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1. Table A 3 Point Type 0 Configurable Opcode Table A 4 Point Type 1 Discrete Input Parameters uu esos dee epu SENS un Deu UE DUDEN OR MR MN UU Table A 5 Point Type 2 Discrete Output Parameters Table A 6 Point Type 3 Analog Input Parameters i ion reta tech S nce a e vele face Me a ld tee e Table 7 Point Type 4 Analog Output enne Table A 8 Point Type 5 Pulse Input Parameters ses Table A 9 Point Typ 5 PIED POtSnielefe Rev 7 95 Modbus Program User Manual Table A 10 Point Type 7 Flow Parameters Table A 11 Point Type 9 Local Display Panel LDP Parameters eee Table A 12 Point Type 10 AGA Flow Value Parameters Table A 13 Point Type 11 Tank Parameters Table A 14 Point 12 Clock Parameters n RE DURER Table A 15 Point Type 13 System Flag Parameters sss Table A 16 Point Type 14 Communication Port Parameters esee Table 17 Point 15 System Variables Fas cu enn Dx Esser Ras du Gen bU Table A 18 Point Type 16 PST Register Parameters eere Table A 19 Point Type 17 Soft Point iet tin Table A 20 Point Type 19 Database Setup Parameters sse Table A 21 Point Type 20 ROC Task
2. O92 U9 U9 WwW WW U9 Interim Rev 7 98 A 21 Modbus Program User Manual This page intentionally blank A 22 Interim Rev 7 98 Modbus Program User Manual APPENDIX B PROGRAMMING EXAMPLE The following documentation is for FST programs used by a ROC host to poll multiple field in a Modbus communications protocol environment Note that this programming example demonstrates the procedures for writing an FST and should in no way be construed as a functioning program without thorough testing and study to determine its suitability in the application In this example a Fisher Rosemount RS3 host communicates to a single ROC through an RS232 communications link using the Modbus communications protocol This ROC then acts as a Modbus Host that brings in data from four field ROCs The ROCs in the field use an FST to provide spontaneous report by exception SRBX and the host ROC uses two FSTs to control polling and SRBX response B 1 HOST ROC FUNCTION SEQUENCE TABLE 1 In the host ROC FST 1 controls FST 2 and determines the type of polling to be performed FST 1 also generates communications alarms Steps 0 to 4 set the default values in the FST 1 registers STEP LABEL CMD ARGUMENTI ARGUMENT2 001 SAV FST1 FST SEQ 1 R10 000 VAL 30 UC 002 MND 003 SAV FST1 FST SEQ 1 R3 004 GO POLL Step 5 reads the time since midnight and Step 6 saves the value to register 2 for reference Step 7 ini
3. The Hi Lo float scale values are also used as high and low deadband limits when Convert Code 49 through 56 is selected see Modbus Functions Configuration CONV Field 3 3 MODBUS FUNCTIONS CONFIGURATION The Modbus function parameters are set and edited with the Modbus function parameters display in the GV101 software configuration program Upon selection of a User Defined Function from the menu Figure 1 101 Configuration Software reads the Modbus Data Template and then displays the function parameters as shown in Figure For configuration the table template would display 0 for the values Interim Rev 7 98 3 5 Modbus Program User Manual The function configuration tables are used to associate Modbus register numbers with ROC point data When a Modbus request is received the Modbus user program searches the function configuration table for the Modbus function requested starting with the first table entry down to the last If a register Modbus Funct COMI 7 of 24 TAG ID FUNCT 3A Type 4 1 0 Type 1 0 Type 1 1 Type 1 1 11 0 0 9 2 3 4 5 6 7 8 9 1 0 oaaao 1 Update 2 Prev 3 Next 4 RD
4. ARGUMENTI 0 UC FST2 FST SEQ 2 R9 14 UC FST2 FST SEQ 2 R4 COM2 ROCS RCOUNT 2 5 VALRCV 2 UC FST2 FST SEQ 2 R2 128 UC 2 5 FST2 FST 8 2 R10 FST2 FST SEQ 2 R9 1 UC FST2 FST SEQ 2 R9 ARGUMENT2 B 7 Modbus Program User Manual 062 gt FST2 FST SEQ 2 R3 SEND5 063 VAL COM2 ROCS VALRCV 064 FST2 FST SEQ 2 R2 S4 Steps 65 through 81 work the same as SEND2 but are used for the fifth ROC After the last send routine the program will proceed to poll all the ROCs for an update STEP LABEL CMD ARGUMENTI ARGUMENT2 065 SENDS VAL 0 UC 066 SAV FST2 FST SEQ 2 R9 067 S5 VAL 26 068 SAV FST2 FST SEQ 2 84 069 SAV COM2 ROCS RCOUNT 070 VAL COM2 ROCS VALRCV 071 2 072 SAV FST2 FST SEQ 2 R2 073 VAL 128 UC 074 SAV COM2 ROCS 075 WT FST2 FST SEQ 2 R10 076 VAL FST2 FST SEQ 2 R9 077 i 1 078 SAV FST2 FST 8 2 R9 079 gt FST2 FST SEQ 2 R3 POLLO 080 VAL COM2 ROCS VALRCV 081 FST2 FST SEQ 2 R2 S5 Step 82 initiates a 15 second wait to allow the I O in the field to stabilize to new values before polling STEP LABEL CMD ARGUMENTI ARGUMENT2 082 POLLO WT 15 UC The poll routine is the same as the send routine except that a different request is sent Steps 83 through 99 provide the poll routine for the second ROC STEP LABEL CMD ARGUMENTI ARGUMENT2 083 POLL2 VAL 0 UC
5. Modbus Program User Manual Table C 1 Modem S Register Summary REGISTER FUNCTION rm Ring to Answer On Rings Ring Count ASCII Escape Code Character ASCII Carriage Return Character ASCII Line Feed Character ASCII Back Space Character Seconds Wait for Dial Tone Seconds Wait Time for Data Carrier Seconds Pause Time for Comma 1 10 sec Carrier Detect Response Time 1 10 sec Lost Carrier to Hang up Delay Millisec Dialing Speed 1 50 sec Escape Code Guard Time Reserved Bit Mapped Options Register Reserved Modem SelfTest Options Reserved Seconds Test Timer Reserved Reserved Bit Mapped Options Register Bit Mapped Options Register Bit Mapped Options Register Seconds Delay to DTR 1 100 sec RTS to CTS Delay Interval Bit Mapped Options Register Dial Originate Mode ready to dial Pulse Dial Originate Call in Answer Mode Touch Tone Dial Wait for Dial Tone Return to Idle State Wait for Quiet Answer Command Flash Hook Pause S8 Dial Digits Characters Hang up Reset Software 2 Rev 3 95 Modbus Program User Manual Table C 3 AT Command Set Summary BASIC COMMANDS OPTIONS FUNCTION UPPER CASE ONLY Attention Code Answer Commant UPPER CASE ONLY Repeat Last Command Communications Standard Option Squelch Transmitter Dial Command Off line Character Echo Option duplex Switch Hook Control Option Speaker Volume Option Speaker Control Option On line Command Pause Dial Result Code Display Option
6. Table A 22 Point Type 40 MVS 205 Sensor Parameters ssssssesseeeeeneeneenen Table A 23 Point 41 AGA Run Table A 24 Point Type 42 Extra AGA Run Parameters nennen nennen Table A 25 Point Type 43 User List Parameters Table 1 Modem S Register Table C 2 Dial Modifier Command Summary stccssaznacavedaadscaasatoddedenncassinanccansssoucenss Table C 3 AT Command Table 4 Ampersand Command Summary esses esee enne enne 3 Table 5 Result Code or Status Messages Summary Table D 1 ROC300 Series Communications Signals essere Table D 2 ROCA Communications Signals D 2 Table D 3 ROC to ROC Connections for Modem Cards 4 Wire 11 Table D 4 ROC to ROC Connections for EIA 232 Serial Table D 5 ROC to ROC Connections for EIA 422 Serial Table D 6 ROC to ROC Connections for EIA 485 Serial vi Rev 7 95 Modbus Program User Manual SECTION 1 GETTING STARTED 1 1 USER MANUAL OVERVIEW The Modbus Protocol Emulation Program is designed to allow the Remote Operations Controllers to emulate the communications protocol used by Modbus devices This makes it possible to integrate the ROC and Modbus devices into the same ho
7. 084 SAV FST2 FST 2 R9 085 P2 VAL 0 UC 086 SAV FST2 FST SEQ 2 R4 087 SAV COM2 ROCS RCOUNT 088 VAL 2 5 VALRCV 089 4 1 090 SAV FST2 FST SEQ 2 R2 091 VAL 128 UC 092 SAV COM2 ROCS 093 WT FST2 FST 5 2 R8 B 8 Rev 2 96 Modbus Program User Manual 094 VAL FST2 FST 5 2 R9 095 1 096 FST2 FST 5 2 R9 097 gt FST2 FST SEQ 2 R3 POLL3 098 VAL COM2 ROCS VALRCV 099 QFST2 FST SEQ 2 R2 2 Steps 100 through 116 work the same as the POLL2 routine but are used for the third ROC STEP LABEL CMD ARGUMENTI ARGUMENT2 100 POLL3 VAL 0 UC 101 SAV FST2 FST SEQ 2 R9 102 P3 VAL 2 UC 103 SAV FST2 FST SEQ 2 R4 104 SAV COM2 ROCS RCOUNT 105 VAL COM2 ROCS VALRCV 106 1 107 SAV FST2 FST SEQ 2 R2 108 VAL 128 UC 109 SAV COM2 ROCS MODE 110 WT FST2 FST SEQ 2 R8 111 VAL FST2 FST SEQ 2 R9 112 T 1 113 SAV FST2 FST SEQ 2 R9 114 gt FST2 FST SEQ 2 R3 POLL4 115 VAL G COM2 ROCS VALRCV 116 FST2 FST SEQ 2 R2 P3 Steps 117 through 134 work the same as the POLL2 routine but are used for the fourth ROC STEP LABEL CMD ARGUMENTI ARGUMENT2 117 POLL4 VAL 0 118 FST2 FST 5 2 R9 119 P4 VAL 4 UC 120 SAV FST2 FST SEQ 2 R4 121 SAV COM2 ROCS RCOUNT 122 VAL COM2 ROCS VALRCV 123 1 124 FST2 FST 5 2 R2 125 VAL 128 UC 126 SAV COM2 ROCS MODE
8. The address field immediately follows the beginning of the frame and consists of 8 bits These bits indicate the user assigned address of the slave device that 15 to receive the message sent by the master The Modbus protocol can support up to 255 remote units on a single communication system Address 0 is reserved for a broadcast message to all remote units in the ASCII mode Address 0 is not supported in RTU mode as a slave device Data Field The data field contains either information needed by the slave to perform the specified function or it contains data collected by the slave in response to a query All register coil address references in Modbus messages are numbered relative to 0 and are actually an offset from the beginning of the register coil area that can be referenced by the function specified in the message Error Check Field This field detects errors in transmission For the RTU mode the error check field uses a Cyclic Redundancy Check CRC 16 and requires two 16 bit bytes For the ASCII mode the error check field uses the Longitudinal Redundancy Check LRC method and requires two ASCII bytes Interim Rev 7 98 4 1 Modbus Program User Manual Function Code Field The Function Code is a single byte field that defines the action to be performed by the slave The high order bit of this field is set by the slave if an error is detected in the received message This bit should remain zero if the message is
9. To download the Modbus Protocol Emulation Program select the Utilities option from the Main Menu of the GV101 Configuration Software and then select the User Program Routines option Next select the Download User Programs option This utility allows you to load one or more user programs from a disk file into the ROC user memory Use the Check User Memory Allocation routine discussed in Section if you want to see what user programs are currently loaded Since the Modbus program has files that can be loaded selectively into various memory segments this may help you decide which program files to use When you un the utility a display appears for selecting the program files to be loaded This display see Figure 2 1 lists the names of all the files that have the H00 extension and are located in the default drive zd directory Use the up and down arrow keys to indicate the desired file in the list and then press ENTER If the desired file is not listed you can instead select a drive and directory that has the file you want Note that the current drive and directory are given at the top of the list Press ESC to cancel UP or DOWN to Search Press ENTER to select filename with HOO Select lt DIR gt for the parent directory USERPROG MB1COC8 H00 DIR A Drive B i Drive C Drive G Drive H Drive J Drive M Drive U Drive V Drive W Drive X Drive Drive 2
10. 0 the line in the configuration table is considered invalid and will be skipped when processing arequest The valid point types for the ROC are listed in Table in Appendix A Appendix A has a complete list of parameters for each of the ROC Point Types Lgl Field The logical number field specifies the logical number to be assigned to the start address If the range of addresses is greater than 0 the next address start address 1 corresponds to the value specified by logical number 1 This is called horizontal indexing of structures to specify data For example the configuration of Start 100 End Addr 106 Type3 Lgl 0 17 0 specifies seven values for parameter 17 of Analog Inputs starting at the first Analog Input LGL 0 So register 100 parameter 17 of AI 1 register 101 parameter 17 of AI 2 and register 106 parameter 17 of AI 47 Another example of horizontal indexing uses the configuration of Start 120 End Addr 120 Type 17 Lgl 14 Param 5 Conv 0 specifies one value for parameter 5 of a Soft Point starting at the fifteenth Soft Point Lgl 14 So register 120 parameter 5 of Soft Point 15 Interim Rev 7 98 3 7 Modbus Program User Manual Indexing of parameters can also be selected by offsetting the logical number by 128 This is called vertical indexing For example the configuration of Start 109 End Addr 114 Type 16 Lgl 128 Param2 Conv 1 specifies six parameters
11. Examples of retrieving historical data an address table and discrete output functions follow 4 4 4 Historical Data Storage Historical data is contained in Point Type 42 for ROC300 Series units with a ROCPAC or in Point Type 62 for the ROC407 and ROC300 Series units with a FlashPAC The ROC can store up to 35 days of hourly data for each of its history points The historical information is stored in 104 byte blocks of hourly values one for each daily record byte breakdown of the daily record 1 shown in Table S 4 10 Interim Rev 7 98 Modbus Program User Manual Table 4 17 History Data Data Description Data Byte Description Byte Valid check hour 0 7 48to 51 Hour 11 History Value Valid check hour 8 15 521055 Hour 12 History Value Valid check hour 16 23 56 to 59 Hour 13 History Value Not Used 60 to 63 Hour 14 History Value 4to7 Hour 0 History Value 12 00 to 1 00 a m 64to67 Hour 15 History Value 8 11 Hour1 History Value 68 to 71 Hour 16 History Value 12to 15 Hour2 History Value 72 75 Hour 17 History Value 16to 19 Hour3 History Value 76 79 Hour 18 History Value 20to23 Hour 4 History Value 80 to 83 Hour 19 History Value 24to 27 Hour 5 History Value 84 87 Hour 20 History Value 281031 Hour 6 History Value 88 91 Hour21 History Value 321035 Hour 7 History Value 921095 Hour 22 History Value 36to 39 Hour 8 History Value 96 to 99 Hour 23 History Value 40 to 43 Hour 9
12. Save 446 Save 0 Save 0 Save 0 Save 0 Regs 40 Regs 0 Regs 40 Regs 0 Regs 40 Regs 0 Regs 40 Regs 0 Regs 0 Regs 0 Status 8 Status 0 Status 0 Status 0 Status 8 Status 0 Status 8 Status 0 Status 0 Status 0 Status 8 Status 8 Status 0 Status 0 Status 1 Status 1 Status 0 Status 0 Status 0 Status 0 Modbus Program User Manual B 18 amp RTU Addr 0 RTU RTU Addr 0 Addr 3 RTU Addr 3 RTU Addr 0 RTU Addr 0 RTU Addr 5 RTU Addr 5 RTU Addr 0 RTU Addr 0 Modbus Host COMI 3 of 4 HOST 2029 Reg 0 Reg 0 341 Reg 346 Reg 0 0 Reg 541 Reg 546 Reg 0 0 Save 0 Save 0 Save 341 Save 346 Save 0 Save 0 Save 541 Save 546 Save 0 Save 0 Modbus Host COMI 4 of 4 HOST 3039 Reg 0 Reg 244 Reg 0 Reg 344 Reg 0 Reg 444 Reg 0 Reg 544 Reg 0 Reg 0 Save 0 Save 244 Save 0 Save 344 Save 0 Save 444 Save 0 Save 544 Save 0 Save 0 Status 0 Status 0 Status 1 Status 1 Status 0 Status 0 Status 2 Status 3 Status 0 Status 0 Status 0 Status 8 Status 0 Status 1 Status 0 Status 8 Status 0 Status 8 Status 0 Status 0 Rev 2 96 Modbus Program User Manual Modbus Config 1 of 1 ASCII 0 I Byte Order 1 MSB Ist Host Enable 1 Log Data 1 Yes Init Memory 1 Por
13. 1 Same as Convert Code 65 regardless of MSB Ist flag Convert Code 67 Reverses byte 0 and byte 1 order in register xxxxx reverses byte 2 and byte 3 order in register xxxxx 1 Register byte 1 byte 0 Register 1 byte 3 byte 2 Convert Code 68 Reverses byte 0 and byte 1 order in register xxxxx reverses byte 2 and byte 3 order in register xxxxx 1 Same as Convert Code 67 regardless of MSB Ist flag Convert Code 69 Places byte 2 and byte 3 in register xxxxx byte 0 and byte 1 are placed in register XXXXX Register byte 2 byte 3 Register xxxxx 1 byte 0 byte 1 Interim Rev 7 98 3 13 Modbus Program User Manual Convert Code 70 Places byte 2 and byte 3 in register xxxxx byte 0 and byte 1 are placed in register xxxxx 1 Same as Convert Code 69 regardless of MSB Ist flag Convert Code 71 Reverses byte 2 and byte 3 order in register xxxxx reverses byte 0 and byte 1 order in register xxxxx 1 Register xxxxx byte 3 byte 2 Register 1 byte 1 byte 0 Convert Code 72 Reverses byte 2 and byte 3 order in register xxxxx reverses byte 0 and byte 1 order in register xxxxx 1 Same as Convert Code 71 regardless of MSB Ist flag Convert Code 73 and 74 Convert Codes 73 and 74 send the IEEE formatted floating point number as four bytes with a single register request Only the byte order is changed These conversions are supported with Modbus function 6 Convert Code 73 Loa
14. 2 3 and 4 the host will be reading data from the slave and writing it to the host When using Modbus functions 5 6 15 and 16 the host will be reading data from the host and writing it to the slave Care must be given to insure that there are enough points in the host to support the points being written to or read from in the slaves Utilization of ROC soft point parameters unused I O module parameters and FST parameters may be required to store all of the necessary data There is a Modbus Host Configuration worksheet in Appendix E of this manual Modbus Host COM1 1 of 3 di 0 e C e ct ct ct ct ct ct ct ct c rz Tr xj 12 1 CO C XOU DO OC OQ WEGE Ge b al NNNNNNNNNN CO 00 O O S 0 SD 69 929 0 Ts Z4 3 4 Dis 6 Ta 8 95 1 Update 2 Prev 3 Next 4 RD Disk 5 WR Disk 6 Quit Figure 3 4 Modbus Host Configuration Display RTU Addr Specifies the address of the slave device Address 0 is used to broadcast a command to all devices connected to the port The address can be a number from 0 to 255 Interim Rev 7 98 3 15 Modbus Program User Manual Fnc Num
15. 2 R3 Steps 6 and 7 save the current receive counter value to FST2 register 2 Steps 8 to 11 read the value of FST2 register 1 written by FST1 and perform the type of poll requested Step 12 inserts a 5 second wait before rechecking register 1 and Step 13 returns the FST to the Start label STEP LABEL CMD ARGUMENTI ARGUMENT2 006 START VAL COM2 ROCS VALRCV 007 SAV FST2 FST SEQ 2 R2 008 VAL FST2 FST SEQ 2 R1 009 1 POLL2 010 2 SEND2 011 3 CLEAR2 012 WT 5 UC 013 GO START Steps 14 and15 reset the value of register 9 to 0 Steps 16 and 17 save the value of 10 to register 4 for reference and Step 18 sends the value to the valid receive counter to direct the Modbus program to the correct line in the Host Poll configuration Steps 19 to 21 read the value of the valid receive counter and add 2 to it This value is used for reference in Step 30 Steps 22 to 24 initiate a poll of the ROC and wait for number of seconds specified by register 10 Steps 25 to 27 increment the value in register 9 by 1 to set the number of polls If the poll counter value in register 9 is greater than the retry value in register 3 the program moves to the next ROC 1 will generate a comm failure alarm In Steps 29 and 30 the current value of the comm receive counter is compared with the reference value in register 9 If the values are equal the program moves to the next ROC if they are not equal the poll i
