Hi everyone,

I have been using the S7 OPC UA Client Function Block for communication between PLC and a robot with OPC UA Server. The server contains robot variables, and methods to trigger certain functions such as start program, stop program, load program, and get list of available programs. I could successfully read and write the variables using the function block. 

But what logic should be implemented for triggering multiple OPC UA Methods from the Client Function Block? I have the MethodHdls, MethodNodes with Identifier in the ClientConfiguration_DB for your reference. Neither all of the methods need Input Arguements nor the parameter "Input Arguements" in the Client_FB can be defined NULL. 

I could trigger only one function that requires arguement (loadProgram<program name>) from the PLC Client but cannot dynamically trigger other methods which doesn't need any arguements. 

Do you have any best practices or suggestion for logic in this regard? Please find attached the details of different methods in the ClientConfigurationDB, Client Interface and the OPC UA Client Function Block for your reference. 

Thanks in advance,

BR,
Arvind

Hej Arvind

Check chapter 11:

https://support.industry.siemens.com/cs/ww/en/view/59192925

Here there is also example and the use of OPC UA blocks:

https://support.industry.siemens.com/cs/ww/en/view/109762770