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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.2 AlarmConditionType
  state. The optional Property MaxTimeShelved is used to set the maximum time that an Alarm Condition may be shelved. The value is expressed as duration. Systems can use this Property ... present, it will also be enforced for the OneShotShelved state, in that an Alarm Condition will transition to the Unshelved state from the OneShotShelved state if the duration specified