Chap. 6 Analog I/O Module (XBF-AH04A)
6.6.2 Filtering Function
The input value of the designated channel is calculated with previously filtered input value using
preset filter constant (time constant 63.2%) by the formula below;
).1(tan
).1(Pr)tan(Pr
Pr
UsedofChannelsNomstFilterCons
UsedofChannelsNomsesentInputtFilterConstlteredInpueviouslyFi
teredInputesentlyFil
×+
××+×
=
Filter Constant setting range = 4 ~ 64000 [ms]
Input
1000
632
0
Input after filtration
Actual input
Filter Constant
(ms)
Time (ms)
In the above graph, if the input value changes rapidly from 0 to 100, the input value is filtered.
Filter (time) constant is the time required for input values to vary by 63.2% of the actual input
value.
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