Siemens SINUMERIK 840D Function Manual page 754

S1: Spindles
18.2 Operating modes
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL.
At the point, which is determined by the braking start point calculation in Phase 1, the spindle
decelerates to a standstill with the acceleration given in the following machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
Phase 3
At the point, which is determined by the braking start point calculation in Phase 2, the spindle
decelerates to a standstill with the acceleration given in the following machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
Phase 3a:
When the SPOS command is activated the proximity of the end point is such that the spindle can
no longer be accelerated up to machine data:
MD35300 $MA_SPIND_POSCTRL_VELO.
The spindle is braked to a standstill with the acceleration given in the following machine data:
MD35210 $MA_GEAR_STEP_POSCTRL_ACCEL
Phase 4, 4a
The spindle is stationary and it has reached the position. The position control is active and stops
the spindle in the programmed position.
NC/PLC IS:
DB31, ... DBX60.6 (Position reached with exact stop coarse)
and
DB31, ... DBX60.7 (Position reached with exact stop fine)
are set if the distance between the spindle actual position and the programmed position
(spindle setpoint position) is less than the settings for the exact stop fine and coarse limits.
This is defined in the machine data:
MD36010 $MA_STOP_LIMIT_FINE
MD36000 $MA_STOP_LIMIT_COARSE
Phase 3:
At the point, which is determined by the braking start point calculation in Phase 2, the spindle
decelerates to a standstill with the acceleration given in the following machine data:
MD35210 $MA_GEAR_STEP_ POSCTRL_ACCEL
Phase 4:
The spindle is stationary and it has reached the position. The position control is active and stops
the spindle in the programmed position.
NC/PLC IS:
DB31, ... DBX60.6 (Position reached with exact stop coarse)
and
DB31, ... DBX60.7 (Position reached with exact stop fine)
754
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA