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FX2N-8AD Analog input block Buffer Memory (BFM) 8
8-33
8.2.19 BFM #91 to BFM #98: Sudden change detection set value
When using the sudden change detection function (BFM #22 b2), write the set value to judge
the sudden change.
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).
Setting range
The setting range varies depending on the setting of the input mode (BFM #0, BFM #1).
The table below shows the setting range in each input mode.
Write the set value in a digital value.
Table 8.11: Setting range
Input mode (BFM #0, BFM #1) Setting range Initial value
0: Voltage input mode (-10 to +10 V), resolution 10 V x 1/16,000 1 to 16383 1600
1: Voltage input mode (-10 to +10 V), resolution 10 V x 1/4,000 1 to 4095 400
2: Voltage input mode, analog value direct display (-10,000 to +10,000)
1 to 10000 1000
3: Current input mode (4 to 20 mA), resolution 20 mA x 1/8,000 1 to 4095 400
4: Current input mode (4 to 20 mA), resolution 20 mA x 1/4,000 1 to 2047 200
5: Current input mode, analog value direct display (4,000 to 20,000) 1 to 8191 800
6: Current input mode (-20 to +20 mA), resolution 20 mA x 1/8,000 1 to 8191 800
7: Current input mode (-20 to +20 mA), resolution 20 mA x 1/4,000 1 to 4095 400
8: Current input mode, analog value direct display (-20,000 to +20,000)
1 to 20000 2000
9: Thermocouple input mode (K type), Celsius display 1 to 6500 650