I have spent two weeks frustrated, trying to create a program from a VI example from some third party hardware, A velleman usb k8055 board. The hardware has various inputs and outputs. The digital I/O of the example program is translated as boolean which i seem totally unable to use in loops. From what I have searched the programatically generated boolean seems to be of wrong mechanical function to actually be used in labview loops. I have a template VI that was supplied with the hardware and everytime I try and place the boolean output (local variable from an indicator, tunnel wire) it either seems to latch the original output indicator or stop the original code from funtioning and focus' only on the loop. If I replace the programatically created boolean with a standard boolean switch everything functions correctly. I have encounted this many times and sometimes find ways outside of a loop to solve the problem. If possible I would like to know how to use these generated boolean outputs in loops. I have only used labview for two weeks and I have watched both labview basic tutorials and searched all possible combination of my problem on google leading me frequently to these forums, some of which have helped with my problem so far. I seem to spend a lot of time copying and pasting code, splicing wires in a hope to find a solution to my problem. There is something called Property Node Value Signalling which I am told might help but I have tried and dont know how it works. I can give info on the overall project if no one knows the problem I am encountering. I am really a hardware man and not a programmer. Any advice will be helpful

LabVIEW

Programatically generated boolean in loops

A state machine will solve your problem. LabVIEW has examples of state machines that ship with it. Here is a contrived example but it should illustrate the basics.

Mark Yedinak
Certified LabVIEW Architect
LabVIEW Champion

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