Studio 5000: Find closest number in Array

[janner_10]

Hello!

I am in the process of converting a Horner program into Studio 5000 for a customers gasifier.

The Oxygen sensors are +/- 1000 mV.

The find out the % of O2 in the vessel, I need to use a look up table I have build into a 2D Array.

Now I wish to search this array to find a value that is the closest to my reading.

Anyone have any ideas how to go about this?

TIA

 

[jkerekes]

FGEN function in function block might be what you're looking for.

 

[ASF]

You could get a bit creative with an FSC instruction. Otherwise, there's always brute force, it wouldn't be overly complex in this case.

I haven't really used FB to be able to vouch for the FGEN instruction, but I'm about to go and look at what it does...

 

[janner_10]

The FGEN seems to work pretty well so far, so thanks for the suggestion.

Trouble is I now have to work out the different O2% Readings based on the vessel temp!

Attached is the look up table for those interested.