IGS-NT Communication Guide
6
8.7.1 GE Digital Energy - P485 Modbus to Profibus Converter 123
8.7.2 Converter settings 123
8.7.3 Setup example (using wizard) 124
8.7.4 Controller settings 127
8.8 Anybus Comunicator 128
8.8.1 Ethernet converter from twisted pair(UTP/STP) to optic 128
8.8.2 Recommended equipment 128
9 Modbus Connection 129
9.1 Modbus Step by Step 129
9.2 Important setpointsin the controller 129
9.2.1 Modbus communication via RS232 – single controller 130
9.2.2 Modbus communication viaRS485 130
9.2.3 Modbus communication via RS485 – multiple controllers 131
9.2.4 Modbus communicationviaI-LB+ 131
9.2.5 Modbus communicationvia IB-NT 132
9.3 Modbus Protocol Description 132
9.3.1 Modbus TCP 132
9.3.2 Modbus RTU 135
9.3.3 Alarm list reading 139
9.3.4 History reading 143
9.4 Check field calculation 143
9.5 How get numbers of Modbus communication objects 143
9.6 User Modbus 144
10 Modbus Appendix 146
10.1 Modbus Switches 146
10.2 Data types 146
10.3 Communication status 148
10.4 Error list 150
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