topic Re: labview run example in LabVIEW

labview run example

Melikyan — Fri, 13 Jul 2007 01:26:29 GMT

Dear Mr./Mrs. I make the program by Labview and need to put the run button the same as the top run (ctrl+r).

Is it possible to put Bulean Run parallel with the program Run? Please help me...

If have an example please atach...I use Labview 8.0.

Sincerely

Harutyun Melikyan

Re: labview run example

mikeporter — Fri, 13 Jul 2007 01:42:27 GMT

No, you can't create a button on your front panel that starts the VI running. The best you can do is set the VI properties such that it starts running as soon as the VI loads into memory.

What is it exactly that you are trying to accomplish? How do you want the user interface to work?

Mike...

Re: labview run example

altenbach — Fri, 13 Jul 2007 02:33:20 GMT

Mike is correct. In order for the code to read the boolean, the VI needs to be running already. Catch 22 😉

You can always set the VI to "run when opened" and have the code start in a wait state. Pressing the button would switch the code to a more productive state. 😉

(In 8.2, there is actually a way to start a VI from a front panel button but discussing this would exceeed the scope of this thread. Its not practical anyway. ;))

Re: labview run example

Melikyan — Fri, 13 Jul 2007 03:04:40 GMT

Dear Mike thank you for your response. I atach the vi...If impossible last way, next way is to run the program the top, then put Bulean to run the measurement....

After 1 measurement I want second measurement on same Graph Indicator and stop the program...

I mean Push Bulean go 1st progress, finish show the graph, then wait a litlle, then go next progress and show the 2nd graph and stop...

If I want push again....2 progress again...

Thanks a lot....

Harutyun Melikyan

Re: labview run example

altenbach — Fri, 13 Jul 2007 03:14:49 GMT

Just place it inside an event structure that fires when the run button is pressed.

(Of course the entire thing should go inside a while loop so you can run multiple times. Modify as needed)

Re: labview run example

Melikyan — Fri, 13 Jul 2007 05:26:40 GMT

Thank you very much....I want only 2 times to run...and stop, and push again and work again...

But I don't want that the top run(ctrl+r) stop. I want that stop only Bulean Run after 2 cycle...And push again, process again..

I used For loop N=2, but when I put Time Delay....First process go, then wait, then go second cicle, then wait and stop...

I don't want the last Time delay...I want only after 1cycle measure, wait, then go next cycle measure.

Once more time thanks a lot...

Re: labview run example

Melikyan — Fri, 13 Jul 2007 05:47:52 GMT

Dear Altenbach, I attach the vi that I want....But where put there "Time Wait" control to delay the time only after first measurement...

Re: labview run example

Melikyan — Fri, 13 Jul 2007 07:31:13 GMT

Dear Altenbach I have a question. If program run, after 1st cycle I cannot input the time delay, and then continue 2nd cycle, please recomend what way have to input time delay...

I need only 1 time delay between the first cycle and second cycle.

May be change "For Loop"...But how?

Re: labview run example

pincpanter — Fri, 13 Jul 2007 07:38:36 GMT

Put the wait node into a Case structure and run it only when the loop index is =0

Re: labview run example

Melikyan — Fri, 13 Jul 2007 08:24:43 GMT

Hello dear Paolo. Did you open my last Vi...? How can I do?

If you have a free time, please change the Vi and attach...I don't understand what you mean...

Re: labview run example

pincpanter — Fri, 13 Jul 2007 09:35:31 GMT

Sorry, I don't have LV 8 at hand just now. I'm attaching a picture to show you what I mean.
This is pretty LabVIEW basics; if I can speak frankly, it's not very good you don't understand it. I suggest you to spend some (more) time to learn LV basics (or your boss to let you do it!).

Message Edited by pincpanter on 07-13-2007 11:36 AM

Re: labview run example

altenbach — Fri, 13 Jul 2007 14:08:32 GMT

@Melikyan wrote:

Dear Altenbach I have a question. If program run, after 1st cycle I cannot input the time delay, and then continue 2nd cycle, please recomend what way have to input time delay...

I need only 1 time delay between the first cycle and second cycle.

FIrst of all, there is no "time delay" between any cycles in your code. Your FOR loop with the progress bar runs in parallel with the measurement code at each iteration of the loop. If you want the wait loop to execute either before of after the DAQ part in each iteration of the FOR loop, you need to enforce some execution order using dataflow.

