Mode Change - Siemens SINUMERIK 840D Function Manual

18.2.2

Mode change

Switching between spindle and axis operation can be done as follows:
● Control mode → Oscillation mode
The spindle changes to oscillation mode if a new gear stage has been specified using
automatic gear step selection (M40) in conjunction with a new S value or by M41 to M45.
The spindle only changes to oscillation mode if the new gear step is not equal to the current
actual gear step.
● Oscillation mode → Control mode
When the new gear is engaged, the interface signal:
DB31, ... DBX84.6 (Oscillation mode)
is reset and the interface signal:
DB31, ... DBX16.3 (Gear changed)
is used to go to control mode.
The last programmed spindle speed (S value) is reactivated.
● Control mode → Positioning mode
To stop the spindle from rotation (M3 or M4) with orientation or to reorient it from standstill
(M5), SPOS, M19 or SPOSA are used to switch to positioning mode.
● Positioning mode → Control mode
M3, M4 or M5 are used to change to control mode if the orientation of the spindle is to be
terminated. The last programmed spindle speed (S value) is reactivated.
● Positioning mode → Oscillation mode
If the orientation of the spindle is to be terminated, M41 to M45 can be used to change to
oscillation mode. When the gear change is complete, the last programmed spindle speed (S
value) and M5 (control mode) are reactivated.
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA
S1: Spindles
18.2 Operating modes
735