Moving Average Processing; Scaling Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.21

Moving Average Processing

Moving average processing can be set to a temperature process value (PV). With this function, the fluctuation of the
temperature process value (PV) can be reduced in an electrically noisy environment or in the environment where the
temperature process value (PV) fluctuates greatly.
To hasten the response of the temperature process value (PV), disable the moving average processing.
Setting method
Configure the settings.
1.
Set "Enable" for the following setting:
[Navigation window]  [Parameter]  Target module  [Base Setting]  [Moving averaging process setting]
2.
Set the number of times to execute the moving average processing by the following procedure:
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Number of moving averaging]
• When "Disable" has been set for "Moving averaging process setting" in "Base Setting," the value set for
"Number of moving averaging" in "Application Setting" is ignored.
• For the module, the moving average processing is enabled and the number of times to execute the moving
average processing has been set to 2 times as default. Change the settings if necessary.
1.22

Scaling Function

This function can convert temperature process values (PV) into the set width to import them in the buffer memory. For
example, the range of -100 to 100 can be scaled into the range of 0 to 4000.
Scaling target
Usually, 'CH1 Temperature process value (PV)' (Un\G402) is the scaling target. However, values of other analog modules
(such as an A/D converter module) on the system can be set as the scaling targets by setting a 200s value for "Input range
setting" of "Control basic parameters" in "Application Setting." For details, refer to the following:
Page 71 Setting method
This section uses 'CH1 Temperature process value (PV)' (Un\G402) as the scaling target for explanation. To
scale a value input from other analog modules (such as an A/D converter module), replace 'CH1 Temperature
process value (PV)' (Un\G402) with 'CH1 Temperature process value (PV) for input with another analog
module' (Un\G438) in the explanation and set values.
Monitoring the scaling value
The temperature process value (PV) after the scaling processing is stored in the following buffer memory area:
• 'CH1 Process value (PV) scaling value' (Un\G412)
A scaling value is calculated as follows:
'CH1 Process value (PV) scaling value' (Un\G412)
• PX: 'CH1 Temperature process value (PV)' (Un\G402)
• PMax: The maximum value of "Input range setting" of "Control basic parameters" in "Application Setting"
• PMin: The minimum value of "Input range setting" of "Control basic parameters" in "Application Setting"
• SH: "Process value (PV) scaling upper limit value" of "Scaling setting" in "Application Setting"
• SL: "Process value (PV) scaling lower limit value" of "Scaling setting" in "Application Setting"
1 FUNCTIONS
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1.21 Moving Average Processing
(SH - SL) × (PX - PMin)
+ SL
=
PMax - PMin