Trigger DAQ via main Vi

Hello world

Currently, I'm trying to start and stop data via a main vi acquisition.

I did it according to: http://digital.ni.com/public.nsf/allkb/A882E27D1D7A949386256E0D0066B91A

If I share the reference control and use a simple button in my Subvi, it works as I want.

But if I use the mainVi it does not work. Can anyone tell my why it doesn't work?

Since I'm pretty new to LabView, I have no idea.

Thank you very much!

These two screws are attached.

Edit: since the acquisition of data gets currently build in a rack, I work with simulated signals.

You build a State Machine, but do so in a way too complicated.  A particularly simple way, especially for someone of haven't experienced not so much in LabVIEW, is building a State Machine queue using the design of producer/consumer model to manage the controls on the front panel (such as Start and Stop).

Open LabVIEW.  Go to the file menu, click New... (the one with three dots) and open it from the model, frameworks, Design Patterns, producer/consumer Design Pattern (events).  This will show you how, when the user runs a push Start, you can put the State to acquire on the queue.

The consumer on the bottom loop becomes a State Machine in queue.  He expected to dequeue a State, and when that happens, he uses a Case statement to run code for this State (as you do in your state of acquisition).

Now you have to think that the States, you need for your computer state.  Particularly for an Acquisition task, you should have (at least) Initialize (material), to acquire (a data point), to possibly treat (data point) and to stop (and clean up after yourself).  You will probably have at least two controls, Start (start absorbing) and stop (finishing and cleaning).

The task of producer concerns only market buttons / stop, which could put acquire it and the States of Stop on the queue of handling state machine.  Until any button is pushed, this loop does no time to run, so you can ignore the case.

The loop of consumer does all the work.  How to start?  Specifically, how do we get to "Boot" on the line of the State?  Simple - enqueue just before entering the loop of consumer (i.e. outside the while loop).  This will be first on the queue, and you initialize and wait for someone do start or stop.

So, how do we not take the second point?  [We take the first when Start is pressed].  Again, simple - when you want to take the second point?  You want to wait between points?  Do very well, a State of waiting and in the State of the consumer Acquire, queue Wait.  The wait state has your delay and this, in turn, place 'acquire '.  You want to treat each point?  All the other points?  Something else?  Very well, to understand where you want to do this and queue the status of the process (remember to put what comes after the process, maybe wait).

Your code uses dynamic events, which is a topic "more advanced" than the simple Structure of the event, which should be all that you need.  Note that if you do not need to "export" some treatment to a Subvi, it almost always makes the most sense to keep the code involving the Panel front (as the event loop) in the hand of VI and pass a reference to queue (if you use a state machine waiting in your Subvi) of the Subvi.

Hope it will be useful to you.

Bob Schor

PS - you note that you have knowledge of VBA, Java and other languages.  Would you consider doing a big project with one of these languages if you "first had in July, with the project in September?  I'm sure you already know, competence in learning any language takes time and benefits has a lot of tips current (meaning "mentor").  We will try to be your Mentor disappeared.

Tags: NI Software

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