Hi, I think, try giving -1 to Time limit parameter in AI read Vi or give the maximum time limit not to occur the time out operation.
See the example program at below mentioned path in your computer: C:\Program Files\National Instruments\LabVIEW 7.0\examples\DAQ\anlogin\anlogin.llb\Cont Acq&Graph (buffered) Hard A-Trig.vi. If u r not able to find, open LV->goto Find examples-> Hardware Input and Output -> Traditional DAQ -> Analog Input -> General -> Cont Acq & Graph (Buffered) Hard A-Trig.vi. Hope this helps. Your feedbacks are welcome. Best Regards, Nirmal Sharma