Справочник Пользователя для Mitsubishi Electronics MELSEC-F
B-30
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-4AD/FX
3UC
-4AD (4-channel Analog Input)
5.4.4
BFM #10 to #13: Channel data
Numeric data type: Decimal (K)
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.
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.
→ 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.
*1.
"500
μs" 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.
all the channels.
Averaging
time
(BFM #2 to #5)
Digital filter
function
(BFM #6 to #9)
Channel data (BFM #10 to #13) update timing
Channel data type
Update timing
0 or less
0 (The digital filter
will not be used.)
will not be used.)
Immediate data
"0" will be set, and the
averaging time setting error
(b10 of BFM #29) will occur.
"0" will be set, and the
averaging time setting error
(b10 of BFM #29) will occur.
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
data will be updated.
The update timing will be as follows:
Update time = 500
μs
*1
× Number of
selected channels
1
0 (The digital filter
will not be used.)
will not be used.)
Immediate data
1 to 1600
(The digital filter
will be used.)
(The digital filter
will be used.)
Immediate data
The digital filter function will
be used.
The digital filter function will
be used.
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
data will be updated.
The update timing will be as follows:
Update time = 5ms
× Number of selected
channels
2 to 400
0 (The digital filter
will not be used.)
will not be used.)
Average data
Each time the A/D conversion is performed, the
data will be updated.
The update timing will be as follows:
data will be updated.
The update timing will be as follows:
Update time = 500
μs
*1
× Number of
selected channels
401 to 4095
Average data
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:
the set averaging time, the data will be updated.
The update timing will be as follows:
Update time = 500
μs
*1
× Number of
selected channels
× Averaging time
4096 or more
Average data
"4096" 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.