Yesterday we had a CP Peer-to-Peer issue that caused some valves to trip
closed, which in turn tripped our plant.
On closer investigation we found a number of BAD (cyan) connections, some of
these had also changed state from FALSE (healthy) to TRUE (trip), even though
the source block was healthy. The sink end of the connection is an FCP280, the
source end of the bad connections came from two FCP270's.
The event was triggered by adding new blocks to the FCP280 that were totally
unrelated to the trip logic. Exiting the ICC runs a checkpoint, and that
created the bad peer to peer connections.
The only way to resolve the bad connections was to checkpoint the source CP
then checkpoint the sink CP.
The images were updated to the latest available at the time, after last June's
advisory regarding Loss of Peer to Peer Connections with CP270 or CP280.
We realised that this also happened here last October on the same CP, but the
resolution was different, i.e. delete one bad connection, checkpoint sink CP,
all bad connections cleared, then rebuild connection, checkpoint , all ok.
A case has been raised with Schneider UK, they are looking in to this now.
Has anyone else had similar problems with FCP280?
Regards
Terry
Terry Lloyd, Systems Engineer
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Barry
Vale of Glamorgan, CF63 2YL
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