TOHO ELECTRONICS TTM200 - Manual (Page 159)

48-7009-E 6-11
■ PV filter setting
SEt02
INP2
Setting content Initial value
6 PdF2 0.0 to 99.9 (seconds) 0.0
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.
100%
0%
Time
100%
0%
Time
100%
0%
Time
63%
Time constant (t)
■ 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
SEt02
INP2
Setting content Initial value
7 LR
0 Local
0 1 Remote 1 (scaling at SLL , SLH)
2 Remote 2 (scaling at FSL 2, FSH 2)