Siemens SINUMERIK 840D sl Function Manual page 1665

End of oscillation mode
On termination of oscillation mode, the spindle returns to openloop control mode and
automatically changes to the mode defined by SPCON or SPCOF.
All gearspecific limit values (min./max. speed, etc.) correspond to the set values of the actual
gear step.
Functionality
Machine tools of conventional design require a gear step change of the spindle in oscillation
mode.
If the machine data configuration is:
MD35010 $MA_GEAR_STEP_CHANGE_ENABLE = 1
the following sequence is implemented:
• Deceleration of the spindle.
• Output of VDI interface signals:
• The load gearbox can now "disengage".
• NC/PLC IS:
• Writing of NC/PLC IS:
• Once the PLC has sent:
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
The braking action corresponds to an M5 movement.
DB31, ... DBX84.6 (Oscillation mode)
DB31, ... DBX82.3 (Change gear)
DB31, ... DBX82.0-82.2 (Set gear step A to C).
If position control has been enabled, it is disabled:
DB31, ... DBX61.5 = 0.
DB31, ... DBX18.5 (Oscillation enable)
can be set by the PLC.
The spindle motor then performs an oscillation motion with preset values.
The oscillation motion is designed to facilitate and accelerate the reengaging of the gear
wheels.
DB31, ... DBX16.0-16.2 (Actual gear step A to C)
by the PLC.
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.
Detailed Description
2.3 Configurable gear adaptation
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