Example fileaddr NO filesym QFILE A For assignment commands that copy data from one file to another both the source and the destination file must be exactly the same size 5 5 Chapter 5 Addressing DH and DH Data Transfers 5 6 Addressing Words To address a group of consecutive words in memory use one of the following formats Format Example N0 47 20 QFILE A 15 25 QWORD 1 20 wordaddr size filesym offset size words
154. riority with no attributes assigned Then the scanner reconfigures The scanner performs an auto configure at power up for an I O scan configured channel that has no entries in its I O chassis scanning sequence list When forming the I O chassis list during an auto configuration the scanner polls all valid addresses If the scanner receives response to an address it adds that address to the list To assign attributes or priorities to the I O chassis add them manually through LIST and reconfigure the channel Chapter 2 Configuring the Scanner through LIST You can only perform an auto configuration when the controller is in program load mode power is applied to the I O chassis the processor restart lockout switch is set to allow the I O chassis to be restarted from the processor If power is not applied to the I O chassis the processor attempts to perform an auto configure and since the I O chassis does not respond the scanner does not enter it in the I O chassis list For an entry to get into the I O chassis list in auto configure a valid path must exist between the scanner and the I O adapter module for the I O chassis ATTENTION You can replace a 1775 S4A SR scanner with A a 1775 S5 SR5 scanner however you must perform a logical save of memory without saving the module status area E2 1 clear memory after replacing one scanner with another restore the previously stored memory configure each 1775 8
155. ription 00 Success 01 Size too big Both responses are followed by ASCII data in the data buffer The size too big response indicates that the response contains more than 64 words In this case the processor continues to send response block until the entire response has been transmitted All response blocks except one containing the last block of data use the size too big response The last block uses the success response The following example response block shows a successful LIST command STX OSC SIZ RSP DAT ETX CHK 02 32 10 00 ASCII data 03 The first LIST command which you send should not have any data in the command buffer The processor response to this first command contains the initial data which appears on the terminal CRT after you enter the LIST command Other LIST commands generally contain data in the command block Set CPU Mode Command Hex 2A Parameters Flag byte Description You can change the processor operating mode with the set CPU mode command The flag byte allows you to change the operating mode to program load test or run Figure A 5 It also allows you to keep other remote devices from communicating with the processor by setting the remote lock bit Important The remote lock bit is not the same as remote enable which is set in LIST Appendix A Binary Command Language Figure A 5 CPU Mode Flag Byte 7 6 5 4 3 2 1 0 Bit
156. rst The two bytes following the section size contain the number of next levels of addressing For example in context 1 of the data table the number of next levels corresponds to the number of data table sections such as output input or integer And in the integer section the number of next levels corresponds to the number of integer files The following example response block shows successful read section size command STX OSC SIZ RSP DAT ETX CHK 02 14 07 00 08 28 00 00 19 00 03 69 A 31 Appendix A Binary Command Language A 32 The data bytes store the data word first size byte 08 hex Second size byte 28 hex third size byte 00 hex fourth size byte 00 hex first byte of next level s word 19 hex second byte of next level s word 00 hex If any other response code is returned no data follows Create Command Hex 17 Parameters Address of the last word structure file or section Description The following example command block creates 10 words in integer file 5 if integer file 6 does not already exist STX ISC SIZ CMD DAT ETX CHK 02 0C 06 17 3C 05 05 00 0A 03 7E The data bytes store address mask 3C hex first address byte section 05 hex Second address byte file 05 hex third address byte structure 00 hex fourth address byte word 0A hex If the words ha
157. s You can create a larger file by entering the last word desired in the file when prompted for the file number in LIST By entering 11 50 for the input file the system will automatically increase input file 1 to 50 octal words To delete slave entries from the list press slave entry d Return Peer to Peer Slave Configuration When you configure a channel as a slave on a peer to peer communication channel you must enter the following parameters Parameter Description Slave number identifies the slave that communicates with the master The slave number must be unique and selected from numbers 81 through 89 identifies the master on the channel The master number and all slave numbers must be unique and selected from numbers 81 through 89 Master number identifies the file that receives data from the master This file must be in the input image section of the data table If you do not make a selection the file defaults to input file 1 This file must be large enough to store the data from the master s output file Otherwise the processor sets the peer to peer minor fault bit identifies the file that sends data to the master This file must be in the output image section of the data table If you do not make a selection the file defaults to output file 1 Input file Output file 2 8 Chapter 2 Configuring the Scanner through LIST LIST displays the size of the input and output files For example I1 0
158. s that execute report generation procedures In this way the scanner can indirectly cause execution of a report generation procedure that displays a message on the operator s terminal 6 21 Chapter Objectives DH DH Message Procedure Diagnostics Diagnostics Methods This chapter describes how the scanner detects and reports various types of errors Appendix B lists all the errors reported by the scanner Error Reporting When an error occurs the scanner automatically creates and stores the error code in the interprocedural user symbol ERROR You should reserve the symbol ERROR exclusively for error reporting ERROR contains only the last error encountered during execution of a command or message procedure The scanner clears the ERROR symbol whenever a procedure is finished even a called procedure If you want to save the error code or manipulate it in any way you can use an assignment command to copy the code into a more permanent storage word Recovery from Errors Unless you specify differently the scanner stops executing the current message procedure as soon as the module detects an error To specify a different action use the ON_ERROR command in the message procedure Then when the scanner encounters an error it performs the action specified in the nearest preceding ON_ERROR command After the module completes executing the ON ERROR action it resumes executing the message procedure at the command line following the
159. s the number of data words returned The data follows this byte Appendix A Binary Command Language A success code returns when the number of data words returned equals the number requested For example STX OSC SIZ RSP DAT ETX CHK 02 01 06 00 02 04 03 OF 02 03 26 The data bytes store Size byte 02 hex lower byte of the first data word 04 hex upper byte of the first data word 03 hex lower byte of the second data word OF hex upper byte of the second data word 02 hex A size too big code returns if the number of words requested requires a response block larger than 63 words In this case 63 words return An address invalid end of section code returns when the number of words requested extends beyond the end of this section The data from the specified address to the end of the section returns If the processor returns any other response code no data follows Read I O Word Hex 23 Parameters Address of required word Description You must send the I O address using the following format Figure A 2 Figure A 2 1 0 Address Format 8 Output Word Rack Number I O Group Number b Input Word Rack Number I O Group Number 12136 Appendix A Binary Command Language The following example command block uses the read I O wor
160. s timing and programming considerations when using the scanner for I O communication and helps you learn how T O scan affects ladder program execution to calculate block transfer times to program and calculate times for a peer to peer or backup communication channel You must remember that in scanning the ladder program and the I O input changes do not instantly appear in the input image table The length of time between an input change and the update of the input table depends on the input module delay the signal propagation time backplane access time and the I O scan time the I O scan is not synchronized with the ladder program scan Therefore the same inputs can be in different states at different times during the program scan Calculating the I O Scan Time The amount of time that the scanner takes to scan all the I O on a given channel depends on the communication rate and the number of entries in the I O chassis scanning sequence list active channels on the scanner block transfers retries required due to noise Table 3 A shows the scan times for one I O adapter on each active channel with no block transfers 3 1 Chapter 3 I O 3 2 ommunication Table 3 A 1 0 Scan per I O Chassis in Milliseconds 3 Not DH DH 7 7 5 DH DH Not DH DH DH DH N A Not DH DH 6 DH DH N A Each I O chassis that you add to the scanning sequence list including repeated I O chassis in the li
