TelePACE Ladder Logic
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1. the protocol type station number protocol task priority and store and forward messaging options The protocol configuration can be set in four ways e using the TelePACE or ISaGRAF programs e using the set_protocol function from a C application program e writing to the I O database from a C or ladder logic application program or e writing to the I O database remotely from a Modbus or DF1 compatible device To configure protocol settings through the I O database add the module CNFG Protocol settings to the Register Assignment Protocol Type The protocol type may be set to emulate the DF1 or Modbus protocols or it may be disabled When the protocol is disabled the port functions as a normal serial port Station Number The TeleBUS DF protocols allow up to 255 devices on a network Station numbers identify each device A device responds to commands addressed to it or to commands broadcast to all stations The station number is in the range 0 to 254 Address 255 indicates a command broadcast to all stations and cannot be used as a station number Each serial port may have a unique station number Task Priority A task is responsible for monitoring each serial port for messages The real time operating system RTOS schedules the tasks with the application program tasks according to the task priority The priority can be changed only with the set_protocol function from a C application program The default task priority is2. 3 Changing the priority is not recommended Store and Forward Messaging Store and forward messaging is not supported by the TeleBUS DF 1 protocols Default Parameters All ports are configured at reset with default parameters when the controller is started in SERVICE mode The ports use user defined parameters when the controller is reset in the RUN mode The default parameters are listed below Parameter___ com1_ com2__ Com3__ com4 9600 9600 9600 Parity none none None none Data bits TeleBUS DF1 Protocol User and Reference Manual 7 Parameter___ com1__ com2__ Com3 com4 Protocol Modbus Modbus Modbus Modbus Powe fru ru rr ero Rx flow control none none Rx Rx disable disable Serial time out 60s 60s 60s 60s Minimum Protected DF1 Address Maximum 11534 11534 11534 11534 Protected DF1 Address Notes com3 is supported only when the SCADAPack Lower I O module is installed com4 is supported only when the SCADAPack Upper I O module is installed To optimize performance minimize the length of messages on com3 and com4 Examples of recommended uses for com3 and com4 are for local operator display terminals and for programming and diagnostics using the TelePACE program TeleBUS DF1 Protocol User and Reference Manual I O Database The TeleBUS protocols read and write information from the I O database The I O database is an area of memory that can be accessed by C programs L
3. DF1 Addresses I O database registers are assigned within the controller s Register Assignment using Modbus addressing When polling the controller from an DF1 device it is necessary to know the DF1 address corresponding to each assigned register In general the cross reference between Modbus and DF1 addressing is shown in the following table DF1 addresses in this table are described in the format word bit where word is the address of a 16 bit word and bit is the bit within that word The bit address is optional DF1 0 0 to 255 15 single bit registers Modbus 10001 to 14096 Digital Input Database Modbus 30001 to 31024 Analog Input Database DF1 512 to 1535 16 bit registers Modbus 40001 to 49999 Analog Output Database DF1 1536 to 11534 16 bit registers Coil Registers To convert a Modbus coil register ModbusCoil to an DF1 address word bit word ModbusCoil 00001 16 bit remainder of ModbusCoil 00001 16 Status Registers To convert a Modbus status register ModbusStatus to an DF1 address word bit word ModbusStatus 10001 16 256 bit remainder of ModbusStatus 10001 16 Input Registers To convert a Modbus input register Modbus nput to an DF1 address word word Modbusinput 30001 512 Holding Registers To convert a Modbus holding register ModbusHolding to an DF1 address word word ModbusHolding 40001 1536 Example In this example the equivalent DF1 addres
