Siemens SINUMERIK 840D sl Programming Manual page 263

Example 3: Application of the second gear-stage data record
The switching thresholds of the second gear-stage data record for the maximum and
minimum speed are evaluated for G331/G332 and when programming an S value for the
active master spindle. Automatic M40 gear-stage change must be active. The gear stage as
determined in the manner described above is compared with the active gear stage. If they are
found to be different, a gear-stage change is performed.
Program code
N05 M40 S500
...
N50 G331 S800
N55 SPOS=0
N60 G331 Z-10 K5
Example 4: No speed programming → monitoring of the gear stage
If no speed is programmed when using the second gear-stage data record with G331, then
the last speed programmed will be used to produce the thread. The gear stage does not
change. However, monitoring is performed in this case to check that the last speed
programmed is within the preset speed range (defined by the maximum and minimum speed
thresholds) for the active gear stage. If it is not, alarm 16748 is signaled.
Program code
N05 M40 S800
...
N55 SPOS=0
N60 G331 Z-10 K5
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
9.12 Tapping without compensating chuck (G331, G332)
Comment
; Gear stage 1 is selected.
; Master spindle with second gear-stage data record: Gear
stage 2 is selected.
; Align spindle.
; Tapping, spindle acceleration from second gear-stage data
record.
Comment
; Gear stage 1 is selected, the first gear-stage data record
is active.
; Monitoring of spindle speed 800 rpm with gear-stage data
record 2: Gear stage 2 should be active, alarm 16748 is
signaled.
Motion commands
263