The HasEngineeringUnitDetails is a concrete ReferenceType and can be used directly. It is a subtype of NonHierarchicalReferences.

The semantics of this ReferenceType is to link a Variable with EUInformation DataType to its more detailed AddressSpace representation Instance of the ServerUnitType ObjectType.

The SourceNode of References of this type shall be a Variable with EUInformation DataType.

The TargetNode of this ReferenceType shall be an Instance of the ServerUnitType ObjectType.

The Reference has to change if the value (the concrete EngineeringUnit) is changing. Clients can subscribe to the value and then need to rebrowse.

The HasEngineeringUnitDetails is formally defined in Table 44.

Table 44 – HasEngineeringUnitDetails definition

Attributes	Value
BrowseName	HasEngineeringUnitDetails
InverseName	EngineeringUnitDetailsOf
Symmetric	False
IsAbstract	False
References	NodeClass	BrowseName	Comment
Subtype of NonHierarchicalReferences defined in OPC 10000-5.
Conformance Units
Data Access Quantities Base