Hi,

I have a similar question. I am using S7-400H redundant system. I need to establish the following communication to my equipments:

Purifier:  Modbus - TCP

Dryer: RS 485 communication port

Chiller: RS 485 communication port

So how can i manage communication redundancy with CP341 or CP441-2?

Please help me with hardware and software selection

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Split from establish Modbus RTU (RS232/RS485) communication in S7-400/400H system using Cp441-2 module.

Hello

Im not a S7400h Specialist but perhaps this FAQ could help:

https://support.industry.siemens.com/cs/de/en/view/78028908

https://support.industry.siemens.com/cs/de/en/view/38066687

Bye Murof