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Contents
1. Before you begin___________________________________________________________________________________________ 3
2. Documentation structure_____________________________________________________________________________________ 4
3. Introduction_______________________________________________________________________________________________ 5
3. 1. Presentation _________________________________________________________________________________________ 5
3. 2. Notation ____________________________________________________________________________________________ 5
4. Hardware setup ___________________________________________________________________________________________ 6
4. 1. Receipt _____________________________________________________________________________________________ 6
4. 2. Hardware description __________________________________________________________________________________ 6
4. 3. Installing the card in the drive____________________________________________________________________________ 6
4. 4. Switch coding ________________________________________________________________________________________ 7
5. Connecting to the bus_______________________________________________________________________________________ 9
5. 1. Wiring recommendations _______________________________________________________________________________ 9
5. 2. Modbus RS485 standard _______________________________________________________________________________ 9
5. 3. Connection via RJ45 wiring system ______________________________________________________________________ 10
5. 4. Connection via junction boxes __________________________________________________________________________ 12
6. Configuration ____________________________________________________________________________________________ 14
6. 1. Communication parameters ____________________________________________________________________________ 14
6. 2. Control - Command __________________________________________________________________________________ 15
6. 3. Communication scanner_______________________________________________________________________________ 18
6. 4. Communication faults _________________________________________________________________________________ 19
6. 5. Monitored parameters_________________________________________________________________________________ 20
7. Diagnostics______________________________________________________________________________________________ 21
7. 1. Checking the address_________________________________________________________________________________ 21
7. 2. LEDs______________________________________________________________________________________________ 21
7. 3. Control - Command __________________________________________________________________________________ 22
7. 4. Communication scanner_______________________________________________________________________________ 23
7. 5. Communication fault__________________________________________________________________________________ 24
7. 6. Card fault __________________________________________________________________________________________ 24
8. Modbus protocol__________________________________________________________________________________________ 25
8. 1. Principle ___________________________________________________________________________________________ 25
8. 2. Modes_____________________________________________________________________________________________ 26
8. 3. Modbus functions available ____________________________________________________________________________ 27
8. 4. Read Holding/Input Registers (3/4) ______________________________________________________________________ 27
8. 5. Write Single Register (6)_______________________________________________________________________________ 28
8. 6. Diagnostics (8) ______________________________________________________________________________________ 29
8. 7. Get Comm Event Counter (11 = 16#0B) __________________________________________________________________ 30
8. 8. Write Multiple Registers (16 = 16#10) ____________________________________________________________________ 30
8. 9. Read/Write Multiple Registers (23 = 16#17)________________________________________________________________ 31
8. 10. Read Device Identification (43 = 16#2B) _________________________________________________________________ 32
8. 11. Communication scanner______________________________________________________________________________ 34
8. 12. Exception responses ________________________________________________________________________________ 37
8. 13. Read non-existent or protected parameters_______________________________________________________________ 38
9. Appendix________________________________________________________________________________________________ 39
9. 1. RS485 standard _____________________________________________________________________________________ 39
9. 2. Modbus 2-wire standard schematic ______________________________________________________________________ 40
9. 3. Modbus 4-wire standard schematic ______________________________________________________________________ 41
9. 4. Uni-Telway schematic_________________________________________________________________________________ 42
9. 5. 2-wire Jbus schematic ________________________________________________________________________________ 43
9. 6. Creating a Modbus bus using non-standard equipment_______________________________________________________ 44
9. 7. RS485 schematic for the card __________________________________________________________________________ 46
9. 8. Card connector pinout ________________________________________________________________________________ 46
While every precaution has been taken in the preparation of this document, Schneider
Electric SA assumes no liability for any omissions or errors it may contain, nor for any
damages resulting from the application or use of the information herein.
The products and options described in this document may be changed or modified at
any time, either from a technical point of view or in the way they are operated. Their
description can in no way be considered contractual.