4. to 624 15 single bit registers Modbus 10001 to 14096 Digital Input Database Modbus 30001 to 31024 Analog Input Database DF1 1250 to 11248 16 bit registers Modbus 40001 to 49999 Analog Output Database DF1 11249 to 21247 16 bit registers Coil Registers To convert a Modbus coil register ModbusCoil to an DF1 address word bit word ModbusCoil 00001 16 bit remainder of ModbusCoil 00001 16 Status Registers To convert a Modbus status register ModbusStatus to an DF1 address word bit word ModbusStatus 10001 16 625 bit remainder of ModbusStatus 10001 16 Input Registers To convert a Modbus input register Modbus nput to an DF1 address word word Modbus nput 30001 1250 Holding Registers To convert a Modbus holding register ModbusHolding to an DF1 address word word ModbusHolding 40001 11249 Example In this example the equivalent DF1 addresses are shown next to a sample SCADAPack Register Assignment specified with Modbus addresses Register Register Range SCADAPack Lower I O module digital outputs 0 0 to 0 11 digital inputs 625 0 to 625 15 analog inputs 1250 to 1257 DIN 5203 4 digital 10017 10019 626 0 to 626 2 inputs DIAG Force LED 10020 10020 MO SCADAPack 40001 Bios AN 1249 to 111250 AOUT module TeleBUS DF1 Protocol User and Reference Manual 13 Slave Mode The TeleBUS DF protocols operate in slave and master modes simultaneously
5. 535 TeleBUS DF1 Protocol User and Reference Manual 9 For ISaGRAF firmware there are 9999 input registers located in the analog input section of the I O database Input registers are contained within the DF1 addresses 1250 to 11247 Holding registers are 16 bit registers that the protocol can read and write For TelePACE firmware there are 9999 holding registers located in the analog output section of the I O database Holding registers are contained within the DF1 addresses 1536 to 11534 For ISaGRAF firmware there are 9999 holding registers located in the analog output section of the I O database Holding registers are contained within the DF1 addresses 11248 to 21247 Writing any value to a general purpose register stores the value in the register Writing a value to an assigned register writes the value to the assigned I O module Reading a general purpose register returns the value stored in the register Reading an assigned register returns the value read from the I O module Accessing the I O Database Using TelePACE Ladder logic programs access the I O database through function blocks All function blocks can access the I O database The function blocks in ladder logic use only the Modbus addressing scheme Refer to the TelePACE Ladder Logic Reference and User Manual for details C language programs access the I O database with two functions The dbase function reads a value from the I O database The setdbase function writes a va
6. A RA ia 16 Protected Write dci cas tank ill aa aE E ae A EA Aa beri ded daa Te a ated E 16 TeleBUS DF1 Protocol User and Reference Manual 2 Unprotected Read ics eves ciclo it da Da 16 Protected Bit Writes sucia aah eta oe dean e ae a aaae 17 Unprotected Bit Write lar ates fea den angi di eee it ti 17 Unprotected Write ic nasra a ten tactic acid enn techie ibid e 17 SENGING MESSAGES cuidada dia 17 Polling DET PLE Sueca iran is 18 TeleBUS DF1 Protocol User and Reference Manual 3 TeleBUS DF1 Protocol Overview TeleBUS communication protocols provide a standard communication interface to the controller The protocols operate on a wide variety of serial data links These include RS 232 serial ports RS 485 serial ports radios leased line modems and dial up modems The protocols are generally independent of the communication parameters of the link with a few exceptions TeleBUS protocol commands may be directed to a specific device identified by its station number or broadcast to all devices Up to 255 devices may connect to one communication network The TeleBUS protocols provide full access to the I O database in the controller The I O database contains user assigned registers and general purpose registers Assigned registers map directly to the I O hardware or system parameter in the controller General purpose registers can be used by ladder logic and C application programs to store processed information and to receive inf
7. In slave mode the controller responds to commands sent by another device Commands may be sent to a specific device or broadcast to all devices The TeleBUS DF1 protocols emulate the protocol functions required for communication with a host device which uses the Non Privileged commands from the DF1 Basic Command Set These functions are described below Consult the DF1 I O driver documentation included with the SCADA package or specific DF1 documentation for details on these commands In most cases a knowledge of the actual commands is not required to set up the host system Broadcast Messages A broadcast message is sent to all devices on a network Each device executes the command No device responds to a broadcast command The device sending the command must query each device to determine if the command was received and processed Broadcast messages are supported for function codes that write information A broadcast message is sent to station number 255 Function Codes The table summarizes the implemented function codes Note that slave commands at the protocol layer access the I O database in physical byte addresses However in master mode the interface to the TeleBUS DF1 protocol accesses the I O database in physical 16 bit word addresses The interface function block MSTR and C function master_message are described in the Master Mode section below The maximum number of 16 bit words that can be read or written with one slave comm
