Synchronize the clocks of PCI I / AO with multiple AI in parallel

I want to synchronize my HAVE and AO to run on the same clock and have my AO beginning with a relaxation from the beginning of IT.  All works beautifully except when I have another process running in parallel.  I use the cDAQ chassis 9178 and I have a low resolution HERE (9201) that runs in the context of monitoring for alarm conditions.  I want to run in parallel to my DAQ vi.

In the vi DAQ begins AI (9222) and triggers the AO (9263), the AO clock is referenced to Dev1/AI/SampleClock and start trigger is referenced to/Dev1/I/StartTrigger

The problem seems to be that if the 9201 collects data HAVE then my AO is actually running at that frequency of clock instead of the 9222 (since the 9201 is always launched in the background, the OD has seen this first)

How can I tell the AO (9263) to run with the AI 9222 clock and trigger rather than the AI 9201?  I think that I do not understand how the chassis works with modules...

Gracias.

Hello Telleurium,

The quick answer is call specifically on the timing engine and relaxation of timing engine. This will ensure that the 9263 and the 9222 are synchronized. Please take a look at the example below what I call specifically on the timing engineof teo.

A more detailed explanaiton of what happens is that the 9201 seizing first the timing of AI engine (which means that it is now associated with the AI and AI trigger sample clock) so you see the 9263 is synchronized with the 9201.

Best regards

Izzy O.

Technical sales engineer

National Instruments

www.NI.com/support

P.S. on further notice, that it would probably be easier to point the 9201 on a different timing engine.

Tags: NI Hardware

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