Siemens SINUMERIK 840Di sl Function Manual page 50

Detailed description
2.4 Actions in synchronized actions
Number of polynomials
The number of polynomials that can be defined simultaneously is specified by the following
machine data:
MD28252 $MC_MM_NUM_FCTDEF_ELEMENTS (number of FCTDEF elements)
Block-synchronous polynomial definition
FCTDEF(
The relationship between the output variable y and the input variable x is as follows:
y= a
The parameters specified in the function are stored in the following system variables:
$AC_FCTLL[n]:
$AC_FCTUL[n]:
$AC_FCT0[n]:
$AC_FCT1[n]:
$AC_FCT2[n]:
$AC_FCT3[n]:
On the basis of this relationship, it is also possible to write or modify polynomials directly via
the relevant system variables. The validity range of a polynomial is defined via limits
$AC_FCTLL[n] and $AC_FCTUL[n].
Call of polynomial evaluation
Stored polynomials can be used in conjunction with the following functions:
• Online tool offset, FTOC()
• Polynomial evaluation, SYNFCT().
References:
/PG/ Programming Manual Fundamentals
/PGA/Programming Manual Advanced
/FB2/ Function Manual Extended Functions; Grinding (W4).
50
Polynomial No.
Low limit,
High limit,
a0,
a1,
a2,
a3)
+ a x+ a x a x
2 + 3
0 1 2 3
Lower limit, n: Polynomial number
Upper limit, n: Polynomial number
a0-coefficient, n: Polynomial number
a1-coefficient, n: Polynomial number
a2-coefficient, n: Polynomial number
a3-coefficient, n: Polynomial number
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions