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Hi,
First of all, thanks in advance for those who support and advises.
I have a Modbus/TCP operational network. Last week a NOE 771 01 on one of my Hot Standby PLC System, Standby PLC stopped communicating. On its display the indication Fault, Kernel and Appl were illuminated. I replaced the card with a new one. It normalized but after a while it happened again on the same PLC. I tried with 3 new NOE cards but the fault remains. When I tested the card on a test system on my desk it seemed to be ok. The firmware and configuration is checked to be correct. What can cause this fault? Appreciate very much your advise. Thanks.
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