Scaling 4000 - 20000 vs. 3277-16383

Why is this a thing? Why would you want 4mA representing 3277 engineering units, only to be scaled again for your process? Seems silly, I' sure I'm missing something important. For now, it is more of a hassle to try and wrap my head around the number changing three times before it represents your true value. Bleh

To have it make more sense to look at instantly.

4000 = 4.00mA, etc

If your scale is 0-100%, then at 90% reading that equals 18.4mA. If you see 18,400 on your intermediate scaled tag, then you instantly know 90%.

The analog to digital conversion is 14-bit resolution. The largest decimal number that can be represented in 14 bits is 16383. To put it another way, there are 2 to the power 14 combinations of 1's an 0's that can be made out of 14 bits. Those combinations represent the numbers zero (all 14 bits 0) through 16383 (all 14 bits 1).

The maximum decimal value represents the maximum analog signal, 20 mA. Zero mA is represented by a decimal value of zero. 4 mA is 20 percent of the way from zero to 20 mA, thus the decimal value corresponding to 4 mA is 20 percent of the way from zero to 16383, or 3277.