14.3 LAG1 ( filter )
Dependent of control input reset, input variable x1 is passed on to output y1 with delay (reset= 0) or without delay (re-
set = 1). Delay is according to a 1st order e-function ( 1st order low pass ) with time constant T(s). The output variable
for reset= 0 is calculated according to the following equation:
() () ()
yt
T
Tt
yt t
t
Tt
xt
s
s
s
s
11 1
=
+
×-+
+
×
ts sampling interval x1 (t) instantaneous x1
T time constant x1(t-ts) y1 after
tnts=×
n number of calculation cycles y1(t-ts) previous y1
The complex transfer function is:
()
Fp
pt
=
+×
1
1
Inputs/outputs:
Digital input
reset
= 0 means that input signal x1 is output without delay at output y1.
= 1 means that input signal x1 is output at output y1 according to the calculated e-function.
Analog input
x1
Input variable to be calculated
Analog output
y1
Delayed output variable
Parameter:
Parameter Description Range Default
T
Time constant in s 0...199999 1
No configuration parameters!
9499 040 50611 Time functions
79 LAG1 ( filter )
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