161. s to the destination file e No privilege for upload download e Words already created or already deleted 245 restart No previous shut down command received Module being sent message does not exist Should also get BAD ADDRESS major system fault B 8 Appendix DH and DH Command Set Introduction Table C A lists the DH and DH commands supported by the scanner For detailed information on using these commands refer to the DH DH Command Set User s Manual publication 1770 6 5 16 The scanner can transmit 12 different commands on the link The addressing method determines which command is to be sent Table C A Basic Commands Addressing Method Command CMD Hex FNC Hex PLC 2 logical data Protected write block N A Unprotected read block EN N A Protected write bit N A Unprotected write bit N A Unprotected write block EN N A PLC 3 logical binary Write block 00 Or Read block 01 Logical ASCII word range Ex s Logical ASCII data type Write block 67 Read block 68 Specifications Specification Function Location I O Capacity per Scanner Communication Rates in kbps Cabling Nominal I O Scan Times Per I O Adapter at 115 2Kbaud Backplane Current Environmental Conditions Appendix 1 0 communication DH communication DH communication backup communication peer to peer communication front panel support 1775 S5 single slot in a PLC 3 chassis 1775 SR5 single
162. serere Introduction 0 0 0 ccc ccc ete RII Local Error Codes 21 0 ccc ccc cece RR Reply Error Codes 0 0 cece ccc eens Remote Error Codes 0 ccc cece eee ee eens DH and DH Command Set Introduction 0 0 0 cece ee ee eee eee eee eens Specificalions 2 25522 nah ERRARE EXER REG xxn Preface Using this Manual Manual Objectives This preface tells you how to use this manual properly and efficiently for the tasks you have to perform Read this chapter before you program a PLC 3 family programmable controller What this Manual Contains Chapter What s Covered Appendix 1 Using this Manual Manual s purpose audience and contents 2 Scanner Hardware Hardware components and procedures for installing a and Installation scanner 3 Configuring the Using the LIST function to configure the scanner Scanner Through LIST 4 1 0 Communication Timing and programming considerations when using the scanner for I O communication 5 DH and DH Concepts programming and timing considerations Communication 6 Addressing DH and Specifying data addresses in message commands that DH Data Transfers communicate over a DH or DH 7 Programming DH and Operating the message instruction to communicate DH Message over a DH or DH Procedures 8 Diagnostic Methods Techniques and indicators for monitoring scanner status A Binary Command Commands used by an external control device to
163. slot in a PLC 3 10 chassis 2 048 I O any mix 4 096 I O complementary 57 6 at 10 000 cable ft DH DH 1 0 115 2 at 5 000 cable ft I O only 230 4 at 2 000 cable ft I O only Twinaxial Cable cat no 1770 CD for I O DH or DH communication channels Industrial Terminal T50 Cable cat no 1784 CP5 for DH communication to T50 industrial terminal 4 5ms for 1 channel 5ms for 2 channels 5ms for 3 channels 6 5ms for 4 channels 8ms for 3 channels DH 9ms for 3 channels DH 6 0A maximum from 5V 20mA maximum from 15V Operating Temperature 0 to 60 C 32 to 140 F Storage Temperature 40 to 85 C 40 to 185 F Relative Humidity 5 to 95 without condensation 1770 CD 1 2 1771 AS 1 1 1771 ASB 1 1 1 16 1775 M 1 10 2 1 1775 A2 1 10 1775 A8 1 10 2 1 1775 CBA 1 12 1775 CBB 1 1 1775 GA 6 2 7 2 1775 KA _7 2 1775 S5 1 1 1 11 1775 SR5 1 1 7 2 7 2 A accept upload download LIST selection 2 15 arithmetic operators 6 10 writes LIST selection 2 1 allocating memory 6 3 assignment command 5 12 6 13 examples 5 12 formatting 5 13 command line for data transfers 4 8 parameters 5 1 auto configuration 2 4 backup cable 1 2 1 12 1 16 3 7 3 8 communication channel installation 1 16 operation 3 3 3 5 programming 3 8 timing 3 10 configuration LIST selections 2 8 connector 1 2 PLC 3 or PLC 3 10 processor 1 1 switches 1 10 switch
164. sponse block after ACK Acknowledge Timeout master or scanner waiting for ACK Appendix A Binary Command Language A 2 Channel Timeout Scanner waiting for command A channel timeout occurs when the scanner is waiting for a command and does not receive one within the specified time You can select the channel timeout through the LIST function The front panel timeout value defaults to 10 seconds Selecting a value of zero disables the channel timeout When a channel timeout occurs the scanner stops communicating through channel 0 The master must then re initialize the communication Character Timeout Master or scanner waiting for next character in block A character timeout occurs when the time between characters bytes in a command block response block CCR or CCR response is greater than the character timeout value The master can set the scanner s character timeout value by sending the desired value within the CCR If the master sends a zero value the scanner defaults to the character timeout value appropriate for the current communication rate configuration as shown in Table A A Table A A Communication Rate Configuration Communication Rate bps Character Timeout Default Value 110 1 second 150 600 ms 300 300 ms 600 150 ms 1200 to 19 2 80 ms If the master or a scanner records a character timeout it must be treated as if a NAK were received They stop transmitting for one character timeout value and t
