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3 SPECIFICATIONS
3.2.1 Temperature conversion system
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(1) Sampling processing
A temperature input value is converted into a temperature one by one and its
measured temperature 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
(a) Time-specified averaging processing
When this option is specified for a channel, values input from the channel
are converted into temperature values consecutively for the preset length of
time. Then, the total amount of values after eliminating the maximum and
minimum values is averaged to be stored into the buffer memory.
Averaging processing requires at least 2 times of conversion processing
excluding the maximum and the minimum values.
The processing count within the preset time varies with the number of used
channels (number of channels set to enable temperature conversion).
(Processing count) =
Setting range of preset time is 160 to 5000ms.
When setting a value out of the setting range, an error (error code 20 )
occurs.
[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)
Setting range of preset count is 4 to 62500times.
When setting a value out of the setting range, an error (error code 30 )
occurs.
[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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Troubleshooting
