digital output 1 sec ON - 9 sec OFF

[sky_11]

Hello Friends,

I am new to LabView.

And I am working on an project where I have to control 6 relay via data acquision digital output lines.(USB-6353)

Each relay will be ON for 1 sec and OFF for 9 sec. But they all should be out of phase. So only 1 relay is ON at a time.

Can someone help me with doing this in Labview. 

Thank you.

[GerdW]

Hi sky,

you just need to output that array using DAQmx functions:

[sky_11]

Hi GerdW,

Thank you for your reply.

But for now I was busy with the this VI. The outputs a digital pulse 1sec on and 9 sec off. I copied it once to use 2 channels and was thinknig to delay it by 1 sec inside while loop.

But I just want the output on both the digital channel with just one button click, hopefully you can help me with it.

Thanks again.

[GerdW]

Hi sky,

could you please downconvert your VI to LV2011?

[sky_11]

Hi,

Here please find the LV2011 version.

Thanks,

Kind Regards

[GerdW]

Hi sky,

did you notice the snippet I attached yesterday? It shows how to use an array to hold the status of 6 LEDs in just one wire…

You should do the same with your VI. Handling each single DO in it's own loop is pure overkill - some might say RubeGoldberg! DAQmx can handle more than one DO per task, so give it a try…

Btw. are you sure you need your "wait loops" to iterate once per millisecond?

[sky_11]

Hi,

Thanks for your reply.

If i could start both of the digital output with one button.

then I will use the wait loop in the 2nd output to be 1000ms, so when the 1st output goes low then 2nd will go high.

and if i add a third output then i will use the wait loop to be 3000ms, so it will go high when 2nd goes low.That's what I was thinking to do.

Do you maybe have a VI of the snippet you attached? And how can I use to output it to the digital channels ?

Thank you.

Kind regards,

[GerdW]

Hi sky,

instead of hardcoding each and every delay between the channels you should think about a simple state machine approach:

Have one state for the delay and another state(s) for switching the outputs…

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Do you maybe have a VI of the snippet you attached?

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Just copy the snippet to your harddisc, then drag&drop it into your block diagram. That's how snippets work…

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And how can I use to output it to the digital channels ?

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You just output the "LED" array with DAQmxWrite…

[sky_11]

Hi,

Any example VI, to understand it better ?

Thank you,

Kind Regards,

[GerdW]

Hi sky,

open the example finder and look for example VIs that demonstrate the output of more than just one DO signal…