FX2N-5A Special function block Buffer Memory (BFM) 7
7-30
7.2.18 BFM 27 A/D data sudden change detection status (READ only)
When the sudden change detection function is used, the detection result is written to BFM 27.
The sudden change detection is activated, if the values in BFM 91 to BFM 94 are bigger than
0.
The sudden change detection in + direction or the sudden change detection in - direction of
each channel is assigned to each corresponding bit of BFM 27. When the immediate data
(BFM 10 to BFM 13) of each channel is updated, if the difference between the previous value
and the new value is larger than the sudden change detection set value (BFM 91 to BFM 94),
the corresponding bit turns ON.
When the new value is larger than the previous value, a bit for the + direction turns ON. If, the
new value is smaller than the previous value, a bit for the - direction turns ON.
Once a bit turns ON, it remains ON until it is reset by BFM 99 or the power is turned off.
Even while a sudden change alarm is detected, the data (BFM 6 to BFM 13) of each channel is
continuously updated.
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