## 7.23 CartesianCoordinatesType

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 81.

Table 81 – CartesianCoordinatesType Definition

Attribute Value
BrowseName CartesianCoordinatesType
IsAbstract True
ValueRank Scalar
DataType CartesianCoordinates

Subtype of the BaseDataVariableType defined in 7.4

References NodeClass BrowseName DataType TypeDefinition Modelling Rule
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.