External app to retrieve all 800xA events
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Maybe you can use the ABBAERetrieval() function available in the DataDirect.xla part of Data Direct to read past alarms and events?
Otherwise, connecting to ABB.OPCEventServer.1 (the OPC AE Server of System 800xA) would give you all forthcoming events on a silver tray.
With an IM, the events can be stored in a message log in Oracle (SQL Access).