Omron CQM1H - 08-2005, Operation Manual

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2-1 Scaling
The conversion of input voltage or current in a certain range to a value in a cer-
tain 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 displayed
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 val-
ues converted from the input. In this graph, Y1 is converted data corresponding
to input data X1 and Y2 is a converted data corresponding to input data X2.
Scaled conversion data
Input
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.
Scaling
Section 2-1