OPC UA write to BaseDataType is not supported

I have a simulink model that exchanges data through OPC UA blocks, my model was working correctly but I closed it and reopened it and now when I run it I get the following error:

MATLAB System block 'RealTime_BSM1_WSAN_1/OPC UA Write1/opcInternalBlock' error occurred when invoking 'outputImpl' method of 'opcUAWrite'. The error was thrown from '

'C:\Program Files\MATLAB\R2024a\toolbox\icomm\opc\opcblks\opcuablks\opcUAWrite.p' at line 0'.

Writing to BaseDataType type nodes is not supported.

Español: Tengo un modelo simulink que intercambia datos a través de bloques OPC UA, mi modeloe staba funcionando correctamente pero lo he cerrado y vuelto a abrir y ahora al ejecutarlo me aparece el error que se menciona anteriormente

Answer 1

[Govind KM]

Hi Andrea,

I encountered a similar issue when trying to write to a node using OPC UA blocks in Simulink. The node in question was a Variable node with a Server Data Type of BaseDataType. As per OPC UA specifications, the BaseDataType is Abstract, which does not have an encoding and is hence not supported by the Industrial Communication Toolbox. A solution that worked for me was to update the server to set the node data type as one of the supported OPC UA server data types mentioned here:

https://www.mathworks.com/help/icomm/ug/opc-ua-server-data-types.html?

Details on BaseDataType are mentioned in documentation from the OPC Foundation:

https://reference.opcfoundation.org/Core/Part3/v105/docs/8.7

Hope this helps!

Answer 2

[Mguirhi]

I'm facing the same issue. I am working on a Simulink model and exchanging data with my PLC through OPC read and write blocks. When I start the simulation, everything works fine, but after 3 to 5 minutes, I get this error:

"C:\Program Files\MATLAB\R2024a\toolbox\icomm\opc\opcblks\opcuablks\opcUAWrite.p at line 0."

I adapted each variable data type going to and coming from the PLC as the documentation suggests (REAL → SINGLE, etc.), but the issue persists.

For the record, I deleted the OPC UA Write block and tested with just the OPC UA Read block, and I encountered the same error, but now it mentions opcUARead instead of opcUAWrite.

Can anyone help with this? Thanks in advance!