Acquiring data only once while generating other data continously

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
Solved!
Go to Solution.
Attachments:
ramp up.vi ‏20 KB

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…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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