The EngineeringValue Variables are used to expose key results of an analyser and the associated values that qualified it. This type helps the Client quickly identify important values. For example, the concentration of a given chemical and the associated confidence factors like the F-Ratio from the PLS model. EngineeringValueType is formally defined in Table 84

Table 84 – EngineeringValueType Definition

Attribute		Value
BrowseName		EngineeringValueType
IsAbstract		True
References		NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the DataItemType defined in [OPC 10000-8]
HasComponent	Variable		<Identifier>		DataItemType	OptionalPlaceHolder

The Value Attribute of the EngineeringValue is the main value, for example, the concentration. Its HasComponent elements are there to qualify or describe this value. For example the associated confidence factors like F-Ratio from the PLS model.