Rockwell Automation T7420A_AF ICS Regent+Plus Analog Input Modules 60Hz Rejection and Fast Response - Manual (Page 17)

Analog Input Modules (T7420A, AF)
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often you will want to scale the analog input values to a more
convenient engineering unit number range.
Scaling Analog Inputs
The scaling function block is used to convert the raw 0 to 4095
units of the analog input to an engineering unit number. The
result of this scaling conversion is usually stored in a shared
variable register that you define in the shared variable editor.
After scaling the analog input to a register, you can use the
register tag name in your applications to work with the
process variable in engineering units.
An example of an analog scaling entry is shown in Figure 10.
For more details about configuring analog scaling function
blocks refer to Using the Analog Scaling Editor in Section 5
Working with Programs and Function Blocks in the Regent
User’s Guide.
Figure 10. Analog Scaling Example.