Siemens Sinumerik 840D sl Programming Manual page 127

<NAME>:
LIFTFAST:
ALF=... :
Supplementary conditions
Behavior for active frame with mirroring
When determining the lift direction, a check is performed to see whether a frame with mirror is
active. In this case, for the retraction direction, right and left are interchanged referred to the
tangential direction. The direction components in tool direction are not mirrored. This behavior
is activated with using the MD setting:
MD21202 $MC_LIFTFAST_WITH_MIRROR = TRUE
Example
A broken tool should be automatically replaced by a daughter tool. Machining is then
continued with the new tool.
Main program:
Main program
N10 SETINT(1) PRIO=1 W_WECHS LIFTFAST
N20 G0 Z100 G17 T1 ALF=7 D1
N30 G0 X-5 Y-22 Z2 M3 S300
N40 Z-7
N50 G41 G1 X16 Y16 F200
N60 Y35
N70 X53 Y65
N90 X71.5 Y16
N100 X16
N110 G40 G0 Z100 M30
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Name of the subprogram (interrupt routine) that is to be executed.
Command: Fast retraction from contour
Command: Programmable traverse direction (in motion block)
Regarding the possibilities of programming with ALF refer to the subject
" Traversing direction for fast retraction from the contour [Page 128] ".
Flexible NC programming
1.14 Interrupt routine (ASUB)
Comments
; When input 1 is switched, the tool is
immediately retracted from the contour
with rapid lift (code No. 7 for tool
radius compensation G41). Then interrupt
routine "W_WECHS" is executed.
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