12 Mapping of DataTypes

12.2 Mapping to OPC DI Types

12.2.7 Variable

12.2.7.1 General

The parameter set of a device (offline and online) is described by means of the DataInfo data type (available with the <GetDataInfo> method from IInstanceData (offline) and IDeviceData (online)).

DataInfo provides a description of the available data without the values. The actual values are accessible with <Read> and <Write> methods from IInstanceData (offline) and IDeviceData (online).

DataInfo provides a list of data items (member DeviceDataItems), which may represent a range of types. Some of these data items are mapped to DataVariables (see Table 68).

OPC	FDT
DataVariable (according OPC UA 10000-3)	Data
	UnitData
	RangeData
	AlarmData
	SubstituteData
	StructDataGroup
FunctionalGroup(according OPC UA 10000-100)	DataGroup
Block object (according OPC UA 10000-100)	ModuleDataGroup