16. 2 R4 099 VAL SEQ 1 MISC4 100 1 101 SAV G FSTI FST SEQ 1 MISC4 102 SAV SEQ 1 R7 103 LOOP VAL FST2 FST SEQ 2 61 104 0 UC START 105 VAL SEQ 1 R8 106 FST2 FST SEQ 2 R4 LOOP 107 VAL FST2 FST SEQ 2 RI 108 3 UC JMPC 109 1 JMPU 110 2 JMPS 111 GO START 112 END 113 114 This ends the steps for the Host FSTI Figure shows a display of the FST1 registers screen B 4 Rev 2 96 Modbus Program User Manual Rev 2 96 Point Tag Id Result Register 1 Register 1 Register 2 Register 3 Register 4 Register 5 Register 6 Register 7 Register 8 Register 9 Register 10 Timer 1 Timer 2 FST Registers 1 of 4 FST SEQ 1 000000 0000000 1103 000 1103 000 0000000 4 000000 1 000000 12 00000 6 000000 0000000 30 00000 0 0 Timer 3 Timer 4 Message 71 Message 72 Miscellaneous Miscellaneous Miscellaneous Miscellaneous Compare Flg SVD Run Flag Code Size Instruct n Ptr Exec n Delay Figure B 1 FSTI Registers Display B 5 Modbus Program User Manual 2 HOST ROC FUNCTION SEQUENCE TABLE 2 Steps 0 to 5 load default values in the FST2 registers Registers 10 and 8 are polling delays in seconds and register 3 is the number of retries STEP LABEL CMD ARGUMENTI ARGUMENT2 000 VAL 5 UC 001 SAV FST2 FST SEQ 2 R10 002 VAL 10 UC 003 SAV FST2 FST SEQ 2 R8 004 VAL 3 UC 005 SAV FST2 FST SEQ
17. 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 Interim Rev 7 98 Modbus Program User Manual 4 Table 3 Point Type 0 Configurable Opcode continued Data Type Data 39 Data 40 3 Data 41 Data 42 Data 43 Data 44 Table 4 Point Type 1 Discrete Input Parameters Data Type 10 1 1 1 1 4 4 4 2 2 2 10 2 4 4 4 4 4 4 4 4 4 2 Point Tag Id Filter Status Mode Alarm Code Accumulated Value On Counter Off Counter 0 Count 100 Count Max Sample Time Units Scan Period Low Reading EU High Reading EU Low Alarm EU High Alarm EU Lo Lo Alarm EU Hi Hi Alarm EU Rate Alarm EU Alarm Deadband EU Value TDI Count Interim Rev 7 98 Modbus Program User Manual Interim Rev 7 98 1 2 3 4 5 6 7 8 Table 5 Point 2 Discrete Output Parameters Data Type BRANNNGSPRPEENGS Point Tag Id Time On Not used Status Mode Alarm Code Accumulated Value Units Cycle Time 0 Count 100 Count Low Reading EU High Reading EU EU Value Table A 6 Point Type 3 Analog Input Parameters Data Type Point Tag Id Units Scan Period Filter Adjusted A D 0 Adjusted A D 100 Low Reading EU High Reading EU Low Alarm EU High Alarm EU Lo Lo Alarm EU Hi Hi Alarm EU Rate Alarm EU Alarm Deadband Filtered EUs Mode Alarm Code Raw A D Input Actual Scan Time Modbus Program U
18. 7 98 3 3 Modbus Program User Manual The first Discrete Input is used to switch protocols When inactive 0 the Modbus Protocol is used Normally used when an external event triggers a need to switch protocols 2 The Integer Flag in the first Soft Point is used to switch protocols When the value in the Integer Flag is zero the Modbus protocol is used Normally used when control of the port is determined by an FST application program Modbus Baud Rate The baud rate entered in this field is only used for the Modbus protocol when the Port Switch En 1 field is set to 1 If the Port Switch En field is set to 0 the baud rate 15 determined by the Communication parameters Only used when a port switch is enabled Switch Baud Rate The baud rate entered in this field 1s only used for the ROC protocol when the Port Switch En 1 field is set to 1 If the Switch En 1 field is set to 0 the baud rate is determined by the Communication parameters Only used when a port switch is enabled Input Data Start Output Data Start HI Integer Scale LOW Integer Scale These four parameters make up the Modbus Address Table Some Modbus hosts might request from the ROC the Address Table for configuration of the host Normally during initialization the host reads the Address Table to determine where the Input and Output data tables are located and to determine the 10096 and 0 values for all anal
19. Example Message Message Device Functio Value Quantity Byte Data Error Field Address n Code Offset Count Check 2 1 1 3 1 Byte Cnt MS LS MS LS LS MS 01H 10H 1BH 59H 00H 04H 0000C842 CRC 16 Table 4 14 Function Code 16 ROC Response Example Message Message Device Function Value Offset Quantity Error Field Address Code Check 1 1 2 2 MS LS MS LS LS MS 01H 10H IBH 59H 00H OIH CRC 16 4 3 7 X Exception Response The Exception Response message Table 4 15 is transmitted if the ROC detects an error in the received message The received function code is returned with the most significant bit set to signify an error The exception codes listed in Table are for reference only Although these are the codes specified in the Modbus protocol some vendors use a subset of these codes or a completely different set of codes Table 4 15 ROC Exception Response Example Message Message Field Device Function Code Exception Error Check Address Code Bytes 1 1 1 2 LS MS Value As Received FC 80H 1 to3 CRC 16 Interim Rev 7 98 4 9 Modbus Program User Manual Table 4 16 Modbus Protocol Errors that Elicit an Exception Response Message 01 Illegal function code Implemented 02 Illegal Data Address Implemented 03 Illegal Data Value Implemented 4 4 SPECIAL FUNCTIONS Special functions or extensions to Modbus are implemented using Function Code 03 Function Code 04 and Function Code 16
20. History Value 100 to 103 Daily Total or Daily 44 to 47 Hour 10 History Value Average History Value Data bytes 0 1 and 2 are data Valid check bytes The Valid check bytes provide a flag that denotes if the data for certain hour is valid If a bit is set 1 the data is valid Ifa bit is clear 0 either the data is corrupt or not in the database The bit designations are Data Byte 0 Bit 7 6 5 4 3 2 Hour 7 6 5 4 3 2 1 0 Data Byte 1 Bit 7 6 5 4 3 2 1 0 Hou 15 14 13 12 11 10 9 8 Data Byte 2 Bit 7 6 5 4 3 2 1 O0 Hour 23 22 21 20 19 18 17 16 Interim Rev 7 98 4 11 Modbus Program User Manual Due to limitations imposed by available memory in a ROC300 Series controller only 11 history points can be configured for 35 days of hourly values in base RAM The user is allowed to configure up to 30 history points in base RAM but a reduction in number of days of stored values takes place when more than 11 points are configured RAM areas 1 and 2 each allow a maximum of 30 points with 35 days of hourly values to be stored Table shows the history point numbers for each area of database RAM Table 4 18 History Point Numbers for Database RAM Base RAM 0 to 29 RAMI 30 to 59 RAM2 60 to 89 The 407 allows the use of 30 database points in the base RAM area and 20 database points in RAM area 1 for a total of 50 database points The 407 places no restrictions on the number of days of hourly value
21. L5 LL xx rx xm er pm ose COMMUNICATIONS CARDS Ent ere Tb COM Only mro o Tose we em _ DTR COM EIA 422 485 CARD 422 Usage EIA 422 485 CARD OUT OUT 485 a RADIOMODEM TXA COM LEASED LINE MODEM Port RINGI TIP1 4 wire Private Line DIAL UP MODEM RJ 11 Port LEASED LINE MODEM RJ 11 Port nem 2 Wire Operation LEASED LINE TIP2 1 MODEM RJ 11 Port BLK RED 4 Wire Operation DIAL UP MODEM Port output only for analyzer pm atm ING GR Signal is permanently enabled true Signal present only on LED equipped version of card D 2 Table D 3 ROC to ROC Connections for Modem Cards 4 Wire RJ 11 Ring2 Yel Ringl Grn Table D 4 ROC to ROC Connections for EIA 232 Serial Cards Rev 5 97 Modbus Program User Manual Table D 5 ROC to ROC Connections for EIA 422 Serial Cards Rev 5 97 D 3 Modbus Program User Manual This page is intentionally blank D 4 Rev 5 97 Modbus Program User Manual APPENDIX E CONFIGURATION WORKSHEETS The Modbus Function and Host Configuration worksheets are provided to assist the user in configuring the Modbus program Make copies as needed Rev 7 95 E 1 Modbus Program User Manual E 2 Rev 7 95 Modbus Host Configuration Worksheet RTU Address Function Slave Regis
22. Miscellaneous Miscellaneous Miscellaneous Compare Flg SVD Run Flag Register 9 Register 10 Timer 1 Timer 2 ROC Address 1 ROC Group 2 Station Name Active PID s 0 Active AGA s 0 Active TANK s Base DB Pt s DB Pt s DB Pt s Not Used Contract Hour Rev 2 96 RS3 field link 2 000000 10 00000 Code Size Instruct n Ptr 0 Exec n Delay 0 System Variables 1 of 1 Version Name Fisher ID Time Created ROM Serial Customer Name Max PID s Max AGA s Max TANK s FST Active RAM Installed ROM Installed MPU Loading Utilities W68013X0082 Ver 1 61 Fisher NETREX Systems Sep 09 13 27 04 1993 None FISHER ROC300 16 5 8 1 01101001 10000000 36 54932 00011101 Modbus Program User Manual Modbus Config COMI 1 of 1 ASCII 0 1 Byte Order 1 MSB Ist Host Enable 1 Log Data 1 Yes HI Float Scale 2 LO Float Scale 2 HI Float Scale 3 0000000 0000000 0000000 LO Float Scale 3 HI Float Scale 4 LO Float Scale 4 HI Float Scale 5 LO Float Scale 5 HI Float Scale 6 LO Float Scale 6 HI Float Scale 7 LO Float Scale 7 HI Float Scale 8 LO Float Scale 8 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 Init Memory 1 Port Switch En 1 DCD 0 DI 1 SPT 2 0 Modbus Baud Rate 1200 Switch Baud Rate 1200 Input Data Start 100 Output Data Start 300 HI Integer Scale 32676 LOW Integer Scale 0 HI Float S
23. Param 0 B 21 Modbus Program User Manual 3 FIELD ROC FUNCTION SEQUENCE TABLE 1 Steps 0 and 1 load default values in the FST registers upon startup The value of 245 placed in register 10 is the time in seconds that the program will wait between SRBX attempts This value is 240 4 minutes plus the ROC address times 5 This provides an offset to prevent collisions if two ROCs should perform an SRBX at the same time STEP LABEL CMD ARGUMENTI ARGUMENT2 000 VAL 245 UC 001 SAV SEQ 1 R10 Step 2 provides a delay to reduce MCU loading Steps 3 and 4 check the MISCI flag to see if an SRBX is still pending If so a message is sent Step 5 writes ACK to FST message register 1 if there is no SRBX pending Steps 6 through 31 compare several values with reference values to see if there has been a change If there has been a change an SRBX alert is sent to the Host Step 32 returns the program to the Start label STEP LABEL CMD ARGUMENTI ARGUMENT2 002 START WT 5 UC 003 VAL SEQ 1 MISC1 004 1 SRBX 005 MSG ACK FST1 FST SEQ 1 MSGI 006 VAL IOA2 PT 408K ALARM 007 SFP1 Soft Pt 1 SRBX 008 VAL IOA4 XIT 405K 009 SFP2 Soft Pt 2 SRBX 010 VAL GIOAS TT 407K ALARM 011 SFP3 Soft SRBX 012 VAL IOA6 PT 402K ALARM 013 SFP4 Soft Pt 4 SRBX 014 VAL IOA7 AT 409K ALARM 015 SFP5 Sof
24. Program User Manual Table of Contents SECTION 1 GETTING STAR TIED Li USERMANUAL OVERVIEW 1 2 Scope f This DICUNT Rm 1 3 Organization of This 1 1 4 Modbus Protocol Emulation Program overview 1 4 1 M dbu 1 3 1 5 Versions and 1 6 Editor EU Emm ERU 1 5 SECTION 2 PROGRAM INSTALLATION 2 1 preparing to DOWNLOAD THE PROGRAM 22 Download procedure for Gy 101 version 1 too vio s eH Ch 2 1 224 Clear User Enable Flag pot Un b UE NERO EN 2 2 222 Download Utility qn 2 2 22 3 Initializing and Starting The Modbus Emulation Program sss 2 3 2 3 Download procedure for 101 version 1 51 and later 2 4 2 4 procedure for downloading to flash b 6 SECTION 3 MODBUS CONFIGURATION __ ACCESS 2x M odb s Config ration patam t tS 2 3 3 Modbus Functions Configuration sss eee enne enne 3 4 Modbus Convert code descriptions 5s GMODBUSHOST a AIL JModbus Host Confie ratiot 3 15 3 6 Modbus host Communication Parameters 2 Modbus Dial p Operation sessio es ep uui c 3 20 39 Controlling Modbus Host b
25. Specifies the Modbus function to be sent to the slave device The valid function numbers are Function 1 Send data to host logic coils Function 2 Send data to host discrete inputs Function 3 Send data to host holding registers Function 4 Send data to host input registers Function 5 Seta single coil in slave device Function 6 Seta single register in slave device Function 15 Set multiplecoils in slave device Function 16 Set multiple registers in slave device A function number of 0 disables this request command Any other function number not described above results in an error Status 145 and aborts the request Reg A number that represents the starting Data Register for this request in the slave device Save A number that represents the starting Data Register for this request in the host The Save Register number must be present in the Modbus Functions table for the entered Function Number on the same Comm port This register tells the host where to put the data when it is received or where to get the data for an output command This register number does not need to be the same as the device register number Reg Regs Specifies the number of registers for the host to request or set The Modbus Functions table for the specified Function Number Fnc Num must be sized the same as or greater than the ZRegs field Status Displays the status of the host request or command Table B 2 lists the possi
26. Type 13 System Flag Parameters CRC Check DI PI for ROC306 312 User LCD Enable User Operator Port Enable FST Display Clear User Coml Enable U U Com2 Enable Jser Program Enable RTS Operator Interface Port RTS Communications Port 1 RTS Communications Port 2 Clear EEPROM I O Scan Enable Auxiliary Output 2 On Auxiliary Output 1 On Cold Hard Start Warm Start Read Write to EEPROM EEPROM Write Complete 1 2 3 4 5 6 7 8 C Cocuc CU CC ce OQO0000000000000000000 Table A 16 Point Type 14 Communication Port Parameters Tag Id Baud Rate Stop Bits Data Bits Parity Status Mode Key On Delay Key Off Delay Retry Count Retry Time Alarm Pointer Recv Counter Copy Retry Counter Valid Receive Counter tn gt 10 2 1 1 1 1 1 1 1 1 2 2 2 2 2 12 Interim Rev 7 98 Modbus Program User Manual Table A 17 Point Type 15 System Variables ROC Address ROC Group Station Name Active PIDs Active AGAs Active Tanks Base Database Points History 1 RAMI Database Points History 2 Database Points History 3 Force End of Day Contract Hour Version Name Fisher ID Time Created ROM Serial Number Customer Name Maximum PIDs Maximum AGAs Maximum Tanks FSTs Active RAM Installed ROM Installed MPU Loading Utilities Interim Rev 7 98 A 13 Modbus Program User Manual Tab
27. delay period is completed On the ROC300 Series only if a Turnaround Delay greater than or equal to 128 is entered an extra character will be transmitted and the RTS signal will be turned off in the middle of the extra character The extra character will be a LF hex 0A if using ASCII mode and a NULL hex 00 if using the RTU mode If the entered value is greater than 128 it will be reset to 128 by the Modbus user program When using the following communication cards a Turnaround Delay of 128 for the ROC300 Series and 2 for the ROC407 should be used rather than 0 to ensure proper control of the RTS signal so that improper termination of the message is avoided EIA 422 485 Serial Communications Card Radio Modem Communications Card Leased Private Line Communications Card 3 18 Interim Rev 7 98 Modbus Program User Manual Each of the above listed communications cards uses the RTS signal internally to enable its transmit circuitry If a Turnaround Delay of 0 is used the RTS signal will be deactivated during the last byte and the communicating device at the other end will receive an incomplete message Therefore a Turnaround Delay value of 128 is recommended so that the extra character is incomplete but a valid message is still received When the RTS signal is turned off the receiver on the communication card is turned on When using the following communications cards a Turnaround Delay of 0
28. is cleared and then to see if any changes have occurred STEP LABEL CMD ARGUMENTI ARGUMENT2 033 SRBX VAL 1 UC 034 SAV FSTI FST SEQ L MISCI 035 MSG SRBX FST1 FST SEQ 1 MSG1 036 VAL 0 UC 037 SAV COM2 Comm 1 RCOUNT 038 VAL 128 UC 039 SAV COM2 Comm 1 MODE 040 VAL IOA2 PT 408K ALARM 041 SAV SFP1 Soft Pt 042 VAL IOA4 XIT 405K 043 SAV SFP2 Soft Pt 2 044 VAL IOAS TT 407K ALARM 045 SAV SFP3 Soft 046 VAL IOA6 PT 402K ALARM 047 SAV SFP4 Soft Pt 4 048 VAL GIOA7 AT 409K ALARM 049 SAV SFPS Soft Pt 5 050 VAL IOA8 AT 410K ALARM 051 SAV SFP6 Soft Pt 6 052 VAL IOA9 AT 411K ALARM 053 SAV SFP7 Soft Pt 7 054 VAL IOA10 AT 010K ALARM 055 SAV SFP8 Soft Pt 056 VAL amp IOA1LAT 011K ALARM 057 SAV SFP9 Soft Pt 9 INTI 058 VAL IOB3 ZSC 404K STATUS 059 SAV SFP10 Soft Pt 10 INT1 060 VAL IOB4 ZSC 406K STATUS 061 SAV SFP11 Soft Pt 11 INT1 062 VAL IOB5 XS 412K STATUS 063 SAV SFP12 Soft Pt 12 INT1 064 VAL IOA13 XY 404K STATUS 065 SAV SFP13 Soft Pt 13 INTI 066 WT 10 UC 067 VAL 0 UC 068 SAV COM2 Comm 1 MODE 069 WT SEQ 1 R10 Rev 2 96 23 Modbus Program User Manual 070 WT 071 END 072 45 UC The following illustrations pages B 24 through B 27 are screen representations of various GV101 configuration parameters used in
29. is recommended EIA 232 Serial Communications Card Dial up Modem Communications Card To achieve the fastest polling cycles a Turnaround Delay of 0 or 128 should be used based on what the connected host or slave at the other end is capable of Some Modbus hosts or slaves will not tolerate an extra character and some will The Turnaround Delay should be chosen accordingly Retry Count This specifies the request number 0 to 39 as configured in the Modbus host Configuration To begin with request number 0 indicates the first host request 1 indicates the second host request and 39 indicates the fortieth last host request Each request from this number on will be sent until a request is encountered that has a function number of 0 Retry Time This specifies the amount of time in addition to the normal 500 millisecond interval to wait between groups of transmissions in 100 millisecond intervals This parameter is only used if Mode Bit 6 is set to 1 Alarm Pointer A pointer to the last alarm in the alarm log that triggers a report by exception RBX message informational only Recv Ctr Copy The receive counter copy checks the activity of the receive buffer before transmitting an RBX sequence informational only Retry Counter The retry counter logs the number of retries in an RBX sequence informational only Valid Rx Ctr The valid receive counter logs the number of valid Mod
30. is used in the data table If more discrete inputs are needed configure another line in Interim Rev 7 98 3 11 Modbus Program User Manual the configuration table with the Lgl Logical Number configured to point to the remaining discrete inputs If less than 16 discrete inputs are configured in the system the unused bits in the 16 bit word are set to 0 The first bit bit 0 corresponds to the specified logical number bit 1 Lgl 1 bit 2 Lgl 2 and so on Convert Code 38 Packed Discrete Output Values The Packed Discrete Output Values assigns the bits of a transmitted 16 bit word integer to the status value of discrete outputs A maximum of 16 discrete outputs can be configured per line in the configuration table The Start and End Addresses must be the same since only one address is used in the data table If more discrete outputs are needed configure another line in the configuration table with the Lgl Logical Number configured to point to the remaining discrete outputs If less than 16 discrete inputs are configured in the system the Convert Code only uses as many bits as needed The first bit bit 0 corresponds to the specified logical number bit 1 Lgl 1 bit 2 Lgl 2 and so on Convert Code 39 Float to Integer No Scaling The Float to Integer conversion changes a ROC floating point data type to an integer for transmission to the host Convert Code 40 Integer to Float No Scaling The Integer to Floa
