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CHAPTER 8 FUNCTION
8
8.8 Scaling Function
8.8 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. The programming for scale conversion can be reduced.
(1) Concept of scaling setting
The setting for scaling lower and upper limit values differs depending on whether the factory default setting or the
user range setting is used for the analog output range.
(a) When the factory default setting 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 setting 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, or user range
setting 2
• When the output range is -10 to 10V
Item Description
Dx Digital value
SH Scaling upper limit value
SL Scaling lower limit value
S
H
- S
L
12000
(D
X
- S
L
)
Digital value used for D/A conversion =
S
H
- S
L
32000
(D
X
- S
L
) - 16000
Digital value used for D/A conversion =