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B-32
5 Buffer Memory (BFM)
5.4 Buffer Memory Details
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD/FX3UC-4AD (4-channel Analog Input)
5.4.8 BFM #22: Convenient function setting
Initial value: H0000
Numeric data type: Hexadecimal (H)
Turn on each bit (b0 to b8) of BFM #22 to enable the function assigned to each bit (refer to the following
table). Turn off each bit to disable the function of each bit.
1. Function assigned to each bit of BFM #22
Bit No. Function Description Reference
b0 Data addition function
The channel data (BFM #10 to #13), peak data (BFM #101 to
#104, #111 to #114), and data history (BFM #200 to #6999) will
be subject to change (the addition data (BFM #61 to #64) will be
added to the measurement data).
When setting the lower limit error data (BFM #71 to #74) or the
upper limit error data (BFM #81 to #84), add the addition data
(BFM #61 to #64) to the error data to be set.
Subsection
5.4.15
b1
Upper/lower limit
detection function
If the A/D conversion data of a channel is outside the range set
by the lower limit error data (BFM #71 to #74) and the upper limit
error data (BFM #81 to #84), the result will be written to BFM
#26 as the upper/lower limit error status data.
Subsection
5.4.16
b2
Abrupt change
detection function
When channel data (BFM #10 to #13) is updated, if the
difference between the previous value and the new value is
larger than the set abrupt change detection value (value set in
BFM #91 to #94), the result will be written to BFM #27 as the
abrupt change detection status data.
Subsection
5.4.17
b3
Peak value holding
function
The minimum value of channel data written to BFM #10 to #13
will be written to BFM #101 to #104 as the minimum peak value,
and the maximum value of channel data written to BFM #10 to
#13 will be written to BFM #111 to #114 as the maximum peak
value.
Subsection
5.4.19
b4
Peak value automatic
transfer function
If the automatic transfer-to first data register is specified in BFM
#125, the minimum peak value (BFM #101 to #104) and the
maximum peak value (BFM #111 to #114) will be automatically
written to the specified data registers (8 points (registers)
starting from the first data register specified).
Subsection
5.4.19
Subsection
5.4.21
b5
Upper/lower limit error
status data automatic
transfer function
If the upper/lower limit error status data automatic transfer-to
data register is specified in BFM #126, the upper/lower limit error
status data (BFM #26) will be automatically written to the
specified data register.
Subsection
5.4.16
Subsection
5.4.22
b6
Abrupt change
detection status data
automatic transfer
function
If the abrupt change detection status data automatic transfer-to
data register is specified in BFM #127, the abrupt change
detection status data (BFM #27) will be automatically written
to
the specified data register.
Subsection
5.4.17
Subsection
5.4.23
b7
Over-scale status
data automatic
transfer function
If the over-scale status data automatic transfer-to data register is
specified in BFM #128, the over-scale status data (BFM #28) will
be automatically written to the specified data register.
Subsection
5.4.24
b8
Error status data
automatic transfer
function
If the error status data automatic transfer to data register is
specified in BFM #129, the error status data (BFM #29) will be
automatically written to the specified data register.
Subsection
5.4.25
b9 to b15 - Not used. -