A/D Conversion Methods - Mitsubishi Electric Melsec Q Series User Manual

3 SPECIFICATIONS

3.2.1 A/D conversion methods

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There are two A/D conversion methods, sampling processing and averaging processing.
(1) Sampling processing
A/D conversion is performed successively for the analog input value, and the
converted Digital output value is stored in the buffer memory.
The sampling processing time depends on the number of channels used (the
number of channels set to A/D conversion enable) and whether the temperature
drift compensation function is available.
(a) Without the temperature drift compensation function
(Processing time) = (Number of channels used)
(b) With the temperature drift compensation function
(Processing time) = (Number of channels used)
s
[Example]
When three channels (channels 1, 2 and 4) are A/D conversion enabled with the
temperature drift compensation function, the sampling processing time is 400
3 80 + 160 = 400 (
(2) Averaging processing
For channels for which averaging processing is specified, A/D conversion is
performed for the set number of times or the set amount of time. The average
value is calculated from the sum of values excluding the maximum and minimum
values, and then stored in the buffer memory.
80 (
s)
MELSEC-Q
80 ( s/1 channel)
s/1 channel) + 160
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s.