Magelis XBT G & XBT GT
Contents
1. 46 35007086 03 03 2006 Appendix Modbus function codes and exception error codes Modbus function codes Table of Modbus function codes recognized by the XBT G XBT GT Classes Function name Function code hex Basic Read Holding registers 03 Base Write Multiple registers 10 Regular Read Coils 01 Regular Read Discrete Inputs 02 Regular Write Multiple Coils Diagnostic 08 Supplementary services Read Input registers 04 Supplementary services Write Single Coil 05 Supplementary services Write Single register 06 Supplementary services Read Device Identification only for Modbus 2B TC IP with XBT G XBT GT server Note By default the XBT G XBT GT uses the function code 10 FC 10 to write multiple registers However some devices do not know this function code When a device doesn t know FC 10 the XBT G XBT GT will automatically use without any error code FC 06 In the same way the XBT G XBT GT will use FC 05 instead of FC OF In addition FC 06 and FC 05 will be used if Preferred Frame Length is set to Minimum possible 35007086 03 03 2006 47 Appendix Modbus When a client device sends a request to a slave device it expects a normal exception response One of four possible events can occur from the master s query responses e f the slave receives the request without a communication error and can handle the query no2. 32 35007086 03 03 2006 Modbus RTU Driver Equipment Configuration Overview To set up details about the communication process between the target machine and the equipment use the Equipment Configuration dialog box For an overview of the driver and protocol settings see the setting section See Environment Setup p 28 WARNING UNINTENDED EQUIPMENT OPERATION Do not use Modbus addresses 65 126 or 127 if a gateway s Modbus slaves will include a Schneider Electric Speed Variation device such as an Altistart soft starter or an Altivar motor drive The Altistart and Altivar devices reserve these addresses for other communications Failure to follow this instruction can result in death serious injury or equipment damage Note For information on how to display the Equipment Configuration dialog box see the online help Communications gt Setting Up Your Equipment gt Configuring Communications Settings 35007086 03 03 2006 33 34 Modbus RTU Driver Screen example Screen example of Equipment Configuration Equipment Configuration Equipment Address 1 le o mE ble ble Ta Communication Optimization Preferred Frame Length Maximum Possible v IEC61131 Syntax m Variables Double Word word order High word first v ASCII Display byte order Low byte first v
3. 35007086 03 03 2006 Modbus RTU Driver Description Screen description Area Description Equipment Address Enter a value of 1 247 to identify the equipment that the target machine communicates with This value must match the Station Address set up on the equipment Preferred Frame Length To optimize the communication you could choose the Frame length e Maximum Possible the maximum frame length allowed by the server is used optimization is validated e Minimum Possible the request optimization is not used each variable uses a dedicated request 6to252 bytes type a value to determine the Frame length This option is used when some hardware need a specific length Addressing Mode To define the Addressing Mode When using IEC61131 Syntax for most equipment including Premium and Momentum PLCs select 0 based addressing which allows register addresses starting with O e g O to 65535 e When using Quantum equipment select 1 based addressing which allows register addresses starting with 1 e g 1 to 65536 IEC61131 Syntax if checked the IEC variable address syntax is used See Supported Equipment Variable Addresses p 21 M MW MD Double Word word order To define the transmit word order for 32 bit variables See Variable mapping p 24 ASCII Display byte order e Low byte first to have the same behavior as XBT L1000 software e High
4. 35007086 03 03 2006 45 Modbus RTU Note In order for all devices to be able to communicate among themselves on the same bus the speed parity and data bit number characteristics must be identical For further details refer to the documentation of the devices connected to the bus Within the framework of XBT G XBT GT s this information is provided in the section on configuring the Modbus RTU driver Example of a Serial Modbus RTU Communication Bus Ata Glance Schneider devices are used to associate serial Modbus RTU communication buses with stand alone stations enabling them to communicate with XTB G XBT GT operator dialog terminals Examples of The following figures show two examples of serial Modbus RTU buses that can be Buses used with stand alone Premium or Quantum stations LLLI LLLI t nen D por re uii Modbus Modbus m XBT G XBT G XBT GT XBT GT TE S i Tool gr Note XBT G XBT GT is always the bus master
5. gt XBT ZG909 Diagram 23 RS 485 XBT GT series Equipment Target Machine XBT Z908 2 5m 8 20ft Modbus RS 485 Bus 6 Cable TSX m 62 XBT 26909 Subscriber Socket 0 to 2 15 pin connections Diagram 24 RS 485 XBT GT series Target Machine Equipment STBXCA4002 2m 6 56 35007086 03 03 2006 19 Modbus RTU Driver Diagram 25 RS 485 XBT TG series Equipment Target Machine XBT Z9780 2 5m 8 20ft Uni Telway Bus Cable TSX Subscriber Socket 0 to 2 15 pin connections Diagram 26 RS 485 XBT GT series Equipment Target Machine XBT 2968 2 5m 8 20ft Uni Telway Bus Cable XBT 70939 TSX PACC01 Subscriber Socket 0 to 2 15 pin connections 20 35007086 03 03 2006 Modbus RTU Driver Supported Equipment Variable Addresses Overview The following table lists the equipment variable address ranges you can enter from the Equipment Address keypad For actual equipment variable address ranges supported by the equipment refer to the corresponding manual Note if you have selected the IEC61131 check box in the Equipment Configuration window See Equipment Configuration p 33 you could use the IEC syntax to access variables If not you could use the State RAM syntax 35007086 03 03 2006 21 Modbus RTU Driver IEC Equipment variable addre
6. Any Modbus TSX SCA 62 RS 485 Comi Cable Equipment Socket subscriber SUb D25 XBT ZG999 Diagram 4 Modelbus Hub RS 485 Com1 Cable LU9GC3 SUb D25 XBT ZG999 Diagram 8 10 35007086 03 03 2006 Modbus RTU Driver Note connect XBT G XBT GT to TSX SCG116 use XBT ZG999 XBT 2928 connect XBT G XBT GT to TSX17 use XBT ZG999 XBT 2917 e Toconnect XBT G XBT GT to V4 CPU through TSXLES64 74 use XBT ZG999 XBT Z948 on HE13 14 35007086 03 03 2006 11 Modbus RTU Driver Connection The following table describes the basic system setup for connecting the target XBT GT1000 machine to Modbus RTU equipment series Protocol CPU Link I F Comm Format XBT GT Diagram Connector Modbus RTU Twido Modbus Slave auxiliary RS 485 Com1 RJ45 Cable Diagram 10 terminal port TWDNOZ485D TWDNAC485D Micro Modbus Slave auxiliary RS 485 Com1 RJ45 Cable Diagram 10 terminal port Momentum CPU s RS 232C Com1 RJ45 Cable diagram 16 Modbus port XBT ZG939 TSX57 SCY2160 RS 485 Com1 RJ45 Cable diagram 14 PremiumTSX57 D Sub25 XBT ZG939 Premium UNITY scy2160 RS 485 Comi RJ45 Cable Diagram 15 SCP114 TESys Zelio SR3 RJ45 RS 485 Com1 RJ45 Cable Diagram 12 MBUO1BD ATV Advantys HE13 RS 232C Com1 RJ45 Diagram 17 Any Modbus Modbus HUB RS 485 Com1 RJ45 Cable Diagram 11 Equipment Modbus T Cable Diagram 15 SCA62 Socket Cable Diagram 13 Su
7. This document is not intended as an instruction manual for untrained persons O 2005 Schneider Electric All Rights Reserved 35007086 03 03 2006 About the Book Ata Glance Document Scope This documentation presents Modbus RTU driver for Magelis XBT G amp XBT GT Related Documents Title of Documentation Reference Number Vijeo Designer User manual Included in the Vijeo Designer CDROM Vijeo Designer Tutorial Included in the Vijeo Designer CDROM Magelis XBT G Modbus TCP IP driver Included in the Vijeo Designer CDROM Magelis XBT G Modbus Plus driver Included in the Vijeo Designer CDROM 35007086 03 03 2006 7 About the Book Product Related Warnings A WARNING LOSS OF CONTROL e The designer of any control scheme must consider the potential failure modes of control paths and for certain critical control functions provide a means to achieve a safe state during and after a path failure Examples of critical control functions are emergency stop and overtravel stop e Separate or redundant control paths must be provided for critical control functions e System control paths may include communication links Consideration must be given to the implications of unanticipated transmission delays or failures of the link e Each implementation of Magelis XBT G and XBT GT must be individually and thoroughly tested for proper operation before being placed into service
8. got 65535 6 65529 Note The two areas 10000 and 30000 are not accessible with the IEC syntax 35007086 03 03 2006 25 Modbus RTU Driver Consecutive Equipment Addresses Overview The following table lists the maximum number of consecutive addresses that can be read for each type of supported equipment Refer to this table when using block transfers The Maximum Consecutive Address and Gap Span depend on the Preferred Frame Length you define in the Equipment Configuration dialog box See Equipment Configuration p 33 The Gap Span is calculated as the number of unused words between two variables addresses When two variable address on the same equipment are closer than the Gap Span value they are read in the same request if the request length is less than the configured one In other cases they are read in two distinct requests e To speed up data communication use consecutive variable addresses on the same panel screen e Thefollowing situations increase the number of times that the equipment is read and reduces the data communication speed between the target machine and the Modbus equipment e when the number of consecutive addresses exceeds the maximum e when an address is designated for division e when different equipment types are used A WARNING UNINTENDED EQUIPMENT OPERATION Set the preferred frame length to a value at least equal to the largest expected variable l
