Siemens Sinumerik 840D sl Programming Manual page 247

4.2 Spline interpolation (ASPLINE, BSPLINE, CSPLINE, BAUTO, BNAT, BTAN, EAUTO, ENAT, ETAN, PW, SD,
Syntax
General:
ASPLINE X... Y... Z... A... B... C...
BSPLINE X... Y... Z... A... B... C...
CSPLINE X... Y... Z... A... B... C...
For a B spline, the following can be additionally programmed:
PW=<n>
SD=2
PL=<value>
For A and C splines, the following can be additionally programmed:
BAUTO / BNAT / BTAN
EAUTO / ENAT / ETAN
Significance
Spline interpolation type:
ASPLINE
BSPLINE
CSPLINE
Points along a curve and check points:
X... Y... Z...
A... B... C...
Point weight (only B spline):
PW
<n>
Spline degree (only B spline):
SD
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Command to activate A spline interpolation
Command to activate B spline interpolation
Command to activate C spline interpolation
The ASPLINE, BSPLINE and CSPLINE commands are modally
effective and belong to the group of motion commands.
Positions in Cartesian coordinates
Using the PW command, a so-called "point weight" can be
programmed for every point along the curve.
"Point weight"
Range of values: 0 ≤ n ≤ 3
Increment: 0.0001
Effect: n > 1
n < 1
A third degree polygon is used as standard, However, a second
degree polygon can also be used by programming SD=2.
Special Motion Commands
The checkpoint attracts the curve
more significantly.
The checkpoint attracts the curve
less significantly.
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