The ProgramTransitionEventType is a subtype of the TransitionEventType. It is used with Programs to acquire intermediate or final results or other data associated with a state transition. A Program can have a unique ProgramTransitionEventType definition for any transition. Each ProgramTransitionEventType specifies the IntermediateResult data specific to the designated state transition on that ProgramStateMachineType. Each transition can yield different intermediate result data. Table 9 specifies the ProgramTransitionEventType.

Table 9 identifies the ProgramTransitionEventTypes that are specified for ProgramStateMachineTypes.

Table 9 – ProgramTransitionEventType

Attribute

Value

BrowseName

ProgramTransitionEventType

IsAbstract

True

References

NodeClass

BrowseName

DataType

TypeDefinition

ModellingRule

Subtype of the base TransitionEventType defined in OPC 10000-16.

HasComponent

Variable

IntermediateResult

BaseDataType

BaseDataVariableType

Mandatory

Conformance Units

Program Basic

TransitionNumber identifies the Program transition that triggered the Event.

FromStateNumber identifies the state before the Program transition.

ToStateNumber identifies the state after the Program transition.

The IntermediateResult is an Object that aggregates a set of Variables whose values are relevant for the Program at the instant of the associated transition. The ObjectType for the IntermediateResult specifies the collection of Variables using a set of HasComponent References.