Siemens SINUMERIK 828D Programming Manual page 584

Motion synchronous actions
10.4 Actions in synchronized actions
DO SYNFCT
Polynomial No.
Main run variable
output
Main run variable
input
Example of adaptive control (additive)
Additive influence on the programmed feedrate
A programmed feedrate is to be controlled additive using the current of the X axis (infeed
axis):
The feedrate should only vary by +/- 100 mm/min and the current fluctuates by +/-1A around
the working point of 5A.
1. Polynomial definition
Determination of the coefficients
y = f(x) = a
a = -100mm/1 min A
1
a = -(-100)*5 =500
0
a = a
2
Upper limit = 100
Lower limit = -100
This means:
FCTDEF(1,-100,100,500,-100,0,0)
584
Activation of the evaluation function
With polynomial defined with FCTDEF (see Subsection
"Polynomial definition").
Write main run variable
Read main run variable
+ a x + a x + a
2
0 1 2 3
= 0 (no square and cubic component)
3
x
3
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
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