Function SCAN_Op times out but it's not consistent.

I have a PXI 1000B chassis connected to a SCXI 1001 via a PXI6031E MIO card. I have 6 1102c modules plugged into the SCXI chassis. Each module is connected to a BNC 2095 (where my field inputs come in)I have it setup to mux 192 channels into one A/D. I wrote a small program in LabWindows to get familiar with setting up the scan list. The function SCAN_Op times out but not consistently. I have included my code. Can you suggest anything?
Thank you.
George
Attachments:
scxi_testA.c ‏2 KB

Hello;
The best way to start the development of your application is to take a look at the NI-DAQ shipping examples at C:\Program Files\National Instruments\NI-DAQ\examples\VisualC\SCXI.
Regards
Filipe A.
Applications Engineer
National Instruments

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Function SCAN_Op times out but it's not consistent.