Siemens SINUMERIK 840D sl Programming Manual page 402

Supplementary commands
14.6 Travel to fixed stop (FXS, FXST, FXSW)
FXSW:
<axis>:
Note
The commands FXS, FXST and FXSW are modal.
The programming of FXST and FXSW is optional: If no parameter is specified, the last
programmed value or the value set in the relevant machine data applies.
Activate travel to fixed stop: FXS[<axis>] = 1
The movement to the destination point can be described as a path or positioning axis
movement. With positioning axes, the function can be performed across block boundaries.
Travel to fixed stop can be performed simultaneously for several axes and parallel to the
movement of other axes. The fixed stop must be located between the start and end positions.
Example:
Program code
X250 Y100 F100 FXS[X1]=1 FXST[X1]=12.3 FXSW[X1]=2
...
CAUTION
It is not permissible to program a new position for an axis if the "Travel to fixed stop" function
has already been activated for an axis/spindle.
Spindles must be switched to position-controlled mode before the function is selected.
402
Optional command for setting the window width for the fixed stop
monitoring
Specified in mm, inches or degrees
Machine axis name
Machine axes (X1, Y1, Z1, etc.) are programmed
Comment
; Axis X1 travels with
feed F100 (parameter
optional) to
destination position
X=250 mm.
The clamping torque is
12.3% of the maximum
drive torque,
monitoring is
performed in a 2 mm
wide window.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals