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Scaling Section 2-1
2-1 Scaling
The conversion of input voltage or current in a certain range to a value in a
certain range is called scaling. For example, if the user converts input voltage
or current so to be displayed as a percentage, the converted value will be dis-
played in the range 0 through 100. The following is the scaling method.
The following graph shows the relationship between input to the Unit and the
values converted from the input. In this graph, Y1 is converted data corre-
sponding to input data X1 and Y2 is a converted data corresponding to input
data X2.
As shown in the above graph, it is possible to obtain scaled conversion data
(Y) corresponding to input data (X).
Example for Measuring Lengths Using a Sensor with an Input of 4 to
20 mA
If the output of the sensor is 4 mA when the length of the object sensed by the
sensor is 10 centimeters and the output of the sensor is 15 mA when the
length of the object is 30 centimeters, the following data should be input.
X1 = 400, X2 = 1500, Y1 = 1000, Y2 = 3000
If the input from the sensor is 10 mA, a value corresponding to the input will
be 2091 (i.e., 20.91 centimeters) in this case.
X1 can be larger or smaller than X2. Therefore, Y1 can be larger or smaller
than Y2.
Scaled conversion data
Input
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