12-17
ET 200L, ET 200L-SC and ET 200L-SC IM-SC Distributed I/O Device
EWA 4NEB 780 6009-02c
The smoothing is adjustable in 4 steps. Smoothing factor k multiplied by the
cycle time of the electronic module corresponds to the time constant of the
smoothing filter.
Smoothing factor: k:
None
1
Weak
8
Medium
64
Strong
128
You can calculate the time response for any jump of the input value x and the
smoothing factor k by using the following formula:
yn :
+
xn
)
(k – 1) yn–1
k
y
n
= value passed to system in cycle n
Figure 12-9 shows the jump response for various smoothing factors, depend-
ing on the number of module cycles.
0.5
1
0
0.63
100
200
300
400
Module cycles
Jump Response
k = 8
k = 64
k = 128
Figure 12-9 Jump Response
Time Response of
the Digital
First-Order
Low-Pass Filter
Calculation of the
Time Response
Jump Response
SC Analog Electronic Modules – T
echnical Data
