In order to follow along with this tutorial, you will need: To configure S7 PLCs as Modbus TCP on TIA Portal, take a look at our previous tutorial on Modbus TCP communication in Siemens TIA Portal. In this tutorial, we will learn how to configure Modbus RTU in Siemens TIA Portal as both master and slave. RTU can be transmitted in well over 1000 meters as compared to TCP which is 100 meters without using repeaters. Modbus RTU offers some advantages over TCP, one such advantage is in the area of long-distance communication. In industrial communication, Modbus RTU (Remote terminal unit) is one of the most universal and accepted protocols used owing to the fact that numerous automation systems have Modbus-RTU interfaces for communication.
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