Calling OPC UA server methods using the AsOpcUac library

[pavel.vavra]

There is a sample for the AsOpcUac library as the OPC UA project in the Getting Started section of Automation Studio. It includes a method call section (see help). Some parts could be a bit tricky:

• Parameterizing FUB UA_MethodGetHandle
  • ObjectNodeID and MethodNodeID Identifier and IdentifierType must be specified
    • find a method in UaExpert and see these information in the Attribute window
  • MethodNodeID
    
    
  • ObjectNodeID
    • method parent node (“Control” node is a parent of SetBrightness method)
      
      
• Parameterizing of InputArguments of FUB UA_MethodCall
  • one argument Brightness in our case of data type UInt32 (check UaExpert)
    
    
  • the information is set in AS
    
    

ArSim (OPC UA client) and T50 (OPC UA server enabled in service pages) were used in the test.

[corne.geerts]

I would always use the TranslatePath function to get the nodeid. Another firmware of T50 could change all the numeric nodeid identifiers.