Mitsubishi MELSEC-Q Series User Manual page 29

3
SPECIFICATIONS
3.2.1 Temperature conversion system
Temperature measurement timing within conversion period is below.
Temperatures of CH1 to CH8 are measured one by one for 40ms per channel, regardless
of the conversion enable/disable setting (Un\G0).
When the temperature of a channel is measured, if the conversion enable/disable setting
(Un\G0) of the channel is set to "Enable", the measured temperature value is stored in
CH measured temperature value (Un\G11 to Un\G18). When the setting is set to
"Disable", the measured temperature value is not stored.
Regardless of the number of conversion-enabled channels, measured temperature values
are stored in the buffer memory at every 320ms.
Conversion processing when setting CH1, CH2, and from CH4 to CH8 to "Enable", and
CH3 to "Disable" is below.
CH8 CH1 CH2
40ms 40ms
Updates
CH1
measured
temperature
value
(1) Sampling processing
Measured temperature value that is measured at every 320ms of sampling period is
stored in the buffer memory.
(2) Averaging processing
Averaging processing requires at least 2 times of conversion processing excluding the
maximum and the minimum values.
After the first averaging processing is completed, the corresponding bit for a channel
where processing has been completed of the Conversion completion flag (Un\G10)
turns ON (changes to "1").
(a) Time average
Conversion period (320ms)
CH3 CH4
40ms 40ms
Updates No processing
Updates
CH2 for CH3
CH4
measured
measured
temperature
temperature
value
value
Conversion is executed for a period of set time, and the total value, which
excludes the maximum and the minimum values, is averaged and stored in the
buffer memory.
The number of processing times within the set time is below.
Number of processing times = set time
Setting range of time average is 1280 to 5000ms.
When setting a value out of the setting range, an error (error code 20 ) occurs.
[Example]
When six channels, channels 1, 2, 3, 4, 5, 6, are enabled for conversion and the
set time is 2000ms, measurement is executed for six times and the average value
is output.
2000 320 =6.25 (times)...... Drop the fractional part
CH5 CH6 CH7
40ms 40ms 40ms
Updates Updates Updates
CH5 CH6
measured measured measured
temperature temperature temperature
value
value
320
3.2 Function List
3.2.1 Temperature conversion system
CH8 CH1
40ms
Updates
CH7 CH8
measured
temperature
value
value
3
- 6
1
2
3
4
5
6
7
8