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Scope: Core (OPC-10000-*) All specs

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OPC-10000-5 – OPC Unified Architecture - Part 5: Information Model

6.4.2 BaseEventType

Address Space Events EventId is generated by the Server to uniquely identify a particular Event Notification . The Server is responsible to ensure that each Event has its unique EventId ... StatusCode for the EventId indicating an error. EventType describes the specific type of Event . The EventType shall always be returned as value and the Server is not allowed to return
OPC-10000-9 – OPC Unified Architecture - Part 9: Alarms & Conditions

5.14.2 Communication problems

with the underlying system is: If communication fails to the underlying system, For any Event field related information that is exposed in the address space, the Value/ StatusCode obtained when ... reading the Event fields that are associated with the communication failure shall have a value of NULL and a StatusCode of Bad_CommunicationError. For Subscription s that contain Conditions