Siemens SINUMERIK 840D sl Function Manual page 1623

Spindle behavior at the end of gear step change
End of gear step change
• NC/PLC IS:
• Once the gear step change (GSW) has been acknowledged via the PLC (DB31, ...
2.1.3 Spindle oscillation mode
Operating principle
Oscillation mode is activated for the spindle during the gear step change.
A detailed functional description of "spindle mode oscillation mode" can be found under:
Literature:
/FB1/ functions manual Basic Functions; Spindles (S1), Sec.: "Gear stage change with
oscillation mode"
Basic logic functions: Spindles (S1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
DB31, ... DBX16.3 (Gear changed)
tells the NC that the new gear step
(NC/PLC IS DB31, ... DBX16.0-16.2 (Actual gear step A to C))
applies and oscillation mode is terminated.
In this case, it does not matter whether NC/PLC IS:
DB31, ... DBX18.5 (oscillation mode)
is still set.
The actual gear step should correspond to the set gear step.
The actual gear step signaled is relevant for selection of the parameter set.
DBX16.3), the spindle is in speed control mode (DB31, ... DBX84.7 = 1).
If a direction of rotation (M3, M4, M5 or FC18: "Start spindle rotation") or a spindle speed
(S value) was programmed before the gear step change, then the last speed and
direction of rotation will be reactivated after the gear step change.
Detailed Description
2.1 Spindle modes
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