9. machine for connecting to the equipment Serial Interface Defines the serial connection See Cable Diagrams p 14 for the selected COM Port RS 232C or RS 485 for COM1 or RS 232C fixed for COM2 Flow Control Set to None the driver handles flow control internally Transmission Speed Sets the communication speed in bits per second This setting must match the equipment baud rate Retry Count Defines the number of times the driver tries to send or receive data when there is an error Parity Bit Sets a parity bit Even or Odd for use in detecting communication errors or None Stop Bit Defines the stop bit 1 or 2 bits Data Length Defines the length of each unit of data 7 bit or 8 bit Rcv Timeout Defines the length of time the target machine waits for a response before it generates a timeout error or sends another communication request TX Wait Time Defines the number of milliseconds that the target machine waits after receiving a communication packet before sending a new request Minimum TX Wait Time is at least 3 5 character time Note this parameter is automatically changed by the software to be consistent with the tranmission speed However you could change it to increase its value manually Default value When selected TX Wait Time is automatically updated to the transmission duration of 3 5 characters When Cleared you will need to specify the TX Wait Time
10. 1 bit Data Length 8 bits Rev Time out 10s TX Wait Time 2 ms Default value 2 ms checked Default value Checkbox selected Mode Data Bits RTU 8 Equipment settings Target Machine Settings Equipment Settings Equipment No 1 Station Address 1 Preferred Frame Length Minimum Possible for equipment which does not have continuous registers Altivar products for instance and Maximum Possible for the others IEC61131 Syntax Selected by Default use it for Premium PLCs and unchecked it for Quantum PLCs Double Word word order Low word first for Premium PLCs High word first for Quantum PLCs ASCII display byte order Low byte first for Premium PLCs or to have the same behavior as XBTL1000 High byte first for Quantum PLCs or to have the same behavior as Vijeo Designer V4 1 35007086 03 03 2006 29 Modbus RTU Driver I O Manager Configuration Overview Screen example The driver and equipment which enable communication between the target machine and the equipment depends on the equipment type Note For information on how to display the New Driver Interface dialog box or for details about the I O Manager see the online help Communications gt Setting Up Your Equipment gt Adding a Device Driver Screen example of I O Manager Configuration New Driver Interface x Manufacturer Schneider Electri
11. 31 Equipment Configuration 33 Equipment Variable Address Configuration 36 35007086 03 03 2006 Modbus RTU Driver System Structure Overview The following table describes tested system configurations for connecting target machines with Modbus RTU equipment To view a cable connection diagram for a particular communication format see the Cable diagrams section See Cable Diagrams p 14 Connection The following table describes the basic system setup for connecting the target XBT G machine to Modbus RTU equipment Protocol CPU Link I F Comm Format XBT G Connector Diagram Modbus RTU Twido Slave Modbus Slave RS 485 19200 Com1 D Sub25 Cable address 1 auxiliary terminal port Data 8 parity XBT ZG999 Diagram 1 none Stop bit 1 Com2 Cable D Sub 9 diagram 3 Twido Slave TWDNOZ485D RS 485 Comi Cable address 1 to 247 TWDNAC485D SUb D25 XBT ZG999 diagram 1 Com2 Cable D Sub 9 diagram 3 TSX37 Micro Modbus Slave RS 485 Com1 Cable auxiliary terminal port SUb D25 XBT ZG999 Diagram 5 Quantum CPU S Modbus port RS 232C Com1 Cable Sub D9 SUb D25 XBT ZG999 Diagram 2 Momentum CPU s Modbus port RS 232C Com1 Cable RJ45 SUb D25 XBT ZG999 Diagram 2 TSX57 Premium SCY2160 RS 485 Comi Cable SUb D25 XBT ZG999 Diagram 6 TESys Zelio RJ45 RS 485 Comi Cable SR3MBUO1BD SUb D25 XBT ZG999 Diagram 8 Advantys STB HE connector on NIM RS 232C Com2 Cable Sub D9 Diagram 7
12. 35007086 03 a brand of Schneider Electric Magelis XBT G amp XBT GT Modbus RTU driver eng Telemecanique Table of Contents Chapter 1 Chapter 2 Chapter 3 Safety Information 5 About the 7 Modbus RTU 9 Ata Gane sei Le ideados vede 9 System Structure xdi bx e A CH EA IRA 10 Cable Diagrams 2 2 CE TUMOR EMO DOW eq 14 Supported Equipment Variable 55 5 21 Consecutive Equipment Addresses 26 Environment 28 I O Manager Configuration 30 Driver Configuration 31 Equipment 33 Equipment Variable Address Configuration 36 Modbus RTU Communication General Principles 41 O s CR NO ties Acid 41 General P T 42 Operating 44 Example of a Serial Modbus RTU Communication Bus 46 Appendix eek ERR ERU eR RR bus ee 47 Modbus function codes and exception error 47 Ves DAL a boca A A EE 51 Safety
13. Failure to follow this instruction can result in death serious injury or equipment damage For additional information refer to NEMA ICS 1 1 latest edition Safety Guidelines for the Application Installation and Maintenance of Solid State Control and to NEMA ICS 7 1 latest edition Safety Standards for Construction and Guide for Selection Installation and Operation of Adjustable Speed Drive Systems User Comments We welcome your comments about this document You can reach us by e mail at techpub O schneider electric com 8 35007086 03 03 2006 Modbus RTU Driver Ata Glance Subject of this chapter What s in this Chapter This chapter explains how to connect the target machine with Modbus RTU equipment For information about how to use the Vijeo Designer software please refer to the Vijeo Designer Online Help The types of target machines that are compatible with Vijeo Designer depends on the version of Vijeo Designer For information about the compatibility of target machines please refer to the Vijeo Designer Online or User Manual help Note target machines mean Magelis XBT G XBT GT products This chapter contains the following topics Topic Page System Structure 10 Cable Diagrams 14 Supported Equipment Variable Addresses 21 Consecutive Equipment Addresses 26 Environment Setup 28 1 0 Manager Configuration 30 Driver Configuration
