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Table of contents
Important information 2
Table of contents 3
About this manual 7
Further reading 8
1 Introduction 9
2 Before you begin - safety information 11
2.1 Qualification of personnel 11
2.2 Intended use 11
2.3 Hazard categories 12
2.4 Basic information 13
2.5 Standards and terminology 14
3 Basics 15
3.1 Modbus TCP technology 15
3.1.1 Function principle 15
3.1.2 Bus topology 15
3.1.3 Client / server model 16
3.1.4 Network service SNMP 16
3.2 Modbus TCP protocol 17
3.2.1 MBAP header 18
3.3 Modbus TCP communication 19
3.3.1 Connection management 19
3.3.2 Modbus response to a Modbus request 20
3.3.3 Reading and writing parameters 21
3.3.4 I/O scanning to "Drive Profile Lexium" 22
3.3.4.1 I/O scanning Output 23
3.3.4.2 I/O scanning Input 24
3.3.4.3 Parameter channel 26
3.4 Modbus services - "Function Code" 28
3.4.1 "Function Code" 3 (Read Multiple Registers) 28
3.4.2 "Function Code" 8 (Diagnostics) 29
3.4.3 "Function Code" 16 (Write Multiple Registers) 30
3.4.4 "Function Code" 23 (ReadWrite Multiple Registers) 31
3.4.5 "Function Code" 43 (Encapsulated Interface Transport) 32
3.4.6 Examples 33
3.4.6.1 Example of "Function Code" 3 33
3.4.6.2 Example of "Function Code" 16 33
4 Installation 35
LXM32M Table of contents
Modbus-TCP module 3
0198441113843, V1.01, 01.2012