3 INTRODUCTION 15
3.1 Supported configurations 17
3.2 Initialization time 18
4 FIRST COMMISSIONING 18
5 ASSEMBLY/DISASSEMBLY OF COMMUNICATION MODULE 19
5.1 Assembly 19
5.2 Disassembly 20
6 MODBUS/TCP INTERFACE 21
6.1 Communication modules 22
6.1.1 Installation instructions 23
6.2 Setup 23
6.2.1 TCP/IP configuration 23
6.2.2 TCP/IP address & Subnet settings 24
6.2.3 Modbus/TCP Timeout settings 24
6.3 Operating behavior in the case of a communication error 25
7 PROTOCOL 26
7.1 Telegram structure 26
7.2 Supported function codes 27
7.2.1 Function code 3, reading 16-bit or 32-bit parameters 28
7.2.2 Function code 6, write 16-bit parameter 29
7.2.3 Function code 16, write 16-bit parameter 31
7.2.4 Function code 16, write 32-bit parameter 32
7.2.5 Function code 100 (=0x64), read 32-bit parameter 33
7.2.6 Function code 101 (=0x65), write 32-bit parameter 34
7.2.7 Function code 8, diagnosis 36
7.2.8 Exception condition responses 38
7.2.9 Exception condition codes 39
7.2.10 Modbus/TCP mode of transmission 40
7.3 Resetting errors 40
8 PARAMETER ACCESS 41
8.1 Handling of datasets / cyclic writing of parameters 41
8.2 Handling of index parameters / cyclic writing 42
8.2.1 Example: Writing of index parameters 43
8.2.2 Example: Reading of index parameters 43
2
ACU
Modbus/TCP 10/13
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