Bfm #43 (Ch1) And Bfm #62 (Ch2): Primary Delay Digital Filter Setting - Mitsubishi Electric MELSEC FX2N-2LC User Manual

FX2N-2LC Temperature Control Block
7.2.26

BFM #43 (CH1) and BFM #62 (CH2): Primary delay digital filter setting

In BFM #43, set the primary delay digital filter of CH1. In BFM #62, set the primary delay digi-
tal filter of CH2.
The FX -2LC is equipped with the software input filter so that fluctuation of the measured
2N
value (PV) caused by noise can be reduced. The time constant of this input filter can be set in
accordance with the characteristics of the control target and the noise level.
If the time constant is too small, the input filter cannot give required effect. If the time constant
is too large, the input responsibility is deteriorated.
The allowable set range is from 0 to 100 sec. When BFM #43/#62 is set to "0", the filter func-
tion is disabled.
While the filter function is disabled, data is acquired in the sampling cycle (500 ms).
Input of actual measured value (PV)
Input of measured value (PV) processed
by the primary delay digital filter
Pulse input caused by noise
Input amplitude
Amplitude
processed by
the filter
Buffer Memory (BFM) 7
7-16