Siemens SINUMERIK 840D sl Programming Manual page 65

If the SETINT instruction includes an interrupt routine as well as LIFTFAST , the liftfast is
executed before the interrupt routine.
Example:
N10 SETINT(2) PRIO=1 LIFTFAST
or
N30 SETINT(2) PRIO=1 LIFT_Z LIFTFAST
In both cases, the liftfast is executed when input 2 with top priority is enabled.
• With N10, execution is stopped with alarm 16010 (as no asynchronized subroutine, ASUB,
• The ASUB "LIFT-Z" is executed with N30.
When determining the lift direction, a check is performed to see whether a frame with mirror
is active. If one is active, right and left are inverted for the lift direction with regard to the
tangent direction. The direction components in tool direction are not mirrored. This behavior
is activated via MD $MC_LIFTFAST_WITH_MIRROR=TRUE
Sequence of motions with lift fast
The distance through which the geometry axes are retracted from the contour on liftfast can
be defined in machine data.
Interrupt routine without LIFTFAST
Decelerates on the path and starts the interrupt routine as soon as motion on the path stops.
This position is stored as the interrupt position and is approached with REPOS with RMI at the
end of the interrupt routine.
Interrupt routine with LIFTFAST
Decelerates on the path and simultaneously performs the FIFTFAST motion as an overlaid
motion. If the path motion and LIFTFAST motion stop, the interrupt routine starts.
The position on the contour is stored as the interrupt position at which the LIFTFAST motion
was started, thus leaving the path.
The interrupt routine behaves with LIFTFAST and ALF=0 identical as the interrupt
routine without LIFTFAST.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
was specified).
1.14 Interrupt routine (SETINT, DISABLE, ENABLE, CLRINT)
Flexible NC programming
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