OPC UA PubSub Configuration Error (PLCN0027): '...': Publisher ID must be unique.

In the configuration of the OPC UA PubSub communication, multiple connections with the same Publisher ID are defined. These IDs must be unique within a configuration.

Using the combination of Writer ID, Writer group ID and Publisher ID, a subscriber identifies the publisher from which to read data.

Remedy

Double-click the error message to jump to the affected editor position.
Define unique Ids for each affected connection.

Example