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• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  4.3 Acknowledgeable Conditions
  types of the base ConditionType . AcknowledgeableConditions expose states related to acknowledged or confirmed in a Condition . An AckedState and a ConfirmedState extend the EnabledState defined by the Condition . The state ... which adds a confirmation to the basic Acknowledge is illustrated in Figure 4 . The Confirmed Acknowledge model is typically used to differentiate between acknowledging the presence of a Condition
• OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions
  5.7.2 AcknowledgeableConditionType
  current conditions. If the system can not determine if the condition is Acknowledged or Confirmed , they shall be set to false (not Acknowledged and not Confirmed