31. menu When prompted during the download procedure specify the drive and directory that contains the Modbus program files and press ENTER The GV101 software then displays all files in the specified drive and directory with the H00 extension Select the desired Modbus program by entering the corresponding number After you verify your selection the downloading process is started and information similar to the following 1 displayed Downloading File a MB1C0C8 H00 Data Sent nnnnn Segment nnnn Offset nnnn Bytes nnn When the file has been downloaded to RAM the following message 1 displayed Download Complete Press ENTER to Configure Flags Esc to Quit Enter to continue 2 2 Interim Rev 7 98 Modbus Program User Manual Press ESC to return to the User Routines menu without running the Modbus program Pressing ENTER automatically brings up the ROC Flags display that allows you to set the needed User Enable flags for the Modbus program 2 2 3 Initializing and Starting The Modbus Emulation Program Before the Modbus Protocol Emulation Program as well as any previously loaded user programs can be run the User Enable flag associated with the loaded program must be set Enable the Modbus program by setting the User Enable flag User OP Port Enable User Coml Enable or User Com2 Enable to 1 If there are other programs that you want to run likewise enable the flags for them Remember to perform a Save operation
32. other Modbus devices Appendix B provides example FST control schemes 3 22 Interim Rev 7 98 Modbus Program User Manual SECTION 4 MODBUS MESSAGE FORMAT This section explains the message formats used in Modbus host slave communications the modes of data transmission and examples of typical transmit and receive messages for the Modbus protocol functions supported by the ROC 4 1 MODES OF TRANSMISSION Two modes of transmission are available for use in a Modbus system Both modes provide the same capabilities for communicating with the Modbus host and are selected depending upon the equipment used as the Modbus host devices in the same communication network must be configured with the same mode of transmission The two modes of transmission are ASCII and RTU In the ASCII mode each character is divided into two 4 bit parts that are represented by their hexadecimal equivalent In the RTU mode data is sent in 8 bit binary characters The ASCII mode uses twice as many characters as the RTU mode 4 2 MODBUS MESSAGE CONTENTS The Modbus message consists of the device address function code data error check and end of frame In the ASCII transmission mode the message is sent as ASCII characters representing the hexadecimal characters used to construct the message The RTU transmission mode sends the message as a continuous 8 bit binary character stream The following paragraphs define the message fields Device Address Field
33. status of User Enable flags Make sure the Modbus program will run by setting the associated User Enable flag in the ROC Flags display User 1 Enable or User Com2 Enable to 1 If there are other programs that you want to run likewise ensure that the associated flags are enabled for them To begin execution of the Modbus program as well as any other user programs loaded into the ROC a Warm Start should be performed To do this set the Warm Start flag in the ROC Flags display to 1 I O scanning is temporarily suspended during the Warm Start but the I O retains its last state Remember to perform a Save operation to transmit the changed flag values to the ROC407 2 8 Interim Rev 7 98 Modbus Program User Manual SECTION 3 MODBUS CONFIGURATION The Modbus Protocol Emulation Program functions are configured using the GV101 or ROCLINK configuration software The Modbus configuration information resides in the Modbus user program that is downloaded to the ROC User Defined Points UDP are used to make this data available to the configuration software The Modbus program for COMI port reserves UDP 32 UDP 34 UDP 35 and UDP 36 for configuration data The program for COM2 and the Operator Interface port reserves UDP 33 UDP 37 UDP 38 and UDP 39 for configuration data Do not run Modbus on the Operator Interface port and 2 at the same time in the ROC364 If you re using the ROCLINK Configuration Software to configure Mo
34. 00 ROCPAC Comm 1 C0000 C7FFF C8000 CBFFF MB2B8A8 H00 ROC300 ROCPAC Comm 2 B8000 BFFFF A8000 ABFFF MB2DOD8 H00 ROC300 ROCPAC Comm 2 D0000 D7FFF D8000 DBFFF FPMBO ROC300 FlashPAC C0000 C7FFF A4000 A7FFF FPMB1 C8 H00 ROC300 FlashPAC Comm 1 C8000 CFFFF ACOOO0 AFFFF FPMB2 ROC300 FlashPAC Comm 2 C0000 C7FFF A4000 A7FFF FPMB1 D8 H00 ROC300 FlashPAC Comm 1 D8000 DFFFF B4000 B7FFF FBMB1 60 H00 407 FloBoss Comm 1 60000 67FFF 68000 6BFFF FBMB1 A0 H00 407 FloBoss Comm 1 A0000 A7FFF 6C000 6FFFF FBMB1 05 H00 ROC407 v1 05 Comm 1 A0000 A7FFF 6C000 6FFFF FBMB2 70 H00 ROC407 FloBoss Comm 2 70000 77FFF 78000 7BFFF FBMB2 A8 HOQ 407 FloBoss Comm 2 A8000 AFFFF 7C000 7FFFF 2 05 H00 ROC407 v1 05 Comm 2 A8000 AFFFF 7C000 7FFFF 2 0570 H00 ROC407 V1 05 Comm 2 70000 77FFF 78000 7BFFF FBCLR ROC407 FloBoss A0000 A3FFF FBCLR A8 H00 407 FloBoss A8000 ABFFF This program file is intended for a FloBoss 407 with firmware version 1 05 or greater The file will load into earlier firmware versions but will not run 1 4 Rev 2 02 Modbus Program User Manual If you re using ROCLINK Configuration Software refer to the User Programs procedure in either the ROCLINK User Manual for DOS Form A6051 or ROCLINK for Windows User Manual Form A6091 If you re using the GV101 Configuration Software to view the memory allocation in a ROC select Utilities From the ROC Utilities M
35. 062 SAV SFP21 Soft Pt 21 DATA16 063 VAL SFP2 Soft Pt 2 DATA16 064 SAV SFP22 Soft Pt 22 DATA16 065 VAL 2 UC 066 SAV FST2 FST SEQ 2 R1 Steps 67 through 72 monitor the polling responses from FST2 If a ROC fails to respond for the number of retries in FST2 register 3 an event is placed in the ROC by the event routine In Steps 69 and 70 if polling is complete as indicated by a 0 in FST2 register 1 FST1 returns to Start STEP LABEL CMD ARGUMENTI ARGUMENT2 067 JMPS VAL FST2 FST SEQ 2 R9 R9 068 FST2 FST SEQ 2 R3 EVENT 069 VAL FST2 FST SEQ 2 R1 RI 070 0 UC START 071 WT 2 UC 072 GO JMPS Steps 73 and 74 place a 1 in FST2 register 1 in order to initiate a standard poll The current MND is placed in register 3 and will be used as a reference for the next polling time with Steps 75 and 76 Ifa failed poll response occurs Steps 78 and 79 the program 1 sent to the Event label After polling 15 complete Steps 80 and 81 the MISCI flag is checked if equal to 0 the program goes to Start if equal to 1 then 3 1 placed in FST2 register 1 to initiate a poll to clear all SRBX flags set to 0 STEP LABEL CMD ARGUMENTI ARGUMENT2 073 POLL VAL 1 UC 074 SAV FST2 FST SEQ 2 R1 075 MND 076 SAV FST1 FST SEQ 1 R3 077 JMPU WT 2 UC 078 VAL FST2 FST SEQ 2 079 FST2 FST SEQ 2 83 EVENT 080 VAL FST2 FST SEQ 2 R1 081 0 UC JMPU 082 VAL G FSTI FST SEQ 1 MISC1 083 1 CLEAR 084 GO
36. 1 If you have 7 Pulse Inputs the valid logical numbers are 0 6 and 128 134 Param Field This field specifies the parameter of the Point Types Be aware of the different data types Character Integer Long Float and the size of the data types See Appendix A for the complete list of the ROC Point Types and Parameters Conv Field The convert field specifies the type of conversion required if any on the data before it is sent to the host or before it is written to the ROC The conversions are used to allow integer values to be transmitted and received instead of floating point values Table 3 1 lists the Convert Codes used with the Modbus Protocol Emulation program 34 MODBUS CONVERT CODE DESCRIPTIONS 3 8 Interim Rev 7 98 Modbus Program User Manual The paragraphs following Table describe the functions of the Modbus Convert Codes which are applied by the Conv field in the Modbus Function Configuration display Table 3 1 Modbus Function Convert Codes Convert Code Description Slave Host No Conversion Float to integer Float Scale 1 Float to integer Float Scale 2 Float to integer Float Scale 3 Float to integer Float Scale 4 Float to integer Float Scale 5 Float to integer Float Scale 6 Float to integer Float Scale 7 Float to integer Float Scale 8 No Conversion Integer to Float Float Scale 1 Integer to Float Float Scale 2 Integer to Float Float Scale 3 Integer to Float Float Scale 4 Integer to Float Float Scal
37. 1 Start 242 Start 244 Start 246 Start 341 Start 342 Start 344 Start 346 Start 441 Start 442 Modbus Funct 2 4 of 14 End Addr 439 End Addr 440 End Addr 517 End Addr 534 End Addr 539 End Addr 540 End Addr 0 End Addr 0 End Addr 0 End Addr 0 Modbus Funct COM2 12 of 14 TAG ID FUNCT 3B Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 0 Type 0 Type 0 Type 0 Lgl 0 Lgl 2 Lgl 0 Lgl 0 Lgl 0 Lgl 3 Lgl 0 Lgl 0 Lgl 0 Lgl 17 TAG ID FUNCT 16A End Addr 241 End Addr 243 End Addr 245 End Addr 246 End Addr 341 End Addr 343 End Addr 345 End Addr 346 End Addr 441 End Addr 443 Type 17 Type 17 Type 16 Type 17 Type 17 Type 17 Type 16 Type 17 Type 17 Type 17 Lgl 10 Lgl 0 Lgl 128 Lgl 128 Lgl 11 Lgl 0 Lgl 128 Lgl 29 Lgl 12 Lgl 0 Param 10 Param 1 Param 11 Param 12 Param 13 Param 1 Param 0 Param 0 Param 0 Param 0 Param 1 Param 15 Param 19 Param 1 Param 1 Param 16 Param 19 Param 1 Param 1 Param 17 Rev 2 96 Modbus Program User Manual Rev 2 96 Start 444 Start 446 Start 541 Start 542 Start 544 Start 546 Start 0 Modbus Funct 13 of 14 End Addr 445 End Addr 446 End Addr 541 End Addr 543 End Addr 545 End Addr 546 End Addr 0 TAG ID FUNCT 16B Type 16 Type 17 Type 17 Type 17 Type 16 Type 17 Type 0 Lgl 128 Lgl 20 Lgl 13 Lgl 0 Lgl 128 Lgl 31 Lgl 0 Param 19 Param 1 Param 1 Param 18 Param 19 Param 1
38. 127 WT FST2 FST 5 2 R8 128 VAL FST2 FST SEQ 2 R9 129 1 130 FST2 FST 5 2 R9 131 gt FST2 FST SEQ 2 R3 POLLS 132 VAL COM2 ROCS VALRCV 133 WT 5 UC 134 FST2 FST SEQ 2 R2 P4 Rev 2 96 B 9 Modbus Program User Manual Steps 135 through 152 work the same as POLL2 but are used for the fifth ROC Step 152 sends the program to the Reset routine after all the ROCs have been polled STEP LABEL 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 POLLS P5 CMD VAL SAV VAL SAV SAV VAL SAV VAL SAV WT VAL SAV VAL GO ARGUMENTI 0 UC FST2 FST SEQ 2 R9 6 UC FST2 FST SEQ 2 R4 COM2 ROCS RCOUNT 2 5 VALRCV 1 FST2 FST SEQ 2 R2 128 UC COM2 ROCS FST2 FST SEQ 2 R8 FST2 FST SEQ 2 R9 1 FST2 FST SEQ 2 R9 FST2 FST SEQ 2 R3 COM2 ROCS VALRCV FST2 FST SEQ 2 R2 RESET ARGUMENT2 RESET P5 The Clear routine 1 the same as the Send routine except that a different request 1 sent Steps 153 through 169 provide the Clear routine for the second ROC STEP LABEL 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 CLEAR2 CL2 CMD VAL SAV VAL SAV SAV VAL SAV VAL SAV WT VAL SAV VAL ARGUMENTI 0 UC FST2 FST SEQ 2 R9 31 UC FST2 FST SEQ 2 R4 COM2 ROCS RCOUNT 2 5 VALRCV 1 UC FST2 F
39. 437 End Addr 438 End Addr 439 End Addr 440 1 Start 0 End Addr 0 Type 17 Type 10 Type 10 Type 10 Type 0 Lgl 0 Param 17 Lgl 0 Param 1 Lgl 0 Param 6 Lgl 0 Param 3 Lgl 0 Param 5 Lgl 0 Param 7 Lgl 0 Param 2 Lgl 0 Param 0 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 B 25 Modbus Program User Manual Modbus Funct COMI 6 of 14 TAG ID FUNCT 4A End Addr 27 Type 16 Lgl 0 Param 0 End Addr 0 Type 0 Lgl 0 Param 0 Modbus Funct COMI 10 of 14 TAG ID FUNCT 6 Start 0 End Addr 27 Type 16 Lgl 0 Param 0 Start 0 End Addr 0 Type 0 Lgl 0 Param 0 Modbus Funct COMI 12 of 14 TAG ID FUNCT 16A Start 441 End Addr 441 Type 2 Lgl 0 Param 3 Start 442 End Addr 443 Type 4 Lgl 0 Param 6 Start 444 End Addr 444 Type 16 Lgl 0 Param 19 Start 445 End Addr 445 Type 15 Lgl 0 Param 0 Start 446 End Addr 446 Type 17 Lgl 31 Param 1 Start 0 End Addr 0 Type 0 Lgl 0 Param 0 B 26 Rev 2 96 Modbus Program User Manual Modbus Host COMI 1 of 4 HOST 09 RTU Addr 1 Fnc Num 16 Reg 444 Save 444 Regs 2 Status 8 RTU Addr 0 Fnc Num 0 Reg 0 Save 0 Regs 0 Status 0 Rev 2 96 B 27 Modbus Program User Manual This page is intentionally blank B 28 Rev 2 96 Modbus Program User Manual APPENDIX C MODEM REFERENCE Tables through 5 provide a reference for the AT command set used to set up modem The mo
40. Disk 5 WR Disk 6 Quit 7 Figure 3 3 Typical Modbus Functions Configuration Display number match is found it builds a response based on the ROC point type and parameter configured in the table If no register number match is located an error message is returned The user program will locate a register as long as it matches the beginning register number the ending register number or any number in between for that particular entry in the table When configuring the table register numbers should be unique Registers may be duplicated as long as they are located in a separate Modbus function configuration table Ifa register number is duplicated within the same Modbus function table the first occurrence will be used Also it is best to number the table from smallest register number to largest especially when using two table entries to configure a continuous group of registers Up to thirty different requests can be configured for Modbus Functions 3 4 and 16 three displays of ten register ranges By making the registers continuous meaning the start address of a new line is one greater than the end address of the previous line a continuous data table can be created up to the limit of 240 bytes This type of data table would allow access to all data with one request Up to ten different requests can be configured for Modbus Functions 1 2 5 6 and 15 For functions 1 2 5 and 15 the parameter specified should be a single byte parameter typ
41. Drive 0 1 2 3 4 5 6 7 8 9 0 1 1 1 cs Figure 2 1 File Selection Display 2 4 Interim Rev 7 98 Modbus Program User Manual After you select a valid file and press ENTER the following information is displayed File you selected is MBICOC8 H00 Is This Correct Esc cancel Fl Try again F2 OK Pressing ESC returns you to the User Routines menu pressing allows you to select a different disk file and pressing F2 brings up a new display as shown in Figure Press ESC to exit the download procedure and return to the User Routines menu If there are other program files you want to download at this time press F1 When you press F1 you are returned to the file selection display shown in Figure from which you can select and verify another program file You can repeat the process of adding more files to be downloaded up to a maximum of eight files If there is a file listed in the file download display that you decide you don t want to download after all you can remove it from the list by pressing typing in the number of the file to remove and pressing ENTER The file is removed from the list and the list is renumbered Download Multiple Files File to Download 1 MB1COC8 H00 lt Esc gt Cancel Fl More Files Enter Download Delete Figure 2 2 File Download Display When you are satisfied with the download list press ENTE
42. Form Number A4606 Part Number D301055X012 February 2002 MODBUS PROTOCOL EMULATION PROGRAM User Manual Revision Tracking Sheet February 2002 This manual may be revised from time to time to incorporate new or updated information The revision level of each page is indicated at the bottom of the page opposite the page number A major change in the content of the manual also changes the date that appears on the front cover Listed below is the revision level of each page Page Revision Pages iii through vi 7 95 Pages 1 4 1 5 2 02 Section 1 all other 7 98 Section 2 all 7 98 Section 3 all 7 98 Section 4 all 7 08 Section 5 all 7 95 Appendix A all 7 98 Appendix B all 2 96 Appendix C all 3 95 Appendix D all 5 97 Appendix E all 7 95 Fisher Controls International Inc 1991 2002 All rights reserved Printed in the U S A While this information is presented in good faith and believed to be accurate Fisher Controls does not guarantee satisfactory results from reliance upon such information Nothing contained herein is to be construed as a warranty or guarantee express or implied regarding the performance merchantability fitness or any other matter with respect to the products nor as a recommendation to use any product or process in conflict with any patent Fisher Controls reserves the right without notice to alter or improve the designs or specifications of the products described herein ii Rev 2 02 Modbus
43. Modbus Program User Manual APPENDIX E CONFIGURATION WORKSHEETS eere seen eee eene enses E 1 List of Figures and Tables Fig r 2 1 Pile Selection Display E Figure 2 2 File Download 15 1 rp ERR DENIS e Figure 3 1 Configure User Data Figure 3 2 Modbus Configuration Display cse Figure 3 3 Typical Modbus Functions Configuration 1 Figure 3 4 Modbus Host Configuration 1 1 15 Figure 3 5 Comm Port Configuration Display 3 17 Figure 3 6 Modem Control Display Figure 1 FST1 tesi hiatod oe iul n B 5 Table 1 1 ROC Supported Modbus Function 1 2 Editor WR CVS mu Table 3 1 Modbus Function Convert reset p n a ln deny Aer vec id rea xt Ia Table 3 2 Status of Host Request or eerte Table 4 1 ASCH Message Format oos beni tix BRE Table 4 2 RTU Message EE Table 4 3 Function Code 01 Host Request Example Message Table 4 4 Function Co
44. Modbus user program files When downloaded FBCLR A0 H00 will clear out any program in the A000 and A400 blocks FBCLR_A8 H00 will clear out any program in the A800 and blocks To download these programs using the GV101 configuration software select Utilities then User Program Routines and then Program Flash Memory Refer to the procedure in Section for information on how to select file and download it At the end of the procedure instead of enabling the associated user flag you should ensure that it is disabled set to 0 A Warm Start is not required Rev 7 95 5 3 Modbus Program User Manual This page intentionally blank Rev 3 95 Modbus Program User Manual APPENDIX A ROC POINT TYPES 1 ROC POINT AND DATA TYPES Point types and data types for the Remote Operations Controller ROC are shown in Tables and 2 3 4 5 6 7 amp 9 Table 1 Valid ROC Point Types Configurable Opcode Discrete Inputs Discrete Outputs Analog Inputs Analog Outputs Pulse Inputs PID Control AGA Flow Parameters Reserved Local Display Panel ROC300 w ROCPAC only AGA Flow Values Tank Parameters ROC300 w ROCPAC only ROC Clock System Flags Communications Ports 43 44 to 60 System Variables FST Registers Soft Points Reserved Database Setup ROC Tasks Reserved User Defined Reserved User Defined MVS 205 Sensor Parameters ROC407 only AGA Run Parameters not for
45. R You are presented with the following options 1 Download file s 2 Cold Hard Start and Download file s 3 Exit Back to File Selection Menu Choose options 1 or 2 for downloading the program files or option 3 for returning to the download list by typing in the number and pressing ENTER Note that option 2 performs a cold hard start which reloads all configuration data from EEPROM clears all history events and alarm logs and disables all user program tasks and User Data Types A caution to this effect appears on the screen Interim Rev 7 98 2 5 Modbus Program User Manual if you select option 2 press ENTER again if you are sure you want to continue A cold hard start can take up to 30 seconds to be completed When downloading is initiated the software first checks to see if there are any user programs in the targeted memory If so it automatically clears the appropriate User Enable flags performs a Warm Start and clears the existing user programs from the targeted memory The software then begins the downloading process Pressing ESC anytime during downloading cancels the process and returns you to the User Routines Menu During the file download which can take up to several minutes for each file information similar to the following 1 displayed Downloading File A MB1C0C8 H00 Data Sent nnnnn Segment nnnn Offset nnnn Bytes nnn When the file or files have been downloaded the software displays
46. ROC300 w ROCPAC Extra AGA Run Parameters not for ROC300 w ROCPAC User Lists ROC407 only Reserved ROC407 only The point numbers used for the physical I O point types 1 to 5 are Point numbers 0 to 63 are assigned as the field I O modular or built in I O Point numbers 64 to 68 are assigned as the diagnostic system I O Interim Rev 7 98 Modbus Program User Manual Table A 2 Data Types binary ASCII character signed character unsigned character signed integer unsigned integer signed long integer unsigned long integer float point IEEE Format Type Point or Logical Number Parameter Number 2 ROC POINT PARAMETER DEFINITIONS Tables 3 through show the parameter definitions for each point type listed in Table 1 further descriptions of the parameters used in configuring the ROC refer to the Type 101 Configuration Software User Manual Form A4 194 A 2 Interim Rev 7 98 Modbus Program User Manual Table A 3 Point Type 0 Configurable Opcode Data Type Sequence rev Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Data 8 Data 9 Data 10 Data 11 Data 12 Data 13 Data 14 Data 15 Data 16 Data 17 Data 18 Data 19 Data 20 Data 21 Data 22 Data 23 Data 24 Data 25 Data 26 Data 27 Data 28 Data 29 Data 30 Data 31 Data 32 Data 33 Data 34 Data 35 Data 36 Data 37 Data 38 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3
47. ST SEQ 2 R2 128 UC amp COM2 ROCS MODE FST2 FST SEQ 2 810 FST2 FST SEQ 2 R9 1 UC FST2 FST SEQ 2 R9 FST2 FST SEQ 2 R3 COM2 ROCS VALRCV FST2 FST SEQ 2 R2 ARGUMENT2 CLEAR3 CL2 Steps 170 through 186 work the same as the CLEAR2 routine but are used for the third ROC B 10 Rev 2 96 Modbus Program User Manual STEP LABEL CMD ARGUMENTI ARGUMENT2 170 vaL 0 UC 171 SAV FST2 FST SEQ 2 R9 172 VAL 33 UC 173 SAV FST2 FST SEQ 2 R4 174 SAV COM2 ROCS RCOUNT 175 VAL COM2 ROCS VALRCV 176 1 177 SAV FST2 FST SEQ 2 R2 178 VAL 128 UC 179 SAV COM2 ROCS 180 WT FST2 FST SEQ 2 R10 181 VAL FST2 FST SEQ 2 R9 182 1 UC 183 SAV FST2 FST SEQ 2 R9 184 gt FST2 FST SEQ 2 R3 CLEAR4 185 VAL COM2 ROCS VALRCV 186 FST2 FST SEQ 2 R2 CL3 Steps 187 through 203 work the same as CLEAR2 but are used for the fourth ROC STEP LABEL CMD ARGUMENTI ARGUMENT2 187 CLEAR4 vaL 0 UC 188 SAV FST2 FST SEQ 2 R9 189 CLA VAL 35 UC 190 SAV FST2 FST SEQ 2 R4 191 SAV COM2 ROCS RCOUNT 192 VAL COM2 ROCS VALRCV 193 1 194 SAV FST2 FST SEQ 2 R2 195 VAL 128 UC 196 SAV COM2 ROCS 197 WT FST2 FST SEQ 2 R10 198 VAL FST2 FST SEQ 2 R9 199 1 UC 200 SAV FST2 FST SEQ 2 R9 201 gt FST2 FST SEQ 2 R3 CLEARS 202 VAL COM2 ROCS VALRCV 203 FST2 FST SEQ 2 R2 CL4 Steps 204 through 221 work the
48. START Rev 2 96 B 3 Modbus Program User Manual Steps 85 and 86 place a value of 3 in FST2 register 1 Then Steps 88 and 89 perform poll failure check Next the status of the routine is verified Steps 90 to 92 and the MISCI flag is set to 0 Steps 92 to 94 STEP LABEL CMD ARGUMENTI ARGUMENT2 085 CLEAR VAL 3 UC 086 SAV FST2 FST 2 R1 087 WT 2 UC 088 VAL FST2 FST SEQ 2 R9 089 FST2 FST SEQ 2 R3 EVENT 090 VAL FST2 FST SEQ 2 R1 091 0 UC JMPC 092 VAL 0 UC 093 SAV FST1 FST SEQ 1 MISCI 094 GO START Steps 95 and 96 save the FST2 register 4 value to FST1 register 8 for reference This is the comm port Retry Count RCOUNT parameter value Steps 97 through 102 write an alarm and increment the SRBX counter by 1 and save it to register 7 so that it may be read from the FST monitor screen Steps 103 and 104 determine if polling is complete and go to the Start label if itis If register 8 equals register 4 the FST stays in a loop to prevent constantly writing alarms to the event and alarm logs Steps 105 and 106 FST2 register 4 points to the ROC and registers being polled Steps 107 through 110 determine which routine the FST was performing at the time of a communications failure and cause a return to that routine STEP LABEL ARGUMENTI ARGUMENT2 095 EVENT VAL FST2 FST SEQ 2 R4 096 SAV FSTI FST SEQ 1 R8 097 MSG COM ERROR FST2 FST SEQ 2 R4 098 ALM COM ERROR FST2 FST SEQ
49. Select an S Register Write to an S register Read an S Register Result Code Form Option Result Code Set Call Progress Option Long Space Disconnect Option Escape Code Sequence S8 DETERMINES PT IE 9 Pause Returns Last Addresed S Register Data Carrier Detect Option Data Terminal Ready Option Load Factroy Defaults Guard Tone Option Communications Mode Option Make to Break Ratio Selection Clear to Send Option Data Set Ready Option Test Command Selection Display Current Profile Synchronous Transmit Clock Source Option Rev 3 95 C 3 Modbus Program User Manual Table C 5 Result Code or Status Messages Summary Status Code Message Meaning NO CARRIER ERROR Connect 1200 No Dial Tone Busy Connect 2400 1 2 3 4 5 6 7 er Command executed Carrier detected at 300 bps Ring detected Did not detect carrier Entry error Carrier detected at 1200 bps Off hook but no response after 5 seconds Busy signal detected Carrier detected at 2400 bps 2 RS232 CARD TO DIAL UP MODEM CABLE The cable diagram shown below 15 for ROC306 312 364 with an RS232 card connected to an external dial up modem ROC DB9M 2 NDA gt Modem DB25M 3 2 20 gt N OPERATOR INTERFACE PORT DIAL UP MODEM CABLE The cable diagram shown below 15 for a ROC306 312 364 Operator Interface port connected to an external dial up modem ROC DB9M 1 gt Mode
50. a normal response message The ROC supports the Modbus function codes listed in Table Ei 4 2 1 ASCII Message Framing Framing in the ASCII transmission mode uses the colon character to indicate the beginning of the frame and a carriage return CR followed by a line feed LF to delineate the end of the frame The line feed character also serves as a synchronizing character indicating that the transmitting station is ready to receive an immediate reply Table shows the ASCII message format Table 4 1 ASCII Message Format Beginning Address Function Data Error End of Ready of Frame Check Frame to Respond Nx4 Carriage Character TW Return s 16 Bits 16 Bits s 16 Bits 16 Bits The error check used in ASCII mode is the LRC method The error check is an 8 bit binary number represented by and transmitted as two ASCII characters Refer to the Modbus Protocol Reference Guide January 1985 for more detail 4 2 2 Remote Terminal Unit Message Framing Framing in the RTU transmission mode uses the ROC address to indicate the beginning of the frame and the Error Check to indicate the end of the frame The Modbus User program uses the received Modbus function number and register number to determine how many bytes of data to receive before the two bytes of CRC The number of data bytes to receive is determined while receiving the message by looking in the configuration table for the Modbus function locating a register number
51. am User Manual Data Type Interim Rev 7 98 Table A 22 Point Type 40 MVS 205 Sensor Parameters 10 1 1 1 1 1 1 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 1 1 4 4 4 4 Sensor Tag Id Sensor Address Sensor Configuration Poll Mode Spare Sensor Status Sensor Alarms Sensor Voltage DP Diff Reading AP Press Reading PT Temp Reading DP Reverse Flow Static Press Affect DP Min Scale DP Cal Value 1 DP Cal Value 2 DP Cal Value 3 DP Cal Value 4 AP Min Scale AP Cal Value 1 AP Cal Value 2 AP Cal Value 3 AP Cal Value 4 PT Min Scale PT Cal Value 1 PT Cal Value 2 PT Cal Value 3 PT Cal Value 4 Calibrate Command Calibrate Type Set Value Manual DP Manual AP Manual PT A 17 Modbus Program User Manual A 18 Table A 23 Point Type 41 AGA Run Parameters Data Type R W AC 10 4 1 3 4 1 1 4 4 4 4 4 4 4 4 1 1 3 4 1 1 3 4 1 1 3 4 1 1 3 4 1 1 3 4 1 1 3 4 Tag Id Atmospheric Pressure Calc Method II Spare Pipe Reference Temp Pipe Material Factor Entry Def n Fb Factor Fr Factor Expansion Factor Fpb Factor Ftb Factor Ftf Factor Fgr Factor Fpv Factor 1 History Point Rollup TLP Conv 2 History Point Rollup TLP Conv 3 History Point Rollup TLP Conv 4 History Point Rollup TLP Conv 5 History Point Rollup TLP Conv 6 History Point Rollup TLP Co
52. art the Modbus program initializes the memory associated with the program to default values CAUTION Set this field to 1 only if a problem with Modbus memory is suspected Modbus configuration data will be lost for this communications port Port Switch En 1 Enables the Modbus program to switch back and forth between ROC protocol and Modbus protocol dependent upon an external event The switching enables one communications ort to use both protocols When this field is set to 0 and the Modbus program is enabled see section 29 to enable Modbus Modbus protocol 1 used on the port and protocol switching 1 ignored When set to a 1 the condition specified by the DCD 0 DI 1 SPT 2 field is used to determine which protocol is to be active NOTE The preceding parameter is supported by ROC306 ROC312 ROCPAC versions P1 00 or greater and ROC364 ROCPAC versions greater than P1 50 DCD 0 DI 1 SPT 2 Only active when the Port Switch En 1 field is set to 1 It specifies the condition that will switch protocols The possible conditions are 0 The Comm port signal is used to switch protocols When active 1 the Modbus protocol 15 used Uses DCD pin 1 on Operator Port ROC306 312 only not suported on ROC364 and DSR pin 6 on Comm 1 and Comm 2 These signals can be hardwired active by jumping them to the DTR pin 4 signal Normally used when cables are physically changed to activate switchover Interim Rev
53. ation of a Hayes compatible modem installed internally or externally Modbus Modem COM 1 l of 1 xo H 1000 ATEOVOQOHOXO amp C amp S1 0 1 ATDT2633 ATDT3818 Statu Modem Type N H I S Connect Time Config Command Connect Command Connect Command Connect Command d d d e Connect Comm Connect Comman Connect Comman Disconnect Tim ATDT2418 80 1 Update 2 5 WR Disk 6 QUIT 7 Figure 3 6 Modem Control Display The Modbus program initializes the modem upon power up host modem dial up and modem disconnect Upon initialization commands are sent to the modem to configure it for proper operation The Modbus program sends an escape sequence to place the modem in command mode and then sends the sequence AT CR that may be used by the modem to train itself to the communications of the ROC In addition to these preprogrammed sequences the user can enter a string to configure the modem for the desired state of operation In the following example the Config command string configures the modem for no echo numeric result codes display result codes Q0 go on 3 20 Interim Rev 7 98 Modbus Program User Manual hook basic result codes data carrier detect always on amp C data set ready amp S1 and to answer on one ring S0 1 ATEOVOQOHOX0 amp C amp S1 SO 1 Modem configuration is based upon the Hayes AT command set Appendix C of this manual provides modem referenc
54. ble status values Table 3 2 Status of Host Request or Command Tse arse mention 8 Vedere me 3 16 Interim Rev 7 98 Modbus Program User Manual Status values 0 and 2 through 8 are active on the host transmission These values appear for a very short period of time and then step to the next value if the process is without error If an error occurs in the step then the value 15 present until the next transmission is requested A transmission without error has a status value of 8 3 6 MODBUS HOST COMMUNICATION PARAMETERS The Communications Comm Parameters for the port on which Modbus is active determine the way the ROC communicates with other devices The Modbus host function can be under the control of an FST program The Comm Port parameters are set with the GV101 Configure Comm Ports option Figure shows a typical Comm Port configuration display ROC Comm Ports 1 of 3 Tag Local Port Key On Delay 4 Baud Rate 9600 Turnaround Delay 1 Stop Bits 1 Retry Count O0 Data Bits 8 Retry Time 0 Parity 0 Alarm Pointer 0 Status 00000000 Recv Ctr Copy 0 Mode 00000000 Retry Counter 0 Valid Rx Ctr 413 user prompt message value entry 1 Update 2 Prev 3 Next 4 5 6 Quit 7 8 Save Figure 3 5 Comm Port Configuration Display The following parameters are used for control of Modbus communications Tag This parameter identifies the Comm port being configured An identifier of up to 10 characters wil
55. blocks 6000 through 7c00 correspond to user RAM in the ROC blocks a000 through cc00 correspond to flash memory in the ROC and blocks d000 through dc00 are reserved for factory use The allocation status since the last Warm Start is shown for each memory block as follows No RAM No RAM is installed in this location GV101 Rev 1 5 or later When viewing ROC407 memory No RAM displayed for flash memory blocks a000 through cc00 means that the memory is unallocated Unalloc No program assigned or no memory installed Code Code location for user program Data Data location for user program x 1 6 EDITOR KEYS The softkeys described in Table are located along the bottom of the display and are used to operate the GV101 Configuration software and manipulate the Modbus protocol configuration displays keys except for cursor position and ESC are softkeys whose labels appear in the displays Rev 2 02 Modbus Program User Manual Key Update Prev Next RD Disk ESC Quit T4 lt Table 1 2 Editor Keys Update the information in the display Move between the different function codes Read data from a disk file A prompt appears requesting the drive and directory to be searched for scg files After selection of the directory all files with the scg extension are listed Select the file to read by following the instructions on the display If the file does not match the current point type being con
56. bus messages received by the ROC on this communication port This counter can be preset to a value or cleared 3 7 MODBUS DIAL UP OPERATION The Modbus host can dial up to six different Modbus devices When attempting to dial the address specified in the host request is compared to the addresses in modem control to determine the Connect Command to execute If the address does not match any that are configured then the first Connect Command is used Interim Rev 7 98 3 19 Modbus Program User Manual The Modbus host will retry three times before proceeding when an internal or external modem is used for the connection The Modbus program before trying to transmit examines the current state of DSR to determine whether the modem is active or not If not active the Modbus program attempts to initialize the modem and reestablish the connection If an external modem is used DSR must be configured to indicate whether the modem is active or not Often connecting DCD from the modem to DSR for the ROC will work If the external modem does not supply a signal to DSR indicating whether the modem is active or not the Modbus program will always determine that the modem is inactive and attempt to re establish the connection Refer to Appendix C Modem Reference for typical cabling configuration 3 8 MODEM CONTROL The Modem Control display Figure B 6 accessed through the Configure User Data Types menu provides the information used to control the oper
57. cale 1 4095 000 LO Float Scale 1 0000000 0 1 1 0 0 0 Modbus Funct COMI 3 of 14 TAG ID FUNCT 3A Start 201 Start 218 Start 235 Start 240 Start 301 Start 318 Start 335 Start 340 Start 401 Start 418 End Addr 217 End Addr 234 End Addr 239 End Addr 240 End Addr 317 End Addr 334 End Addr 339 End Addr 340 End Addr 417 End Addr 434 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 1 Lgl 0 Lgl 0 Conv 40 Conv 40 Conv 0 Conv 0 Conv 40 Conv 40 Conv 0 Conv 0 Conv 40 Conv 40 Param 2 Param 3 Param 4 Param 1 Param 5 Param 6 Param 7 Param 1 Param 8 Param 9 14 Rev 2 96 Modbus Program User Manual Modbus Funct COMI 4 of 14 TAG ID FUNCT 3B Start 435 End Addr 439 Type 17 Lgl 0 Param 10 Start 440 End Addr 440 Type 17 Lgl 2 Param 1 Start 501 End Addr 517 Type 17 Lgl 0 Param 11 Start 518 End Addr 534 Type 17 Lgl 0 Param 12 Start 535 End Addr 539 Type 17 Lgl 0 Param 13 Start 540 End Addr 540 Type 17 3 Param 1 Start 0 End Addr 0 Type 0 Lgl 0 Param 0 Modbus Funct COM1 12 of 14 TAG ID FUNCT 16A Start 241 End Addr 241 Type 17 Lgl 10 Param 1 Start 242 End Addr 243 Type 17 Lgl 0 Param 15 Start 244 End Addr 245 Type 16 Lgl 128 Param 19 Start 246 End Addr 246 Type 17 Lgl 28 Param 1 Start 341 End Addr 341 Type 17 Lgl 11 Param 1 Start 342 End Addr 343 Type 17 L
58. dbus in a ROC300 Series or ROC407 unit select the appropriate Modbus operation such as Modbus Config COM1 in the User Data item under the Data menu see Section 5 11 of the ROCLINK User Manual and configure parameters similar to those described in the rest of Section 3 below 3 1 CONFIGURATION ACCESS NOTE The computer running the GV101 Configuration Software must be connected to the ROC Operator Interface port before the configuration process is started From the Main Menu of the GV101 Configuration Software select the Configure option Then from the Configuration Menu select the Configure User Data Types option Figure 3 1 shows the User Data Types available for Modbus configuration Configure User Data Types Modb Modb Modb Modb Modb Modb Modem COMI Modem COM2 Modem OpPort Config COMI Funct COM1 Host COM1 Config COM2 Funct COM2 Host COM2 Config OpPort Funct OpPort Host OpPort Modb Modb Modb Modb Modb ES Modbu Select Type to Configure ROC300 Series only Figure 3 1 Configure User Data Type Display Interim Rev 7 98 3 1 Modbus Program User Manual The Modbus Config selections allow the user to edit the Modbus configuration parameters The Modbus Funct selections allow the user to edit the parameters of Modbus Function Codes 1 2 3 4 5 6 15 and 16 The Modbus Host selections a
