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3 SPECIFICATIONS
3.2.1 Temperature conversion system
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There are two temperature conversion systems, sampling processing and averaging
processing.
(1) Sampling processing
A temperature input value is converted into a temperature one by one and its
digital output value is stored into buffer memory.
Sampling processing time varies with the number of used channels (number of
channels set to enable temperature conversion).
(Processing time) = (number of used channels)
[Example]
Sampling time is 120ms when three channels, channels 1, 2 and 4, are enabled for
conversion.
3 channels
(2) Averaging processing
The temperatures of the channels specified for averaging processing are
converted by the preset count or for the preset period of time, the sum of the
resultant values except the maximum and minimum values is averaged, and the
result is stored into buffer memory.
(a) Time-specified averaging processing
The processing count within the preset time varies with the number of used
channels (number of channels set to enable temperature conversion).
(Processing count) =
[Example]
The sampling count is 4.75 when four channels, channels 1, 2, 3 and 4, are
enabled for conversion and the preset time is 760ms.
760ms ÷ (4 channels
Since the fractional portion of an indivisible value is dropped, the sampling
count is 4 times.
(b) Count-specified averaging processing
The time taken to store a count-averaged value into buffer memory varies
with the number of used channels (number of channels set to enable
temperature conversion).
(Processing time) = (preset count)
[Example]
An average value is output ever 320ms when two channels, channels 3 and 4,
are enabled for conversion and the preset count is 4.
4 times
(2 channels
40ms = 120ms
(number of used channels)
40ms) = 4.75
(number of used channels)
40ms) = 320ms
MELSEC-Q
(40ms)
(preset time)
(40ms)
(40ms)
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