error 50103 on USB 6251

[AllanNish]

When I added the bottom most program, I began getting this error. What do I need to do to make this program work? Any help would be greatly appreciated.

Thank you!

[crossrulz]

Resource is reserved...

I can't see what you are doing with the top DAQmx task, but I'm guessing you are trying to do measurements with Device 1.  I think you just need to combine all of your Analog Input tasks into a single task (a task can have multiple channels in it).

[AllanNish]

Are there examples on how to add multiple input to the task? Do you just add multiple inputs to the 'start task' vi? 

[Dennis_Knutson]

Hundreds of answers to this common beginner error. Use the Browse option to select multiple channels. The syntax is Dev1/ai0:1 for consecutive channels or Dev1/ai0,Dev1/ai2 for non-consecutive.

[crossrulz]

Each time you use the Create DAQmx Channel on a task, that channel is added to the task.

[AllanNish]

Two questions:

1. Can one mix input types? E.g. differential (thermocouple) and single ended (simple voltage from a photomultiplier)? (I use both). How does one program to do both?

2.  Can one mix both AO and AI?

[Dennis_Knutson]

Yes, you can mix different configurations. As mentioned above, you simply use multiple Create Channel functions and pass the task from one to the next. No, you cannot have AO and AI in the same task.

[crossrulz]

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@Dennis_Knutson wrote:
No, you cannot have AO and AI in the same task.

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You should have all of your AI channels in one task.  Similarly, you should have all of your AO channels in another task.  Depending on what you are doing, you should consider doing the same for your digital inputs and digital outputs.