OPC Tag Write Permission Denied to Siemens OPC UA Server

Ignition
1

Hello All,

I am using Ignition V8.1.19 and configured OPC client connection with Siemens Sinumerik One PLC OPC-UA server. This is basically the S7-1500 PLC.

I have transaction groups to update the data in SQL Database .
I am able to read OPC tags and storing them in Database based on trigger value.
But while writing back the results i am getting error .
( Error writing to TransactionOk.value: Bad_AccessDenied("User does not have permission to perform the requested operation.") )

Write_Fail_Error
Write_Fail_Error1920×1080 283 KB

What permission its asking about and for which user.

We use OpcUaClient as a user name while creating OPC-Client connection.

2

Seems to obviously be a Siemens configuration issue. Are you sure your user has write privileges in the Siemens? Or is writing to nodes that aren't always read-only?

3

The Sunumerik systems default to read only and require an OPC Admin account to set the user permissions. This is done with an OPC method call. The OPC-UA user has permission to grant their own permission set to write over all areas. Check the Siemens manuals on the OPC-UA server.