Siemens SINUMERIK 840D sl Programming Manual page 270

Motion commands
9.14 Fast retraction for thread cutting (LFON, LFOF, DILF, ALF, LFTXT, LFWP, LFPOS, POLF, POLFMASK,
Example 3: Fast retraction to absolute retraction position
Path interpolation of X is suppressed in the event of a stop and a motion executed to position
POLF[X] at maximum velocity instead. The motion of the other axes continues to be
determined by the programmed contour or the thread lead and the spindle speed.
Program code
N10 G0 G90 X200 Z0 S200 M3
N20 G0 G90 X170
N22 POLF[X]=210 LFPOS
N23 POLFMASK(X)
N25 G33 X100 I10 LFON
N30 X135 Z-45 K10
N40 X155 Z-128 K10
N50 X145 Z-168 K10
N55 X210 I10
N60 G0 Z0 LFOF
N70 POLFMASK()
M30
270
Comment
; Activate (enable) fast retraction from axis X.
; Disable lift for all axes.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals