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• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  6.9 MonitoredItem Service Set
  MonitoredItem Service Set The MonitoredItem Service Set is used by the Client to create and maintain MonitoredItems . MonitoredItems monitor Variables , Attributes and EventNotifiers . They generate Notifications when they detect certain ... change in value; and EventNotifiers for newly generated Alarm and Event reports. Each MonitoredItem identifies the item to monitor and the Subscription to use to periodically publish Notifications