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 det 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
Summary of Contents for FX2N-8AD
Page 4: ...FX2N 8AD Analog input block ii ...
Page 8: ...FX2N 8AD Analog input block vi ...
Page 14: ...FX2N 8AD Analog input block External Dimensions 2 2 2 MEMO ...
Page 16: ...FX2N 8AD Analog input block Part Name 3 3 2 MEMO ...
Page 20: ...FX2N 8AD Analog input block Connection to PLC 5 5 2 MEMO ...
Page 24: ...FX2N 8AD Analog input block Wiring 6 6 4 MEMO ...
Page 70: ...FX2N 8AD Analog input block Buffer Memory BFM 8 8 42 MEMO ...
Page 84: ...FX2N 8AD Analog input block Example program 10 10 6 MEMO ...
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