NI-DAQmx virtual channel

[ipauli]

Hello,  I have set up 50 virtual channels and all are receiving data from the instruments as I can tell by the changing values when I hit run.  I have an OPC client that is showing this channels.  Most of the data is send and mimics what is in NI-MAX.  But several of the channels are sending a constant steady 0.000000.  Does anyone know what could be incorrect?  I attached a couple screen shots to show what I mean.

Thanks,

Paul

[adena.l]

Hi ipauli,

What hardware are you using for these global virtual channels? You see the value changing in NI MAX when you hit run, but on the OPC client you see a constant 0.0000 for some of these channels? Is the problem isolated to specific hardware, or do some channels on a single piece of hardware work while others do not? I am trying to isolate this problem to either the OPC server or the hardware. 

[ipauli]

Hi Adena,

Some strange occurred.  When I posted there were about 15 tags that were not reporting.  Today there were 6 that did not display.  I do not have any idea why  the  others started transmitting data but I do not care at this point.  If they stop relaying data, I will certainly relay the problem.  

For the other channels, actually 2 of them, I am embarrassed to say, I had the same input sources as others.  I corrected them and all is well. 

Why some were not transmitting then started is absolutely strange.  If I find a reason I will tell but all is functioning now.

Thank you for replying.

i appreciate it,

Paul