How to create a named task and assign physical channels to it?

[CDancer]

Looking for some help with DAQmx as I am tying myself in knots here.

In a program I wrote a few months ago I used DAQmx Create Task.vi to create a task with a name of my choosing and assign a global virtual channel to that task.

OK, now I want to do exactly the same, but on a system that does not have global virtual channels defined. Instead, I want to assign a physical channel to the task. I tried using DAQmx Create Channel.vi to create a virtual channel from the physical channel, and then call DAQmx Create Task.vi using that virtual channel name, but it won't accept it, presumably because it is not a global channel.

It seems very arbitrary that you can create a named task with a global virtual channel that you have created in MAX, but not a physical channel or virtual channel that you have created programmatically.

The reason I want to define the name of the task is that I am converting my vis to Matlab functions using Math Interface Toolkit, and I want the functions to work without the user having to pass a task name from one to the other. That's what my other program did and it worked very well.

Anyone know how to do this?

[MarkGrot]

Create Channel will create a task if you do not supply it with one.  To add a physical channel to a named task, call Create Task first with your desired name and pass the task output of it into the Create Channel.

[pdupre]

Hello,

In my opinion, what you said works for the AI, but it fails for the AO (at least on my computer) with a Pci-6251 Card

Regards

[CDancer]

Thanks guys. I tried what Mark suggested and it works fine. Don't know why I didn't try that particular arrangement.

I am doing single channel waveform output with a PCI-6221. Using Labview 8.5.