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External fault

3/21/2019 4:37 AM	Rate (0)
Engr72 Posts: 2 Rating: (0)	Hi We have s7 400 sil 3 redundant system for our waste heat recovery system Recently we have been facing a problem regarding external faults. In both plcs, internal /external fault is keep coming regardless of any actual physical external fault. Hmi is not showing any cause as well. And when we reset, faults are removed but after a certain time like days as well faults come back again. Any help will be appreciated here Thank you
Engr72 Posts: 2 Rating: (0)
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3/21/2019 7:49 AM	Rate (0)
mopS04 Posts: 5521 Rating: (1058)	hi Engr72, please tell us which CPUs you have exactly? name the MLFB, starting with 6ES741x-xxxxx-xxxx also tell us which FW-version the CPUs have. regards,
mopS04 Posts: 5521 Rating: (1058)
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3/21/2019 1:46 PM	Rate (0)
Engr72 Posts: 2 Rating: (0)	6ES7 952-1AK00-0AA0 VERSION V4. 5.6 Regards.
Engr72 Posts: 2 Rating: (0)
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3/21/2019 2:41 PM	Rate (0)
mopS04 Posts: 5521 Rating: (1058)	6ES7 952-1AK00-0AA0 this is not the CPU. try again...
mopS04 Posts: 5521 Rating: (1058)
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