Polynomial Definition (Fctdef) - Siemens SINUMERIK 840D sl Programming Manual

Motion synchronous actions
10.4 Actions in synchronized actions
10.4.6

Polynomial definition (FCTDEF)

Function
FCTDEF can be used to define 3rd order polynomials in the form y=a
These polynomials are used by the online tool offset (FTOC) and the evaluation function
(SYNFCT).
Programming
FCTDEF(polynomial no.,LLIMIT,ULIMIT,a
Parameter
Polynomial_No.
LLIMIT
ULIMIT
a ,a
0
These values can also be accessed via system variables
$AC_FCTLL[n]
$AC_FCTUL[n]
$AC_FCT0[n]
$AC_FCT1[n]
$AC_FCT2[n]
$AC_FCT3[n]
Note
Writing system variables
• The system variables can be written from the parts program or from a synchronized
• The $AC_FCTLL[n], $AC_FCTUL[n], $AC_FCT0[n] to $AC_FCTn[n] system
When writing form synchronized actions, the polynomial coefficients and function value limits
are active immediately.
10-30
,a ,a
1 2 3
action. When writing from parts programs, program STOPRE to ensure that writing is
block synchronized.
variables can be changed from synchronized actions
0 ,a 1 ,a 2 ,a 3 )
Number of the 3rd order polynomial
Lower limit for function value
Upper limit for function value
Polynomial coefficient
Lower limit for function value
Upper limit for function value
a
0
a
1
a
2
a
3
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
+a x+a x +a x .
2 3
0 1 2 3
Job planning