414-5h redundant PLCs - Can install them with sm 321 module or it's better to use sm 431?

Jen_Moderator

New question published by hakimsadaf is split to a separate thread with the subject Getting error when creating Simatic PC station.

Best regards
Jen_Moderator

 I want to buy 414-5h redundant PLCs , can we install them with sm 321 module or it's better to use sm 431

Sure sm 321,322,331,332 are cheaper than sm 421,422,431,432 

Thanks 

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Split from about SIEMENS PLC.

husseinwaledia

I want to buy 414-5h redundant PLCs , can we install them with sm 321 module or it's better to use sm 431

Sure sm 321,322,331,332 are cheaper than sm 421,422,431,432 

Thanks 

Please don't post twice or more for the same problem.

You also post here (5th reply):

https://support.industry.siemens.com/tf/de/en/posts/s7-412-5h-extension/161439/?page=0&pageSize=10#post820041 

Closed cause question posted twice.

The second thread with the subject Can S7-300 analog and digital input/output modules be installed on a CPU 414 -5h? is published within the conference SIMATIC S7-400 / S7-400H / S7-400F /FH.

Best regards
Jen_Moderator