dResu

The fx3u plc suddenly gives an error. Unfortunately we dont have the back up program,so i upload using gx developer and diagnos the plc, it gives parameter error and link error 2. I notice that in the program there are yellow highlight in the ladder,it means what?Im totally new here in mitsubishi plc. We already request the backup program of the machine,in the meantime what can i do?Thank youRegards,D