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 |