MMS Connect supervision Error 421, Communication Watchdog failure
In our plant we have the ABB 800XA DCS system.
I received an alarm:"MMS Connect supervision Error 421, Communication Watchdog failure" (see attatched file). After this alarm was received i cannot see or operate certain motors and valves of the plant.
I checked for failure alarms on the PLCs (PM861A)and communication modules (CI867, CI853, CI854 etc), ethernet cables etc. I could not find any problem there.
I also checked with the Plant Engineering Workstation (Service structure) to see if some service stopped but all services were up and running ok.
I would be gratefoul if anyone could give some help to solve this problem.
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