Instruction Manual

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
(| | )xy11- <<= d
is:
Fp
pT
()=
+×
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:
yt
T
Tts
yt ts
ts
Tts
xt11 1() ( ) ()=
+
×-+
+
×
ts sampling interval x(t)
T time constant x1(t-ts)
Inputs/outputs
Digital input
reset
=0
||xy11-<
Diff delay effective
=0
||xy11->
Diff delay switched off
reset
=1
||xy11- <<=
Diff delay switched off
=1
||xy11->
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
Tt
X
Y
2*Diff
Fig. 7