Filt 131, Filter with tolerance band 131 – West Control Solutions KS98-1 User Manual
Page 131
III-6.6
FILT ( filter with tolerance band (No. 55) )
The complex transfer function of the filter within a tolerance band around the last output value ( |
|
)
x
y
1
1
- <<= d is:
F p
p T
( )
=
+ ×
1
1
With a difference higher than
Diff or reset = 1 between input x1 and output y2, the filter stage is switched off
and the output follows the input directly.
With a difference of input x1 and output y1 smaller than
Diff and reset = 0, the output follows an e-function
with time constant T. The output variable is calculated according to the following equation:
y t
T
T
ts
y t
ts
ts
T
ts
x t
1
1
1
( )
(
)
( )
=
+
Ч
- +
+
Ч
ts sampling interval
x(t)
T
time constant
x1(t-ts)
Inputs/outputs
Digital input
reset
= 0 |
|
x
y
1
1
- < Diff
delay effective
= 0 |
|
x
y
1
1
- >Diff
delay switched off
reset
= 1 |
|
x
y
1
1
- <<= Diff
delay switched off
= 1 |
|
x
y
1
1
- >Diff
delay switched off
Analog input
x1
Input variable to be delayed
Analog output
y1
Delayed output variable
Parameters:
Parameter
Description
Range
Default
T
Time constant in s
0...199999
1
Diff
Tolerance band
}
0...999999
1
Time functions
9499-040-82711
III-131
FILT ( filter with tolerance band (No. 55) )
T
x1
y1
?1
Diff
reset
X/Y
T
t
X
Y
2*Diff
Fig. 7