Scaling Function - Mitsubishi Electric NZ2GF2BN-60DA4 User Manual

8.9

Scaling Function

The D/A converter module scale-converts the digital value to the set range of the scaling upper limit value and scaling
lower limit value. This function reduces the time and effort to create a program of the scale conversion.
(1) How to interpret the scaling setting
The setting for scaling lower and upper limit values differs depending on whether the factory default range or the
user range is used for the analog output range.
(a) When the factory default range is used for the analog output range
• Set a value corresponding to the upper limit value of the analog output value in the range setting for the
scaling upper limit value.
• Set a value corresponding to the lower limit value of the analog output value in the range setting for the
scaling lower limit value.
(b) When the user range is used for the analog output range
• Set a value corresponding to the gain value for the scaling upper limit value.
• Set a value corresponding to the offset value for the scaling lower limit value.
(2) Calculation of the scaling value
Scale conversion is performed on the digital values using the following formula:
(Values after the decimal point are rounded down during scale conversion.)
• When the output range is 4 to 20mA, 0 to 20mA, 1 to 5V, or 0 to 5V, user range setting 1 (-10 to 10V), or user
range setting 2 (0 to 20mA)
• When the output range is -10 to 10V
Digital value used for D/A conversion =
D
x
S
H
S
L
Digital value used for D/A conversion =
Item
12000
× (D - S )
X L
S - S
H L
32000
× (D - S ) - 16000
X L
S - S
H L
Description
Digital value
Scaling upper limit value
Scaling lower limit value
CHAPTER 8 FUNCTIONS
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