C3-15
IM 34M06H62-02E 2nd Edition : June 2008-00
C3.10 Input Filtering
The input filtering function removes noise from input signals.
It is especially useful for removing high frequency noise from flow rate or pressure input
signals.
When a larger time-constant is specified for this function, more noise is removed and the
input signal becomes cleaner and more stable. On the other hand, a larger time-constant
provides more input filtering, making the module less responsive to changes in the input
signal. Thus the Input Filter parameter should be set to the minimum required value. (see
Figure C3.6)
The input filter performs 1st order delay calculation for filtering.
Time
Original waveform
When filtered with a small time-constant
When filtered with a large time-constant
Input value
Figure C3.6 How Input Filtering Affects Input Signal
Table C3.14 Input Filter Parameter
Data Position Number
Symbol Description Unit Data Range Default Value
Attribute
Stored
Loop 1
Loop 2
Loop 3
Loop 4
172 372 572 772 FL Input filter Second 0: OFF, 1 to 120 s 0 RW
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