Bfm#10 To #13: Channel Data - 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
5.4.4

BFM#10 to #13: Channel data

Use these buffer memories to store the A/D converted digital values.
The channel data (BFM#10 to #13 for channels 1 to 4) and the data update timing will depend on the set
averaging time (BFM#2 to #5 for channels 1 to 4) or the digital filter setting condition (BFM#6 to #9 for
channels 1 to 4) as shown in the following table.
Averaging
time
(BFM#2 to #5)
0 (The digital filter
0 or less
will not be used.)
0 (The digital filter
will not be used.)
1
1 to 1600
(The digital filter
will be used.)
2 to 400
0 (The digital filter
will not be used.)
401 to 4095
4096 or more
*1. "500μs" represents the A/D conversion time.
However, if one of the channels uses the digital filter function, the A/D conversion time will be 5 ms for
all the channels.
PLC User's Manual - Analog Control Edition
→ For a detailed description of the averaging time, refer to Subsection 5.4.2.
→ For a detailed description of digital filter functions, refer to Subsection 5.4.3.
Digital filter
function
Channel data type
(BFM#6 to #9)
Immediate data
"0" will be set, and the
averaging time setting error
(b10 of BFM#29) will occur.
Immediate data
Immediate data
The digital filter function will
be used.
Average data
Average data
Average data
"4096" will be set, and the
averaging time setting error
(b10 of BFM#29) will occur.
Numeric data type: Decimal (K)
Channel data (BFM#10 to #13) update timing
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
Update time = 500μs
selected channels
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
Update time = 5ms × Number of selected
channels
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
Update time = 500μs
selected channels
Each time the A/D conversion is performed for
the set averaging time, the data will be updated.
The update timing will be as follows:
Update time = 500μs
selected channels × Averaging time
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
Update timing
*1
× Number of
*1
× Number of
*1
× Number of
B-29
A
B
C
D
E
F
G
H
I
J