This is my first post on PLCS. I've looked around the site, but I have not seen this exact problem. I have a PV 550 that has been operating in this machine with a Slick 500 for many years. All of the sudden I got a ERROR 60 (in several languages as seen several places on this site), but now I have lost all communication with the PV 550. My fault light is blinking (application error), but I have been unable to reload the application with the 1747-PIC, through the RS-232 on the controller, or with the compact flash in the PC card adapter even though I have never had trouble doing so in the past. Any thoughts?