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For the time average, the valid lower limit value to be set is given by: Minimum number of processing times, or 4 × Sampling
period.
Example: A maximum of 4 channels is used (conversion speed: 1ms/channel)
(1ms × 4) × 4 = 16ms
If the number of processing times falls below four due to the set time, an error occurs (error code: 020), where the digital
operation value becomes 0.
(b) Count average
This processing performs A/D conversion for a set number of times and averages the total excluding the
maximum and minimum values, storing the average value into CH Digital operation value (RWr2 to RWr5,
RWr12 to RWr15).
The time taken to store the average value obtained by count average into CH Digital operation value (RWr2
to RWr5, RWr12 to RWr15) varies depending on the sampling period.
Processing times assuming the following settings with no extension module connected:
20 × (4 × 0.4) = 32.0 (ms)
→ An average value is output every 32.0 ms.
Because the count average requires a sum of at least two counts except the maximum and minimum values, the set number
of times should be set to four or more.
Item Setting
Number of channels used (number of channels where A/D conversion is enabled) 4 channels (CH1 to CH4)
Conversion speed 400μs/channel
Set number of times 20 times
Number of processing times = Set number of times × Sampling period
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