Start counter out when AO rises to specific level. Error -200077 on Start Trigger (Analog Edge)

[TeraTech]

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@Kevin_Price wrote:

This is actually true for option 3 as well.  No physical wiring terminal is needed when you use the internally routed "_ao0_vs_aognd" channel for the AI task.  You still use up the AI subsystem though.

-Kevin P

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But with Option 3 the dummy AI task still take up a physical DAQ AI input pin, correct? In other words that, no physical wiring or "pin" but the AI channel would no longer be available for other purposes/tasks elsewhere in my application?

[Kevin_Price]

Correct.  In fact, since you're using a multiplexing device, any use of AI will reserve the whole AI subsystem, not just the individual channel.  There's only 1 converter and access can only be shared via multiplexing when channels are part of the same task.

So if you want to preserve the AI subsytem for other things, you should use option 1 and generate a trigger signal with either a DO line or a different Ctr output.

-Kevin P