
48-7009-E 6-11
■ PV filter setting
The PV filter setting is a function that demonstrates the CR filter effect on software through performing a first-order lag
calculation for PV of the remote SV input.
The filter effect is set using the time constant [t].
(Time constant is defined as the time required for PV to reach about 63 % when an input changes in a step configuration.)
* CR filter --- a filter of first-order lag
Note Application of PV filter
(1) Effect of noise is alleviated due to elimination of high-frequency noise when electric noise applies on inputs.
(2) Response can be delayed against abrupt change of an input.
■ Input signal
■ Input read in
When no digital PV filter exists
[Time constant (t) = 0]
When a digital PV filter exists
[Time constant (t) > 0]
■ Local/remote switchover
Remote 1 (scaling at SLL , SLH)
Remote 2 (scaling at FSL 2, FSH 2)
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