8. TelePACE Ladder Logic Warranty and License CONTROL MICROSYSTEMS SCADA products for the distance 28 Steacie Drive Telephone 613 591 1943 Kanata Ontario Facsimile 613 591 1022 K2K 2A9 Technical Support 888 226 6876 Canada 888 2CONTROL TelePACE Ladder Logic Warranty and License 2000 2001 Control Microsystems Inc All rights reserved Printed in Canada Trademarks TeleSAFE TelePACE SmartWIRE SCADAPack TeleSAFE Micro16 and TeleBUS are registered trademarks of Control Microsystems Inc All other product names are copyright and registered trademarks or trade names of their respective owners Material used in the User and Reference manual section titled SCADAServer OLE Automation Reference is distributed under license from the OPC Foundation TeleBUS DF1 Protocol User and Reference Manual Table of Contents TABLE OF CONTENTS niaii daa 2 TELEBUS DF1 PROTOCOL OVERVIEW c s cccessecceseseeeeeeeeseeeeeeeseenseeeseeeseeeseaeeeeeeseanseeesees 4 Compatibility 22 1 15 2 anaes EAE PE E E evinced E via ses males E E atta aeceviansd eda E asda 4 SERIAL PORT CONFIGURATION 0 cceecceceseeeeeeeseeeeeeeeneeseseeeeeseeeeneeseseeneesesesnensesesneesnensenanes 5 Communication Parameters sssr oratoriae aeaee ainai eeaeee a ine Ee aeea aha aIt 5 Protocol Parameters eiea hoe aea ae E caves aa e de Seas Tessa a e REAO 5 Baud Rate nana arte sua e aa a AE Na OAEI AEEA E a e a ET EEA 6 Duplex cat dados 6 Protocol P
9. adder Logic programs ISaGRAF programs and communication protocols The I O database allows data to be shared between these programs The I O database contains user assigned registers and general purpose registers User assigned registers map directly to the I O hardware or system parameter in the controller Assigned registers are initialized to the default hardware state or system parameter when the controller is reset Assigned output registers do not maintain their values during power failures However output registers do retain their values during application program loading General purpose registers are used by ladder logic ISaGRAF and C application programs to store processed information and to receive information from remote devices General purpose registers retain their values during power failures and application program loading The values change only when written by an application program or a communication protocol Coil and Status Registers Coil and status registers contain one bit of information that is whether a signal is off or on For TelePACE firmware coil registers are single bits which the protocols can read and write There are 4096 coil registers located in the digital output section of the I O database Coil registers are contained within the DF1 16 bit addresses 0 to 255 For TelePACE firmware status registers are single bits which the protocols can read There are 4096 status registers located in the digital inpu
10. and message is shown in the maximum column pemp E o Protected Writes words of data to limited 121 Write areas of the database freon l ESA Read area of the database 02 Protected Bit Sets or resets individual bits 30 Write within limited areas of the database Write any area of the database A ES Write of the database Functions 0 2 5 and 8 support broadcast messages The functions are described in detail below TeleBUS DF1 Protocol User and Reference Manual 14 Protected Write The Protected Write function writes 8 bit values into limited areas of the I O database Access to the I O database is limited to the protected address range Any number of bytes may be written up to the maximum number The write may start at any byte address provided the entire block is within the protected address range The protected address range is set using the setABConfiguration function from a C application program Unprotected Read The Unprotected Read function reads 8 bit values from any area of the I O database Access to the I O database is limited to the unprotected address range Any number of bytes may be read up to the maximum number The read may start at any byte address provided the entire block is within the unprotected address range Protected Bit Write The Protected Bit Write function sets or resets individual bits within limited areas of the I O database Access to the I O database is limited to the protected addres
