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Modbus RTU slave communication on S7 300/400 series via ET200SP CM-PtP module

6/27/2025 2:52 PM	Rate (0)
Binuxx Advanced Member Joined: 10/8/2012 Last visit: 8/6/2025 Posts: 8 Rating: (0)	Could someone suggest me an application example for Step7 Classic (V5.6) or PCS7 up to V9.0 which can be used on our controller side as a Modbus RTU slave (partner side is the RTU master)? Please note that I am NOT asking about the solution for TIA Portal or S7 1500! So, ONLY FOR A CLASSIC STEP7 solution I am looking for! Any idea? Thanks in advance, Colleagues! BR Janos

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6/29/2025 7:37 PM	Rate (0)
danw Gold Expert Joined: 3/28/2010 Last visit: 9/5/2025 Posts: 1171 Rating: (220)	Maybe this document, *Master-Slave Communication with Modbus RTU for S7-300 and ET 200S Systems*, will help you https://support.industry.siemens.com/cs/document/109474714/master-slave-communication-with-modbus-rtu-for-s7-300-and-et-200s-systems?dti=0&lc=en-WW

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