If thing 1 is true return true. If thing 2 is true return false. (not quite like select function)

[FIT Engineering]

I have two inputs within my LV program.  I need to output true (or value for true) if input 1 is true but output false (or value for false) if input 2 is true.  The select function allows different outputs but for only 1 input. 

[bmihura]

What if they are both true? Or both false? You need a simple logic table like this:

a b result
0 0 ?
0 1 0
1 0 1
1 1 ?

Fill in the question marks, then the logic will be obvious if you speak it using the word "and" or "or".

[Kenny_K]

It should be fairly eeasy to come up with a boolean structure fo this.  For example, you have if input 1 as a true and input 2 as a true, what does it output???

Normally you can make a table to figure out what structure you could use.  1 = true, 0 = false

Input 1   Input 2   Output
0            0            0
0            1            0  
1            0            1
1            1             0 (I am assuming)

That means if you write it out out need (input 1) * (input 2)' or an And terminal with input 1 wired to a terminal and input 2 wired to a not and then to the other and terminal (see picture)

[tbob]

Here is another way to do it:

Message Edited by tbob on 03-22-2007 10:01 AM

[GerdW]

Hi all,

it's even more simple to use compound arithmetic for this term (used constants for simplicity):

Message Edited by GerdW on 03-22-2007 06:05 PM