8 Reference Types

8.6 HasExternalVar

This ReferenceType is a subtype of the Organizes ReferenceType defined in OPC 10000-5. Its representation in the AddressSpace is specified in Table 24.

Table 24 – HasExternalVar ReferenceType

Attributes	Value
BrowseName	HasExternalVar
InverseName	ExternalVarOf
Symmetric	False
IsAbstract	False
References	NodeClass	BrowseName	Comment
Subtype of Organizes ReferenceType defined in OPC 10000-5

The HasExternalVar ReferenceType is a concrete ReferenceType and can be used directly.

The semantic of this ReferenceType is to reference components of a Ctrl Program Organization Unit declared with the key word VAR_EXTERNAL.

The SourceNode of References of this type shall be a subtype of CtrlProgramOrganizationUnitType or an instance of one of its subtypes.

The TargetNode of this ReferenceType shall be a Variable or an Object of the ObjectType CtrlFunctionBlockType or one of its subtypes.