Trad channel control won't show any virtual channels.

[BradW]

I have a LV 7.1, PXI system. I have set up virtual channels in MAX, but channel controls or constants will not show any of the virtual channels. They have basically disappeared as far as the controls are concerned. I have done this before with this same system with no problem. I right-clicked the controls and made sure I had the filtering set for the right kind of channels. How do I resolve this problem?

[KileenC]

Hi Brad,

The channel controls for virtual channels and traditional channels are different I/O controls. The virtual channel control corresponds to DAQmx and can be found under All Controls >> I/O >> DAQmx >> DAQmx Global Channel. The traditioanl channel control corresponds to Traditional DAQ and can be found under All Controls >> I/O >> Traditional DAQ Channel.

You actually do not want traditional and virtual channel names to be on the same control. They wire to different VIs and use different drivers -- hence they are located on different sub-palettes on the LabVIEW front panel.

[BradW]

Hm, I guess I wasn't clear. I have several named traditional DAQ channels in MAX. My trial program demonstrating the issue is extremely simple, consisting of the Acquire 1 Channel (I'm not at my office computer so don't remember the exact name) found in the standard analog input palette, with attached controls for the device, channel name, and result. Nothing else. In the past, the channel name control, a pull down box w/ a Browse option, would show the available named channels. On other seats of 7.1 around the lab, it still does. On this particular seat, it doesn't. It is a PXI box w/ integral controller, and assorted A/D modules, including a E-series, a DSA module, a TC module, and digital I/O. Any ideas what's up?

[KileenC]

Do you think you can take a screenshot of the difference you're seeing? Technically, the Traditional channel controls should not display any virtual channels that are configured for DAQmx. What happens when you place a DAQmx Global Channel control on the front panel? Can you see your virtual channels then? Also, make sure that you see the virtual channels in MAX. Then, also reset your driver to use DAQmx.

Thanks!