Siemens SINUMERIK 840D sl Programming Manual page 169
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Note
Parameters for B-SPLINE
The programmed restrictions (see A- or C-spline) do not have any affect on the B-spline. The
B spline is always tangential to the check polygon at its start and end points.
Point weight:
PW = n
Value range:
<= n <= 3
Effect:
n > 1
n < 1
Spline degree:
SD = 2
Distance between nodes:
PL = value
Value
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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
5.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN)
The weight details can be programmed as a so-called point-
weight (PW) for each interpolation point.
in increments of 0.0001
The check point exerts more "force" on the curve.
The check point exerts less "force" on the curve.
A third degree polygon is used as standard, but a second
degree polygon is also possible.
The distances between nodes are suitably calculated
internally. The control can also machine predefined node
distances that are specified in the so-called parameter-
interval-length (PL).
Value range as for path dimension
Special Motion Commands
5-5
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