3.3.2.12 Plane -> Lcmp Axis

If this item is checked, users can use G17/G18/G19 (plane selection commands) to designate the tool length compensation axis. The tool length compensation axis is perpendicular to the selected plane, that is to say:

G17 designates the tool compensation axis to be Z-axis.
G18 designates the tool compensation axis to be Y-axis.
G19 designates the tool compensation axis to be X-axis.