This abstract VariableType is used as base to define multi-dimensional coordinates. Subtypes need to define the concrete number of dimensions. It reflects the semantic of its DataType, defined in 12.25. Subtypes shall expose the structure of their structured DataTypes as Variables. Additionally, it can define a unit for the coordinates (Property LengthUnit). The VariableType is formally defined in Table 89.

Table 89 – CartesianCoordinatesType Definition

Attribute		Value
BrowseName		CartesianCoordinatesType
IsAbstract		True
ValueRank		Scalar
DataType		CartesianCoordinates
References	NodeClass		BrowseName	DataType	TypeDefinition	Modelling Rule
Subtype of the BaseDataVariableType defined in 7.4
HasProperty	Variable		LengthUnit	EUInformation	PropertyType	Optional
Conformance Units
Base Info Spatial Data

LengthUnit defines the unit of each dimension of the cartesian coordinates. The DataType EUInformation is defined in OPC 10000-8. Note that the Property EngineeringUnits is intentionally not used, as it would have to define the engineering unit of the full cartesian coordinates, not its individual dimensions.