Bfm#2 To #5: Averaging Time - Mitsubishi Electric MELSEC-FX3S Series Manual

FX /FX /FX /FX /FX
3S 3G 3GC 3U 3UC
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC
5.4.2

BFM#2 to #5: Averaging time

To change the channel data type from the immediate data (channels 1 to 4: BFM#10 to #13) to the average
data, set the desired averaging time (channels 1 to 4 : BFM#2 to 5).
The relation between the set averaging time and the corresponding operation is shown in the following table.
Averaging
time (BFM#2
to #5)
Immediate data
0 or less (Each time the A/D conversion is performed, the channel
data will be updated.)
Immediate data
1 (initial
(Each time the A/D conversion is performed, the channel
value)
data will be updated.)
Average data
(Each time the A/D conversion is performed, the average
2 to 400
value will be calculated and the channel data will be
updated.)
Average data
(Each time the A/D conversion data reaches the averaging
401 to 4095
time, the average data will be calculated and the channel
data will be updated.)
Average data
(Each time the A/D conversion data reaches the averaging
4096 or more
time, the average data will be calculated and the channel
data will be updated.)
1. Application
If the measurement signal contains comparatively reduced ripple noise, such as supply voltage frequency,
averaging will result in obtaining of stable data.
2. Cautions regarding averaging time setting
• To use the averaging function, be sure to set the digital filter of the corresponding channel to "0". (Digital
filter setting: BFM#6 to #9 for channels 1 to 4)
To use the digital filter function, be sure to set the averaging time of the corresponding channel to "1".
(Averaging time: BFM#2 to #5 for channels 1 to 4)
If the averaging time is set to a value other than "1" and the digital filter (BFM#6 to #9 for channels 1 to 4)
is set to a value other than "0", the digital filter setting error (b11 of BFM#29) will occur.
• If one of the channels uses the digital filter, the A/D conversion time will be set to 5 ms for all the channels.
• If the averaging time is out of the setting range, the averaging time setting error (b10 of BFM#29) will occur.
• If the averaging time is set, the data history function cannot be used.
PLC User's Manual - Analog Control Edition
→ For a detailed description of channel data update timing, refer to Subsection 5.4.4.
Channel data (BFM#10 to #13) type
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Setting range: 1 to 4095
Initial value: K1
Numeric data type: Decimal (K)
Error descriptions
K0 will be set, and the averaging time
setting error (b10 of BFM#29) will
occur.
-
-
-
4096 will be set, and the averaging
time setting error (b10 of BFM#29) will
occur.
A
B
C
D
E
F
G
H
I
J
B-27