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S7 1200 Communication with CM1241

12/26/2024 9:18 AM	Rate (0)
M.S varu Joined: 10/7/2023 Last visit: 5/26/2025 Posts: 13 Rating: (0)	Please guide me how can I communicate with CM1241 on digital display with Modbus communication. with S71200 . Thanks .
	Last edited by: M.S varu at: 12/26/2024 09:20:25
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12/26/2024 12:04 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/16/2025 Posts: 12409 Rating: (2717)	Hello MS varu; Here is a very complete FAQ presenting the basics of using a CM 1241 for Modbus RTU communications. It covers the selection of the appropriate model of CM 1241 (there are 3 on the market), to configuration and programming recommendations. https://support.industry.siemens.com/cs/ca/en/view/47756141 Hope this helps, Daniel Chartier

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This contribution was helpful to 1 thankful Users danw

12/28/2024 11:14 AM	Rate (0)
M.S varu Joined: 10/7/2023 Last visit: 5/26/2025 Posts: 13 Rating: (0)	Thanks a Lot .

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12/30/2024 5:28 AM	Rate (0)
Duris_I Diamond Expert Joined: 4/28/2015 Last visit: 4/19/2025 Posts: 10876 Rating: (838)	Hello, M.S varu Thanks a Lot . you need for first to check your display documentation about mapping of all expected data addresses. This is specific case with Modbus protocol and it is impossible to to without that display Modbus mapping documentation. Is it correct that your display use Modbus protocol? What is role of this display in this case, Master or Slave? This is very important to know because generally displays are Masters in this case so you need set correct role of your PLC here.
	Last edited by: Duris_I at: 12/30/2024 05:41:56 With best regards... Ivan Duris Flight: OMICO
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This contribution was helpful to 1 thankful Users dchartier