HI Redundant Controllers Go in Fault
In our plant, we're using SIL3 safety system via PM865 Redundant Controllers.
From time to time both of these controllers go in fault state.
According to CPULog files(also you can find attached files for CPULogs), there are some discrepancies for analog input value, which is belongs to AI880 card.
I've checked my software once again, I've used SdInReal(SIL3) Control Module for this IO. But I am stil confused. How can SM and PM have different status for this signal?
Thanks for your advice.