This ReferenceTypecan be used to expose the relation between an object controlling other objects and the controlled objects. For example, it can be used to relate a PLC to the field devices or machine-modules controlled by the PLC or a software component to the hardware components controlled by the software component.

The Controls is a concrete ReferenceTypeand can be used directly. It is a subtype of HierarchicalReferences.

The semantic of this ReferenceTypeis to relate the controlling component to the components controlled by the controlling component.

The SourceNodeof Referencesof this ReferenceTypeshall be an Objector ObjectTyperepresenting the controlling component, as for example a PLC or a software component.

The TargetNodeof Referencesof this ReferenceTypeshall be an Objectrepresenting a component that is controlled by the TargetNode.

Controls is formally defined in Table 3.

Table 3– Controls Definition

Attributes

Value

BrowseName

Controls

InverseName

IsControlledBy

Symmetric

FALSE

IsAbstract

FALSE

References

NodeClass

BrowseName

Comment

Subtype of HierarchicalReferences defined in OPC 10000-5

Conformance Units

Base Info Controls