The AuditUpdateStateEventType is a subtype of the AuditUpdateMethodEventType. It can be used to generate an Event identifying that a Transition of a StateMachine was triggered. It is formally defined in Table 16.

Table 16 – AuditUpdateStateEventType

Attribute		Value
BrowseName		AuditUpdateStateEventType
IsAbstract		True
References	NodeClass		BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the AuditUpdateMethodEventType defined in OPC 10000-5
HasProperty	Variable		OldStateId	BaseDataType	PropertyType	Mandatory
HasProperty	Variable		NewStateId	BaseDataType	PropertyType	Mandatory
Conformance Units
Auditing UpdateStates

The AuditUpdateStateEventType inherits the Properties of the AuditUpdateMethodEventType.

The inherited Property SourceNode shall be filled with the NodeId of the StateMachine instance where the State changed. If the State changed in a SubStateMachine, then the NodeId of the SubStateMachine has to be used.

The SourceName for Events of this type should be the effect that generated the event (e.g. the name of a Method). If the effect was generated by a Method call, the SourceName should be the name of the Method prefixed with "Method/".

OldStateId reflects the Id of the state prior the change.

NewStateId reflects the new Id of the state after the change.