Settable Path Reference (Spath, Upath) - Siemens SINUMERIK 840D sl Programming Manual

Work preparation
3.7 Special motion commands
As a result of the programmed start points, end points, coefficient a
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.
3.7.6

Settable path reference (SPATH, UPATH)

For polynomial interpolation (POLY, ASPLINE, BSPLINE, CSPLINE, COMP...), the positions
of the path axes i are specified as polynomials p
1 within an NC block.
FGROUP selects the axes (FGROUP axes) to which the path feedrate F applies. An interpolation
with constant speed on the path S of the FGROUP axes means during the polynomial
interpolation normally a non-constant change of curve parameter U. Consequently, two
610
Numerator (X) = 10 + 0 * p - 10 * p
Numerator 0 + 20 * p + 0 * p
(Y) =
Denominator = 1 + p
2
Y
10
2
2
X
(U). The curve parameter U moves from 0 to
i
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
and PL=1, the intermediate
2
NC programming