Why CNC cutting machine controller display show ARCON?

Q: I have a SteelTailor old CNC machine with blue screen controller. When I try to cut the plasma is not starting. The controller display show  ARCON. But when I go to DIAGONOSE and set M12 to 1 the plasma starts. 

A: This problem might be caused by controller parameter setting problem.Go to PARA[F4]----PLAS[F4] ------ARC ON M ORDER should be set as 12
                                 ------ARC OFF M ORDER should be set as 13

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