14. Information Important Information NOTICE Read these instructions carefully and look at the equipment to become familiar with the device before trying to install operate or maintain it The following special messages may appear throughout this documentation or on the equipment to warn of potential hazards or to call attention to information that clarifies or simplifies a procedure The addition of this symbol to a Danger or Warning safety label indicates A that an electrical hazard exists which will result in personal injury if the instructions are not followed This is the safety alert symbol It is used to alert you to potential personal injury hazards Obey all safety messages that follow this symbol to avoid possible injury or death A DANGER DANGER indicates an imminently hazardous situation which if not avoided will result in death serious injury or equipment damage A WARNING WARNING indicates a potentially hazardous situation which if not avoided can result in death serious injury or equipment damage A CAUTION CAUTION indicates a potentially hazardous situation which if not avoided can result in injury or equipment damage 35007086 03 03 2006 Safety Information PLEASE NOTE Electrical equipment should be serviced only by qualified personnel No responsibility is assumed by Schneider Electric for any consequences arising out of the use of this material
15. Third word e If Low byte first Equipment Configuration See Equipment Configuration 33 option is selected the string displayed on the XBT G XBT GT screen is HELLO e If High byte first Equipment Configuration See Equipment Configuration p 33 option is selected the string displayed on the XBT G BT GT screen is EHLL O IEC eguivalences The following table gives the eguivalences between the Modbus syntax and the IEC61131 syntax Variable Type Modbus address syntax IEC61131 syntax Format Range First element Format Range First element Internal coils and Output coils 00001 i i 0 to 65535 00001 1 Mi i 0 to 65535 M0 Holding register word 40001 i i 0 to 65535 40001 MWi i 0 to 65535 MWO Holding register word bit 40001 i j i 0 to 65535 40001 0 MWi Xj i 0 to 65535 MWO X0 2 j 0 to 15 j 0 to 15 Holding register double word 40001 i 1 0 to 65534 40001 MDI i 0 to 65534 MDO Holding register float 40001 i i 0 to 65534 40001 MFi i 0 to 65534 MFO Holding register string 40001 i i 0 to k 3 40001 MWi i 0 to k 3 MWO legend 1 Leading zeros 00001 must be preserved 2 j is a bit index with the following convention 0 for the least significant bit and 15 for the most significant bit 3 k is equal to 65535 string length 2 rounded to the upper value For instance with a 11 characters string we ve
16. arget Machine Equipment 1 XBT Z918 2 5m 8 20ft a XBT 20999 Adapter connects to 1 Diagram7 XBTG RS 232C series Target Machine Equipment XBT XCA4002 6 561 q connects to COM2 35007086 03 03 2006 15 Modbus RTU Driver Diagram 8 XBT G series Equipment Target Machine XBT Z938 V2 2 5m B 20ft LU9GC3 Note For point to point connection connect the XBT Z to the RJ45 equipment s connector Diagram 8 is using RS485 2 Wires bus For the XBT Z938 V2 make sure that this exact reference is written on the cable Diagram 10 RS 485 XBT GT series Target Machine Equipment XBT 29780 2 5m 8 20ft Connect to RJ45 Diagram 11 RS 485 XBT GT series Equipment Target Machine VW3A8306R10 1m 3 28ft Connect to Com 1 RJ45 LU9GC3 Diagram 12 RS 485 XBT GT series Target Machine Equipment VW3A8306R10 1m 3 28ft 16 35007086 03 03 2006 Modbus RTU Driver Diagram 13 RS 485 XBT GT series Target Machine r 2 Modb
17. bscriber 12 35007086 03 03 2006 Modbus RTU Driver Connection The following table describes the basic system setup for connecting the target XBT GT2000 machine to Modbus RTU equipment series Protocol CPU Link I F Comm XBT GT Connector Diagram Format Modbus RTU Twido Modbus Slave auxiliary RS 485 Com2 RJ45 Cable Diagram 10 terminal port Com1 D Sub D9 Cable diagram 18 TWDNOZ485D XBT ZG909 TWDNAC485D Micro Modbus Slave auxiliary RS 485 Com2 RJ45 Cable diagram 25 terminal port Com1 D Sub D9 Cable diagram 26 XBT ZG909 Quantum CPU S Modbus port Sub D9 RS 232C Com1 D Sub D9 Cable Diagram 19 XBT ZG919 Momentum CPU s Modbus port RS 232C Com1 D Sub D9 Cable Diagram 21 XBT ZG999 Premium SCY2160 RS 485 2 RJ45 Cable Diagram 14 XBT ZG939 Com1 D Sub D9 Cable Diagram 22 XBT ZG909 TESys Zelio RJ45 RS 485 Com2 RJ45 Cable Diagram 12 SR3MBUO1BD Com1 D Sub9 Cable Diagram 20 XBT ZG909 Advantys HE13 RS 232C Com1 D Sub D9 Cable Diagram 24 Any Modbus Modbus HUB RS 485 2 RJ45 Cable Diagram 11 Equipment TSXPACCO1 Socket Cable diagram 15 subscriber Cable diagram 13 Modbus T TSXSCA62 Socket RS 485 1 D Sub D9 Cable Diagram 23 subscriber XBT ZG909 35007086 03 03 2006 Modbus RTU Driver Cable Diagrams Overview Schneider Electric recommends using the connection schemes in t
