Motion Sequence For Interrupt Routines - Siemens Sinumerik 840D sl Programming Manual

Code numbers with traversing directions for LFWP
For LFWP, the direction in the working/machining plane has the following assignment:
• G17: X/Y plane
ALF=1: Retraction in the X direction
ALF=3: Retraction in the Y direction
• G18: Z/X plane
ALF=1: Retraction in the Z direction
ALF=3: Retraction in the X direction
• G19: Y/Z plane
ALF=1: Retraction in the Y direction
ALF=3: Retraction in the Z direction
1.14.8

Motion sequence for interrupt routines

Interrupt routine without LIFTFAST
Axis motion is braked along the path down to standstill (zero speed). The interrupt routine
then starts.
The standstill position is saved as interrupt position and is approached at the end of the
interrupt routine for REPOS with RMI.
Interrupt routine with LIFTFAST
Axis motion is braked along the path. The LIFTFAST motion is simultaneously executed as
superimposed motion. If the path motion and LIFTFAST motion have come to a standstill
(zero speed), the interrupt routine is started.
The position on the contour is saved as interrupt position where the LIFTFAST motion is
started and therefore the path was left.
The interrupt routine with LIFTFAST and ALF=0 behaves in precisely the same way as the
interrupt routine without LIFTFAST.
Note
The absolute value through which the geometry axes move when quickly retracting from the
contour can be set using machine data.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Flexible NC programming
1.14 Interrupt routine (ASUB)
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