11. arameters cin ii Re ee ec 7 Protocol Type miis ee ete 7 Station NUMDET 00 eee At ive tenet ein inde 7 TAS ke PROM cuco RA eset ee aes delat aceasta igen Began east 7 Store and Forward Messaging cccceeeeeeeeeeeeeeeeeeeeeeeeeeaeeeseecaeeeeeeaeeeeeeecaeeeeeenaeeeeeeaas 7 Detaullt Parameters cecilia ada 7 WO DATABASE ia oo A ATI ceca A AANE 9 Coil and Status Registers a as 9 Input and Holding RegisterS oooooconnncccnnnncccccnnnoncccnnnoncncnnnonccc nono ncnc nano nc nn conan n nc cnnnn nn cccnannncnnns 9 Accessing the I O Database Using TelePACE ooonnnccccnnocccinnnoncccnnnnono canon cnn nr cnn 10 Modbus Addressing ic nico di 10 DF Addressing iio Sl uted A eed eve nd ee tee 10 Converting Modbus to DF1 Addresses oooocccconoccccconocccccononcnccnnoncnc nano ncnnn nano nc rra nn 11 Accessing the I O Database Using ISaGRAF ccinncccconoccccnononcnnnnnnono canon cnn nr cnn 12 Modbus Addressing aiticia io roses 12 DETAddressiNOi vitre OE EAE a roce 12 Converting Modbus to DF1 AQUTesses ooooocccnoccccconoccccnononcncnanoncnc nano nonan cana ncnrnnn rca 12 SLAVES MODE oa 000 14 Broadcast Messages ti ta 14 FUNCION CodeS cuina cial ad 14 Protected Wicca o A E dd 15 Unprotected REA wuss coctiias teta dan A dae 15 Protected Bit Writes com otitis cti ida 15 Unprotected Bit Write art tinta 15 Unprotected Writes 0000 Ai ide 15 MASTER MODE nnana SAANEEN EEEN N cued dative cuuasttvesedhtve ii 16 FUNCION CodeS intra RS A AAA I
12. ate sets the communication speed The possible settings are determined by the type of serial data link used The table below shows the possible settings for the controller Note that not all port types and baud rates are available on all controller ports Port Type Possible Recommended Setting Settings RS 232 or 75 baud 110 baud 150 baud 300 baud 600 baud 1200 baud 2400 baud 4800 baud 9600 baud 19200 baud 38400 baud 57600 baud 115200 baud 75 baud 110 baud 150 baud 300 baud 600 baud 1200 baud 2400 baud 4800 baud 9600 baud 19200 baud 38400 baud RS 232 Dial up modem Duplex Use the highest rate supported by all devices on the network Use the highest rate supported by all devices on the network The TeleBUS DF1 protocols communicate in one direction at a time However the duplex setting is determined by the type of serial data link used The table below shows the possible settings for the controller Note that not all port types are available on all controllers Port Type Possible Recommended Setting Settings half duplex full duplex half duplex full duplex TeleBUS DF1 Protocol User and Reference Manual Use full duplex wherever possible Use half duplex for most external modems Slave stations always use half duplex Master stations can use full duplex only on 4 wire systems Protocol Parameters The TeleBUS DF protocols operate independently on each serial port Each port may set
13. ess range of the slave device Data can be written into any area of the master I O database within its unprotected address range Any number of 16 bit registers may be read up to the maximum number supported by the slave device or the maximum number above which ever is less The read may start at any TeleBUS DF1 Protocol User and Reference Manual 16 16 bit register provided the entire block is within the unprotected address range of the slave device Protected Bit Write The Protected Bit Write function sets or resets individual bits in the I O database of the slave device Access to the I O database is limited to the protected address range of the slave device The data may come from any area of the master I O database within the unprotected address range One 16 bit register with a bitmask is used to write up to 16 bits of data The register must be within the protected address range of the slave device Unprotected Bit Write The Unprotected Bit Write function sets or resets individual bits in any area of the I O database of the slave device Access to the I O database is limited to the unprotected address range of the slave device The data may come from any area of the master I O database within its unprotected address range One 16 bit register with a bitmask is used to write up to 16 bits of data The register must be within the unprotected address range of the slave device Unprotected Write The Unprotected Write function w
14. esses the I O database in physical 16 bit word registers The interface function block MSTR and C function master_message are described in the Sending Messages section below The maximum number of 16 bit registers that can be read or written with one message is shown in the maximum column The slave device may support fewer registers than shown consult the manual for the device for details Function _ Name Description ea Write areas of the database Unprotected Reads words of data from any trams area orie ites o os Protected Bit Sets or resets dividual bits Write within limited areas of the database MA A Write any area of the database Se Write area of the database Protected Write The Protected Write function writes 16 bit values into the I O database of the slave device Access to the I O database is limited to the protected address range of the slave device The data may come from any area of the master I O database within its unprotected address range Any number of 16 bit registers may be written up to the maximum number supported by the slave device or the maximum number above which ever is less The write may start at any 16 bit register provided the entire block is within the protected address range of the slave device Unprotected Read The Unprotected Read function reads 16 bit values from any area of the I O database of the slave device Access to the I O database is limited to the unprotected addr
