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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  9.2 AlarmMetricsType
  HasComponent Variable AlarmCount UInt32 BaseDataVariableType Mandatory HasComponent Variable StartTime UtcTime BaseDataVariableType Mandatory HasComponent Variable MaximumActiveState Duration BaseDataVariableType Mandatory HasComponent Variable MaximumUnAck Duration BaseDataVariableType Mandatory HasComponent Variable CurrentAlarmRate Double AlarmRateVariableType Mandatory ... Server started or the time of the last Reset Method invocation, whichever is later. MaximumActiveState is the maximum time for which an Alarm was in the active state. MaximumUnAck