Counter/Timer

[walletok]

I'm working on  a PXI-6115 DAQ card and want using analog signal to trigger it's counter generate frequency pulse. The user manual says the analog trigger is supported, but  I can't use a analog signal to trigger it start work, in the test I use counter 0 to generate pulse and use PFI 0 as analog trigger signal input port, can anyone tell me what the matter is? My test VI. & error message is showing in attachment .

Best regards

[snowpunter · Accepted solution]

If you read the error you can see that digital triggers are the only available trigger when using Counter Output.

You can get around this by setting up a dummy Analog Input task that will fire an internal digital trigger when it sees the appropriate analog trigger.

See this thread for more details:

http://forums.ni.com/t5/LabVIEW/DAQmx-Start-Trigger-Analog-Edge-vi-Keeps-Returning-Error-200077/m-p/...

[walletok]

Hi, snowpunter

Thanks for your response.

AnologComparisonEvent is a evil event, Even if 6115 analoge channels without retrigger function, it can offer a internal trigger pulse  everytime  the analoge trigger signal fit pre-set trigger state. Now I use AnalogComparisonEvent as CO clock source and CO task is working properly .