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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions5.8.2 AlarmConditionTypelong as the Alarm remains in any of the SuppressedState, OutOfServiceState or Shelved state. The optional Property MaxTimeShelved is used to set the maximum time that an Alarm Condition ... shelved. The value is expressed as duration. Systems can use this Property to prevent permanent Shelving of an Alarm. If this Property is present, it will be an upper limit
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OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions5.8.17.1 OverviewOperator initiated activity. In OneShotShelving , a user requests that an Alarm be Shelved for its current Active state or if not Active its next Active state. This type of Shelving ... Shelving state will automatically clear. In TimedShelving , a user specifies that an Alarm be shelved for a fixed time period. This type of Shelving is quite often used to block