Siemens Sinumerik 840D sl Programming Manual page 263

a2, a3, a4, a5 :
PL :
Activating/deactivating polynomial interpolation
The polynomial interpolation is activated in the part program using the POLX G command.
The POLY G command together with G0, G1, G2, G3, ASPLINE, BSPLINE and CSPLINE
belong to the 1st group.
Axes, which are only programmed with name and end point (e.g. X10), are linearly moved. If
all axes of an NC block are programmed in this way, the control behaves the same as for G1.
The polynomial interpolation is implicitly deactivated again by programming another
command of the 1st G group G0, G1).
Polynomial coefficient
The PO value (PO[]=) or ...=PO(...) specifies all polynomial coefficients for an axis.
Several values are specified, separated by commas corresponding the degree of the
polynomial. Different degrees of polynomials are possible for various axes within one block.
POLYPATH subprogram
Using POLYPATH(...), the polynomial interpolation can be selectively released for certain
axis groups:
The axes that are not released are linearly moved.
Polynomial interpolation is enabled as standard for both axis groups.
Polynomial interpolation is deactivated for all axes by programming without the
POLYPATH( ) parameter.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Only path axes and supplementary axes:
Only orientation axes:
(when moving with orientation transformation)
4.5 Polynomial interpolation (POLY, POLYPATH, PO, PL)
The coefficients a
with their value; value range as for path
dimension. The last coefficient in each case
can be omitted if it equals zero.
Length of the parameter interval where
polynomials are defined (definition range of
the function f(p)).
The interval always starts at 0, p can assume
values from 0 to PL.
Theoretical value range for PL:
0,0001 ... 99 999,9999
Note:
The PL value applies to the block in which it
is located. If no PL is programmed, then
PL=1 is applied.
Special Motion Commands
, a , a , and a are written
2 3 4 5
POLYPATH("AXES")
POLYPATH("VECT")
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