A Version 5 upgrade was done, and the PLC is no longer communicating.

Steps

1: Go through the Select Module Wizard, to make V5 select and setup the PLC interfaces again.

2: Close and Restart V5.

3. Make sure you have not enabled the Image or Image 32 Interface for testing, and this is set to the same interface number as the real plc interface. (some commands will appear to get through, but others will be gobbled and processed by the Image interface).

4. Display the interface, and use Commands, Next Station to see if the interface has loaded its setup file properly.