Collision Monitoring ("Bottleneck Detection"); Function - Siemens SINUMERIK 840D sl Function Manual

W1: Tool offset
2.5 2D tool radius compensation
Multiple intersections
With inside corners it is also possible that predictive contour calculation finds multiple
intersections of the equidistant paths in several consecutive blocks. In this case, the last
intersection is always used as the valid intersection. The previous intersection points are not
approached:
Figure 2-21
For further information, see also Chapter "Collision monitoring ("bottleneck detection")
(Page 76)".
Special features
Where multiple intersections with the next block are found, the intersection nearest the start of
the next block applies.
2.5.8

Collision monitoring ("bottleneck detection")

2.5.8.1

Function

If tool radius compensation is active, collision monitoring ("bottleneck detection") checks by
predictive contour calculation whether the equidistant paths of non-consecutive blocks
intersect. This look-ahead function allows possible collisions to be detected in advance and
permits the control to actively avoid them.
The maximum number of blocks that are looked at in advance can be set by channel-specific
machine data (see "Parameterization (Page 77)").
If an intersection is detected, the motions programmed between these blocks on the
compensation plane are not executed. Alarm 10763 is displayed:
"The path component of the block in the compensation plane will become zero."
The NC program is not interrupted. The bottleneck is bypassed. All other motions and
executable instructions (M commands, traversal of positioning axes, etc.) contained in the
omitted blocks are executed at the position of the last intersection found in the sequence in
which they are programmed in the NC program.
76
In this example, the pocket is machined only as much as is possible without causing a
contour violation.
Function Manual, 06/2019, A5E47435126B AA
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