AnnotationDataType DataType definition – OPC Unified Architecture

6.6.1 AnnotationDataType DataType definition

This structure contains additions as explanation and specification of the physical quantity such as "relative" for a relative velocity. The structure is defined in Table 51.

Table 51 – AnnotationDataType Structure

Name	Type	Description
AnnotationDataType	structure	Subtype of Structure defined in OPC 10000-5
Annotation	String	Names the annotation to give further information about value like how it is measured or where it originates from.
Discipline	String	Gives a human readable classification of the physical quantity according to its field of application to allow grouping of values. These can be, for example, “Engineering”, “Finance” or similar.
Uri	String	Names a source for deeper description of the annotation.

Examples are given in Table 52.

Table 52 – AnnotationDataType examples

Name	Values for a linear acceleration	Values for AC voltage	Values for DC voltage	Values for AC RMS voltage
AnnotationDataType
Annotation	linear	AC	DC	RMS
Discipline	-	Electrical Engineering	Electrical Engineering	Electrical Engineering
Uri	-	https://www.britannica.com/science/alternating-current	https://www.britannica.com/science/direct-current	https://en.wikipedia.org/wiki/Root_mean_square

Its representation in the AddressSpace is defined in Table 53.

Table 53 – AnnotationDataType definition

Attribute		Value
BrowseName		AnnotationDataType
IsAbstract		False

References	NodeClass		BrowseName	DataType	TypeDefinition	Other
Subtype of the Structure defined in OPC 10000-5

Conformance Units
Data Access Quantities Base