Mitsubishi Electric MELSEC iQ-R Series User Manual page 71

■Calculation example
Ex.
A calculation example of the scaling of the temperature process value (PV) into percentage
• "Input range setting" of "Control basic parameters" in "Application Setting": 38 (Temperature measuring range: -200.0 to
400.0)
• "Process value (PV) scaling upper limit value" of "Scaling setting" in "Application Setting": 100
• "Process value (PV) scaling lower limit value" of "Scaling setting" in "Application Setting": 0
'CH1 Process value (PV) scaling value' (Un\G412)
■Setting method
1.
Set "Enable" or "Disable" for "Process value (PV) scaling function enable/disable setting."
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Scaling setting]  [Process value (PV)
scaling function enable/disable setting]
2.
Set "Process value (PV) scaling upper limit value."
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Scaling setting]  [Process value (PV)
scaling upper limit value]
3.
Set "Process value (PV) scaling lower limit value."
[Navigation window]  [Parameter]  Target module  [Application Setting]  [Scaling setting]  [Process value (PV)
scaling lower limit value]
• Even though the lower limit value has been set to be equal to or larger than the upper limit value in the
above settings, an error does not occur. Scaling is executed according to the formula. ( Page 68
Monitoring the scaling value)
• When a value out of the temperature measuring range has been measured, the value set as the upper limit
value or lower limit value is stored in 'CH1 Process value (PV) scaling value' (Un\G412).
(100 - 0) × (3600 - (-2000))
=
4000 - (-2000)
= 93.333
(All decimal places are rounded off to an integer.)
= 93
+ 0
1.22 Scaling Function
1
1 FUNCTIONS
69