G20/G21: Unit Selection

These codes are used to change the unit of measurement.

If the system encounters one of these codes and detects that the current unit needs to be changed, a "restart the system" alarm will be generated. After restarting the system, the relevant parameters and offset values will be automatically adjusted to the new unit by the system. However, user variables will not be adjusted.

For this reason, ensure that subprograms such as tool measurement or tool changing, which utilize user variables, are programmed by the machine manufacturer to function properly in both measurement units..

G20: Inch system selection

G21: Millimeter system selection