OPC UA defines 8 Node Class types in the address space Object, Variable, Method, ObjectType, VariableType, ReferenceType, DataType, View. The COM UA Proxy maps only the nodes of Node Class types Object, Variable to the OPC DA types as shown in the figure below. Only the nodes under the Objects node are considered for the COM UA Proxy address space and others such as Types, Views are not mapped.

Figure A.15 shows an example mapping of OPC DA to OPC UA information.


Figure A.15 – Sample OPC DA mapping of OPC UA Information Model and Address Space