As Pincpanter mentioned, just place the delay statements (e.g. your FOR loop) it inside a case structure and wire it directly to [i]. Make one case 0, and the other "default".

Re: labview run example

Melikyan — Sat, 14 Jul 2007 02:07:12 GMT

Dear Altenbach, Mikeporter and Paolo thanks a lot...Now my next step is put 2 controls (1st fixed frequency, 2nd S11)...But:

After 1cycle measure and show the graph. If given fixed frequency (1st control), the corresponding S11 bigger than 2nd control (S11) go 2nd cycle....

If given fixed frequency(1st control), the corresponding S11 lower than 2nd control (S11) wait infinite (program no stop), but after I push 1 Bulean(Need new bulean) continue 2nd cycle...

Once more time thanky you very much, your help is very very useful for me...

Sincerely

Harutyun Melikyan.

Re: labview run example

Melikyan — Sat, 14 Jul 2007 07:29:48 GMT

Dear Altenbach, please look the atached Vi. I add controls, now need only to put one bulean, if push the bulean the condition change.

Now condition like this: If Indicated S11 less than Control S11, 2-nd cycle go...If Indicated S11 bigger than Control S11, 2-nd cycle wait many time....

I want to put the Bulean, and during the process(after 1st cycle waiting...) if I push, continue the 2-nd cycle ...(same as If push the Bulean < condition change to >).

Thank you....

Re: labview run example

Melikyan — Sat, 14 Jul 2007 07:55:14 GMT

Dear Altenbach I make the Vi (atached ...MOD4)...Work right. But in this configuration I cannot push the Bulean during process.

Please let me know, how can I push the bulean during the process...

Thanks again...

Melikyan.

Re: labview run example

mikeporter — Sat, 14 Jul 2007 12:34:48 GMT

Do you mean, how can you abort the acquisition process in the middle, that may require modifying the way your subVIs work, and certainly getting rid of that single monolithic wait at the end. Is this instrument a serial device?

Mike...

Message Edited by mikeporter on 07-14-2007 08:44 AM

Re: labview run example

altenbach — Sat, 14 Jul 2007 18:25:11 GMT

OK, there are still serious flaws all around. I assume that your initial wait should happen after "Run!" is pressed, but before the DAQ and progress bar will start running. Right now this all happens in parallel, so the initial wait has no functional significance. Right? Right! 😄 You need to create an artificial data dependency to enforce execution order via dataflow.

Since we already have a while loop on the outside, we can recruit it to repeat the DAQ. No extra FOR loop necessary.

In addition to the "Run!" button, also assign a timeout to the event structure. Initially, set it to infinite (-1) so only the "Run!" button can trigger, but then set the timout to either infinite or zero, depending on if you want to repeat the event case once more without user intervention. If the case does not repeat, you simply need to press "Run!" once more for the second run. No need for secondary buttons and complicated instructions. 😉

It is much better to utilize timeouts for long waits, because they can be interrupted at any time. A long wait on the diagram will block everything else.

Right now it is setup to wait indefinitely after each second iteration ([i]=odd), but you can easily modify that too.

Also note that I removed unneeded duplicates such as your "1000000000" diagram constant that occurred 3x where once is plenty.

Just take this as a draft. I cannot test without your hardware, so there are probably bugs. 😉

Re: labview run example

Melikyan — Sun, 15 Jul 2007 11:32:56 GMT

Dear Altenbach thank you very much....You help me everytime. Thank you for your kindness.

I have no Labview 8.2.1. Can you attach the Vi for 8.0 version.

Thanks.

Melikyan!

Re: labview run example

altenbach — Sun, 15 Jul 2007 19:54:24 GMT

@Melikyan wrote:
I have no Labview 8.2.1. Can you attach the Vi for 8.0 version.

OK.

Re: labview run example

Melikyan — Mon, 16 Jul 2007 03:03:36 GMT

Dear Altenbach Thank you very much. Only i change Time delay part, because I need Time delay after progress. Another all fine. You made the best way.

Now the problem is the Register clean. After measurement or after 2 progress need to clean register or update the controls...

Because after measurement I change the control and Push the run again, but don't work correct, I think register not cleaned after progress.

If after every measurement push Stop change controls and run again, the program work correct, but if don't stop work no correct.

What I can do?