West Control Solutions KS98-1 - Manual (Page 128)

III-6.3 LAG1 ( filter (No. 52))
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:
( ) ( ) ( )
y t
T
T t
y t t
t
T t
x t
s
s
s
s
1 1 1
=
+
Ч - +
+
Ч
ts sampling interval x1 (t) instantaneous x1
T time constant x1(t-ts) y1 after t n ts
= ×
n number of calculation cycles y1(t-ts) previous y1
The complex transfer function is:
( )
F p
p t
=
+ ×
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!
9499-040-82711 Time functions
LAG1 ( filter (No. 52)) III-128
T
reset
x1
y1