Help creating the logic for a program

[Elektrische]

Hi, I have 8 selection available switches each of them reads an analog signal in which I use as a voltage reference so if I only select 3 of the 8, one of those 3 must be selected automatically as a voltage reference but only if is available, if one of those three is turned off the program should now change the voltage reference from one of the 2. 

I hope you can help me creating the logic for this.

Greetings

[RavensFan]

I can't follow what you are saying in paragraph form.  Particularly "must be selected automatically as a voltage reference but only if is available"

Since you understand what you want to do, I think you have the best chance of figuring out the logic.  Break it down into steps.  Create a flowchart of all the steps and decision processes.

[cbutcher]

If you build an array of boolean values, you can just search through for the first True value and use that one.

To update when one becomes unavailable, use a small subVI for this selection process, and perhaps place it inside a Value Change Event Structure for the boolean switches.

A typedef'd cluster of booleans might be easier to use, if you know you will always have 8 (or at least, if you know you have a small constant number) - otherwise, stick to the array.

Perhaps something like this:

[Elektrische]

Thank you that helped !!