68202723_S7-1500_ModbusRTU_DOC_v21_en.pdf (1,7 MB)

68202723_S7-1500_ModbusRTU_PROJ_v2d0d1_U.zip Project for TIA Portal V15.1 (2,1 MB)

Current version 2.1 for STEP 7 Professional V15.1 (TIA Portal)

Master-Slave Communication via Modbus RTU S7-1500 CM PtP RS422/485 HF, ET 200SP CM PtP
Entry ID: 68202723,    V2.1,    12/2019

This application shows you how you can realize the function of a Modbus RTU master as well as that of a Modbus RTU slave in a S7-1500/ET 200SP automation system. 

The application demonstrates how to:

• configure the CM PtP RS422/485 HF as Modbus RTU master

• configure the ET 200SP CM PtP as Modbus RTU slave

• implement a Modbus RTU master and slave program in the program of a S7-1500 CPU

The example is designed such that the RTU master program as well as the RTU slave programs are realized together in one S7-1500 CPU. Here, the Modbus RTU master communication module is the S7-1500 CM PtP RS422/485 HF and the Modbus RTU slaves have been realized with the CM PtP communication modules of the ET 200SP. These Modbus RTU slaves in turn have been connected to the S7-1500 CPU via the ET 200SP head module. The two program parts (Modbus master and Modbus slaves) can be easily separated by you and can be adjusted to your own applications.