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FX2N-8AD Analog input block Buffer Memory (BFM) 8
8-22
8.2.10 BFM #27: A/D data sudden change detection status
When you use the sudden change detection function (BFM #22 b2), the detection result is
written to BFM #27.
The sudden change detection + direction or the sudden change detection - direction of each
channel is assigned to each bit of BFM #27. When the data (BFM #10 to BFM #17) 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 #98), the corresponding bit turns ON.
At this time, when the new value is larger than the previous value, a bit for the + direction turns
ON. when 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 error is detected, the data (BFM #10 to BFM #17) of each channel
is continuously updated.
Table 8.3: Bit assignment in BFM #27
Bit
No.
Channel
No.
Description
Bit
No.
Channel
No.
Description
b0
CH1
Sudden change error in - direction
b8
CH5
Sudden change error in - direction
b1
Sudden change error in + direction
b9
Sudden change error in + direction
b2
CH2
Sudden change error in - direction
b10
CH6
Sudden change error in - direction
b3
Sudden change error in + direction
b11
Sudden change error in + direction
b4
CH3
Sudden change error in - direction
b12
CH7
Sudden change error in - direction
b5
Sudden change error in + direction
b13
Sudden change error in + direction
b6
CH4
Sudden change error in - direction
b14
CH8
Sudden change error in - direction
b7
Sudden change error in + direction
b15
Sudden change error in + direction