18. bus RTU Driver Non IEC The following table lists the equipment variable address range if you haven t Equipment selected the IEC 61131 check box variable address range Variable Bit Address Word Address Note Coils C 00001 65536 Read Write access Discrete Inputs 10001 165536 Read only Single word Input 30001 0 65536 15 30001 365536 Read only Registers Single word 40001 0 465536 15 40001 465536 Read Write access When you write to one of these bit Holding Registers addresses the target machine reads the entire word address sets the defined bit then returns the new word address to the PLC If the ladder program writes data to this word address during the bit read write process the resulting data may be incorrect Double word Input 30001 0 65536 15 30001 365535 Read only Registers To fit with equipment variable coding the most significant byte could be chosen by the software See Equipment Configuration p 33 Double word 40001 0 465536 15 40001 465535 Rea Write access Holding Registers To fit with equipment variable coding the most significant byte could be chosen by the software See Equipment Configuration p 33 35007086 03 03 2006 23 Modbus RTU Driver Variable mapping A CAUTION INVALID DISPLAY VALUES If the word byte order or the double word word order set in the XBT G XBT GT are different than the equip
19. byte first to have the same behavior as Vijeo Designer V4 1 software Inside PLCs a STRING is usually an array of words for which every word contains two characters one character per byte For example the HELLO string representation is the following Word order Most significant byte Least significant byte First word E H Second word j L Third word e If Low byte first option is selected the string displayed on the XBT G BT GT screen is HELLO e If High byte first option is selected the string displayed on the XBT G BT GT screen is EHLL O 35007086 03 03 2006 35 Modbus RTU Driver Equipment Variable Address Configuration Overview To define an equipment address for a variable See Supported Equipment Variable Addresses p 21 in the Variable List use the Equipment Address Keypad from the variable properties Note To display the Equipment Address Keypad click on the button Screen example 1 Screen example of Equipment Address Configuration without IEC box checked Modbus RTU Address 400011 v Offset i 8433 Preview 48434 2 Bit 2 v Cancel Help 36 35007086 03 03 2006 Modbus RTU Driver Description Screen description Area Description Address Choose the start address Offset i Define the offset of the equipment s discrete and word equipment
20. c Industries SAS v Driver Equipment Modbus RTU Modbus Equipment Modbus Plus Modbus TCP IP Uni Telway Cancel 30 35007086 03 03 2006 Modbus RTU Driver Driver Configuration Overview Screen example To configure the communication settings of the serial driver in the target machine use the Driver Configuration dialog box Make sure the settings match those of the Modbus equipment See Environment Setup p 28 Note For information on how to display the Driver Configuration dialog box see the online help Communications gt Setting Up Your Equipment gt Configuring Communications Settings Screen example of Driver Configuration Driver Configuration Manufacturer Schneider Electric industries SAS COM Port Serial Interface Flow Control Retry Count COM1 v RS 485 v None v Transmission Speed 19200 v 2 Driver Modbus RTU Parity Bit Even v Data Length 8 v Rev Time Out 3 m Sec TX Wait Time 2 mSec Default value Na Cancel Help 35007086 03 03 2006 31 Modbus RTU Driver Description Screen description Area Description Manufacturer Displays the name of the Equipment manufacturer Interface Displays the type of serial connection used to connect the target machine to the Modbus equipment COM Port Defines which COM port to use on the target
21. e the address type M MW MD Offset i Define the offset of the equipment s discrete and word equipment types Type the offset or use the Address Selector keypad to enter the offset Address Selector x 00000 Clear Aa EB EE 4 5 6 C TE SA 0 Del BackSpace Cancel D B Bit j List the bit position 0 15 of the equipment s discrete and word equipment types Example let s look at a MW10 the value of 5 is loaded MW10 5 In Binary MW10 0000 0000 0000 0101 16 bits assume Least Significant Bit LSB is far right and this is j 0 So MW10 Xj j 0 the bit is 1 j 1 the bitis 0 j 2 the bit is 1 j 3 the bit is 0 j 4 the bit is 0 and so on Preview Typing the offset or the Bit allows you to preview the address immediately Using the Address selector updates the Preview after you click OK Note Be careful when you send STRING as table of word on Modbus See Variable mapping p 24 because each word LSB and MSB are inverted between Quantum and Premium PLC 35007086 03 03 2006 39 Modbus RTU Driver 40 35007086 03 03 2006 Modbus RTU Communication General Principles 2 Ata Glance Subject of this This chapter presents the Modbus RTU communication protocol used by the XBT G Chapter XBT GT terminals and configurable using Vijeo Designer What s in thi
22. eed a request with offset 96 and length 5 will generate exception 02 03 ILLEGAL DATA A value contained in the query data field is not an allowable value for server or slave VALUE This indicates a fault in the structure of the remainder of a complex request such as that the implied length is incorrect It specifically does NOT mean that a data item submitted for storage in a register has a value outside the expectation of the application program since the MODBUS protocol is unaware of the significance of any particular value of any particular register 04 SLAVE DEVICE An unrecoverable error occurred while the server or slave was attempting to perform FAILURE the requested action 05 ACKNOWLEDGE Specialized use in conjunction with programming commands The server or slave has accepted the request and is processing it but a long duration of time will be required to do so This response is returned to prevent a time out error from occurring in the client or master The client or master can next issue a Poll Program Complete message to determine if processing is completed 06 SLAVE DEVICE Specialized use in conjunction with programming commands The server or slave is BUSY engaged in processing a long duration program command The client or master should retransmit the message later when the server or slave is free 48 35007086 03 03 2006 Appendix Code Name Meani
