Table of Contents
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1 Product Overview ....................................................................................................... 3
1.1 Product Functions ............................................................................................ 3
1.2 Main technical parameters ............................................................................... 3
2 Hardware Description ................................................................................................. 4
2.1 Product Appearance ......................................................................................... 4
2.2 Indicator Description ....................................................................................... 5
2.3 DIP Switch ....................................................................................................... 5
2.4 Profibus-DP Interface ...................................................................................... 6
2.5 Terminal definition ........................................................................................... 6
2.6 External terminal resistance ............................................................................. 7
2.7 Installation dimension ...................................................................................... 8
3 Product application topology ...................................................................................... 9
4 Testing application in Siemens Step 7 ...................................................................... 11
4.1 Modbus RTU Master Mode ........................................................................... 11
4.2 Modbus RTU Slave Mode ............................................................................. 27
5 Testing application in Siemens TIA V16 .................................................................. 34
5.1 Modbus RTU Master Mode ........................................................................... 34
5.2 Modbus RTU Slave Mode ............................................................................. 50
5.3 Modbus ASCII Master Mode ......................................................................... 56
5.4 Modbus ASCII Slave Mode ........................................................................... 58
6 Test application in Beckhoff TwinCAT 2 .................................................................. 60
7 Annex ........................................................................................................................ 69
7.1 Modbus-RTU Protocol Introduction .............................................................. 69
7.1.1 Modbus Storage Area .......................................................................... 69
7.1.2 Modbus Function Code ....................................................................... 69
7.2 Brief introduction of serial port network topology ........................................ 75
7.2.1 RS232 .................................................................................................. 75
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