Can someone tell me how to go about finding out which diagnostic parameter is for certain applications. I have a GE Fanuc O-T control that uses the B gcode system. I have the GE Fanuc Operators manual and the GE Fanuc Maintenance manual. Both books show parameters however they are the system parameters. Where is the list of what the diagnostic parameters do? I also have the MTB manuals. One of them is the electrical diagrams. Im not too sure how to read them. As most of you know a little knowledge can be devastating to a CNC control!