Annex D (informative) Mapping from OPC A&E to OPC UA A&C ToC Previous Next

D.3 Alarms and Events COM UA proxy ToC Previous Next

D.3.6 Event Condition mapping ToC Previous Next

Events of any subtype of ConditionType are designated COM Condition Events and are subject to additional processing due to the stateful nature of Condition Events. COM Condition Events transition between states composed of the triplet ENABLED ACTIVE ACKNOWLEDGED. In UA A&C, Event subtypes of ConditionType only carry a value which can be mapped to ENABLED (DISABLED) and optionally, depending on further sub typing, may carry additional information which can be mapped to ACTIVE (INACTIVE) or ACKNOWLEDGED (UNACKNOWLEGED). Condition Event processing proceeds as described in Table D.5 (see A&E ONEVENTSTRUCT “Attribute” rows: OPC_CONDITION_ACTIVE, OPC_CONDITION_ENABLED and OPC_CONDITION_ACKED).

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