Dear Experts,

           I have a problem in the Analog input redundancy. I am using AI Module 6ES7 331-7NF10-0AB0. I have deactivated the channels 0,1,4,5,6 and 7. Now only ch2 and ch3 is activated and the redundancy is enabled for the same.

           I am using the channel group specific redundancy CGP V52 version Redundant IO libraries. I have done the program and my both AI module could read the values properly in the VAT table. I am feeding the current to both channels in both the modules and I could read the status in FB453 DB (that no channel is passivated). When I remove ch3 from 1st AI module, the Status is properly updating. But the 2nd module data is not written on the 1st module address.

           The screenshot of the FB453 DB (When Ch2 connected, Ch3 removed in 1st module and Ch2 connected, Ch3 Connected in 2nd module). My FC451 RET_VALUE is always 1. No errors in RED_IN block is found.

           Tolerence is 20% and Discrepancy time is 3000 ms.

           Kindly help me out to sort out this problem.

Thank you, But didnt work. 

I could be able to send any datas if required. Thank you,

Closed, cause question posted twice.

The second thread with the subject S7 400H System Analog Input Redundancy Problem is published within the conference SIMATIC S7-400 / S7-400H / S7-400F /FH.

The answers are moved to this thread.

Best regards

Blue Moderator