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FX2N-5A Special function block Buffer Memory (BFM) 7
7-32
7.2.19 BFM 28 Scale over status (READ/WRITE)
When the analog input value of each channel (BFM 10 to BFM 13) is outside the maximum
range of the A/D converter, arange error alarm is written to BFM 28. This will also happen if a
sensor is disconnected and ±100mV mode has been selected.
Additionally, the alarm is set if the Scaling function is used and the conversion result is outside
the specified values for this channel.
To avoid the alarm being set for unused channels, they should be completely disabled in BFM
0. It is also possible to inhibit only the scale over alarm by setting the corresponding bits of
BFM22.
Once a bit turns ON, it remains ON until it is overwritten with the OFF status using a TO
instruction to BFM 28 or the power is turned off. Single alarm bits can be masked, by writing a
bit mask code to BFM 28. For example, HFFF0 will only clear the lowest 4 bits.
Even while a scale over error is detected, the data (BFM 6 to BFM 13) of each channel is
continuously updated.