59. de 01 ROC Response Example sse Table 4 5 Function Code 03 Host Request Example Message Table 4 6 Function Code 03 ROC Response Example 55 Table 4 7 Function Code 05 Host Request Example Message ccccesccescssssceesecseeeceeceeeeeeeeeseeesaeens Table 4 8 Function Code 05 ROC Response Example Message sse Table 4 9 Function Code 06 Host Request Example Message Table 4 10 Function Code 06 ROC Response Example Message sese Table 4 11 Function Code 15 Host Request Example Table 4 12 Function Code 15 ROC Response Example Table 4 13 Function Code 16 Host Request Example Table 4 14 Function Code 16 ROC Response Example Table 4 15 ROC Exception Response Example enar uade Table 4 16 Modbus Protocol Errors that Elicit an Exception Response Message Table4 17 History Table 4 18 History Point Numbers for Database RAM Table 4 19 Host Request for History Data Example Message sess 4 12 Table 4 20 ROC Response for History Data Example Message sess Table A 1 Valid ROC Point UE T C MER CN RTT e
60. dem control configuration display allows the user to set the modem initialize and dial commands The following paragraphs show typical commands configured for a ROC modem C 1 EXAMPLE MODEM COMMANDS Initialize Command This command is used to initialize the modem to the desired operation parameters A normal command for AT command set modems is as follows Initialize command for internal dial up modem ATHOEQQOVOX0 amp C amp S1 S0 1 Initialize command for external dial up modem ATHOE0Q0VOXO0MIL2 S0 1 3 second pause sends escape code to modem disconnect and perform software reset xxx depends on the type of modem but some modems use the same command as for hang up Il ATXXX Dial Command This command provides the modem with a phone number to dial out A normal command for AT command set modems 15 shown in the following example Dial Command ATDT 9 18005151212 where dials the number 1 800 515 1212 T tone dialing pause default is 2 seconds 9 access code for outside line Il The comma is used in this case to insert a 2 second pause after dialing a typical access code for an outside line The delay gives time for the switchboard to connect to the outside line The pause parameter is in the S8 register of the modem To increase the time in 2 second increments insert more commas The command 58 n where n is a number between 0 and 255 will change the delay time Rev 3 95 C 1
61. ds register xxxxx in byte 2 byte 3 byte 0 byte 1 order Convert Code 74 Loads register xxxxx in byte 2 byte 3 byte 0 byte 1 order regardless of MSB Ist flag 3 5 MODBUS HOST The Modbus host mode of operation allows the ROC to simulate a host device that can poll other devices for data and to store the data for parameter updates for use in FST program registers and for use as User C variables The ROC can also send commands to set outputs and to write data to a slave device The Modbus host mode is enabled by the host Enable field on the Modbus configuration display 3 14 Interim Rev 7 98 Modbus Program User Manual 3 5 1 Modbus Host Configuration The Modbus host configuration parameters are set and edited with the Modbus host Configuration Display Upon selection of a Modbus host UDP the GV101 Configuration Software displays the configuration parameters as shown in Figure Descriptions of the Modbus host configuration parameters follow the figure Up to forty different host requests commands can be configured for a Comm port Each request command can transmit or receive up to 240 bytes of data Modbus Functions 1 2 3 4 5 6 15 and 16 are supported in the host configuration Functions 1 2 3 and 4 request data from slave devices and functions 5 6 15 and 16 transmit data to a slave device Each host request configured must have a corresponding entry in the Modbus Functions configuration When using Modbus functions 1
62. e preferably a status parameter only bit 0 is used since this function packs the data into a binary format for transmission 3 6 Interim Rev 7 98 Modbus Program User Manual Each address span must be unique within the function for proper operation If not the first valid address is used A 0 in the type field disables that Request Number The following paragraphs describe the fields used in the Modbus Function parameters configuration display There is a Modbus Function Configuration worksheet in Appendix E of this manual Start Field The Start Address is a number that represents the Data Register in a Modbus device This number is used in the Value Offset field for a Modbus request In certain Modbus host devices the register 40101 1 actually transmitted as 100 The value 100 should be placed in the start address field since the ROC used the actual number sent by the host A Start Address of 0 is a valid address Any number from 0 to 65535 1s valid Register numbers can be duplicated as long as they are in separate Modbus Function configuration tables The tables should be numbered from smallest to largest End Addr Field The End Address is a number that represents the last location of a point s data The value for this number is computed by End Address Start Address Number of Functions 1 Type Field The Type field denotes the type of data associated with an address If the Type field is set to
63. e 5 Integer to Float Float Scale 6 Integer to Float Float Scale 7 Integer to Float Float Scale 8 25 to 32 No Conversion 33 Character to Integer 34 Integer to Character Interim Rev 7 98 Modbus Program User Manual Table 3 1 Modbus Function Convert Codes continued Convert Code Description Slave Host Long to Integer 36 Integer to Long 34 Packed Discrete Input Values 38 Packed Discrete Output Values 39 Float to Integer No Scaling 40 Integer to Float No Scaling 41 Float to Byte No Scaling 42 Byte to Float No Scaling 43 Float to Long No Scaling 44 Long to Float No Scaling 45 Float to Byte 46 Float to Unsigned Integer 47 Float to Unsigned Long 48 No Conversion 49 Deadband Float Scale 1 50 Deadband Float Scale 2 51 Deadband Float Scale 3 52 Deadband Float Scale 4 53 Deadband Float Scale 5 54 Deadband Float Scale 6 55 Deadband Float Scale 7 56 Deadband Float Scale 8 57 to 64 No Conversion 65 IEEE Floating Point Number 66 IEEE Floating Point Number 3 10 Interim Rev 7 98 Modbus Program User Manual Table 3 1 Modbus Function Convert Codes continued Convert Code Description Slave Host IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number IEEE Floating Point Number 75 to 255 No Conversion Convert Codes 1 to 8 Float to Integer Th
64. e Float to Integer conversion changes ROC floating point data to an integer for transmission to the host The number of the Convert Code specifies which floating point scaling value is to used for the conversion Convert Codes 17 to 24 Integer to Float The Integer to Float conversion changes a transmitted integer value to a floating point value for the ROC The number of the Convert Code specifies which floating point scaling value is to be used for the conversion If no fractional part is coming through on conversion from integer to float use a float conversion that more closely fits the range of integer to be converted e g float range 0 to 10 instead of 0 to 1000 Convert Code 33 Character to Integer The Character to Integer conversion changes a ROC character data type to an integer for transmission to the host Convert Code 34 Integer to Character The Integer to Character conversion changes a transmitted integer value to a character data type for the ROC Convert Code 35 Long to Integer The Long to Integer conversion changes a ROC long data type to an integer for transmission to the host Convert Code 36 Integer to Long The Integer to Long conversion changes a transmitted integer value to a long data type for the ROC Convert Code 37 Packed Discrete Input Values The Packed Discrete Input Values packs the status value of a maximum of 16 discrete inputs The Start and End Addresses must be the same since only one address
65. e Message Message Device Function Value Offset Data Error Check Field Address Code 1 1 2 2 2 MS LS MS LS LS MS 01H 05H 03H E9H FFH 00H CRC 16 The data sent by Function Code 5 to set or clear a coil is LSB Clear 00H 00H Set FFH 00H 4 3 4 Function Code 06 Preset a Single Register Function Code 06 allows the Host to preset a single register The register acted upon is defined by the address and parameter configured by the MODCFG EXE program The host in the following example Table requests Unit 1 to set a register at address offset 7001 to a floating point value of 100 Broadcast Mode is allowed for Function Code 6 Set the device address to 00 to initiate Broadcast Mode devices attached to the network will have the register set to the new value The ROC response Table to the command request is to re transmit the message as received after the register has been modified In the Broadcast Mode there will be no response Table 4 9 Function Code 06 Host Request Example Message Message Device Function Value Offset Data Error Check Field Address Code Bytes TX Order MS LS LS2 3 MS Value 01H 06H 1BH 59H 00 00 C8 42 4 6 Interim Rev 7 98 Modbus Program User Manual Table 4 10 Function Code 06 ROC Response Example Message Message Device Function Value Offset Data Error Check Field Address Code Bytes TX Order MS LS 1523 MS Value 1 59H 00 00 C8 42 4 3 5 Function Code 15 Force Multiple C
66. e material Configuration information for the displayed modem parameters follows Status Reflects codes returned from the modem Modem Type Indicates whether a 212 dial up modem is nonexistent N Hayes compatible located externally H or installed internally I Connect Time Represents the number of 10 millisecond intervals the program should wait for a connection response from the modem before disconnecting Config Command Provides a 30 character command line usually used to configure the operation of an internal or external 212 dial up modem Some external 212 dial up modems must be configured by a communication software package that supports the Hayes compatible command set RTU Addr Associates an address to the Connect Command The Modbus program uses the RTU Address to associate host requests to the correct Connect Command when the modem 1 configured to dial The RTU Address can have values between 0 and 255 Connect Command Provides a 30 character command line typically used to represent the phone number you wish to dial The Modbus program uses the RTU Address to associate host requests to the correct Connect Command when the modem is configured to dial NOTE When configuring Config and Connect Commands consult your modem s user manual for the valid AT command set otherwise the modem may not operate as intended Disconnect Time Represents the number of 10 millisecond intervals following the last valid m
67. eing recorded in the Event Log The Deadband uses the HI Float Scale as the upper limit and the LO Float Scale as the lower limit If the new value is outside the limits HI Limit current value HI Float Scale LO Limit current value LO Float Scale the new value 15 3 12 Interim Rev 7 98 Modbus Program User Manual written to the parameter and is logged in the Event Log if Log Data 1 The Deadband function only works on floating point values Convert Code 56 to 64 No Conversion Convert Code 65 to 72 IEEE Floating Point Number Convert codes 65 to 72 allow a four byte IEEE formatted floating point number to be sent or received in two Modbus registers with the byte orders configurable and listed below Since these conversions require two registers Modbus function 6 is not supported A check is made to ensure that an even number of registers is requested that the starting register number does not begin in the middle of a register pair and that the number of registers does not exceed the number of registers configured Byte 0 Byte 1 Byte 2 Byte 3 seee eeee emmm mmmm mmmm mmmm mmmm mmmm where 5 Sign Bit e Exponent Bit Mantissa Bit Convert Code 65 Places byte 0 and byte 1 in register xxxxx byte 2 and byte 3 are placed in register XXXXX Register xxxxx byte 0 byte 1 Register xxxxx 1 byte 2 byte 3 Convert Code 66 Places byte 0 and byte 1 in register xxxxx byte 2 and byte 3 are placed in register xxxxx
68. enu select User Program Routines Then select the User Program Routines and then the Check User Memory Allocation option A display appears that shows the allocation status of all user memory blocks in the upper half of the screen and a list of the user programs and task status in the lower half Memory blocks are 16K bytes in length and their allocation is determined by the individual user program The ROC Operating System checks each block for proper allocation and does not permit the allocation of two different programs to the same block The upper half of the display appears similar to the following Block 6000 Unalloc Block a000 Unalloc Block c000 Code 1 Block 6400 Unalloc Block a400 Unalloc Block c400 Code 1 Block 6800 Unalloc Block a800 Unalloc Block c800 Data 1 Block 6c00 Unalloc Block ac00 Unalloc Block cc00 Unalloc Block 7000 Unalloc Block b000 Unalloc Block d000 Code 2 Block 7400 Unalloc Block b400 Unalloc Block d400 Code 2 Block 7800 Unalloc Block b800 Unalloc Block d800 Data 2 Block 7c00 Unalloc Block bc00 Unalloc Block dc00 Unalloc For the ROC306 312 and ROC364 blocks 6000 through bc00 correspond to various RAM modules and blocks c000 through dc00 correspond to the RAM in a ROCPAC module For the 407 FloBoss
69. essage received before disconnecting Ifthe dial is initiated by the ROC the ROC can stay connected if it receives valid messages from the host The Disconnect Time begins following the last valid received message while the modem is connected A modem disconnect time of less than zero will not disconnect the modem Interim Rev 7 98 3 21 Modbus Program User Manual 3 9 CONTROLLING MODBUS HOST BY FST An FST can be used to schedule Modbus host requests If an FST is created to schedule host requests the FST should examine the Status parameter of the communication port and wait until the request is completed before proceeding otherwise host requests can be skipped and the desired data transfer may not have completed before proceeding Modbus host requests set Bit 7 of the Status parameter when a request is attempted Upon completion of the request Bit 7 of the Status parameter is cleared It is good practice to wait for this bit to clear before proceeding The FST cannot access errors indicated in the Modbus host Status parameter The FST needs to employ its own error checking mechanisms Using an FST other scenarios can be developed to control the Modbus hosts ability to dial other Modbus devices on a regular interval FST timers can be set to indicate when it is time for the Modbus host to call other Modbus devices Comparing values for status change limit exceeded or deadband exceeded can initiate Modbus host requests to signal warnings to
70. f Error Check Field Address Code Offset Reads Bytes 1 1 2 2 2 TX Order MS LS MS LS LS MS Value 01H 01H 03H E9H 00H 12H CRC 16 Interim Rev 7 98 4 3 Modbus Program User Manual Table 4 4 Function Code 01 ROC Response Example Message Message Device Function Byte Count Data Error Check Field Address Code 1 1 1 Byte Count 2 LS MS As Received 01H 03H CRC 16 NOTE The Byte Count defines the number of bytes of discrete data to follow and is equal to one eighth the number of discrete inputs requested The status is packed with one bit for each discrete input The low order bit of the first status byte contains the status of the first discrete input the remaining discrete input statuses follow going from low order bit to high order bit and from the first status byte to the Nth status byte For discrete input quantities that are not even multiples of eight the remaining bits in the last status byte are filled with zeroes 4 3 2 Function Codes 03 and 04 Read Output and Input Registers The host uses these function codes to obtain the analog discrete PID history and register values from the ROC A maximum of 255 bytes of inputs can be obtained per request Function Code 04 is normally used for multiple requests and modified requests Function Code 03 is normally used for stacked register configuration to allow a single request for multiple data types The host in the following example Table requests five values
71. figured an error Data Type Mismatch is displayed and the read file is aborted Save the data for a configured function A prompt appears requesting the name of the file to save Use a name that is descriptive of the function to be saved The suggested convention is scg where is the ROC number address 1 1 is the communications port number port 1 3A 1s the function number scg is the extension Do not enter Save the configuration after it has been edited After the SAVE key has been pressed a prompt appears asking if the data was meant to be saved If yes press ENTER and the data is sent to the ROC and logged in the Event Log Quit the Function Configuration Mode and return to the Configure Menu Move between data fields within a function Move between characters within a data field Interim Rev 7 98 Modbus Program User Manual SECTION 2 PROGRAM INSTALLATION This section provides instructions for installing the Modbus Protocol Emulation Program into ROC memory Make sure to read Section 1 5 of this manual for program and memory requirements If you re using the ROCLINK Configuration Software for program installation refer to Section 8 2 User Programs in the ROCLINK User Manual Form A6051 2 1 PREPARING TO DOWNLOAD THE PROGRAM To install the Modbus Protocol Emulation Program connect an IBM compatible computer containing the GV101 configuration software to the ROC Operator Interface po
72. figured correctly 8 The proper communication cards are installed and in the correct order refer to the appropriate ROC instruction manual 5 2 ROC ERROR MESSAGES Error messages are usually caused by the ROC configuration Check to see that 1 The proper format ASCII or RTU is selected 2 The Modbus Functions are configured correctly 3 There are enough continuous registers configured 4 The requested data types match the configured data types 5 The conversions are used correctly 5 3 ROC RESPONDS WITH WRONG DATA Wrong data is usually caused by the ROC configuration Check to see if 1 The data order is wrong Check MSB and LSB configuration 2 The wrong registers are configured 3 The wrong parameter is selected 4 Indexing is not proper See Section B 3 Lgl field Rev 7 95 5 1 Modbus Program User Manual 5 4 ROC APPENDS A CHARACTER TO MESSAGE Check to see if a turnaround delay is configured in the Communication Parameters when none is needed 5 5 ROC DOES NOT RESPOND IN POINT TO MULTI POINT COMM SYSTEM Check to see if the ROC responds in a point to point hook up If it does then the problem is associated with delays in the system Check see that 1 The ROC key on delay has been configured correctly 2 The ROC turnaround delay has been configured correctly 3 The host has configurable key on and turnaround delays 4 Each ROC has a unique address 5 6 DELETING USER DEFINED POINTS User Defined Poin
