Two timed loops separate but connected

[wkamin]

Hi,

I have a simple Data Acquisition setup where I read 32 voltages, and write them to file.  I want my front panel to update the displayed voltages every 2 seconds, but only want the same values to be written to file every 5 minutes.

I've tried nesting one timed loop in another, but the displayed values update at the same time interval as the write to file (Write-to-file loop nested in main timed loop). 

I've also tried creating one timed loop for the display (2 second interval) and a separate timed loop for the write to file (5 min interval).  However, while the display updates, the write to file does not work.

I just want two timers working simultaneously, but one gets data from the other after 5 minutes.

Sorry if this is a repeat post, but I couldn't find answers elsewhere.

Thanks in advance,

Walter Kaminski

[Robst]

Hello:

You can use a single while loop an a couple instances of the Elapsed Time Express VI. You configure it to send you a boolean true when the time you specify elapses. Then configure one of them for 2 seconds and the other one for 300 (5 minutes). Use the output "Elapsed Time?" to control the selector of a case structure so that when the time elapses, the action you want executes.

I attached a small example.

Let me know if it helps.

Robst.

[wkamin]

Thanks a lot.  Got it working right away.