Scaling Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Scaling Function

This function performs the scale conversion on digital output values. The values are converted within a specified range
between a scaling upper limit value and scaling lower limit value.
The converted values are stored in "digital operation value".
Concept of scaling setting
Ex.
When the input range is set to -10 to +10V:
For the scaling lower limit value, set a value corresponding to the lower limit value of the input range (-8000).
For the scaling upper limit value, set a value corresponding to the upper limit value of the input range (+8000).
Calculating the scaling value
The scale conversion is based on the following formula. (In scale conversion, values are rounded to the nearest whole
number.)
■Current (0 to 20 mA, 4 to 20 mA), voltage (0 to 10 V, 0 to 5 V, 1 to 5 V)
Calculation formula
D × (S -S
X H
D =
Y
D
Max
■Current (-20 to +20 mA), voltage (-10 to +10 V)
Calculation formula
D × (S H - S )
X L
D =
Y
D - D
Max Min
Setting procedure
1.
Set "Scaling enable/disable setting" to "Enable".
Navigation window  [Parameter]  [Module Information]  Module model name  [Module Parameter]  "Application
Settings"  "Scaling Setting"
2.
Set values for "Scaling upper limit value" and "Scaling lower limit value".
Item
Scaling upper limit value
Scaling lower limit value
• Even when the scaling upper limit value and the scaling lower limit value are set so that the change is
greater than the resolution, the max. resolution will not increase.
• If the relation between the values is scaling lower limit value > scaling upper limit value, the scale
conversion can be performed according to a negative slope.
• Set the scaling with the condition "Scaling upper limit value  Scaling lower limit value".
2 FX5-4AD-ADP
30
2.3 Functions
)
L
+ S
L
(S + S )
H L
+
2
Symbol
D : Digital output value
X
D : Scaling value (Digital operation value)
Y
D : Maximum digital output value of the input range in use
Max
S : Scaling upper limit value
H
S : Scaling lower limit value
L
Symbol
D : Digital output value
X
D : Scaling value (Digital operation value)
Y
D : Maximum digital output value of the input range in use
Max
D : Minimum digital output value of the input range in use
Min
S : Scaling upper limit value
H
S : Scaling lower limit value
L
Setting range
-32768 to +32767
-32768 to +32767