Siemens SINUMERIK 828D Function Manual page 1350

S1: Spindles
16.8 Spindle monitoring
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 16-10 Exact stop zones of a spindle
DB31, ... DBX60.7 and DB31, ... DBX60.6 (position reached with exact stop coarse / fine)
The two limit values defined by machine data:
MD36000 $MA_STOP_LIMIT_COARSE (Exact stop limit coarse)
and
MD36010 $MA_STOP_LIMIT_FINE (Exact stop limit fine)
are output to the PLC using NC/PLC IS:
DB31, ... DBX60.7 (Position reached with exact stop coarse)
and
DB31, ... DBX60.6 (Position reached with exact stop fine).
Block change for SPOS and M19
When positioning the spindle with SPOS or M19 the block is changed
dependent on end point monitoring with NC/PLC IS:
DB31, ... DBX60.6 (Position reached with exact stop fine).
All other functions programmed in the block must have achieved their end criterion (e.g., all auxiliary functions
acknowledged by the PLC).
With SPOSA, the block change does not depend on the monitoring of the end point.
Basic Functions
1350
Function Manual, 09/2011, 6FC5397-0BP40-2BA0