Without a backup of the PLC program you are dead in the water. The program is stored on a ram module which is battery backed until unplugged then you have so many seconds to get it plugged into a unit. I doubt replacing the power supply will do anything. Serge used a lot of these units. The TI software program and special cable is required to reload the PLC. Maybe the manufacture of the controller has files. That will be your only hope. Almost all Union Companies would back this up to prevent disaster.
