The IEC standard does not define key words to configure information like the value range or the engineering unit for a Ctrl Variable. The configuration in a programming system is vendor specific but this specification defines the export format in the PLCopen XML Additional Datain the XML element addData.

The InstrumentRange Propertydefined in OPC 10000-8shall be provided in the XML element UaInstrumentRangeas part of the XML element representing the Ctrl Variable. The attributes of the XML element are formally defined in Table 35.

Table 35– Range XML attributes

Name

Type

Use

Default

Low

double

required

High

double

required

The EURange Propertydefined in OPC 10000-8shall be provided in the XML element UaEURangeas part of the XML element representing the Ctrl Variable. The attributes of the XML element are formally defined in Table 35.

The EngineeringUnits Propertydefined in OPC 10000-8shall be provided in the XML element UaEngineeringUnitsas part of the XML element representing the Ctrl Variable.