Siemens SINUMERIK 840D Function Manual page 798

S1: Spindles
18.4 Configurable gear adaptations
Example of the signal flow
t :
1
t :
2
798
As a result of the newly programmed S value S1300 in the NC program, the NC identifies the
necessity to switch over the gear stage (1st → 2nd gear stage), and requests the enable from the
PLC:
● NC → PLC: DB31, ... DBX82.3 = 1 (switchover gear stage)
The NC locks program processing (internal feed rate disable *)
The NC signals spindle speed == 0 to the PLC:
● DB31, ... DBX61.4 = 1 (spindle stationary)
The PLC user program enables the oscillation mode.
● PLC → NC: DB31, ... DBX18.5 = 1 (oscillation enable)
Note
The oscillation enable must be set at the latest at time t
The NC starts to oscillate.
.
2
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA