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FX2N-8AD Analog input block Buffer Memory (BFM) 8
8-20
8.2.8 BFM #24: Specifies high-speed conversion channel
When using only the voltage input mode and the current input mode, you can improve the A/D
conversion timing (to 1/4 of the normal timing) for only one channel among CH1 to CH8.
However, the conversion timing becomes slower in other channels (to twice of the normal
timing).
To select a channel, write "K1" (for CH1) to "K8" (for CH8) to BFM #24.
(When you write "K0", the high-speed conversion function is not available.)
• When the thermocouple input mode is used in one or more channels, the high-speed
conversion function is not available.
Example: When BFM #24 is set to "K1"
Conversion channel
1 2 1 3 1 4 1 5 1 6 1 7 1 8
Conversion timing of CH1: 500
µ
s x 2 = 1 ms
Conversion timing of other channels: 500
µ
s x 2 x 8 (CH) = 8 ms
(Usual conversion timing of each channel: 500
µ
s x 8 (CH) = 4 ms)