Endless rotation
In the case of endless rotation (M03/M04), the speed and the direction of rotation are commanded. The spindle is accelerated constantly or in accordance with a characteristic. Endless rotation is terminated by spindle stop (M05), reference point travel (G74) or a setup block (M19).
DIN66025 programming
M3/M4 S..
Extended syntax
S[M3/M4 REV..]