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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  B.1.3 Server maintains previous states
  Example of a Condition that maintains previous states via branches EventId BranchId Active Acked Confirmed Retain Description a) NULL False True True False Initial state of Condition . 1 NULL True ... Event . b) If the current state of the Condition is acknowledged then the Acked flag is set and the new state is reported ( Event #2). If the Condition state changes