Siemens SINUMERIK 802D, Руководство по программированию и эксплуатации

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Programming
10.3 Axis movements
Cylindrical grinding
276
Programming and Operating Manual, 07/2009, 6FC5398-4CP10-2BA0
Deselecting the function
Deselection of the function triggers a preprocessing stop. The block with FXS[X1]=0 must
contain traversing movements.
Example:
N200 G1 G94 X200 Y400 F200
FXS[X1] = 0 Axis X1 is retracted from the fixed stop to
position
X= 200 mm.
CAUTION
The traversing movement to the retraction position must lead away from the fixed stop;
otherwise, damage to the fixed 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 once the torque limit has
been deactivated.
Further notes
● "Measuring with deletion of distance-to-go" ("MEAS" command) and "Travel to fixed stop"
cannot be programmed in the same block.
● Contour monitoring is not performed while "Travel to fixed stop" is active.
● 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. Ensure that the axis can still follow. For this reason, it must be verified that
the contour deviation is not larger than that with unlimited torque.
● A rate of rise ramp for the new torque limit can be defined in MD to prevent any abrupt
changes to the torque limit setting (e.g. when inserting a spindle sleeve).
System variable for status: $AA_FXS[
axis
]
This system variable provides the "Travel to fixed stop" status for the axis specified:
Value = 0: Axis not at fixed stop
1: Fixed stop has been approached successfully (axis is within fixed stop monitoring
window)
2: Approach to fixed stop has failed (axis is not at fixed stop)
3: Travel to fixed stop activated
4: Fixed stop detected
5: Travel to fixed stop is deselected. The deselection is not yet completed.
Query of the system variables in the parts program initiates a preprocessing stop.
For SINUMERIK 802D sl, only the static states can be detected before and after
selection/deselection.