To be honest, Im not quite sure what alot of the VI is supposed to be doing.....
Firstly try not to use while loops in side while loops. Think mof building a VI like this:
1.Setup leht hand side of a while loop (this includes initialisation, referencing of devices ect)
2.Processing inside the while loop. (this is your reading/writing of a signal, and then acting upon it. wether from a device or simulated.)
3. Closing down references and clsoing the program.
Follow this paradim, and you can't go too far wrong....... well you can but people should be able to debug your code a little easier!
Have a look at the example I have built. Try and build in your functionality using this paradim with the functionality that you need. Im not quite sure what it is you need, so if you want help defining or programmin that post back.
Rich
