Unfortunately transferring the PLC motherboard doesn't help the case of being able to view the program/future proof the application without doing a full redesign and rebuild.
How is it possible the PLC has retained it's program if the battery hasn't been changed since 2008 and we have had multiple annual shutdowns where the PLC would have lost power? Which is why I don't see how the program hasn't been burned during the initial download.
There was a 7 digit password noted on some of the drawings found with the PLC, is there somewhere I can put this into Visilogic to see if it's stopping me from uploading?