Siemens SINUMERIK 840D Function Manual page 797

The motor accelerates with the oscillation acceleration to the oscillation speed in the specified
setpoint direction of rotation:
● MD35410 $MA_SPIND_OSCILL_ACCEL (acceleration when oscillating)
● MD35400 $MA_SPIND_OSCILL_DES_VELO (oscillation speed)
Reversing the direction of rotation
The oscillation times and switching over the direction of rotation must be realized in the PLC
user program.
End of oscillation mode
On termination of oscillation mode, the spindle returns to the open-loop control mode and
automatically changes to the mode defined by SPCON or SPCOF.
All gear-specific limit values (min./max. speed, etc.) correspond to the parameterized values of
the actual gear stage.
Block change
Processing of the active NC program is stopped if the spindle was switched into the oscillation
mode (DB31, ... DBX82.3 = 1 (switchover gear stage)).
Processing of the NC program is continued if the gear stage has been switched over (DB31, ...
DBX16.3 == 1 (gear stage has been switched over).
Figure 18-5
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
Block change following oscillation mode
S1: Spindles
18.4 Configurable gear adaptations
797