165. st increases the I O scan time Number of Active I O Channels li 8 N A 6 5 When you add block transfer modules to the channel the I O scan time increases by approximately 1ms per adapter on all channels while the scanner executes the block transfer instruction Calculating Block Transfer Times The time required to complete a block transfer depends on the number of O channels on the scanner that contain block transfer I O modules active I O channels on the scanner entries in the I O chassis scanning sequence list for the channel block transfer I O modules on the channel To calculate the time required for the scanner to execute all block transfers on the channel and be ready to execute the block transfer again 1 Determine the number of active I O channels on the scanner 2 Determine the number of I O channels with block transfer T O modules 3 Determine the nominal block transfer time see Table 3 B Peer to Peer and Backup Communication Chapter 3 I O Communication Table 3 B Nominal Block Transfer Times in Milliseconds for a Block transfer Instruction Channels with block Number of active channels transfer I O modules n 1 35 2 36 3 38 4 40 4 Count the number of block transfer I O modules on the channel If the chassis containing a block transfer I O module appears more than once in the I O chassis scanning list count the module once each time the chassis appears in the list 5
166. subtraction multiplication and division These are binary not BCD operations that produce 32 bit signed integer results You should assign a result from these arithmetic operations to a 32 bit destination However you can assign the result to a 16 bit destination if the result is small enough in absolute value less than 65 535 to fit into 16 bits If you assign the result to a 16 bit word and the result is too large to fit into 16 bits then an error code of 215 results The scanner does not indicate overflow or underflow conditions with arithmetic operations Chapter 6 Programming DH and DH Message Procedures Shift Operators The scanner supports the following shift operators If you see It means the bit shifts lt lt left gt gt right The shift operators shift binary values a specified number of bit positions to the left or right When a left arithmetic shift lt lt executes zeros shift into the rightmost bits of the expression The leftmost bits shift out of the expression and are lost thus possibly changing the sign bit The left bit shift operates in this manner whether operating on 16 or 32 bit values PUMP PUMP lt lt 1 PUMP Value Bit Pattern 32 bits Decimal Value Before operation 100 00000101 2147483643 After operation 000 00001010 10 In a similar manner when a right bit shift gt gt is executed on a 16 bit value in the data table zeros shift into the leftmost bi
167. t the symbol did not begin with an missing in a CREATE system symbol address command line Attempt to delete nonexistent symbol 140 e Unrecognized or ambiguous command e Channel 4 not configured for DH DH Illegal data following GOTO command Illegal use of label e g not in a procedure 144 all Label not found Duplicate label User symbols must be distinct from labels Too many nested procedures Insufficient privilege for the specified operation This error can occur when an attempt is made via the assignment command to write into a major section of memory in which the scanner does not have access privileges namely major section 0 1 or 2 Unbalanced parenthesis in expression A procedure name is used in a field that requires a symbolic address or a user symbol variable A label is used in a field that requires a symbolic address or a user symbol variable Error in reading address for symbol entry Illegal symbol in expression Bad level specified in extended address More than nine levels specified in an extended address e Something other than a or a number followed a in an extended address local Unrecognized section specifier An illegal character followed the in an address 161 local a Bad timer or counter specification e The first letter of the data table address is a T C or P but four characters are not in specification Addresses that are i
168. tes store address mask 0C hex first address byte 905 hex Second address byte 05 hex Appendix A Binary Command Language The processor responds to a delete command with one of the following response codes Response Codes Hex Description 00 Success 03 Unavailable section does not exist 04 Address could not exist invalid values 06 Access not allowed 08 Insufficient address not specified to at least three levels OF No privilege The following example response block shows a successful delete command STX OSC SIZ RSP ETX CHK 02 11 01 00 03 17 LIST Command Hex 29 Parameters none required Description The LIST command accesses the LIST function This command allows you to send ASCII characters to the processor These characters are interpreted in the same manner as if they were entered from the processor front panel or the keyboard of a programming device see chapter 3 The processor remains in the LIST processing mode until it receives either a command block which does not contain a LIST command or a break character The following example command block uses the LIST command with no data in the command buffer STX ISC SIZ CMD ETX CHK 02 31 01 29 03 60 A 34 Appendix A Binary Command Language The processor responds to the LIST command with one of the following response codes Response Codes Hex Desc
169. the physical address of the last word used in memory Figure A 4 Figure A 4 Finding the Address of the Last Used Memory Word Result of step Word 35 Woas Description 1 1101100000000000 0000000001101001 2 0000000100000000 0000000001101001 Points to word 105 3 0000000100000000 Points to word 96 4 1000001100000001 Contents of words 96 and 97 5 0000000100000001 0000000001000000 Points to word 65600 the last unused memory word Although uploading does not require a complete shutdown of the processor memory must not be created or deleted during the upload operation Therefore be sure that no scanner or other module is creating or deleting memory and making changes in LIST during an upload operation Appendix A Binary Command Language Example Upload The following sequence of command and response blocks performs an upload The upload includes 4DD hex words and is performed in 10 hex word blocks All values are shown in hexadecimal Device STX ISC SIZ CMD DAT ETX CHK 02 07 o 00 00 00 Of 10 00 03 pic 3 STX OSC SIZ RSP DAT ETX CHK 02 22 00 10 data 03 Device STX ISC SIZ CMD DAT ETX CHK 02 07 07 10 00 00 Of 10 00 03 pic 3 STX OSC SIZ RSP DAT ETX CHK 02 22 00 10 data 03 Device STX IS
170. to handle command block at this time character timeout value exceeded The master stops transmitting within one half of the character timeout period after receiving the NAK code The master increments its error count and If the error count is The master less than three retransamits the block after one character timeout period three stops trying to transmit the block If the master does not receive an ACK or NAK code within one character timeout period after transmitting the command block it continues as though it received a NAK Handshaking After receiving a response block from the scanner the master responds within a character timeout period with one of these codes If you see It means that ACK 06 hex the command block was received correctly and that normal communication is to continue NAK 15 hex an error was detected in the response block and instructs the scanner to retransmit the block The scanner tries three times before terminating communication SO 0E hex the master needs time to process the response and instructs the scanner shift out to wait The scanner must wait for the master to send a shift in character OF hex before continuing communication A shift in character indicates that the master is ready to continue communication Appendix A Binary Command Language When the master is ready to restart communication with the scanner It sends a shift in character The scanner ec
171. ts of the expression The rightmost bits shift out of the expression and are lost As shown in this example the sign can change when using the shift operators on 16 bit values N0 1 NO 1 gt gt 1 N0 1 Value Bit Pattern 16 bits Decimal Value Before operation 10000011 00000000 32000 After operation 01000001 10000000 16768 However the right bit shift works differently when the operation is performed on 32 bit values such as are created with user symbols and also values in the high order integer data table section In this case the leftmost bit of the expression does not change If the leftmost bit is a Then a 1 is shifted in from the left a 0 is shifted in from the left 6 11 Chapter 6 Programming DH and DH Message Procedures 6 12 Since the leftmost bit of an expression is the sign bit this means that the right bit shift on a 32 bit value does not change the sign of the numeric value The rightmost bits still shift out of the value and are lost as shown in the following examples GRINDER GRINDER gt gt 1 GRINDER Value Bit Pattern 32 bits Decimal Value Before operation 100 00000101 2147483643 After operation 110 00000010 1073741822 HO 1 HO 1 gt gt 1 H0 1 Value Bit Pattern 32 bits Decimal Value Before operation 010 00000101 1073741829 After operation 001 00000010 536870914 Comparison Operators Comparison operators result in a value of
172. tting for one character timeout value and then reissues the command or response A 3 Appendix A Binary Command Language Circuit Control Request CCR The master uses the circuit control request CCR to initiate reset or verify communications with the scanner The CCR consists of five bytes of data defined as follows Character STX Control Code Timeout Value ETX Checksum Command Description STX start of text Control code the first byte of the control block 02 hex In the control code byte bits 7 6 5 and 4 contain the value 1 0 0 and 0 respectively This is necessary for the scanner to recognize the byte as a control code The meaning of the other bits in the control code is as follows set timeout value ze reset command block seq cntr reset response block seq cntr reset communications Character Timeout Value The third byte is the character timeout value If bit 3 in the above control code is set this byte sets the character timeout value The timeout is 10 ms times the value in this byte which allows timeout values between 10 and 2550ms If bit 3 in the control code is not set this byte is zero A zero in this byte causes a default character timeout as shown in Table A A 03 hex The fifth and last byte in the CCR is a checksum The checksum is the least significant eight bits of the sum of the previous four byt
173. turns on a bit locally for either 300 seconds or until the remote bit goes false ON ERROR LOG ERROR log errors and time of day A 0 initialize error pointer interprocedural user symbol CREATE GQTIM START B0 0 timer start word local system symbol CREATE TIM_CTL STCTL 1 timer control word CREATE QTIM PRE STPRE 1 timer preset word ON BIT 0 timer on bit procedural user symbol DONE BIT 017 timer done bit CREATE PROCESS N3 7 process word PON BIT 5 process on bit ON 1 OFF 0 LOOP1 check remote bit in loop B0 0 1 H023 B5 3 2 fetch and save remote bit IF B0 0 1 EQ OFF GOTO LOOP1 TIM_PRE 300 set timer for 300 sec GTIM START T ON BIT ON turn timer rung condition on QGPROCESS P ON BIT ON turn process on LOOP2 check timer and remote bit in loop B0 0 1 H023 B5 3 2 fetch and save remote bit IF B0 0 1 EQ ON AND TIM_CTL T_DONE_BIT EQ OFF GOTO LOOP2 PROCESS P_ON_BIT OFF turn process off EXIT Procedure LOG_ERROR This procedure reads th rror block out of the module status area and records it along with the time of day in status file 9 CREATE STATUS S9 CREATE ERR_BLK E2 3 TH 3 5 4 0 CREATE TOD S1 3 STATUS A ERR_BLK 26 copy error block 26 words STATUS A TOD 2 copy time of day hrs mins IF ERROR G
174. ty bit in each character received odd the channel transmits an odd parity bit with each character and checks for an odd parity bit in each character received none the channel does not transmit a parity bit and does not check for parity bits An asterisk displays next to the current parity state stop bits You can specify the number of stop bits that channel 0 uses to communicate The stop bit 1 selections are 1 1 5 and 2 An asterisk displays next to the current stop bit selection To change the number of stop bits type the number corresponding to the desired selection channel timeout You can specify the amount of time that the processor allows between operations on a 10 000 ms channel before terminating communication This amount can be set up to a maximum of 32 767ms 32 7675 If you want to disable the timeout function set the value to 0 2 21 Chapter 2 Contiguring the Scanner through LIST 2 22 Reconfiguration This selection implements changes that you have made in LIST for channel 0 If channel 0 is being used when you reconfigure it the changes are not implemented until communication on the channel is terminated and then re established An asterisk appears next to Reconfigure when a change has been made to any of the channel 0 parameters The asterisk is removed after a successful reconfigure Chapter Objectives Effect of I O Scan on Program Execution I O Communication This chapter describe
175. u can access the LIST function for the scanner through a programming terminal or the data access panel on the PLC 3 or PLC 3 10 main chassis cat nos 1775 A1 A3 Refer to the PLC 3 Family Programmable Controller Installation and Operation Manual publication 1775 6 7 1 for detailed information on operating the LIST function Important The scanner limits the number of executing LIST functions to four for any PLC 3 or PLC 3 10 system Figure 2 1 shows you the parameters that you select for the scanner You access these selections by doing the following 1 Enter LIST The system displays the initial LIST menu 2 Select option 6 for MODULE STATUS 3 Select the number corresponding to the scanner that you want to configure The system displays the following menu 1775 S5 1 CHASSIS 0 SLOT 3 1 CHANNEL 1 HANNEL 2 HANNEL 3 HANNEL 4 ACK RANGE HAN 0 ISPLAY ER NEXT 0 0 WN HUQuNuQOO 2 1 Configuring the Scanner t System Mode 1 Test Monitor 2 Run Monitor 3 Program Load 4 Remote Enable 5 System Status 6 Module Status Enter Next 6 3 Modules 1 01 1775 ME 2 01 1775 L3 3 01 1775 85 Enter Next 3 1775 85 1 Chass 1 Slot 3 1 Channel 1 2 Channel 2 3 Channel 3 4 Channel 4 5 Rack Range 6 Chan 0 7 Display Enter Next gt The asterisk indicates the default selection 2 2 The heading for this menu shows the scanner
176. ue if the expression preceding the AND and the expression following the AND are both non zero Otherwise the result is O false The result of logical OR is 1 true if either the expression preceding the OR is non zero the expression following the OR is non zero or both expressions are non zero Otherwise the result is O false 6 9 Chapter 6 Programming DH and DH Message Procedures Bitwise Operators Bitwise operators manipulate the individual bits in a 32 bit operand The bitwise 32 bit complement BNOT inverts the state of each bit in the 32 bit expression That is bits set to 1 invert to 0 and bits set to 0 are invert to 1 The bitwise 32 bit AND BAND forms a bit by bit logical AND of two 32 bit operands No carry occurs from one bit position to the next within the operand For example A contains the bit pattern 10101010010011110010101010101011 B contains the bit pattern 01110101011100100010101110001010 Then the assignment C A BAND B yields C contains the bit pattern 00100000010000100010101010001010 The bitwise 32 bit EXCLUSIVE OR BXOR forms a bit by bit logical XOR of two 32 bit operands No carry occurs from one bit position to the next within the operand The bitwise 32 bit OR BOR forms the bit by bit logical OR of two 32 bit operands No carry occurs from one bit position to the next within the operand Arithmetic Operators The arithmetic operations are addition
177. unication Module cat no 1775 GA Table 6 A gives an example of how to edit the message instruction in the ladder program For more details on ladder program editing refer to the user s manual for your programming device Table 6 A Entering the Message Instruction into the Ladder Program Prompt if any Action Start editing session Insert a new rung Enter the bit that conditions the message rung Enter the message instruction ENTER FILE Enter the address of the file where the message resides in ADDRESS memory This file should be binary ENTER SYSTEM Enter the channel designation for the scanner ADDRESS OR SYMBOL For example E2 3 4 e E2isthe module status e 3isthe scanner module type e 4isthe thumbwheel number ENTER MESSAGE Enter the message type This is always 1 TYPE Enter a single assignment command or the name of a message procedure In this case the message procedure name is PROC End the editing session Chapter 6 Programming DH and DH Message Procedures Figure 6 1 Examples of Message Instructions Reading word 5 of binary file 3 at station 045 into word 17 of integer file 4 MSG STAT 10012 MESSAGE TYPE EN CTL FB200 0000 000 12 01 CH E2 3 1 SA N4 17 H045 B3 5 a STAT ER 13 Destination Source local remote Execute procedure PROC_A MSG STAT 10012 MESSAGE TYPE EN CTL FB200 0000 000 12 01 CH E2 3 1 ND PROC_A STAT ER
178. update a specific input file on the peer to peer or backup communication link use the following procedure 1 Determine the number of words in the output file being sent to this specific input file Divide by 8 and round up Determine the total number of slaves on the link Determine the greatest number of active channels on any scanner on the peer to peer communication link Find the nominal peer to peer time by using Table 3 C and the result of step 2 Multiply the results of steps 1 2 and 4 Update time Nominal time x output words 8 x number of slaves Figure 3 8 shows an example of 3 PLC 3 controllers using peer to peer communication to communicate with each other on one channel and with other PLC 3 controllers on other channels For this example assume that each output file has 200 words 3 11 Chapter 3 I O Communication Figure 3 8 Example Configuration for a Peer to Peer Communication Channel Peer to Peer Peer to Peer Communication Communication Channel A Channel A Processor A Processor B Processor C Master Slave S
179. ur H z ON S A J L Terminator switch at bottom edge of module 18754 Setting aTerminator on a Communication Channel On the bottom edge near the front of the scanner is a set of four switches With these switches you can connect a terminator across the line when the scanner is an end device on a DH DH I O peer to peer or backup communication link Figure 1 4 on the corresponding channel Important When using internal terminators removing the terminal swing arm from the scanner causes the communication channels to be unterminated You may want to leave the switch up and install the optional 1770 XT external 150 ohm terminator Chapter 1 Scanner Hardware and Installation When a channel is configured for a communication rate of 230 4 kbps the corresponding terminator switch must be up away from the board An external 82 ohm terminator must be used in this configuration Figure 1 4 Setting a Terminator on a Communication Channel ifi 12 3 4 V Down toward board 4 Up away from board When DOWN a 150 ohm terminator is connected on the corresponding communication channel 15422 Setting the Protocol Communication Rate and Station Address for Channel Four On the top edge near the rear of the scanner are two sets of switches You can use these two sets of switches to set the protocol communication rate and station address Figure 1 5 and Figure 1 6 You can set the protocol for DH link DH
180. uto with controllable down up both switchback Auto with no switchback down up primary up up backup Manual up down both 1 If you are not operating a backup system then set switches 2 and 3 to the UP position The backup switches for scanners other than thumbwheel number 1 should be set away from the board Installing the Scanner After you configure the scanner insert the scanner into any slot of a PLC 3 processor chassis cat no 1775 A1 A2 PLC 3 10 processor chassis cat no 1775 A3 PLC 3 and PLC 3 10 CPUs scanners and memories are not interchangeable Chapter 1 Scanner Hardware and Installation The chassis electromechanically interlocks helping to guard against inserting or removing modules while power is on scanner while power is on This could result in equipment ATTENTION Do not change the thumbwheel setting on a damage PLC 3 and PLC 3 10 systems require a scanner with the thumbwheel set to 1 If you are using a multi chassis system the scanner set to 1 must be in the chassis with the front panel You can operate a 1775 S5 scanner with a 1775 S4A S4B scanner in a PLC 3 system and a 1775 SR5 with a 1775 SR scanner in a PLC 3 10 system However note the following cautions ATTENTION You can replace a 1775 S4A SR scanner with a 1775 S5 SR5 scanner however you must perform a logical save of memory without saving the module status area E2 clear memory afte
181. ve already been created the processor sends an available response code 02 hex The command also tells the processor to create the pointers for integer files 0 thru 4 if they did not already exist although no words are allocated to these files Appendix A Binary Command Language The processor responds to a create command with one of the following response codes Response Codes Hex Description 00 Success 01 Size too big 02 Available address specified already exists 04 Address could not exist invalid values 08 Address insufficient exists but no specific to word level OF No privilege The following example response block shows a successful create command STX OSC SIZ RSP ETX CHK 02 11 01 00 03 17 Delete Command Hex 18 Parameters Address of the first word structure file or section to delete Description The delete command deletes or reduces sections in PLC 3 memory If you specify a word structure or file the processor deletes all higher addresses at the same level For example if integer file 5 contains words 0 thru 100 deleting word 10 also deletes word 11 thru 100 On the other hand deleting the integer section does not delete any other section The following example command block deletes from integer file 5 to the end of the integer section STX ISC SIZ CMD DAT ETX CHK 02 0D 04 18 0c 05 05 03 44 The data by
182. want to use the default input file you can use the input file list selection Upon selecting input file list the list of remote station addresses and associated input files displays Initially the list is empty and default assignments do not display unless you enter them Important You can assign a remote station to only one input file but you can assign different remote stations to the same input file Chapter 2 Configuring the Scanner through LIST To add a station address and input file to the list enter a colon followed by the station address a space and the input file number For example INPUT FILE LIST STATION FILE 0 2 25 2 64 6 265 7 1237 4 ENTER STATION AND INPUT FIL gt 6 4 Fl You can specify an octal station number by starting it with a leading 0 Otherwise the scanner treats it as a decimal number The file number is always treated as a decimal number To specify station addresses for stations on remote links you can enter link node To remove a station from the list enter the station number followed by D For example ENTER STATION AND INPUT FILE gt 1 37 D This example removes link 1 station number 37 from the input file list Another example ENTER STATION AND INPUT FILE gt 5 D This example removes station number 5 from the input file list 9 Privileges Select the Privileges option from the configuration screen
183. ym size You can only address a group of words as the source field in an assignment command The destination must be a file that is as large as or larger than the source range Figure 5 4 Example for Addressing Consecutive PLC 3 Words N 15 0 20 Address of first word to be transferred Number of words to be transferred Delimiter 11236 Addressing a single word is similar only without specifying a size Format Example wordaddr N0 47 The scanner interprets wordaddr as an octal value if the addressed word is in an input or output file Otherwise it interprets wordaddrasa decimal value You cannot use the pointer data table specifier in an assignment command To access words in the pointer section of the PLC 3 data table you must use the PLC 3 extended addressing format For example E3 1 12 0 5 0 1st word of pointer 5 E3 1 12 0 5 1 2nd word of pointer 5 Chapter 5 Addressing DH and DH Data Transfers Refer to the PLC 3 Family Controller Programming Manual publication 1775 6 4 1 for detailed information on extended addressing Addressing a Bit To address a specific bit within a word use one of the following formats Format Example wordaddr bit N0 47 015 filesym offset bit QFILE A 15 8 wordsym bit QWORD 1 012 Figure 5 5 Examples for Addressing Specific Bits in PLC 3 Memory FILE A 16 8 Bit number 8 decimal Delimiter Word offset from beginning of
184. you want to execute just a single assignment command that is not longer than 120 characters you can enter that command in the message instruction block Table 6 A If you want to execute more than one assignment command you must create a message procedure to contain those commands The execution of a single assignment command takes place once the scanner receives the message instruction from the CPU However when a message instruction contains a message procedure the scanner must first store the symbols within your procedure into system memory and begin retrieving the procedure lines from system memory Allow for this initialization time when initiating procedures After this initial time the commands within a procedure execute as fast as single commands within a message instruction 6 1 Chapter 6 Programming DH and DH Message Procedures Editing the Message Instruction The general steps for editing a DH or DH message procedure are 1 Create and edit the ladder program containing message instructions that control execution of the message procedure 2 Allocate memory to the necessary data files 3 Create and edit the message procedure You can perform these steps through your programming terminal Refer to its user s manual for detailed information on creating and editing the ladder program You can also perform the third step through an RS 232 C data terminal connected to an RS 232 C channel on a Peripheral Comm

1775-6.5.5, PLC-3 Family I/O Scanner Comunication

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