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FX2N-5A Special function block Buffer Memory (BFM) 7
7-28
7.2.17 BFM 26 Upper/lower limit value alarm status (READ only)
If the upper/lower limit value detection function (BFM 22 b0, b1) is used, the detection results
are written to BFM 26.
The lower limit value alarm or the upper limit value alarm of each channel is assigned to each
bit of BFM 26.
If the A/D averaged conversion data of a channel (BFM 6 to BFM 9) is outside the range set
between the lower limit value (BFM 71 to BFM 74) and the upper limit value (BFM 81 to BFM
84), the corresponding alarm bits b0 to b7 for each channel (lower limit alarm or higher limit
alarm) are set in BFM 26.
If the A/D immediate conversion data of a channel (BFM 10 to BFM 13) is outside the range set
between the lower limit value (BFM 71 to BFM 74) and the upper limit value (BFM 81 to BFM
84), the corresponding alarm bits b8 to b15 for each channel (lower limit alarm or higher limit
alarm) are set in BFM 26.
Once a bit turns ON, it remains ON until it is reset by BFM 99 or the power is turned off.
Even while an upper/lower limit value alarm is detected, the data (BFM 6 to BFM 13) of each
channel are continuously updated.