Mitsubishi Electric MELSEC iQ-R Series User Manual page 22

■Count average
A temperature input module executes the conversion for a set number of times and averages the total value excluding the
maximum value and the minimum value. The calculated value is stored in the buffer memory area.
The time taken to store the average value obtained by the processing in the buffer memory area varies depending on the
number of channels where the conversion is enabled.
Processing time = Set number of times  (Number of conversion enabled channels  Conversion speed)
Ex.
How to calculate the processing time for the thermocouple input module is shown using the settings in the table below.
Item
Number of channels where temperature conversion is enabled
Set number of times
5 (times)  4 (CH)  30 (ms) = 600 (ms)
A mean value is output every 600ms.
Because the count average requires a sum of at least two counts excluding the maximum and minimum
values, the set number of times should be four or more.
■Moving average
A temperature input module averages measured temperature values taken at every sampling cycle for a specified number of
times, and stores the averaged value in the buffer memory area.
Because the target range for averaging processing is moved in response to every sampling processing, the latest measured
temperature value is constantly obtained.
The following figure shows the moving average processing of when the set number of times is five.
Temperature input value (­)
'CH1 Measured temperature value'
(Un\G400)
'Conversion completed flag'
(XE)
1 FUNCTIONS
20
1.4 Temperature Conversion Method
(3) (4)
1820
(2)
(1)
0
0
OFF
Data transition in buffer memory
1st storage (a)
(1) + (2) + (3) + (4)+ (5)
5
Setting
Four channels (CH1 to CH4)
Five times
Sampling cycle
(5)
(6)
(8) (9)
(7)
(10) (11)
1st storage (a)
2nd storage (b)
3rd storage (c)
(a) (b) (c)
ON
2nd storage (b) 3rd storage (c)
(2) + (3) + (4) + (5)+ (6) (3) + (4) + (5) + (6)+ (7)
5
(12)
Time (ms)
5