method to continuosly write a DBL value on DAQ?

[robertorodio]

I am trying to build a VI capable of writing continuosly on an output channel of my DAQ.
What I want to write, sample by sample, is a DBL value I generate inside a while loop (which is refreshed continuosly).

I use Labview 7.1.

Does somebody know how to do it or how to adapt any example?

Thank you,
Roberto Rodio

[pincpanter]

Generally with Help->Find Examples you can find an example about your specific hardware. Also, you can search about Analog Output.
Given the example, is often immediate to copy the code into your own vi and get it it work.

[daveTW]

The best example for your problem is probably "Gen Voltage Update.vi", if the DAQmx Write VI is sorrounded by a while loop, this should solve your problem.
greets, Dave

[robertorodio]

Thanks Dave, Thanks Paolo.

What I really need to solve now is the limit of the execution time of the while loop (which is too long).


Best regards,
Roberto

[pincpanter]

I don't know what example you found and how you are using it, but beware that the Create Channel and the Clear Task vi's should be located outside the write loop.

[Filippo_Persia]

Dear Roberto,

If you would like to continously generate different waveforms you should give a look to the example.
Harwdare Input & Output>>DAQmx>>Analog Generation>>Voltage>>Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi

As long as you provide enough samples for each iteration of the loop you should be able to get around the software timing limitation.

Best Regards