Siemens SINUMERIK 840D sl Function Manual page 1255

● Writing of NC/PLC IS:
DB31, ... DBX16.0-16.2 (actual gear stage A to C)
by the PLC.
● Once the PLC has sent:
DB31, ... DBX16.3 (gear changed)
to the NCK, the last movement to be active is continued, if available.
For indirect encoders (motor encoders), the homing status is cleared:
DB31, ... DBX60.4/5 = 0.
Block change
If the spindle is switched to oscillation mode
with NC/PLC IS:
DB31, ... DBX82.3 (change gear),
the processing of the part program remains suspended.
A new block is not executed.
If oscillation mode is terminated with NC/PLC IS:
DB31, ... DBX16.3 (gear changed),
the processing of the part program is resumed.
A new block is executed.
Figure 16-5
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Block change following oscillation mode
S1: Spindles
16.4 Configurable gear adaptation
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