Feedrate Control - Siemens SINUMERIK 840D sl Function Manual

4.3.2

Feedrate control

Example of adaptive control with an analog input voltage
A process quantity (measured via $A_INA[1]) is to be controlled at 2 V using an additive control
factor implemented by a path (or axial) feedrate override. Feedrate override is to be performed
within the range of +100 [mm/min].
Figure 4-2
Determining the coefficients:
y = f(x) = a
a1 = - 100mm / (1min * 1V)
a1 = - 100% control constant, gradient
a0 = - (-100) * 2 = 200
a2 = 0 (not a square component)
a3 = 0 (not a cubic component)
upper limit = 100
Lower limit = -100
FCTDEF(
Synchronized actions
Function Manual, 08/2018, 6FC5397-5BP40-6BA2
Diagram illustrating adaptive control
+ a x +a x + a x
2 3
0 1 2 3
Polynomial
LLIMIT,
ULIMIT,
a ,
0
a ,
1
; y for x = 0
; gradient
4.3 Examples of adaptive control
Examples
141