15. g and addressing The controllers do not mimic the internal functioning of any programmable controller Device specific functions those that relate to the hardware or programming of a specific programmable controller are not implemented TeleBUS DF1 Protocol User and Reference Manual 4 Serial Port Configuration Communication Parameters The TeleBUS DF protocols are in general independent of the serial communication parameters The baud rate and parity may be chosen to suit the host computer and the characteristics of the data link The port configuration can be set in four ways e using the TelePACE program e using the set_port function from a C application program e writing to the I O database from a C or ladder logic application program or e writing to the I O database remotely from a Modbus or DF1 compatible device To configure a serial port through the I O database add the module CNFG Serial port settings to the Register Assignment Protocol Parameters The TeleBUS DF protocols are eight bit character oriented protocols The table below shows possible and recommended communication parameters Setting section below section below Data Bits 8 data bits 8 data bits Parity none none even odd Stop bits 1 stop bit 1 stop bit 2 stop bits Flow control disabled disabled Duplex see Duplex section see Duplex section below below TeleBUS DF1 Protocol User and Reference Manual Baud Rate The baud r
16. lows selection of either word or byte addressing when interpreting only these commands Setting SLC bit S 2 8 1 selects byte addressing so that for example a slave word address of 7 specified in MSTR accesses SLC word address 7 These commands can access SLC memory only in the CIF or Common Interface File N9 See further details in section 12 15 of the SLC500 Instruction Set manual L2ieie L2ieie ie as These commands can access MicroLogix memory only in the CIF or Common Interface File N7 See further details in section 12 15 of the MicroLogix 1000 Instruction Set manual These commands can access memory only in the CIF or PLC 2 compatibility file N7 See further details in section 16 7 of the PLC 5 manual TeleBUS DF1 Protocol User and Reference Manual 18
17. lue to the I O database These functions use either Modbus or DF1 physical addressing Refer to the TelePACE C Tools Reference and User Manual for full details on these functions Modbus Addressing Modbus addressing is used in all ladder logic program functions The controller s Register Assignment is also configured using Modbus addresses The C functions dbase and setdbase support Modbus addressing When the specified port is configured for one of the Modbus protocols the function master_message uses Modbus addressing Coil registers are single bit addresses ranging from 00001 to 04096 Status registers are single bit addresses ranging from 10001 to 14096 Input registers are 16 bit addresses in the range 30001 to 31024 Holding registers are 16 bit addresses in the range 40001 to 49999 DF1 Addressing DF1 addressing is used by the MSTR ladder logic function when the specified port is configured for one of the DF1 protocols Modbus addressing must be used in all other ladder logic program functions DF1 addressing is used by function master_message when the specified port is configured for one of the DF1 protocols The functions dbase setdbase setABConfiguration and getABConfiguration also support DF1 addressing All DF1 addresses are absolute word addresses beginning with the first 16 bit register in the I O database at address 0 and ending at address 11534 TeleBUS DF1 Protocol User and Reference Manual 10 Converting Modbus to