23. ength If the Preferred Frame Length is less than the variable length read or write errors may occur Failure to follow this instruction can result in death serious injury or equipment damage Note If the minimum value is selected for the Preferred Frame Length to read double words you need to e link the two consecutive addresses of the double word 32 bits variable to two XBT G XBT GT 16 bit variable e create a double word 32 bit variable in the XBT G XBT GT e create a script for each 16 bit variables which updates the 32 bit variable with the contents of the two 16 bit variables every time the 16 bit variable changes 26 35007086 03 03 2006 Modbus RTU Driver Consecutive The following table lists the maximum number of consecutive addresses that can be addresses read for each type of equipment when Preferred Frame Length Maximum Possible 252 bytes Equipment Max consecutive addresses Gap Span Coils 2000 bits 127 bits Discrete Inputs Input Registers 125 words 24 words Holding Registers The following table lists the maximum number of consecutive addresses that can be read for each equipment when Preferred Frame Length user defined value from 6 to 252 Equipment Max consecutive addresses Gap Span Coils Preferred Frame Length x 16 or 2000 Bits whichever is less 127 bits Discrete Inputs Input Registers Preferred Frame Length 2 2 24
24. he following diagrams as specified in the preceding connection tables e Ground the equipment and the terminal according to your country s applicable standard For details refer to the equipment manual Diagram1XBTG RS 485 series Target Machine Equipment XBT 2968 2 5m 8 20ft 4 XBT Z9681 5m 16 25ft 7 Cable XBT ZG999 Adapter connects to COM1 Diagram2XBTG RS 232C series Target Machine XBT Z9710 2 5m 8 20ft for Quantum Equipment XBT 29711 3m 9 84ft 4 for Momentum 1 Cable XBT ZG999 Adapter connects to COM1 Diagram G RS 485 series Target Machine Equipment TSXPCX1031 2 5m 8 20ft Cable Twido TER Direct Mode Micro Other Direct Mode connects to COM2 14 35007086 03 03 2006 Modbus RTU Driver Diagram 4XBT G RS 485 series Equipment Target Machine XBT Z908 2 5m 8 20ft i Cable XBT 20999 Adapter TSX SCA 62 Subscriber Socket connects 1o COMI 0 to 2 15 pin connections Modbus RS 485 Bus Diagram 5 G RS 485 series Equipment Target Machine XBT Z968 2 5m 8 20ft e Cable XBT ZG999 Adapter connects to COM1 TSX P ACC 01 Subscriber Socket 1 to 3 mini din connections Diagram6XBTG RS 485 series T
25. ment order the displayed values on the XBT G XB GT will be wrong Select for the XBT G XBT GT the same configuration than the equipment Failure to follow this instruction can result in injury or equipment damage The word 16 bit is managed as follows e least significant byte n e most significant byte n 1 Check that the connected equipment uses the same format The double word word 32 bit is managed as follows If the high word first Equipment Configuration See Equipment Configuration D 33 option is selected e most significant 2 word n e least significant 2 word n 1 Check that the connected equipment uses the same format 16 bit and 32 bit data High and Low example 16 bit 32 bit Byte Word of 7 0 L Low 0 L Low 1 15 8 H High 1 H High Note If Low word first Equipment Configuration See Equipment Configuration p 33 is selected the most significant word and the least significant word are inverted For example to be consistent with Premium PLC format use the value Low word first 24 35007086 03 03 2006 Modbus RTU Driver The STRING is managed as follows Inside PLCs a STRING is usually an array of words for which every word contains two characters one character per byte For example the HELLO string represen tation is the following Word order Most significant byte Least significant byte First word E H Second word L L
26. ng 08 MEMORY PARITY Specialized use in conjunction with function codes 20 and 21 and reference type 6 to ERROR indicate that the extended file area failed to pass a consistency check The server or slave attempted to read record file but detected a parity error in the memory The client or master can retry the request but service may be required on the server or slave device GATEWAY PATH Specialized use in conjunction with gateways indicates that the gateway was unable to UNAVAILABLE allocate an internal communication path from the input port to the output port for processing the request Usually means that the gateway is misconfigured or overloaded GATEWAY TARGET Specialized use in conjunction with gateways indicates that no response was obtained DEVICE FAILED TO from the target device Usually means that the device is not present on the network RESPOND 35007086 03 03 2006 49 Appendix 50 35007086 03 03 2006 Index M Modbus exception error codes 47 Modbus function codes 47 S System XBT G connection 10 System structure 10 35007086 03 03 2006 51 Index 52 35007086 03 03 2006
