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INDEX
Document: DPD00156A
Version release date: 4.5.09
1. Safety ............................................................................................................... 2
1.1 Danger ................................................................................................................................ 2
1.2 Warnings ............................................................................................................................ 3
1.3 Earthing and earth fault protection ................................................................................... 4
2. Modbus - general info....................................................................................... 6
3. Modbus technical data ...................................................................................... 8
3.1 Modbus RTU protocol......................................................................................................... 8
3.2 Modbus TCP protocol ......................................................................................................... 8
4. Modbus installation ........................................................................................ 10
4.1 Prepare for use through ethernet ................................................................................... 11
4.2 Prepare for use through RTU .......................................................................................... 13
5. Programming ................................................................................................. 16
5.1 Modbus RTU parameters and monitoring values (M5.7.3).............................................. 16
5.2 Modbus TCP parameters and monitoring values............................................................ 18
5.2.1 Ethernet common settings (M5.8.1) ................................................................................ 18
5.2.2 Modbus TCP settings (M5.8.2) ......................................................................................... 18
5.3 Modbus RTU parameter descriptions.............................................................................. 19
5.3.1 Modbus RTU Parameters................................................................................................. 19
5.3.2 Modbus RTU monitoring values....................................................................................... 19
5.4 Modbus TCP parameter descriptions .............................................................................. 21
5.4.1 Ethernet common settings .............................................................................................. 21
5.4.2 Modbus TCP settings ....................................................................................................... 22
5.4.3 Modbus TCP monitoring values ....................................................................................... 23
6. Communications............................................................................................. 26
6.1 Data addresses in Modbus messages ............................................................................. 26
6.2 Modbus memory map ...................................................................................................... 26
6.3 Modbus data mapping...................................................................................................... 27
6.3.1 Coil registers.................................................................................................................... 27
6.3.2 Input discrete registers.................................................................................................... 27
6.3.3 Holding and input registers ............................................................................................. 27
6.4 Example messages .......................................................................................................... 35
7. Fault tracing ................................................................................................... 38
7.1 Typical fault conditions .................................................................................................... 38
7.2 RS-485 bus biasing...........................................................................................................38
7.3 Other fault conditions.......................................................................................................39
8. Quick setup..................................................................................................... 42
9. Annex ............................................................................................................. 44
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