18. m 00001 to 09999 Status registers are also addressed with single bit addresses ranging from 10001 to 19999 Input registers are addressed with 16 bit addresses in the range 30001 to 39999 And holding registers are addressed with a 16 bit address in the range 40001 to 49999 DF1 Addressing DF1 addressing is used by the MSTR ladder logic function when the specified port is configured for one of the DF1 protocols Modbus addressing must be used in all other ladder logic program functions DF1 addressing is used by function master_message when the specified port is configured for one of the DF1 protocols The functions dbase setdbase setABConfiguration and getABConfiguration also support DF1 addressing All DF1 addresses are absolute word addresses beginning with the first 16 bit register in the I O database at address 0 and ending at address 21247 Converting Modbus to DF1 Addresses I O database registers are assigned within the controller s Register Assignment using Modbus addressing When polling the controller from an DF1 device it is necessary to know the DF1 address corresponding to each assigned register In general the cross reference between Modbus and DF1 addressing is shown in the following table DF1 addresses in this table are described in the format word bit where word is the address of a 16 bit word and bit is the bit within that word The bit address is optional TeleBUS DF1 Protocol User and Reference Manual 12 DF1 0 0
19. nded that the application program retry several times before indicating a communication failure TeleBUS DF1 Protocol User and Reference Manual 17 The completion time depends on the length of the message the length of the response the number of transmitted bits per character the transmission baud rate and the maximum message turn around time One to three seconds is usually sufficient Radio systems may require longer delays Polling DF1 PLCs All DF1 PLCs except the PLC 5 VME will support some portion of the basic commands implemented AB PLC Unprotected Unprotected Protected Protected Unprotected Read Write Write Bit Write Bit Write MicroLogi gix y y 1000 sicsoo Y Y Lje jejeje Lje jejeje T Y Y 1774 PLC Lje jeje ier e I E A fess Ea a we A a lacs v v v v v _ peros v ov v v peLcswwe YAA Notes 1 At the protocol level these commands convert and send the slave word address as a byte address The SLC500 5 01 and 5 02 prior to Series C FRN 3 treat this byte address as if it were a word address in the SLC500 This means that the desired word address 2 must be specified for the Slave Register Address in MSTR or master_message Note that this always results in an even starting word address in the slave SLC E g Slave word address of 7 specified in MSTR accesses SLC word address 14 The SLC5 02 5 03 and 5 04 have a status selection bit S 2 8 which al
20. ormation from a remote device Application programs can initiate communication with remote devices A multiple port controller can be a data concentrator for remote devices by polling remote devices on one port and responding as a slave on another port The protocol type communication parameters and station address are configured separately for each serial port on a controller One controller can appear as different stations on different communication networks The port configuration can be set from an application program from the TelePACE programming software or from another Modbus or DF 1 compatible device Compatibility There are four TeleBUS DF1 protocols e The TeleBUS DF1 Full Duplex BCC protocol is compatible with the DF1 Full Duplex data link layer protocol with block check character BCC error checking e The TeleBUS DF1 Full Duplex CRC protocol is compatible with the DF1 Full Duplex data link layer protocol with 16 bit cyclic redundancy check CRC 16 error checking e The TeleBUS DF1 Half Duplex BCC protocol is compatible with the DF1 Half Duplex data link layer protocol with block check character BCC error checking e The TeleBUS DF1 Half Duplex CRC protocol is compatible with the DF1 Half Duplex data link layer protocol with 16 bit cyclic redundancy check CRC 16 error checking Compatibility refers to communication only The protocol defines communication aspects such as commands syntax message framing error handlin
21. rites 16 bit values into any area of the I O database of the slave device Access to the I O database is limited to the unprotected address range of the slave device The data may come from any area of the master I O database within its unprotected address range Any number of 16 bit registers may be written up to the maximum number supported by the slave device or the maximum number above which ever is less The write may start at any 16 bit register provided the entire block is within the unprotected address range of the slave device Sending Messages A master message is initiated in two ways e using the master_message function from a C application program or e using the MSTR function block from a ladder logic program These functions specify the port on which to issue the command the function code the slave station number and the location and size of the data in the slave and master devices The protocol driver independent of the application program receives the response to the command The application program detects the completion of the transaction by e calling the get_protocol_status function in a C application program or e using the output of the MSTR function block in a ladder logic program A communication error has occurred if the slave does not respond within the expected maximum time for the complete command and response The application program is responsible for detecting this condition When errors occur it is recomme
