应该不是OP问题,估计你以前的840D设成了复位后坐标系回到默认的G500,而你对刀都没有用G500,所以总是没问题.(20150[7]=1,20152[7]=0)

MD 20152[7] is effective only if MD 20110, Bit 0 = 1.
0: The initial setting of the G group is set according to the entry inMD 20150[7]: GCODE_RESET_VALUES
1: The current G group setting is retained on reset/end of part program.
MD 20150[7]=1,开机坐标系为G500,2为G54,3为G55....