Siemens SINUMERIK 828D Programming Manual page 419

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.
Deactivate travel to fixed stop: FXS[<axis>] = 0
Deselection of the function triggers a preprocessing stop.
The block with
Example:
Program code
X200 Y400 G01 G94 F2000 FXS[X1]=0
...
CAUTION
The traversing movement to the retraction position must move away from the fixed stop,
otherwise damage to the stop or to the machine may result.
The block change takes place when the retraction position has been reached. If no
retraction position is specified, the block change takes place immediately the torque limit
has been deactivated.
Clamping torque (FXST) and monitoring window (FXSW)
Any programmed torque limiting
also approached at a reduced torque.
part program at any time. The changes take effect before traversing movements in the same
block.
Programming of a new fixed stop monitoring window causes a change not only in the
window width, but also in the reference point for the center of the window if the axis has
moved prior to reprogramming. The actual position of the machine axis when the window is
changed is the new window center point.
CAUTION
The window must be selected such that only a breakaway from the fixed stop causes the
fixed stop monitoring to respond.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
may and should contain traversing movements.
FXS[<axis>]=0
FXST
14.6 Travel to fixed stop (FXS, FXST, FXSW)
Comment
; Axis X1 is retracted from the fixed
stop to position X = 200 mm. All other
parameters are optional.
is effective from the block start, i.e. the fixed stop is
and can be programmed and changed in the
FXST FXSW
Supplementary commands
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