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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.17.1 Overview
  Unshelve can be called to cause a transition to the Unshelve state; this includes Un-shelving an Alarm that is in the TimedShelve state before the time has expired ... UnshelveTime specifies the remaining time in milliseconds until the Alarm automatically transitions into the Un-shelved state. For the TimedShelved state this time is initialised with the ShelvingTime argument