acquiring data only once while generating other data continously

[r_te]

Hello,

I am using Labview 2009 on windows 7 PC and I am using NI USB6009 for my application.

In my vi I want to generate ramp voltage continously which I can in my current vi. But while doing this I will be connecting relay contact to other digital input. I want to store the generated ramp voltage at the instance when the relay closes its contact which I will know as it is connected to the digital input. The contact is going to remain closed for a while but the instance at which is closes is of value to me. I tried various things using case structures or even parallel while loops. but unfortunately I am not so much acquainted with event structures so I couldn't achieve what I wanted. Please help me out.

Thanks

Rohan

[GerdW · Accepted solution]

Hi Rohan,

pseudo-code:

IF RisingEdge(digital input) THEN
  store current AO value in shift register
ENDIF

 You need the PtByPt_BooleanCrossing function, a shift register and a select node…

[r_te]

how do I get the rising edge is what I don't know

[GerdW]

Hi Rohan,

as I said before: you need to use PtByPt_BooleanCrossing…

[r_te]

thanks a lot GerdW 🙂