Siemens SINUMERIK 840D sl Programming Manual page 405

Supplementary conditions
• Measurement with deletion of distance-to-go
"Measure with deletion of distance-to-go" (MEAS command) and "Travel to fixed stop"
cannot be programmed at the same time in one block.
Exception:
One function acts on a path axis and the other on a positioning axis or both act on
positioning axes.
• Contour monitoring
Contour monitoring is not performed while "Travel to fixed stop" is active.
• Positioning axes
For "Travel to fixed stop" with positioning axes, the block change is performed irrespective
of the fixed stop movement.
• Link and container axes
Travel to fixed stop is also permitted for link and container axes.
The status of the assigned machine axis is maintained beyond the container rotation. This
also applies for modal torque limiting with FOCON.
References:
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• Travel to fixed stop is not possible:
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• If the torque limit is reduced too far, the axis will not be able to follow the specified setpoint;
the position controller then goes to the limit and the contour deviation increases. In this
operating state, an increase in the torque limit may result in sudden, jerky movements. To
ensure that the axis can follow the setpoint, check the contour deviation to make sure it is
not greater than the deviation with an unlimited torque.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Function Manual, Extended Functions; Several Control Panels on Multiple NCUs,
Distributed Systems (B3)
Programming Manual, Job Planning; Subject: "Travel to fixed stop (FXS and FOCON/
FOCOF)"
With gantry axes
For concurrent positioning axes that are controlled exclusively from the PLC (FXS must
be selected from the NC program).
Supplementary commands
14.6 Travel to fixed stop (FXS, FXST, FXSW)
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