RSLogix500 Floating Point Differential

[mhowasso 5]

Hi All, Using a ML1400 with RSLogix500. What is the best way to show the difference between two F8 (Floating Point) values..??? I have two pressures (or whatever) and I just want to track the value difference between the two. Thanks,

[Mickey 71]

Subtract one from the other. Then take the absolute value of the difference. See PDF abs.pdf

[Michael Lloyd 85]

I may be missing something but Subtract: F8:0 - F8:1 Destination = F8:2 Or you can get more elaborate and subtract the analog Raw values from each other and feed them to a scale block. I set this one up as scaled for PID (not sure why my screenshot has a black background)

[mhowasso 5]

Subtracting one value from the other and using the ABS instruction worked wonderful. Thanks

[Mickey 71]

You're welcome.