Rockwell Automation 2711 PANELBUILDER SOFTWARE USER MANUAL - Manual (Page 298)

The Objects
Chapter 10
10-33
You have the choice of displaying the value with a decimal point, or
rounding off the scaled value to the nearest whole number. For scaling,
PanelView uses the formula:
Displayed value = Mx + b
M is the scaling factor
x is the value in the associated PLC address. The PLC address must
contain data in the BCD, binary or signed integer data format
b is the offset
Example: Scaling Formula
The range of values in the assigned PLC Address is from 0 to 4095. This
range was determined by the specific type of analog input module being
used. The actual range in engineering units is 0 to 700 gallons per minute.
This range was determined by the measuring device providing the signal to
the analog input module (for example, the flow meter).
Based on the above information, you would assign the following:
M = 700/4095 = 0.171
b = 0
If the PLC value was 3,000, the display would be:
Displayed Value = Mx + b
= (0.171 * 3000) + 0
= 512.821 (513 rounded)
When fewer digits are displayed, the left portion of the display must be
filled with either blank spaces or zeroes. You can choose either spaces or
zeroes by choosing Fill Left With.
If the value cannot be displayed within the number of digits specified for
the object, a string of asterisks (*) is displayed instead.