73. for FST number 1 LGL 0 128 starting at parameter 2 So register 109 parameter 2 of FST 1 register 110 parameter 3 of FST 1 and register 114 parameter 7 of FST 1 For another example of vertical indexing the configuration of Start 57428 End Addr 57437 17 Lgl 137 2 Conv 0 specifies ten parameters for Soft Point number 10 Lgl 9 128 starting at parameter 2 So register 57428 parameter 2 of Soft Point 10 register 57429 parameter 3 of Soft Point 10 and register 57437 parameter 11 of Soft Point 10 Another way to explain the Lgl field is that when the logical number is 128 or greater the point number will remain the same and the parameter within that point will increment When the logical number 1 less than 128 the point number will increment and the parameter number will remain the same Logical numbers are zero based For example there are 32 Soft Points with the first being logical 0 and the last being logical 31 for a total of 32 To get the correct logical number for the point you wish to access subtract 1 from the number Soft Point 5 is logical 4 and Soft Point 27 is logical 26 Analog Input 3 is logical 2 and so on Modbus protocol supports 32 Soft points so the valid Soft point logical numbers are 0 31 and 128 159 If you have 10 Analog Inputs the valid logical numbers are 0 9 and 128 137 There are 4 FST s so the valid logical numbers are 0 3 and 128 13
74. gl 0 Param 16 Start 344 End Addr 345 Type 16 Lgl 128 Param 19 Start 346 End Addr 346 Type 17 Lgl 29 Param 1 Start 441 End Addr 441 Type 17 Lgl 12 Param 1 Start 442 End Addr 443 Type 17 Lgl 0 Param 17 Rev 2 96 Modbus Program User Manual Modbus Funct COMI 13 of 14 TAG ID FUNCT 16B Start 444 End Addr 445 Type 16 Lgl 128 Param 19 Start 446 End Addr 446 Type 17 30 Param 1 Start 541 End Addr 541 Type 17 Lgl 13 Param 1 Start 542 End Addr 543 Type 17 Lgl 0 Param 18 Start 544 End Addr 545 Type 16 Lgl 128 Param 19 Start 546 End Addr 546 Type 17 Lgl 31 Param 1 Start 0 End Addr 0 Type 0 Lgl 0 Param 0 Modbus Funct COMI 6 of 14 TAG ID FUNCT 4A Start 0 End Addr 27 Type 16 Lgl 3 Param 0 Start 0 End Addr 0 Type 0 Lgl 0 Param 0 Modbus Funct COMI 10 of 14 TAG ID FUNCT 6 End Addr27 16 Lel 3 Param 0 End Addr 0 Type 0 Lgl 0 Param 0 B 16 Rev 2 96 Modbus Program User Manual Rev 2 96 Modbus Host COMI 1 of 4 HOST 09 Reg 201 0 Reg 301 Reg 0 Reg 401 Reg 0 Reg 501 Reg 0 0 0 Save 201 Save 0 Save 301 Save 0 Save 401 Save 0 Save 501 Save 0 Save 0 Save 0 Modbus Host COMI 2 of 4 HOST 1019 Reg 241 Reg 246 Reg 0 Reg 0 Reg 441 446 Reg 0 Reg 0 Reg 0 Reg 0 Save 241 Save 246 Save 0 Save 0 Save 441
75. isplay 3 2 Interim Rev 7 98 Modbus Program User Manual ASCII 0 RTU 1 This parameter sets the operating format of the Modbus Protocol installed on the ROC If set to 1 Modbus operates in Mode with CRC 16 Error Checking If set to 0 Modbus operates in the ASCII mode with LRC Error Checking Byte Order 1 MSB Ist The order of data bytes in a transmission or request can be reversed by configuring the Byte Order parameter The default value of 0 places the LSB first MSB first is selected by setting this parameter to 1 This is only effective on the Data field of a Modbus message It has no effect on the data for Function Codes 01 02 and 05 which contain byte only data Host Enable 1 When set to 1 activates the Modbus host mode Setting this parameter to 1 does not initiate a transmission but enables the program to monitor the Mode field of the Comm Port Parameters If bit 7 in the Mode Field of the Comm Port Parameters is set to 1 and Host Enable is 1 a transmission is initiated Log Data 1 Yes When set to 1 allows any changes to parameters of the ROC to also be logged in the Event Log When set to 0 the parameters are changed but not logged into the Event Log Init Memory 1 When set to 1 and transmitted to the ROC the Modbus program sets up internal registers and then resets this field to 0 On the next power up warm start or cold hard st
76. l identify the local port Comm 1 or Comm 2 ports Baud Rate Transmit and receive data baud rate in bits per second Stop Bits The number of stop bits contained in a character Data Bits The number of data bits contained in a character Parity Parity checks to be performed by the communications controller Interim Rev 7 98 3 17 Modbus Program User Manual Status This is a read only field with bits 2 and 7 used for the Modbus host Bit 7 when on 1 denotes that a Modbus host transmission 1 in progress When bit 7 is off 0 the Modbus host program is inactive or waiting for the Retry Time to time out If bit 2 is on 1 an error has occurred Bit 2 will remain on 1 until the next successful transmission 15 finished Bit 2 will then be set to off 0 Mode Setting of the Mode parameter Bit 7 to 1 starts a transmission using the request number specified by Retry Count Subsequent request numbers are transmitted until a Function Number of 0 is encountered or the last request number 39 has been transmitted At this time Bit 7 15 cleared Setting Bit 6 of the Mode parameter to 1 along with Bit 7 follows the same sequence as above Instead of stopping at a 0 function or last request the host waits the amount of time specified by Retry Time and then starts the sequence over again This process continues until Bit 7 is set to 0 Bit 3 is used to enable RTS CTS handshaking The Modbus program
77. lashPAC versions for the ROC306 ROC312 and ROCPAC FlashPAC versions greater than 1 50 for the ROC364 and all versions of the ROC407 FloBoss support program memory allocations Version 1 40 and greater of the GV101 Configuration Software supports the downloading and viewing of programs that are compiled for variable memory allocation to the ROC306 ROC312 and the ROC364 Version 1 61 and greater of the GV101 Configuration Software supports the downloading and viewing of programs that are compiled for variable memory allocation to the ROC407 FloBoss ROCLINK Configuration Software supports downloading and viewing of all variable memory allocation programs If you are not using a memory allocation version you must use the 1 and MB2B8A8 programs MB1BOA0 and 2 8 programs require RAM in Memory Expansion Slot 3 available in the ROC364 only or in 256K RAM module The other Modbus programs are named by the location in memory in which they reside The current names for Modbus programs are along with other pertinent information File ROC Type Port Code Data MBODOD8 H00 ROC300 ROCPAC LOI D0000 D7FFF D8000 DBFFF MB16070 H00 ROC300 ROCPAC Comm 1 60000 67FFF 70000 73FFF MB1B0AO0 H00 ROC300 ROCPAC Comm 1 B0000 B7FFF A0000 A3FFF MB1C0C8 H00 ROC3
78. le A 18 Point Type 16 FST Register Parameters Point Tag Id Results Register Register 1 Register 2 Register 3 Register 4 Register 5 Register 6 Register 7 Register 8 Register 9 Register 10 Timer 1 Timer 2 Timer 3 Timer 4 Message 1 Message 2 Message Data Miscellaneous Miscellaneous Miscellaneous Miscellaneous Compare Flag SVD Run Flag Code Size Instruction Pointer Execution Delay tA 10 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 14 Interim Rev 7 98 Modbus Program User Manual Table A 19 Point Type 17 Soft Point Parameters a Type AC UI FL FL Point Tag Id Integer Flag Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Data 8 Data 9 Data 10 Data 11 Data 12 Data 13 Data 14 Data 15 Data 16 Data 17 Data 18 Data 19 Data 20 Table A 20 Point Type 19 Database Setup Parameters Data Type 0 R O 1 R W 2 R W 3 R W 4 R W Interim Rev 7 98 FL UC UC UC UC 4 1 1 1 1 Pointer to Tag Archive Type Point Type Point Logical Number Parameter Number A 15 Modbus Program User Manual Table A 21 Point Type 20 ROC Task Parameters Data Type Stack Pointer Stack Segment Priority Status Task Name Child Entry Time Exit Time A 16 Interim Rev 7 98 Modbus Progr
79. llow the user to set up the Modbus configuration parameters to allow the ROC to act as a host The Modbus Modem selections allow the user to edit the Modbus Modem control parameters On selection of one of the above menu items the GV101 Configuration Software enters the Editor Mode as described in the rest of Section Bl 32 MODBUS CONFIGURATION PARAMETERS The Modbus configuration parameters are set and edited with the Modbus Configuration display Upon selection of a User Data Type the GV101 Configuration Software displays the configuration parameters as shown in Figure 3 2 Modbus Config COM1 1 np ASC 1 1 Byte Order 1 MSB lst 0 Host Enable 0 Log Data 1 Yes O0 I 0 0 0 0000000 0000000 0000000 0000000 Init Memory 1 Port Switch En 1 DCD 0 DI 1 SPT 2 Modbus Baud Rate 1200 Switch Baud Rate 9600 Input Data Start 100 Output Data Start 300 H teger le 4095 LOW Integer le 0 HI Float le 1 0000000 LO Float le 1 0000000 000000000000200 14 J OY OY dS C CO IS cl Next 4 RD Disk 5 WR Disk Figure 3 2 Modbus Configuration Display The following paragraphs describe the Modbus configuration parameters as shown on the d
80. m DB25M N amp 3 2 Rev 3 95 Modbus Program User Manual APPENDIX D COMMUNICATION WIRING communications cards that can be installed in a ROC300 series unit Table shows the communi cations signal connections for the COMI port and the various communications cards available for the port on ROC407 Tables through show signal connections for ROC to ROC communications Table D 1 shows the communications signal pin outs for the operator interface port and the various edin s pl Table D 1 ROC300 Series Communications Signals L m eS OPERATOR INTERFACE PORTS pco mx ix com rrocsssorporT rx bm COMMUNICATIONS CARDS COMMUNICATIONS CARDS 422 Usage meme 485 Usage ea lt e LEASED LINE MODEM COMM Port TIP2 RING2 RINGI 4 wire Private Line LEASED LINE RING MODEM RJ 11 Port nts GRN 2 Wire Operation LEASED LINE TIP2 RING RING2 MODEM RJ 11 Port BLK RED YEL 4 Wire Operation GRN DIAL UP MODEM RING RJ 11 Port ENT CRY DIAL UP MODEM E COMM Port output DOWN only for analyzer Signal present only LED equipped version of card Rev 5 97 D 1 Modbus Program User Manual Table D 2 ROC407 Communications Signals 3 2 gt
81. match and gathering the data type Table 4 2 shows the RTU message format Table 4 2 RTU Message Format 4 2 Interim Rev 7 98 Modbus Program User Manual The Modbus RTU protocol applies a cyclical redundancy check on the message string to produce a 16 bit remainder This remainder is referred to as the CRC 16 code The CRC 16 code is then appended to the end of the message string On receipt of the message the error check sequence is again performed and if the result is the same the message contained no transmission errors Refer to the Modbus Protocol Reference Guide January 1985 for more detail on the CRC 16 code generation 4 3 EXPLANATION OF FUNCTIONS The Modbus functions implemented in the ROC are described in the following paragraphs along with examples of their usage 4 3 1 Function Codes 01 and 02 Read Output and Input Status The host uses these function codes to obtain the discrete input values from the ROC A maximum of 64 discrete inputs can be installed in the ROC and can be obtained in one request Function Code 02 values are normally read only input status values while Function Code 01 values can be written to by another function code The host in the following example Table requests eighteen status inputs starting at address offset 1001 from Unit 1 Table shows the ROC response message to the host request Table 4 3 Function Code 01 Host Request Example Message Message Device Function Coil DI Number o
82. nv Interim Rev 7 98 Modbus Program User Manual Table A 23 Point Type 41 AGA Run Parameters continued Data Type 7 History Point Rollup TLP Conv 8 History Point Rollup TLP Conv 9 History Point Rollup TLP Conv 10 History Point Rollup TLP Conv 1 3 4 1 1 3 4 1 1 3 4 1 1 3 4 Interim Rev 7 98 A 19 Modbus Program User Manual Table A 24 Point Type 42 Extra AGA Run Parameters R W AC Tag Id Flow Today Flow Yesterday Flow Month Flow Prev Month Flow Accumulated Minutes Today Minutes Yesterday Minutes Month Minutes Prev Month Minutes Accumulated Energy Today Energy Yesterday Energy Month Energy Prev Month Energy Accumulated Uncorrect Today Uncorrect Yesterday Uncorrect Month Uncorrect Prev Month Uncorrect Accum Orifice Diameter Tf Pipe Diameter Tf Beta Velocity of Approach Coeff of Discharge Reynold s Number Upstream Pressure Molecular Weight tA 10 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 20 Interim Rev 7 98 Modbus Program User Manual Table A 25 Point Type 43 User List Parameters R W AC 10 Text 1 Text 2 Text 3 Text 4 Text 5 Text 6 Text 7 Text 8 Text 9 Text 10 Text 11 Text 12 Text 13 Text 14 Text 15 Text 16 Data 1 Data 2 Data 3 Data 4 Data 5 Data 6 Data 7 Data 8 Data 9 Data 10 Data 11 Data 12 Data 13 Data 14 Data 15 Data 16 3
83. o 1000 values 0 to 100 0 decimal point implied by setting the values in this field to 0 for the Low Scale and 1000 for the High Scale The scaling is used only on Analog I O specified by I O type 3 AIN parameter 17 Raw A D Input and I O type 4 AO parameter 9 Raw D A Output The HI INTEGER SCALE and LOW INTEGER fields are normally used when the host is not able to process floating point numbers HI Float Scale LO Float Scale In host systems that do not accept floating point numbers eight sets of floating point ranges for values can be specified This allows floating point values such as PID setpoints to be read and set by the host as integer values The ROCS floating point values are converted to integers by configuring a register or range of registers with the CONV field set in the Function Code configuration The equations used to convert floating point to integer to enable the reading of floating point values are Float Range Hi Float Scale Low Float Scale Integer Range Hi Integer Scale Low Integer Scale Adj Reading Float Reading Low Float Scale Integer Integer Range x Adj Reading Low Integer Scale Float Range The equations used to convert integers to floating point values are Float Range Hi Float Scale Low Float Scale Integer Range Hi Integer Scale Low Integer Scale Adj Integer Integer Sent Low Integer Scale Float Value Adj Integer x Float Range Low Float Scale Integer Range
84. odbus Program User Manual 2 2 1 Clear User Enable Flag If you are using a ROC364 with a ROCPAC version 1 50 or earlier you need to check the User Coml and Com2 Enable flags before downloading Modbus Protocol Emulation Program Using the GV101 Configuration Software select the Configure menu and then the ROC System Flags option In the screen that appears User Enable and User Com2 Enable flags must be set to 0 to disable operation of any user programs that may be running tasks on COMMI or COMM2 Otherwise the ROC Operating System will detect an error and enable the Watchdog Timeout Later ROC and GV101 versions perform this step automatically 2 2 2 Download Utility To download the Modbus Protocol Emulation Program select the Utilities option from the Main Menu of the GV101 Configuration Software From the ROC Utilities Menu select the User Program Routines option In the resultant User Routines menu select the Download User Programs option to download to RAM This option checks the operating system to see if any user application programs are currently enabled or running If one or more programs are running a prompt appears requesting permission to disable the programs by clearing the User Enable flags and performing a Warm Start Pressing ENTER disables the User Enable flags and then proceeds with the rest of the download procedure as described below Pressing ESC cancels the download procedure and returns you to the User Routines
85. og data The Address Table normally resides at the start of the Modbus Registers either at location 0 or 40000 The Address Table is assigned a register location by specifying a starting and ending address for Data Type 44 in Function Code 3 configuration The Address Table consists of four words or registers described as follows INPUT DATA START Contains the starting register address of the Input data table OUTPUT DATA START Contains the starting register address of the Output data table HI INTEGER SCALE Contains the 100 value for all analog data Type 3 Parameter 17 and Type 4 Parameter 9 registers LOW INTEGER SCALE Contains the 096 value for all analog data Type 3 Parameter 17 and Type 4 Parameter 9 registers In the ROC the endpoints of the Analog Inputs and the Analog Outputs are used to scale or calibrate the range of the input or output signal Since each I O point can have different scaling the Raw Values from the Analog I O points are normalized to the values defined by the HI INTEGER SCALE and LOW INTEGER SCALE fields 3 4 Interim Rev 7 98 Modbus Program User Manual These values are signed integers so they can range from zero to 32767 The default signal range is 800 to 4000 which represents a 1 to 5 volt or 4 to 20 milliamp signal These data fields can also be used to scale the Analog I O to integer values with implied decimal point For example all Analog I O Raw values can be transmitted with 0 t
86. oils This function code allows the Host to change the state of a block of consecutive coils The Host can transfer data more efficiently with Function Code 15 than with Function Code 04 There can be up to 64 coil outputs with Function Code 15 The host in the following example Table requests Unit 1 to set two coils starting at address offset 1001 to the ON state Broadcast Mode is allowed for Function Code 15 Set the device address to 00 to initiate Broadcast Mode devices attached to the network will have the selected coils set to The ROC response Table to the command request is an echo of the device address function code starting address and quantity of coils set In the Broadcast Mode there will be no response Table 4 11 Function Code 15 Host Request Example Message Message pon Function Value Quantity Byte Data Es Field pon Code Offset Count Es Byte Cnt MS LS MS LS LS MS 03H E9H 00H 02H CRC 16 Interim Rev 7 98 4 7 Modbus Program User Manual Table 4 12 Function Code 15 ROC Response Example Message Message Device Function Value Offset Quantity Error Field Address Code Check 1 1 2 2 2 MS LS MS LS LS MS 01H 03H E9H 00H 02H CRC 16 NOTE The Broadcast Mode sets all specified coils active Unused coils specified will be ON and their outputs will be active Use caution when attempting to service devices with unused coils NOTE The byte count indicates the number of by
