A property in the DA server is represented in the COM UA Wrapper as a Variablewith TypeDefinitionas PropertyType.

The properties for an item are retrieved using the QueryAvailableProperties call in the DA server.

Below are mappings of the property details to the OPC UA Property:

Table A.1shows the mapping between the common OPC COM DA properties to the OPC UA Node attributes/properties.

Table A.1– OPC COM DA to OPC UA Properties mapping

Property Name (PropertyID) of OPC COM DA

OPC UA Information Model

OPC UA DataType

Access Rights (5)

AccessLevel Attribute

Int32

EU Units (100)

EngineeringUnits Property

String

Item Description (101)

Description Attribute

String

High EU (102)

EURange Property

Double

Low EU (103)

EURange Property

Double

High Instrument Range (104)

InstrumentRange Property

Double

Low Instrument Range (105)

InstrumentRange Property

Double

Close Label (106)

TrueState Property

String

Open Label (107)

FalseState Property

String

Other Properties (include Vendor specific Properties)

PropertyType

Based on the DataType of the Property