Siemens SINUMERIK 840D sl Function Manual page 1702

Detailed Description
2.6 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 2-12
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.
92
Exact stop zones of a spindle
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0