Formula Node Data Transfer

[MeCoOp]

I wrote a program that uses several input variables in a series of formula nodes. For some reason I continuously get 0 once the formula node has executed, I'm not a programmer by trade and can't figure out why, any suggestions?? Thanks in Advance. Oh, I'm using LabView 6.1 if that helps.

[altenbach]

You need to define the outputs in the formula nodes. (Unlike in the expression nodes, where there is only one input and output).

For example, in the topmost formula node, the formula should be "Pp = (Pe-Pb)*((Td-Tw)/1500);".

And so on... See if this helps!

[MeCoOp]

Its always the smallest things...lol...thank for your help!!

[altenbach]

Also remember that you could dramatically simplify your code by combining all your formula nodes into one (see picture).



You might also want to precalculate "Td+273.15", it occurs 4x in the formula node. There is definitely something wrong, either with the default values of your VI or with the formula. Air densities of 100000kg/m^3 seem a bit unrealistic. Are the units correct? ;).

Message Edited by altenbach on 06-23-2005 07:22 AM

[MeCoOp]

Ok, thanks for the organization tip, it makes things a lot easier to follow. You were right about those equations I went back and re-evaluated my approach. Thanks for all your help.