How to initiate a trigger based on threshold value from DAQ

Hello,
         can anyone please tell me how to start a counter/trigger based upon a threshold value/??i would like to measure the amount of time
the particular input value is greater than the threshold value...
I tried out the simple VI attached, but the start time and the end time show the same values... can anyone please suggest/???
Now on LabVIEW 10.0 on Win7
Attachments:
trigger.vi ‏103 KB

sorry, attached the wrong VI,
here you go,,, this should work....
Now on LabVIEW 10.0 on Win7
Attachments:
Trigger Counter.vi ‏143 KB

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