87. onal Gain Override Integral Gain Override Derivative Gain Override Scale Factor Override Integral Deadband Override Process Variable Override Output EU Override Switch Process Variable WwW BW WN He WwW BW We 1 4 4 2 4 4 4 4 4 4 4 4 2 4 4 2 4 4 4 4 4 4 4 4 Interim Rev 7 98 A 7 Modbus Program User Manual 3 Table A 10 Point 7 Flow Parameters Data Type R W AC 10 4 4 1 1 4 4 4 2 4 4 4 1 30 1 4 4 4 4 4 4 4 4 Tag Id Latitude Elevation Calculation Method AGA Configuration Specific Gravity Heating Value Gravitational Accel Scan Period Pipe Diameter Orifice Diameter Orifice Reference Temp Orifice Material Meter Run Id Alarm Code Low Alarm High Alarm Viscosity Specific Heat Ratio Base Pressure Base Temperature Low Flow Cutoff Fpwl Gravitational correction factor N2 Nitrogen CO2 Carbon Dioxide H2S Hydrogen Sulfide 2 Water He Helium CH4 Methane C2H6 Ethane 8 Propane C4H10 n Butane C4H10 i Butane C5H12 n Pentane C5H12 i Pentane C6H14 n Hexane C7H16 n Heptane C8H18 n Octane C9H20 n Nonane C10H22 n Decane Interim Rev 7 98 Modbus Program User Manual Table A 10 Point Type 7 AGA Flow Parameters continued Data Type O2 Oxygen CO Carbon Monoxide H2 Hydrogen Not used Stacked Dp Enable Low Dp Input Differential Pressure Input Static Pressure Input Temperat
88. ransmission of the input data start register output data start register high integer scale and low integer scale values A total of 4 registers must be specified 4 4 3 Discrete Outputs Discrete outputs have a special case when Function Code 16 is used with Parameter 1 Time On selected and a floating point value is written to Parameter 1 The floating point value has different effects on the discrete output They are Value Effect Discrete output latched off Discrete output latched on gt 1 Discrete output momentary on value is in seconds 0 No effect gt lt 1 No effect In order to utilize this capability the Modbus function table must be configured with the following parameters Modbus Funct COMI TAG ID FUNCT 1 Start 100 End Addr 100 Type 2 Lgl 1 Update 2 Prev 3 Next 4 RD Disk 5 WR Disk 6 Quit Interim Rev 7 98 4 13 Modbus Program User Manual 4 14 This page is intentionally blank Interim Rev 7 98 Modbus Program User Manual SECTION 5 PROBLEM SOLVING 5 1 ROC FAILS TO RESPOND TO HOST REQUESTS If the ROC does not respond to a Modbus request check to see that 1 Power 15 applied 2 The ROC is plugged into the correct host communications port 3 The ROC is cabled correctly 4 The station address is correct 5 The baud rate is properly set 6 The number of data bits and stop bits 15 correctly set 7 The ROC communications port is con
89. ration Worksheets Interim Rev 7 98 1 1 Modbus Program User Manual 1 4 MODBUS PROTOCOL EMULATION PROGRAM OVERVIEW The Modbus Protocol Emulation program allows a Remote Operations Controller ROC to emulate the Modbus Protocol This makes it possible to integrate a ROC into a Modbus host system or to use the ROC as a Modbus system host in the Modbus host mode The Modbus Protocol Emulation program when running on the ROC364 provides the Modbus Protocol at COMI COM2 and the Operator Interface port The Operator Interface port can use the protocol within the limitation that protocol switching is not hardware supported using the DCD switch option and modem dial out is not supported An external modem may be used when operating as a slave Modbus device The Modbus Protocol Emulation program when running on the ROC306 or ROC312 provides the Modbus Protocol at the COMM port and the Operator Interface port The limitations discussed for the ROC364 do not apply to the ROC306 312 The ROC306 312 supports both modem dial out and port switching The Modbus Protocol Emulation program when running on the ROC407 FloBoss provides the Modbus Protocol at the COMI port and COM2 port No program is provided to run on the Operator Interface port The ROC407 FloBoss also supports both modem dial out and port switching The program is configured and downloaded to ROC RAM by the Type GV101 Configuration Software Modbus functions are configured by point
90. rt Before the downloading process is started make sure the RAM is available in the ROC for the intended download To run the GV101 software perform the following steps Ensure that the current disk drive and directory is the one in which the GV101 software is installed Note If you have added the drive and directory of the GV101 software to the PATH statement in your AUTOEXEC BAT file then you can skip this step Alternately if a batch file named GV101 BAT has been written that sets the drive and directory and 15 locatable by the PATH statement you can skip this step See your DOS user manual for help on modifying the PATH statement or writing a batch file To change the current drive at the DOS prompt type in the drive letter followed by a colon such as C and press ENTER To change the current directory type in CD followed by a backslash and the directory name such as CD NGV101 and then press ENTER Next type in GV101 at the DOS prompt and press ENTER The GV101 Configuration Software then loads and initializes This may take from 1 to 5 seconds depending on the speed of your computer When the GV101 Software is done loading log on by entering your identification and code number 2 2 DOWNLOAD PROCEDURE FOR GV101 VERSION 1 4 The download procedure in this section is used with GV101 Configuration Software version 1 4 If you have a more recent version refer to Section 2 3 or b 4 as appropriate Interim Rev 7 98 2 1 M
91. s retried STEP LABEL CMD ARGUMENTI ARGUMENT2 014 SEND2 VAL 0 UC 015 SAV FST2 FST SEQ 2 R9 016 S2 VAL 10 UC 017 SAV FST2 FST SEQ 2 R4 018 SAV COM2 ROCS RCOUNT 019 VAL COM2 ROCS VALRCV B 6 Rev 2 96 Modbus Program User Manual 020 021 022 023 024 025 026 027 028 029 030 SAV VAL SAV WT VAL SAV VAL 2 UC FST2 FST 5 2 R2 128 UC COM2 ROCS MODE FST2 FST SEQ 2 R10 FST2 FST SEQ 2 R9 1 UC FST2 FST SEQ 2 R9 FST2 FST SEQ 2 R3 COM2 ROCS VALRCV FST2 FST SEQ 2 R2 SEND3 52 Steps 31 through 47 work the same as the SEND2 routine above but are used for the third ROC STEP LABEL 031 032 033 034 035 036 037 038 039 040 041 042 043 044 045 046 047 SEND3 53 CMD VAL SAV VAL SAV SAV VAL SAV VAL SAV WT VAL SAV VAL ARGUMENTI 0 UC FST2 FST SEQ 2 R9 22 UC FST2 FST SEQ 2 R4 COM2 ROCS RCOUNT 2 5 VALRCV 2 UC FST2 FST SEQ 2 R2 128 UC COM2 ROCS MODE FST2 FST SEQ 2 R10 FST2 FST SEQ 2 R9 1 UC FST2 FST SEQ 2 R9 FST2 FST SEQ 2 R3 COM2 ROCS VALRCV FST2 FST SEQ 2 R2 ARGUMENT2 SEND4 53 Steps 48 through 64 work the same as the SEND2 routine but are used for the fourth ROC STEP LABEL Rev 2 96 048 049 050 051 052 053 054 055 056 057 058 059 060 061 SEND4 S4 CMD VAL SAV VAL SAV SAV VAL SAV VAL SAV WT VAL SAV
92. s in base RAM and allows 35 days of hourly values or 840 entries for all 50 database points Historical data can be retrieved by using Function Code 04 and by specifying the month and the day of the history database No parameter number is required The Value offset determines which point is accessed in the history database In the following example for a ROC300 series Table 4 19 the host requests data for July 23rd from Unit 1 at Database Point 7001 The point to be accessed is the requested address minus the Start Address If the Start Address for Function Code 04 Point Type 42 is configured as 7001 Database Point 0 would be accessed Table 4 19 Host Request for History Data Example Message Message Device Function Value Month Error Field Address Code Offset Bytes TX Order MS LS LS MS Value 1 59H CRC 16 The ROC will respond with a message as shown in Table 42d The 104 byte data message contains the information for the day and month requested The ROC will return all zeros if no data is available for the day and month requested 4 12 Interim Rev 7 98 Modbus Program User Manual Table 4 20 ROC Response for History Data Example Message Message Device Function Byte Data Error Check Field Address Code Count Byte Count Selectable As Received 4 4 2 Address Table Point Type 44 for ROC300 Series units with a ROCPAC or Point Type 64 for the ROC407 and ROC300 Series units with a FlashPAC allows the t
93. same as CLEAR2 but are used for the fifth ROC Step 221 sends the program to the Reset routine after all the ROCs have been polled STEP LABEL CMD ARGUMENTI ARGUMENT2 204 CLEARS VAL 0 UC 205 SAV FST2 FST 5 2 R9 206 CL5 VAL 37 UC 207 SAV FST2 FST SEQ 2 84 Rev 2 96 B 11 Modbus Program User Manual Steps 222 to 224 reset register 1 to a value of 0 and return the program to the start B 12 208 209 210 211 212 213 214 215 216 217 218 219 220 221 STEP LABEL 222 223 224 225 226 RESET SAV VAL SAV VAL SAV WT VAL SAV VAL GO CMD VAL SAV END COM2 ROCS RCOUNT COM2 ROCS VALRCV 1 FST2 FST SEQ 2 R2 128 UC COM2 ROCS FST2 FST SEQ 2 R10 FST2 FST SEQ 2 R9 1 FST2 FST 5 2 R9 FST2 FST SEQ 2 R3 RESET COM2 ROCS VALRCV FST2 FST 5 2 R2 CLS RESET ARGUMENTI 0 UC FST2 FST SEQ 2 RI START ARGUMENT2 Rev 2 96 Modbus Program User Manual The illustrations on pages B 13 through B 21 are screen representations of various GV101 configuration parameters used in writing an FST FST Registers 2 of 4 Point Tag Id Result Register Register 1 Register 2 Register 3 Register 4 Register 5 Register 6 Register 7 Register 8 FST SEQ 2 128 0000 1 000000 331 0000 3 000000 2 000000 0000000 0000000 0000000 10 00000 Timer 3 Timer 4 Message 1 Message 2 Miscellaneous
94. ser Manual Table A 7 Point Type 4 Analog Output Parameters Point Tag Id Units Adjusted D A 0 Adjusted D A 100 Low Reading EU High Reading EU Value in EUs Mode Alarm Code Raw D A Output Table 8 Point Type 5 Pulse Input Parameters Point Tag Id Units Rate Flag Rate Period Type Scan Period Conversion Lo Alarm EU Hi Alarm EU Lo Lo Alarm EU Hi Hi Alarm EU Rate Alarm EU Deadband or Rollover Value in EUs Mode Alarm Code Accumulated Value Current Rate Today s Total Yesterday s Total 1 1 1 2 4 4 4 4 4 4 4 4 1 1 4 4 4 4 6 Interim Rev 7 98 Modbus Program User Manual Table A 9 Point Type 6 PID Parameters Point Tag Id Control Type Loop Status Scan Time Primary Input Definition Primary Output Definition Primary Switch Setpoint Primary Switch Process Variable Definition Primary Switch Mode Override Input Definition Override Output Definition Override Switch Setpoint Override Switch Process Variable Definition Override Switch Mode Primary Setpoint Primary Setpoint EU min Primary Loop Period Primary Proportional Gain Primary Integral Gain Primary Derivative Gain Primary Scale Factor Primary Integral Deadband Primary Process Variable Primary Output EU Primary Switch Process Variable Minimum Control Time Override Setpoint Override Setpoint EU min Override Loop Period Override Proporti
95. sion 1 61 or later If you are downloading the Modbus program to RAM in a ROC407 use the procedure given in Section 23 To download the Modus Protocol Emulation Program to flash memory select Utilities option from the Main Menu of the GV101 Configuration Software and then select the User Program Routines option In the resultant User Routines menu select the Program Flash Memory option This utility allows you to load a program from a disk file into the ROC407 flash memory Use the Check User Memory Allocation routine discussed in Section if you want to see whether or not a user program is currently loaded in the intended memory area Since the Modbus program has at least two files that can be loaded into different segments of flash memory this may help determine which file to use Note that the downloading process for flash memory does not clear an already loaded program out of the targeted memory area If you need to clear a program from flash memory to make room for the Modbus program refer to Section 5 9 When you start the Program Flash Memory utility a display appears for selecting the program files to loaded This display see Figure lists the names of all the files that have the extension and are located in the default drive and directory Use the and down arrow keys to indicate the desired file in the list and then press ENTER If the desired file is not listed you can instead select a drive and directory
96. st slave system 1 2 SCOPE OF THIS MANUAL This manual describes how to configure and use the Modbus Protocol Emulation Program The Modbus Protocol Emulation Program is configured by using either the ROCLINK or GV101 Configuration Software The software uses an IBM compatible computer and the MS DOS operating system Menu descriptions in this manual are for version 1 5 or later of the GV101 software and version 1 70 or later of the Modbus Protocol Emulation program Note that this interim manual does not discuss how to use the ROCLINK Configuration Software version 2 0 or later which is required for downloading and configuring the Modbus user programs for a ROC with a FlashPAC Refer instead to the ROCLINK User Manual Form A6050 dated February 1998 or later or refer to a later edition of this Modbus manual Form A4606 1 3 ORGANIZATION OF THIS MANUAL In this manual the sections are arranged to provide information in the order in which it is needed for first time users Once the user becomes familiar with the procedures and the software is running in a ROC the manual can be used as a reference tool The manual is organized into the following major sections Section Getting Started Program Installation Sectio Modbus Configuration Sectio Modbus Message Format Sectio Problem Solving Appendix Point Types Appendix B Progamming Examples Appendix Modem Reference Appendi Communications Wiring Appendix Configu
97. starting at address offset 7001 from Unit 1 The ROC responds Table by sending five floating point values The Byte Count is twenty four bytes per value Table 4 5 Function Code 03 Host Request Example Message Message Function Register Number of Error Check Field Code Offset Reads Bytes TX Order MS LS MS LS LS MS Value 1 59H 00H 05H CRC 16 4 4 Interim Rev 7 98 Modbus Program User Manual Table 4 6 Function Code 03 ROC Response Example Message Message Device Function Byte Count Data Error Check Field Address Code Byte Count Selectable As Received NOTE The Byte Count defines the number of bytes of register data to follow and depends on the type of data requested 4 3 3 Function Code 05 Force a Single Coil This packet structure allows the host to force a single coil Function Code 05 to either ON or OFF Broadcast mode is allowed by Function Code 5 The host in the ue Table requests Unit 1 to set a coil at address offset 1001 The ROC response Table 8 to the command request is to re transmit the message as received after the state of the coil has been verified In Broadcast Mode there would be no response Table 4 7 Function Code 05 Host Request Example Message Message 8 Function Value Offset Data Error Check Field 8 Code MS LS MS LS LS MS 03H E9H FFH 00H CRC 16 Interim Rev 7 98 4 5 Modbus Program User Manual Table 4 8 Function Code 05 ROC Response Exampl
98. t Pt 22 DATA13 SEND 028 VAL SFP1 Soft Pt 1 DATA14 029 SFP21 Soft Pt 21 DATA14 SEND 030 VAL SFP2 Soft Pt 2 DATA14 031 SFP22 Soft Pt 22 14 SEND 032 VAL SFP1 Soft Pt 1 DATA15 033 SFP21 Soft Pt21 DATAI5 SEND 034 VAL SFP2 Soft Pt 2 DATAI15 035 SFP22 Soft Pt22 DATAI5 SEND 036 VAL SFP1 Soft Pt 1 DATA16 037 SFP21 Soft Pt21 DATA16 SEND 038 VAL SFP2 Soft Pt 2 DATAI16 039 SFP22 Soft Pt22 DATAI6 SEND 040 GO START If a value is to be sent to the field Steps 41 through 64 will first place the new current values into softpoints for reference and Steps 65 and 66 will place a 2 in FST2 register 1 to initiate the send sequence STEP LABEL CMD ARGUMENTI ARGUMENT2 041 SEND VAL SFP11 Soft Pt 11 INT1 042 SAV SFP21 Soft Pt 21 INT1 043 VAL SFP12 Soft Pt 12 INT1 044 SAV SFP22 Soft Pt 22 INT1 045 VAL SFP13 Soft Pt 13 INT1 046 SAV SFP23 Soft Pt 23 INT1 047 VAL SFP14 Soft Pt 14 INTI 048 SAV SFP24 Soft Pt 24 INTI 049 VAL SFP1 Soft Pt 1 DATA13 050 SAV SFP21 Soft Pt 21 DATA13 051 VAL SFP2 Soft Pt 2 DATA13 052 SAV SFP22 Soft Pt 22 DATA13 B 2 Rev 2 96 Modbus Program User Manual 053 VAL SFP1 Soft Pt 1 14 054 SAV SFP21 Soft Pt 21 DATA14 055 VAL SFP2 Soft Pt 2 DATA14 056 SAV SFP22 Soft Pt 22 DATA14 057 VAL SFP1 Soft Pt 1 5 058 SAV SFP21 Soft Pt 21 5 059 VAL SFP2 Soft Pt 2 DATAIS 060 SAV SFP22 Soft Pt 22 5 061 VAL SFP1 Soft Pt 1 DATA16
99. t Pt 5 SRBX 016 VAL IOA8 AT 410K ALARM 017 SFP6 Soft Pt 6 SRBX 018 VAL IOA9 AT 411K ALARM 019 SFP7 Soft Pt 7 SRBX 020 VAL IOA10 AT 010K ALARM 021 G SFPS Soft Pt 8 SRBX 022 VAL IOA11 AT 011K ALARM 023 SFP9 Soft Pt 9 SRBX 024 VAL IOB3 ZSC 404K STATUS 025 SFP10 Soft Pt 10 INT1 SRBX 026 VAL IOB4 ZSC 406K STATUS 027 SFP11 Soft Pt 11 INT1 SRBX 028 VAL IOBS XS 412K STATUS 029 SFP12 Soft Pt 12 INT1 SRBX 030 VAL IOA13 XY 404K STATUS 031 SFP13 Soft Pt 13 INT1 SRBX B 22 Rev 2 96 Modbus Program User Manual 032 GO 5 Steps 33 through 70 provide the SRBX routine Steps 33 and 34 save the value of 1 to the FSTI MISCI parameter This provides a flag indicating that SRBX is active The host ROC will clear this flag after polling for information The SRBX active indication is saved to message 1 of FSTI to display that an SRBX is pending Steps 36 to 39 save a 0 to the Coml Retry Count and 128 is saved to the Mode to initiate an SRBX transmission Steps 40 through 65 save new reference values to softpoints for future comparisons Step 66 inserts a 10 second delay Steps 67 and 68 force the communications port Mode to 0 to put the ROC back into the receive mode Steps 69 70 insert a wait equal to the value in register 10 and then a minimum wait of 45 seconds After this wait the ROC will return to the Start label to see whether the SRBX flag
100. t Switch En 1 DCD 0 DI 1 SPT 2 Modbus Baud Rate Switch Baud Rate Input Data Start Output Data Start HI Integer Scale LOW Integer Scale HI Float Scale 1 LO Float Scale 1 1 1 0 0 0 0 0 9600 9600 100 300 32676 0 100000 0 0000000 HI Float Scale 2 LO Float Scale 2 HI Float Scale 3 LO Float Scale 3 HI Float Scale 4 LO Float Scale 4 HI Float Scale 5 LO Float Scale 5 HI Float Scale 6 LO Float Scale 6 HI Float Scale 7 LO Float Scale 7 HI Float Scale 8 LO Float Scale 8 Modbus Funct 2 3 of 14 Start 201 Start 218 Start 235 Start 240 Start 301 Start 318 Start 335 Start 340 Start 401 Start 418 Rev 2 96 End Addr 217 End Addr 234 End Addr 239 End Addr 240 End Addr 317 End Addr 334 End Addr 339 End Addr 340 End Addr 417 End Addr 434 TAG ID FUNCT 3A Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Type 17 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 0 Lgl 1 Lgl 0 Lgl 0 150000 0 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 0000000 Param 2 Param 3 Param 4 Param 1 Param 5 Param 6 Param 7 Param 1 Param 8 Param 9 Modbus Program User Manual B 20 FP gt 3 Start 435 Start 440 Start 501 Start 518 Start 535 Start 540 Start 0 Start 0 Start 0 Start 0 Start 24
