-

OPC UA PubSub Configuration Error (PLCN0042): '...':

In the OPC UA PubSub communication configuration, a global variable or IN Port is connected more than once to a subscribed variable (which is part of a data set read from a particular writer).
Such a write access is only allowed once within the project.

Example:

Remedy

  1. Double-click the error message to jump to the corresponding editor.
  2. Map the subscribed variable to a global variable or IN port which is not yet assigned.