27. on shows a communication architecture featuring a serial Example Modbus RTU bus Unity Pro PL7 0 A TL E er e wall S rtt mme B FEGE C Ethernet sub network Gateway DE gt ol e Ue o On jo eA ae Ethernet sub network 55 E wel go ER gt OU Modbus RTU XBT G XBT GT Modbus master 00 005 IS IS ES Tu Sls 35007086 03 03 2006 43 Modbus RTU Operating Principle Ata Glance Illustration Communication between same type devices can only take place by defining interconnection standards that define the behavior of each device in relation to the others These standards were developed by ISO the International Standard Organization which defined a standardized Network Architecture more commonly known as the OSI Open System Interconnection model This model is made up of seven ranked layers that each perform a specific part of the functi
28. ons necessary for interconnecting systems The layers communicate with equivalent layers from other devices via standardized protocols Within a single device layers communicate with their immediate neighbors via hardware or software interfaces The figure below describes the layers of the OSI model Device 1 Device 2 Information processing layers 3 Network Communication layers 2 Link 1 Physical Physical interconnection support Note The Modbus RTU bus matches this model in terms of layers without possessing all of them Only the Application Modbus Network Link and Physical Modbus RTU layers are necessary for this field bus 44 35007086 03 03 2006 Modbus RTU Application Layer Link Layer Physical Layer The application layer of the RTU Modbus serial field bus is the one visible to the programs of the interconnected devices This is used to formulate the requests reading writing words and bits etc that will be sent to the remote device The Application layer used by the Modbus RTU bus is the Modbus application protocol Example an XBT G XBT GT connected to a Modbus RTU bus as master will send Modbus requests in order to update the graphic objects displayed on these pages Note For further details on the Modbus application protocol request codes class details etc go to http www modbus org The link layer of the serial Modbus RTU bus uses the Mas
29. rmally it returns a normal response e Ifthe slave does not receive the request due to a communication error no response is returned The client program will eventually process a time out condition for the request e Ifthe slave receives the request but detects a communication error parity LRC CRC no response is returned The client program will eventually process a time out condition for the request e f the slave receives the request without a communication error but cannot handle it for example if the request is to read a non existent output or register the server will return an exception response informing the client of the nature of the error Table of Modbus Exception responses Code Name Meaning 01 ILLEGAL FUNCTION The function code received in the query is not an allowable action for the server or slave This may be because the function code is only applicable to newer devices and was not implemented in the unit selected It could also indicate that the server or slave is in the wrong state to process a request of this type for example because it is unconfigured and is being asked to return register values 02 ILLEGAL DATA The data address received in the query is not an allowable address for the server or ADDRESS slave More specifically the combination of reference number and transfer length is invalid For a controller with 100 registers a request with offset 96 and length 4 would succ
30. s This chapter contains the following topics Chapter Topic Page General 42 Operating Principle 44 Example of a Serial Modbus RTU Communication Bus 46 35007086 03 03 2006 41 Modbus RTU General Ata Glance Modbus RTU is a field bus used to communicate between devices of the same type according to a protocol defined by Modicon Numerous proprietary or third party devices can be used on this bus which has become one of the industry standards The communication protocol terminology defines the software driver installed in the devices that are connected to the Modbus RTU bus This section gives a brief description of the principles of the communication bus Illustration The following illustration shows the position of the field buses in an industrial communication environment Function Computer networks Local industrial networks Process control Field bus Sensor actuator bus Machine control Transmission needs Short messages Long messages Low response time Higher response time 42 35007086 03 03 2006 Modbus RTU Architecture The following illustrati
31. ss range A WARNING UNINTENDED EQUIPMENT OPERATION Consider possible conflicts between the XBT G XBT GT and PLC program attempting to simultaneously write the same register and design your system to avoid these conflicting write operations Do not allow your programs or other devices to write 16 bit word values to registers being accessed in a bitwise manner Failure to follow this instruction can result in death serious injury or equipment damage The following table lists the equipment variable address range if you have selected the IEC 61131 check box Variable Bit Address Word Address Note Mi i 0 to 65535 Read Write access MWi Xj i 0 to 65535 j 0 to 15 jis a bit index with the following convention 0 for the least significant bit and 15 for the most significant bit Read Write access When you write to one of these bit addresses the target machine reads the entire word sets the defined bit then returns the new word address to the PLC If the ladder program writes data to this word value during the bit read write process the resulting data may be incorrect MWi i 0 to 65535 Read Write access MDi i 0 to 65534 MFi i 0 to 65534 Read Write access To fit with equipment variable coding the most significant byte could be chosen by the software See Equipment Configuration p 33 22 35007086 03 03 2006 Mod
