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FX2N-8AD Analog input block Buffer Memory (BFM) 8
8-19
8.2.7 BFM #22: Sets convenient functions
The functions described below are assigned to b0 to b3 of BFM #22. When a bit is set to ON,
the assigned function becomes valid.
When a bit is set to OFF, the assigned function becomes invalid.
b0: Data addition function
The data (BFM #10 to BFM #17), the peak value (BFM #101 to BFM #108, BFM #111 to
BFM #118) and the data history (BFM #200 to BFM #3399) of each channel become
the measured value added by the addition data (BFM #61 to BFM #68).
When using this function, write the value added by the addition data (BFM #61 to BFM
#68) to the lower limit value error set value (BFM #71 to BFM #78) and the upper limit
value error set value (BFM #81 to BFM #88).
The addition data (BFM #61 to BFM #68) is not added to the scale over data (BFM #28).
b1: Upper/lower limit value detection function
When the A/D conversion data of each channel is outside the range from the lower limit
value error set value (BFM #71 to BFM #78) to the upper limit value error set value (BFM
#81 to BFM #88), the result is written to the upper/lower limit value error status (BFM #26).
b2: Sudden change detection function
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 result is written to the sudden change
detection status (BFM #27).
b3: Peak value hold function
The minimum value of the data (BFM #10 to BFM #17) of each channel is written to
BFM #101 to BFM #108, and the maximum value is written to BFM #111 to BFM #118.