22. s range Bits are accessed one byte at a time and may be written up to the maximum number of bytes The write may start at any byte address provided the entire block is within the protected address range Unprotected Bit Write The Unprotected Bit Write function sets or resets individual bits in any area of the I O database Access to the I O database is limited to the unprotected address range Bits are accessed one byte at a time and may be written up to the maximum number of bytes The write may start at any byte address provided the entire block is within the unprotected address range Unprotected Write The Unprotected Write function writes 8 bit values into any area of the I O database Access to the I O database is limited to the unprotected address range Any number of bytes may be written up to the maximum number The write may start at any byte address provided the entire block is within the unprotected address range TeleBUS DF1 Protocol User and Reference Manual 15 Master Mode The TeleBUS DF 1 protocols may act as a communication master on any serial port In master mode the controller sends commands to other devices on the network Simultaneous master messages may be active on all ports Function Codes The table shows the implemented function codes Note that slave commands at the protocol layer access the I O database in physical byte addresses However in master mode the interface to the TeleBUS DF1 protocol acc
23. ses are shown next to a sample SCADAPack Register Assignment specified with Modbus addresses Register Register Range SCADAPack Lower I O module digital outputs 0 0 to 0 11 digital inputs 256 0 to 256 15 analog inputs 512 to 519 TeleBUS DF1 Protocol User and Reference Manual 11 Pee ace Register Range DIN 5203 4 digital 10017 10019 257 0 to 257 2 inputs DIAG Force LED 10020 10020 2878 SCADAPack 40001 40002 ERE ee to 1537 AOUT module Accessing the I O Database Using ISaGRAF ISaGRAF programs access the I O database through function blocks The function blocks in ISaGRAF may use the Modbus addressing scheme when a Network Address is defined for a variable Refer to the IEC 61131 User Manual for details C language programs access the l O database with two functions The dbase function reads a value from the I O database The setdbase function writes a value to the I O database These functions use either Modbus or DF1 physical addressing Refer to the IEC 61131 User Manual for full details on these functions Modbus Addressing Modbus addressing can be used in ISaGRAF program functions The controller s Register Assignment is also configured using Modbus addresses The C functions dbase and setdbase support Modbus addressing When the specified port is configured for one of the Modbus protocols the function master_message uses Modbus addressing Modbus addresses coil registers with a single bit address ranging fro
24. t section of the I O database Status registers are contained within the DF1 16 bit addresses 256 to 511 For ISaGRAF firmware coil registers are single bits which the protocols can read and write There are 9999 coil registers located in the digital output section of the I O database Coil registers are contained within the DF1 16 bit addresses 0 to 624 For ISaGRAF firmware status registers are single bits which the protocols can read There are 9999 status registers located in the digital input section of the I O database Status registers are contained within the DF1 16 bit addresses 625 to 1249 Coil and status registers are accessed 16 at a time or individually in some commands using a bitmask Writing a one to a bit within the 16 bit address turns the bit on Writing zero to the bit turns the bit off If the register is assigned to an I O module the bit status is written to the module output hardware or parameter Reading a coil or status register returns 1 if the bit is on or 0 if the bit is off The stored value is returned from general purpose registers The I O module point status is returned from assigned registers Input and Holding Registers Input and holding registers contain 16 bit values Input registers are 16 bit registers which the protocol can read For TelePACE firmware there are 1024 input registers located in the analog input section of the I O database Input registers are contained within the DF1 addresses 512 to 1
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