Scaling

When you scale a channel, you select two points that represent signal units, that is, a Low Signal and a High Signal. You also select two points that represent engineering units, that is, Low Engineering and High Engineering.
The Low Signal point equates to the Low Engineering point and the High Signal point matches the High Engineering point.
IMPORTANT: In choosing two points for the low and high value of your application, you do not limit the range of the module. The module range remains constant regardless of how you scale it.
Scaling lets you configure the module to return data to the controller in engineering units.
For example, if you use the 5034-IF4IH module in Current mode with an input range of 4…20 mA, to receive values in Percent of Full Scale, configure the module as follows:
  • Low Signal = 4 mA
  • High Signal = 20 mA
  • Low Engineering = 0%
  • High Engineering = 100%
The returned value is indicated in the
I.Chxx.Data
 tag.
The following table shows values that can appear when using Percent of Full Scale.
Current Values Represented in Engineering Units
Current (mA)
Engineering Units Value (%) in
I.Chxx.Data
 tag
0.0
-25.00
3.0
-6.00
4.0
0.0
12.0
50.0
20.0
100.0
23.0
118.75
Provide Feedback
Have questions or feedback about this documentation? Please submit your feedback here.
Normal