Siemens SINUMERIK 840D sl Function Manual page 1637

Phase 4, 4a
The spindle is stationary and has reached the end point. Position control is active and holds
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 machine data:
MD36010 $MA_STOP_LIMIT_FINE
and
MD36000 $MA_STOP_LIMIT_COARSE.
Phase 3:
At the point, which is determined by the braking start point in Phase 2,
the spindle decelerates to standstill with the acceleration from the following machine data:
MD35210 $MA_GEAR_STEP_ POSCTRL_ACCEL
Phase 4:
The spindle is stationary and has reached the end point. Position control is active and holds
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 machine data:
MD36010 $MA_STOP_LIMIT_FINE
and
MD36000 $MA_STOP_LIMIT_COARSE.
Aborting the positioning process
The positioning action can only be aborted with NC/PLC IS:
DB31, ... DBX2.2 (Delete distancetogo/Spindle reset).
The positioning action is aborted with each reset (Operator panel front reset / NC/PLC IS
DB31, ... DBX2.2 (Delete distancetogo/Spindle reset)),
independent of machine data:
MD35040 $MA_SPIND_ACTIVE_AFTER_RESET (individual spindle reset).
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed Description
2.1 Spindle modes
27