Dear All,

Please can anyone give a sample application for LMRTU  Redmaster for different holding registers and read and write jobs?

maria.noronha.costa

Hi!

I need to have multiple devices with the RS485 interface communicating with an S7-1200 CPU 1215C PLC (using a communication module CM1241). Hardware-wise, it is possible to have those devices sharing the same bus, and both the device and the communication module have RS485 interfaces. However, I realize that some of the devices (for example, this distance sensor https://docs-apac.rs-online.com/webdocs/1534/0900766b8153436e.pdf) don't support Modbus RTU protocol (they use another protocol, specified in the datasheet).

I would like to know if it is possible to configure the communication module and/or the PLC to accept other communication protocols.

Thank you in advance!

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Split from RS-485 2-wire communication from S7-1200 PLC (CM 1241).

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Split from Multiple devices with the RS485 interface communicating with an S7-1200 CPU 1215C PLC.

Dear Mr. Daniel,

Thank you for your reply. I'm using s7-1200 plc with two CM 1241 with ring redundant communication via Modbus RTU. I am reading 4 jobs and writing 1 job with 10 devices. But the complete cycle takes time 50 seconds. we have the  Library for Modbus RTU (LMRTU) but it is not available for an application example. if you need I will send the sample program.

https://support.industry.siemens.com/cs/se/en/view/109747565