Siemens SINUMERIK 840D sl Function Manual page 373

NOTICE
Frames with rotation
Frames with rotation do not influence the retraction position of machine axes.
For the same axis names of a channel and machine axis, retraction motion is executed in the
workpiece coordinate system.
Enable for retraction without geometrical interrelationship POLFMASK
The program command POLFMASK allows axes to be selected, which, when rapid lift is
activated, traverse independently to their position defined with POLF. A variable parameter list
can be used to select any number of axes for rapid lift; however, all axes must be located in
the same coordinate system.
Enable for retraction with linear relationship POLFMLIN
The language command POLFMLIN allows axes to be selected that when rapid lift is
activated, should travel to their position defined with POLFin a linear relationship. A variable
parameter list can be used to select any number of axes for rapid lift; however, all axes must
be located in the same coordinate system, (i.e. only geo axes). Between initiating retraction
and the linear relationship being reached, a path is traveled, which, although deviating from
the programmed path, does not quite reach the linear relation. If the constellation is
unsuitable, this transition may last as far as the end points programmed with POLF. The
control optimizes to the shortest possible transition.
General
The following sections are equally valid for POLFMASK and POLFMLIN.
The parameters valid at triggering time are decisive for the retraction movement. If one of
these parameters (G code, POLF, POLFMASK, POLFMLIN, Frame, etc.) changes during
retraction (block change), this change does not affect the retracting movement that has
already been started.
Before rapid lift to a fixed position can be enabled via POLFMASKorPOLFMLINa position must
have been programmed with POLF for the selected axes. There is no machine data for pre-
assigning the values of POLF.
During interpretation of POLFMASK or POLFMLIN, alarm 16016 is issued if POLF has not
been programmed.
If retraction is activated, the position for retraction can still be changed. However, it is no
longer possible to change the coordinate system and an attempt is rejected with an alarm
16015.
If POLF is programmed again after enabling retraction, the position at which this axis was first
programmed must be specified in the coordinate system, in which this axis was first
programmed.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
R3: Extended stop and retract
6.2 Control-managed ESR
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