Siemens SINUMERIK 840Di sl Programming Manual page 304

Feedrate Control and Spindle Motion
7.10 Spindle speed (S), direction of spindle rotation (M3, M4, M5)
N10 S300 M3
N20...N90
N100 SETMS(2)
N110 S400 G95 F...
N120...N150
N160 SETMS
Preset M commands, M3, M4, M5
In a block with axis commands, the above mentioned functions are activated before the axis
movements commence (basic settings on the control).
Example:
N10 G1 F500 X70 Y20 S270 M3
N100 G0 Z150 M5
Note
Machine data can be used to set when axis movements should be executed; either once the
spindle has powered up to the setpoint speed, or immediately after the programmed
switching operations have been traversed.
Working with multiple spindles
5 spindles – master spindle plus 4 additional spindles – can be available in one channel at
the same time.
304
;Speed and direction of rotation
;for drive spindle = preset master spindle
;Machining of right side of workpiece
;S2 is now master spindle
;Speed for new master spindle
;Machining of left side of workpiece
;Switch back to master spindle S1
;The spindle powers up to 270 rpm, then
;the movements are executed in X and Y.
;Spindle stop before retraction motion in Z
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals