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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.8.17.1 Overview
  model is illustrated in Figure 17 . The state model supports two types of Shelving : OneShotShelving and TimedShelving . They are illustrated in Figure 16 . The illustration includes the allowed transitions between ... various sub-states. Shelving is an Operator initiated activity. In OneShotShelving , a user requests that an Alarm be Shelved for its current Active state or if not Active its next