OPC UA Structure DataTypes – OPC UA for Computerized Numerical Control (CNC) Systems – for CNC Systems: OPC UA Information Model

7.3 OPC UA Structure DataTypes

7.3.1 General

This section is for describing all structure data types.

7.3.2 CncPositionDataType

This DataType combines position values that are of common interest. CncPositionDataType comprises the current position value, the setpoint position value and the remaining distance to go for a positioning unit. The position values can be of any type (rotation, linear or similar). CncPositionDataType is defined in Table 30.

Table 30 – CncPositionDataType Structure

Name	Type	Description
CncPositionDataType	Structure	Structure of position elements.
ActPos	Double	Position current value.
CmdPos	Double	Position setpoint value.
RemDist	Double	Remaining distance.

Its representation in the AddressSpace is defined in Table 31.

Table 31 – CncPositionDataType Definition

Attributes	Value
BrowseName	CncPositionDataType

CncPositionVariableType is based on the CncPositionDataType. It offers information for unit and range additionally to the different position values of CncPositionDataType. The unit and range information is valid for all three position values. CncPositionVariableType is formally defined in Table 32.

Table 32 – CncPositionVariableType Definition

Attribute	Value
BrowseName	CncPositionVariableType
IsAbstract	False
ValueRank	-1
DataType	CncPositionDataType

References	NodeClass	BrowseName	DataType	TypeDefinition	ModellingRule
Subtype of the BaseDataVariableType

HasComponent	Variable	ActPos	Double	BaseDataVariableType	Mandatory
HasComponent	Variable	CmdPos	Double	BaseDataVariableType	Mandatory
HasProperty	Variable	0:EngineeringUnits	EUInformation	PropertyType	Mandatory
HasProperty	Variable	0:EURange	Range	PropertyType	Mandatory
HasComponent	Variable	RemDist	Double	BaseDataVariableType	Mandatory