Digital Inputs do not record over long time periods

I am running Signals Express 2009 with a USB-6009.  I have a project that needs to record the states of 8 digital inputs over a 24 hour period.  The inputs typically do not change state for long periods of time.  When I run the project it does record and gather data if I stop it "soon"(I have gone as long as 30 min.)  When I leave it running overnight it does not appear to record anything.

If you have not already, you should try turning off display updates in the "Operate »Update Signal Views While Running" menu item.  Set this to Update None.  Also, turn off "Prepare log data for viewing" under the Logging part in the Tools » Options dialog.  
When I ran your project overnight, it ran out of memory.  The first error it threw was "Not enough memory to complete this operation."  The problem was that SignalExpress saved a great deal of data in memory for easy displaying while it's running, but this grows too big when it runs overnight.  The second error was as follows:
Logging Stopped:
Logging was stopped because an error occurred with a Step in the Project. 
If this error is because of a device buffer overflow, you can improve performance by turning off display updates using the "Operate »Update Signal Views While Running" menu item.
You can also change the way signals are logged by changing the Logging Options in the Tools»Options dialog.  
Turning off  the "Prepare log data for viewing" will greatly improve performance. 
Mark E.
National Instruments
Schedule a Free 1-Hour online LabVIEW Tutorial with an NI Applications Engineer

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