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7.5 OPC UA VariableType ToC Previous Next

7.5.2 CapacityRangeType ToC Previous Next index

The CapacityRangeType is a subtype of the DataItemType. It is used to represent a scale of calibration values. The value of the Variable defines the range (lowest and highest value), and the resolution the size of each step. The VariableType is formally defined in Table 55.

Table 56 – CapacityRangeType Definition

Attribute Value
BrowseName CapacityRangeType
IsAbstract False
ValueRank −1 (−1 = Scalar)
DataType 0:Range
Description Represent a scale of calibration values. The value defines the range (lowest and highest value), and the resolution property the size of each step.

Subtype of the DataItemType defined in OPC 10000-8, i.e. inheriting the InstanceDeclarations of that Node

References NodeClass BrowseName DataType TypeDefinition Other
0:HasProperty Variable 0:EngineeringUnits 0:EUInformation 0:PropertyType M
0:HasProperty Variable Resolution 0:Double 0:PropertyType M

The CapacityRangeType inherits the Properties of the DataItemType. That does include the optional 0:ValuePrecision, defining the precision of the calibration value.

The mandatory 0:EngineeringUnits defines the engineering unit of the calibration values.

The Resolution defines the step size and is used in combination with the Range provided in the Value Attribute to determine, what individual calibration values can be used for calibration.

Remark: The quantity of the calibration value is of importance. This specification waits for this to be solved in the base OPC UA specification (OPC 10000-8), and will use this afterwards.

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