32. ter Slave communication principle The principle of a link layer is to define a low level communication method for the communication medium physical layer For the serial Modbus RTU bus the Master Slave method comprises polling slaves interrogating each slave on the bus via the master to find out if they have a message to send When a slave has a message to send it answers the master which then gives it authorization to send its message For each serial Modbus RTU bus there must be a single master that controls the bus slaves Note One reason for Master Slave management is that at any time it is possible to calculate transfer time for requests and the answers from each device This therefore enables us to size the buses precisely in order that there be no saturation or information loss Note XBT G XBT GT is always the bus master Note For further details datagrams frame sizes etc go to http www modbus org The physical layer of the OSI model characterizes the topology of the communication bus or network as well as the medium cable wire fiber optic etc that will transport the information and its electrical coding Within the framework of a serial Modbus RTU bus topology may be daisy chained derived or a mix of both The medium is made up of shielded twisted pairs and the signal is a base band signal with a default speed of 9600 bits per second even parity 8 data bits and 1 stop bit
33. types Type the offset or use the Address Selector keypad to enter the offset Address Selector x 00000 Clear ER BIE 2 58 12 B ll AE 0 Del BackSpace Cancel Bit j List the bit position 0 15 of the equipment s discrete and word equipment types Example let s look at a register 40100 and assume the value of 5 is loaded 40100 5 In Binary 40100 0000 0000 0000 0101 16 bits assume Least Significant Bit LSB is far right and this is 0 So 40001 i j where i 99 and j 0 the bit is 1 j 1 the bitis O j 2 the bit is 1 j 3 the bit is 0 j 4 the bit is O and so on Preview Typing the offset or the Bit allows you to preview the address immediately Using the Address selector updates the Preview after you click OK Note Be careful when you send STRING as table of word on Modbus See Variable mapping p 24 because each word LSB and MSB are inverted between Quantum and Premium PLC 35007086 03 03 2006 37 Modbus RTU Driver Screen example 2 Screen example of Equipment Address Configuration whith IEC box checked Address Offset i Bit j Modbus RTU MWi v 12 y Preview MW00012 X14 Cancel Help 38 35007086 03 03 2006 Modbus RTU Driver Description Screen description Area Description Address Choos
34. us Network VW3A8306TF10 1m 3 28ft 1 Modbus T Diagram 14 RS 485 XBT GT series Target Machine Equipment XBT Z918 2 5m 8 20ft M 1h XBT 20939 Diagram 15 RS 485 XBT GT series Equipment Target Machine VW3A8306 3m 9 84ft Modbus RS 485 Bus Cable TSX do 62 Subscriber Socket 0 to 2 15 pin connections Diagram 16 RS 485 XBT GT series Target Machine Equipment XBT Z9711 3m 9 84ft gt gt XBT ZG939 35007086 03 03 2006 17 Modbus RTU Driver Diagram 17 RS 485 XBT GT series Target Machine Equipment XBT Z988 2 5m 8 20ft L e XBT t Diagram 18 RS 485 XBT GT series Target Machine Equipment XBT 2968 2 5 8 20ft EM Se Diagram 19 RS 485 XBT GT series Target Machine Equipment m XBT 29710 2 5m 8 20ft ER XBT m Diagram 20 RS 485 XBT GT series Target Machine Equipment m XBT 2938 2 5m 8 20ft XBT 26909 18 35007086 03 03 2006 Modbus RTU Driver Diagram 21 RS 485 XBT GT series Target Machine Equipment AM KK XBT 20919 Diagram 22 RS 485 XBT GT series Target Machine Equipment EAM
35. words Holding Registers Note When Preferred Frame Length Minimum Possible the max consecutive addresses is 1 for bits and words 35007086 03 03 2006 27 Modbus RTU Driver Environment Setup Overview RS 485 settings The following table lists the communication settings recommended by Schneider Electric for the target machine and Modbus equipment For details see Driver section See Driver Configuration p 31 and Equipment section See Equipment Configuration p 33 Driver settings Target Machine Settings Equipment Settings Driver Interface Serial Interface RS 485 Connection Format RS 485 Flow Control None Wrapping Speed 19200 bps Baud Rate 19200 bps Retry Count 2 Parity Bit Even Parity Bit Even Stop Bit 1 bit Stop Bit 1 bit Data Length 8 bit Rev Time Out 3s TX Wait Time 2 ms Default value 2 ms checked Default value Checkbox selected Mode Data Bits RTU 8 28 35007086 03 03 2006 Modbus RTU Driver RS 232C settings Equipment Driver settings Target Machine Equipment Settings Driver Serial Interface RS 232C Connection Format RS 232C interface Flow Control DTR ER CTS Wrapping Speed 19200 bps Baud Rate 19200 bps Retry Count 2 Parity Bit Even Parity Bit Even Stop Bit 1 bit Stop Bit
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