Siemens sinumerik 840D sl Function Manual page 357

Reactions to stop and axis enable signals
Stop characteristics for the retracting movement in response to "Axial feed stop" and "Feed
disable" signals are defined with the following channel-specific machine data:
MD21204 $MC_LIFTFAST_STOP_COND
Bit0: Axial VDI signal feed halt DB31 DBB4.3
=0 Stop of retraction motion with axial feed halt
=1 no stop of retraction motion with axial feed halt
Bit1: Feed block in channel DB21 DBB6.0
=0 stop of retraction motion with axial feed block in the channel
=1 stop of retraction motion with axial feed block in the channel
The "Axial feed stop" stop signal affects the entire retracting movement, i.e. all axis
movements defined with POLFMASK and POLFMLIN are stopped.
The retraction movement is restarted by canceling the signals.
The "NC stop" signal, DB21 DBB7.3, has no effect on the retraction movement.
Programming
The destination for the retraction axis is programmed with the language command:
POLF
POLF[ geo axis name | machine axis name ] (POsition LiftFast).
POLF is modal.
POLF can also be programmed incrementally. If this programming is carried out with a
geometry axis, the position is interpreted as a position in the workpiece co-ordinate system
WCS.
The frame valid at the time when lift fast was activated is considered. Important: Frames with
rotation also affect the direction of lift via POLF.
If POLF is programmed with a channel/machine axis, the position of the machine coordinate
system MCS must be specified. Frames with rotation do not affect the position for retraction.
If the identifiers for the geo axis and channel/machine axis are identical, retraction is carried
out in the workpiece coordinate system.
POLFMASK
The language command POLFMASK([ axis name1], [axis name2], ....) allows axes to be
selected, which will, on activation of fast lift, independently of each other traverse to their
defined position with POLF. A variable parameter list can be used to select any number of
axes for lift fast; however, all axes must be located in the same co-ordinate system (i.e. only
geo axes).
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
Detailed description
2.7 Extended stop and retract (ESR)
137