101. t conversion changes a transmit ted integer value to a floating point data type for the ROC Convert Code 41 Float to Byte No Scaling The Float to Byte conversion changes a ROC floating point data type to a byte for transmission to the host Convert Code 42 Byte to Float No Scaling The Byte to Float conversion changes a transmitted byte value to floating point data type for the ROC Convert Code 43 Float to Long No Scaling The Float to Long conversion changes a ROC floating point data type to a Long Integer for transmission to the host Convert Code 44 Long to Float No Scaling The Long to Float conversion changes a transmitted Long Integer value to a floating point data type for the ROC Convert Code 45 Float to Byte Unsigned Character The Float to Byte Unsigned Character conversion changes a transmitted floating point value to an unsigned character data type for the ROC Convert Code 46 Float to Unsigned Integer The Float to Unsigned Integer conversion changes a transmitted floating point value to an unsigned integer data type for the ROC Convert Code 47 Float to Unsigned Long The Float to Unsigned Long conversion changes a transmitted floating point value to an unsigned long data type for the ROC Convert Code 49 to 56 Deadband The Deadband code is normally used in the host mode when there is frequent polling of a slave device and logging to the Event Log is selected The deadband prevents minor changes from b
102. ter Host Register Number of Number No No Registers Modbus Function Configuration Worksheet Starting Ending Point Logical Parameter Conversion Register Register Type Number Number Code If you have comments or questions regarding this manual please direct them to your local sales representative or contact Emerson Process Management Flow Computer Division Marshalltown IA 50158 U S A Houston TX 77065 U S A Pickering North Yorkshire UK 018 7JA
103. ter to IN M MR ED 5 5 ROC Does Not Respond in Point to Multi Point Comm System 54 Deleting Us r Defin d POS use bassi Sube EE pau ERPaS cho Dass stu eura suo tasa Rien eMa De 5 7 Integer To Float Conversion 58 ROC Response Preceded By Modem Commands 5 9 Deleting A User Program from ROC407 Flash APPENDIX ROC POINT TYPES eesesseseeseeseccesseseecesseseesorseecesorseecosoesereorseecesoeseecesoesersorseeeeseree A ROG POINT AND DATA TYPES teciubth rk e EAE 1 A DEFINITIONS pa UE A 2 APPENDIX B PROGRAMMING EXAMPLE eerte Host ROC FUNCTION SEQUENCE TABLE 81 eterne etae HJ Hos ROC FUNCTION SEQUENCE TABLE B 3 Field ROC FUNCTION SEQUENCE TABLE APPENDIX C MODEM REFERENCE sssscssssssssssssssssssssssssnecsssssnssccesssssecsssssnsccessssnssecsssssseesessans C1 Example Modem Commands p C 2 to Dial up Modem q4 C3 Operator Interface port to Dial up Modem Cable c4 pi APPENDIX D COMMUNICATION WIRING e esee iv Rev 7 95
104. tes of register or coil data to follow and is equal to one eighth the number of coils requested for Function Code 15 For Function Code 15 the status is packed with one bit for each coil The low order bit of the first status byte contains the status of the first coil the remaining coil statuses follow going from low order bit to high order bit and from the first status byte to the Nth status byte For coil quantities that are not even multiples of eight the remaining bits in the last status byte are filled with zeroes 4 3 6 Function Code 16 Preset Multiple Registers This function code allows the host to change values in registers The host can transfer data more efficiently with Function Code 16 than with Function Code 06 There can be up to 60 registers of outputs with Function Code 16 Broadcast Mode is allowed by Function Code 16 The host in the following example Table requests Unit 1 to set a register starting at address offset 7001 to a floating point value of 100 Broadcast Mode is allowed for Function Codel6 Set the device address to 00 to initiate Broadcast Mode devices attached to the network will have the register set to the new value The ROC response Table to the command request is an echo of the device address function code starting address and quantity of coils set In the Broadcast Mode there will be no response 4 8 Interim Rev 7 98 Modbus Program User Manual Table 4 13 Function Code 16 Host Request
105. that has the file you want Note that the current drive and directory are given at the top of the list After you select a valid file and press ENTER the following information is displayed File you selected is FBMB1 A0 H00 Is This Correct Esc cancel Fl Try again F2 OK Pressing ESC returns you to the User Routines menu pressing F1 allows you to select a different disk file and pressing F2 starts the download process and brings up the following message Downloading File A0 H00 Waiting for setting Up Flash memory After displaying the above message for a few seconds the following downloading message appears Interim Rev 7 98 2 7 Modbus Program User Manual Downloading File 1 A0 H00 Data Sent nnnnn Segment nnnn Offset nnnn Bytes nnn Pressing ESC anytime during downloading which can take several minutes cancels the process and returns you to the User Routines Menu When the file has been downloaded the software displays the following message Programming the Flash memory please wait This message automatically clears after flash memory has been successfully programmed You are then returned to the User Routines menu Before the Modbus Protocol Emulation Program as well as any previously loaded user programs can be run the User Enable flag associated with the loaded program must be set The download routine for flash memory does not change the
106. the following message Download complete Press ENTER to Enable Flags Automatically lt Esc gt to Cancel Press ENTER to automatically enable the appropriate User Enable flags with a 1 and perform a Warm Start Note that certain user programs can be enabled with values other than a 1 If you have just loaded such a program refer to its user manual for more information and wish to set the User Enable flag to a 2 or 3 or if for some reason you don t want to start running the user programs yet then press ESC to bypass automatic enabling of the User Enable flags If you bypass automatic enabling you will need to use the ROC Flags display to set the proper User Enable flags and perform a Warm Start If you chose to enable User Flags automatically the following appears on the screen Wait for Warm Start Flag Enable Complete press any key to Continue You are then returned to the User Routines menu 2 6 Interim Rev 7 98 Modbus Program User Manual 24 PROCEDURE FOR DOWNLOADING TO FLASH MEMORY If you re using the ROCLINK Configuration Software for program installation refer to Section 8 2 User Programs in the ROCLINK User Manual Form A6051 ROCLINK is required for downloading to the FlashPAC in a ROC300 Series unit The download procedure in this section is used only to download the Modbus program to the flash memory in a 407 This procedure requires using GV101 Configuration Software ver
107. tiates a poll if within 2 minutes of midnight Steps 8 and 9 initiate a poll if the current MND minus the last MND is less than or equal to the value in register 10 30 Step 10 is a program delay to keep MCU loading down Steps 11 to 14 save miscellaneous flag values to registers that can be read from the FST monitor screen Step 15 initiates a poll of all field units if the MISCI flag equals 1 SRBX STEP LABEL CMD ARGUMENTI ARGUMENT2 005 START MND 006 SAV G FSTI FST SEQ 1 R2 007 lt 2 UC POLL 008 FST1 FST SEQ 1 R3 009 gt 1 SEQ 1 R10 POLL 010 WT 2 UC 011 FST1 FST SEQ 1 MISC2 012 SAV 1 SEQ 1 85 013 VAL FST1 FST SEQ 1 MISC1 014 SAV SEQ 1 R6 015 1 UC POLL Rev 2 96 B 1 Modbus Program User Manual In Steps 16 through 40 current register values are compared with previous register values If changes have occurred all Function 16 values are sent to the field If no changes have occurred Step 40 sends the FST back to the Start label STEP LABEL CMD ARGUMENTI ARGUMENT2 016 VAL SFP11 Soft Pt 11 INT1 017 SFP21 Soft Pt 21 INT1 SEND 018 VAL SFP12 Soft Pt 12 INT1 019 SFP22 Soft Pt 22 INT1 SEND 020 VAL SFP13 Soft Pt 13 INT1 021 SFP23 Soft Pt 23 INT1 SEND 022 VAL SFP14 Soft Pt 14 INTI 023 SFP24 Soft Pt 24 INT1 SEND 024 VAL SFP1 Soft Pt 1 DATA13 025 SFP21 Soft Pt21 DATA13 SEND 026 VAL SFP2 Soft Pt 2 DATA13 027 SFP22 Sof
108. to transmit the value to the ROC To begin execution of the Modbus program as well as any other user programs loaded into the ROC one of the following restart sequences must be initiated Warm Start Initiated when the Warm Start flag in the ROC Flags display is set to 1 and saved This method has the least effect on the ROC AII I O scanning is temporarily suspended but the I O retains its last state History events and alarms are not affected Cycling Power Initiated by turning the ROC power off and then back on Do not use this method if the ROC has active analog or discrete outputs Cycling power causes power to be removed from the control devices Cold Hard Start Initiated when the Cold Hard Start flag in the ROC Flags display is set to and saved This method causes all configuration data to be reloaded from EEPROM or from ROM history events and alarms are cleared This method will not work if the User Enable flags have not been previously saved to EEPROM because the old values in EEPROM are used In most cases the Warm Start 1 the preferred method to get the user programs running Interim Rev 7 98 2 3 Modbus Program User Manual 2 3 DOWNLOAD PROCEDURE FOR GV101 VERSION 1 51 AND LATER The download procedure in this section is used with GV101 Configuration Software version 1 51 and later However if you are downloading the Modbus program to flash memory in a ROC407 use the procedure given in Section
109. ts can be deleted by first disabling the user program that defines the User Defined Point and then performing a cold hard start The cold hard start initializes the database and removes the User Defined Point definitions providing they have not previously been saved to EEPROM 5 7 INTEGER TO FLOAT CONVERSION Integer to float conversions may not produce a fractional component To correct use a float scale range that more closely corresponds to the range of the integer being converted 5 8 ROC RESPONSE PRECEDED BY MODEM COMMANDS If the ROC sends modem commands before the transmission of a response to a request connect the ROC s DSR signal to the modem s DCD signal or a similar pin indicating modem activity The DSR of some modems can be configured to indicate modem activity 5 2 Rev 3 95 Modbus Program User Manual S 9 DELETING A USER PROGRAM FROM ROC407 FLASH MEMORY User programs loaded in the flash memory of a ROC407 FloBoss are not deleted in the same way user programs loaded in RAM would be deleted Programs loaded in RAM are removed with the Clear AII User Memory selection under User Program Routines in the Utilities menu of GV101 This routine has no effect on user programs loaded in flash memory To clear programs loaded into flash memory you must download a dummy user program containing all zeros to the affected blocks of flash memory Two such programs A0 H00 and FBCLR 8 are supplied with the other
110. type and parameter The ROC uses physical addressing of while Modbus applications use logical I O addressing to retain compatibility with Modbus 1 4 1 Modbus Compatibility The Modbus Protocol Emulation program functions 1 2 3 4 5 6 15 and 16 use the same command and response format as the functions listed in the Gould Modbus Protocol Reference Guide January 1985 form PI MBUS 300 Rev B Depending upon the parameter configured Byte Word Double Word or Floating Point functions 3 4 and 6 can contain more data bytes than the other functions The data byte upper limit is 240 bytes ROC point types and parameters for Modbus functions 1 2 3 4 5 6 15 and 16 are configured using the GV101 Configuration Software Any supported ROC point type and parameter can be selected for function codes 3 4 6 and 16 Function codes 1 2 5 and 15 are restricted to input and output status point types Table 1 1 provides details of the Modbus function codes supported by the ROC 1 2 Interim Rev 7 98 Modbus Program User Manual Table 1 1 ROC Supported Modbus Function Codes eon Mowing Read Logic Coil Status Obtain current status ON OFF of a group of logic coils Read Discrete Input Status Obtain current status ON OFF of a group of discrete inputs Read Output Registers Obtain current binary value in one or more holding Holding registers Read Input Registers Obtain current binary value in one or more inp
111. ure Input Low Dp Setpoint High Dp Setpoint Meter Value Static Pressure Value Temperature Value KR BBR PB WW WRK HL Table A 11 Point Type 9 Local Display Panel LDP Parameters Data Type R W 10 Text for Line 1 R W 10 Text for Line 2 R W 10 Text for Line 3 R W Data for Line 1 R W Data for Line 2 R W Data for Line 3 Interim Rev 7 98 Modbus Program User Manual Table A 12 Point Type 10 AGA Flow Value Calculation Parameters Meter Value Static Pressure Value Temperature Value Instantaneous Flow Instantaneous Energy Flow Today Energy Today Flow Yesterday Energy Yesterday Pressure Extension hpwf C Prime Sample Time Expansion Factor Fr Ftf Fpv Fgr Fb Fpb Ftb Fa A 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 10 Interim Rev 7 98 Modbus Program User Manual Table A 13 Point Type 11 Tank Parameters Tag Units Level Input Meter Output Pulse Input Scan Period Alarm Code Not used Rate Alarm EU Strapping Value Specific Gravity Level Deadband Manual Entry Total Units Hauled Current Fluid Level Contract Hour Level Units Discharged Today s Volume Yesterday s Volume Last Scan Level Corrected Base PI Seconds Minutes Hours Day Month Year Leap Year Day of Week Date and Time e Interim Rev 7 98 A 11 Modbus Program User Manual Table A 15 Point
112. ut registers Force Single Logic Coil Force logic coil to a state of ON or OFF Preset Single Holding Place a specific binary value into a holding register Register Force Multiple Logic Coils Force a series of consecutive logic coils to defined ON or OFF states Preset Multiple Holding Place specific binary values into a series of consecutive Registers holding registers 1 4 3 Data Link The data link between the host device and the ROC can be a serial data link operating at up to 9600 baud or any of the following ROC communications cards EIA 232 Serial Communications Card EIA 422 485 Serial Communications Card Radio Modem Communications Card Leased Line Modem Communications Card Dial Up Modem Communications Card The data link can operate in the RTU Remote Terminal Unit mode or the ASCII American Standard Code for Information Interchange mode In the RTU mode data is sent in 8 bit binary characters In the ASCII mode each RTU character is divided into two 4 bit parts that are represented by their hexadecimal equivalent The ASCII mode uses twice as many characters as the RTU mode Each character sent is composed of a Start bit 8 or 7 Data bits and one or two Stop bits with Even Odd or No parity The communications parameters are defined in the ROC Comm Ports configuration screen of the GV101 configuration software Interim Rev 7 98 1 3 Modbus Program User Manual 1 5 VERSIONS AND PROGRAM NAMES ROCPAC and F
113. will assert the RTS signal and wait for the CTS in response When CTS is detected the message is sent RTS CTS handshaking is not supported on ROC407 version 1 00 Key On Delay Push To Talk Delay in 50 millisecond intervals for ROC306 312 or ROC364 and 10 millisecond intervals for ROC407 FloBoss Allows the radio equipment to become fully operational before transmitting Normal setting would be 4 for the ROC300 Series and 20 for the 407 200 milliseconds Turnaround Delay or Key Off Delay Allows a delay to be configured for turning off the RTS signal in 50 millisecond intervals for the ROC300 Series and 10 millisecond intervals for ROC407 A Turnaround Delay of 0 will result in the RTS signal being turned off in the middle of the last character transmitted A Turnaround Delay of 1 or 2 on the ROC 300 Series will turn off the RTS signal approximately 100 milliseconds after the last character is transmitted and a value of 3 or 4 will turn off RTS after approximately 200 milliseconds and so on A Turnaround Delay of 1 on the ROC 407 will turn off the RTS signal 0 to 10 milliseconds after the last character is transmitted and a value of 2 will turn off RTS after 10 to 20 milliseconds and so on The ROC300 Series Modbus user program is limited to a resolution of 100 milliseconds by the ROC Operating System The ROC407 Modbus user program 1 scheduled by the operating system as soon as the
114. writing an FST ROC Address ROC Group Station Name Active PID s Active AGA s Active TANK s Base DB Pt s DB Pt s RAM2 DB Pt s Not Used Contract Hour B 24 System Variables 1 of 1 4 Version Name 2 Fisher ID KAHAIF 4 Time Created ROM Serial Customer Name Max PID s Max AGA s Max TANK s FST Active RAM Installed ROM Installed MPU Loading Utilities W68013X0082 Ver 1 61 Fisher NETREX Systems Sep 09 13 27 04 1993 None FISHER ROC300 16 5 8 1 01101111 10000000 65 42194 00011101 Rev 2 96 Modbus Program User Manual Modbus Config COMI 1 of 1 ASCII 0 I Byte Order 1 MSB Ist Host Enable 1 Log Data 1 Yes Init Memory 1 Port Switch En 1 DCD 0 DI 1 SPT 2 Modbus Baud Rate Switch Baud Rate Input Data Start Output Data Start HI Integer Scale LOW Integer Scale HI Float Scale 1 LO Float Scale 1 0 1 1 0 0 0 0 1200 1200 100 300 32676 0 0000000 0000000 HI Float Scale 2 LO Float Scale 2 HI Float Scale 3 LO Float Scale 3 HI Float Scale 4 LO Float Scale 4 HI Float Scale 5 LO Float Scale 5 HI Float Scale 6 LO Float Scale 6 HI Float Scale 7 LO Float Scale 7 HI Float Scale 8 LO Float Scale 8 Modbus Funct COMI 3 of 14 TAG ID FUNCT Start 401 Start 418 Start 435 Start 437 Start 438 Start 439 Start 440 tA gt Ut Rev 2 96 End Addr 417 Type 3 End Addr 434 End Addr 436 4 End Addr
115. y S 3 21 SECTION 4 MODBUS MESSAGE FORMAT eee sees eene tn stata stis tns ta 4 1 4l MODESOPTRANSNIISSIUN ca Ned tein EUN a ett edes eeu Me aav 4 42 Modbus MESSAGE CONTENT senis ee esent eoa rhetor nae thea aen Fe px HERR URP NEN EHE NE sn 423 ASCH Message 4 2 Rev 7 95 iii Modbus Program User Manual 4 2 2 Remote Terminal Unit Message sese AS EXPLANATION OF FUNCTIONS Ska E Fu EE see pna RT E E DUE 4 3 1 Function Codes 01 and 02 Read Output and Input Status sss 4 3 2 Function Codes 03 and 04 Read Output and Input Registers 4 3 3 Function Code 05 Force a Single Coll 4 3 4 Function Code 06 Preset a Single Register 4 3 5 Function Code 15 Force Multiple 4 3 6 Function Code 16 Preset Multiple Registers 4 3 7 44 sp cial FUNCTIONS Tm 44 1 Historical Data a 442 Address nU er 4 4 3 Discrete OUMU SECTION 5 PROBLEM SOLVING 5 1 ROC Fails to Respond to Host Requests uii oou iSo a pisi Rt PN Deu QUNM EI nu OH DN 5 2 ROC WIGS SACS X 5 3 ROC Responds with Wrong nennen 5 4 Appends Charac

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