Siemens Sinumerik 840D sl Programming Manual page 267

The constant coefficient (a
programmed end point is independent of G90 / G91.
X(p) and Y(p) are calculated as follows from the programmed values:
As a result of the programmed start points, end points, coefficient a
intermediate results are as follows:
If polynomial interpolation is active and a denominator polynomial is programmed with zeros
within the interval [0,PL], this is rejected and an alarm is output. Denominator polynomials
have no effect on the motion of special axes.
Note
Tool radius compensation can be activated with G41, G42 in conjunction with polynomial
interpolation and can be applied in the same way as in linear or circular interpolation modes.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
) of the denominator polynomial is always assumed to be 1. The
0
2
X(p) = (10 - 10 * p ) / (1 + p
2
Y(p) = 20 * p / (1 + p )
with 0 ≤ p ≤ 1
Numerator
10 + 0 * p - 10 * p
(X) =
Numerator
0 + 20 * p + 0 * p
(Y) =
Denominator = 1 + p
2
4.5 Polynomial interpolation (POLY, POLYPATH, PO, PL)
2
)
2
2
Special Motion Commands
and PL=1, the
2
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