End Point Monitoring - Siemens SINUMERIK 840D Function Manual

S1: Spindles
18.8 Spindle monitoring
18.8.8

End point monitoring

End point monitoring
During positioning (the spindle is in positioning mode), the system monitors the distance from
the spindle (with reference to the actual position) to the programmed spindle position setpoint
(end point).
For this to work, in machine data:
MD36000 $MA_STOP_LIMIT_COARSE (Exact stop limit coarse)
and
MD36010 $MA_STOP_LIMIT_FINE (Exact stop limit fine)
two limit values can be defined as an incremental path starting from the spindle position
setpoint.
Regardless of the two limit values, the positioning of the spindle is always as accurate as
defined by the connected spindle measurement encoder, the backlash, the transmission ratio,
etc.
Exact stop window dependent on parameter set
Various parameter-set-dependent exact stop windows can be configured.
This makes it possible to work to different levels of accuracy in axis mode and spindle
positioning. The exact stop window can be configured separately for each gear step for spindle
positioning.
Figure 18-9
834
Exact stop zones of a spindle
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA