Siemens SINUMERIK 840D sl Programming Manual page 538

Path traversing behavior
8.2 Feedrate response (FNORM, FLIN, FCUB, FPO)
F=FPO(...,...,...)
The feed characteristic is programmed directly via a polynomial. The polynomial coefficients
are specified according to the same method used for polynomial interpolation.
Example:
F=FPO(endfeed, quadf, cubf)
endfeed, quadf and cubf are previously defined variables.
endfeed:
quadf:
cubf:
With an active FCUB, the spline is linked tangentially to the characteristic defined via FPO at
the block beginning and block end.
538
Feed at block end
Quadratic polynomial coefficient
Cubic polynomial coefficient
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
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