Error -10845 on PCI E series DAQ

[yahugh]

I'm using a 6041E board with LabVIEW 6.1. I have an application which was working fine for months. Now, for no apparent reason, I'm getting "Error -10845 occurred at AI SingleScan". Nothing has changed in my application. Same number of channels, same scan rate. Interestingly, I tried lowering the scan rate from 10K samples/second to 100 samples/second and the error went away. It comes back for anything over 500 samples/second. What in the world could have happened?

[Filipe A.]

Hello;

That error shows when your application is not retrieving data fast enough from the on board FIFO memory, so the FIFO is overflowing.

Since windows manages all applications handled by the computer CPU, in case you have other tasks running at the same time your Data Acquisition tasks is running, the CPU might be taken by other processes to handle other tasks, while the on board FIFO is being filled. That might overflow the FIFO in case the CPU is not retrieving data fast enough.

The best way to go about that is to run one of the Labview shipping examples to see if the same phenomena shows. I suggest you to run the one named "Continuous Acquisition and Chart (buffered).vi".

Hope this helps.
Filipe A.
Applications Engineer
National Instruments