Siemens SINUMERIK 840D Function Manual page 752

S1: Spindles
18.2 Operating modes
Figure 18-2 Positioning with stationary spindle
Phase 1
Case 1: Spindle not synchronized
With the programming of SPOS, M19 or SPOSA the spindle accelerates with the acceleration
from the machine data:
MD35200 $MA_GEAR_STEP_SPEEDCTRL_ACCEL (Acceleration in the speed control
mode)
This direction of rotation is defined by the machine data:
752
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA