Siemens SINUMERIK 840D sl Function Manual page 1260

S1: Spindles
16.4 Configurable gear adaptation
GSC at fixed position
Typical time sequence for the gear stage change at fixed position:
t :
1
t :
2
t :
3
1260
With the programming of S1300, NCK detects a new gear stage (second gear stage), NCK sets
NST DB31, ... DBX84.5 (positioning mode) and blocks processing for the next part program block
(= internal feed disable*).
The spindle is stationary, and exact stop is signaled.
Gear stage change - wait time
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions