Error 200302 in DAQ-mx global virtual channels when reading 0Hz

Hello, I am attempting to calculate flowrate via frequency (by counting the pulses for a given time).
The frequency read seems fine when the operation is running. However, when there is no flow (only tested by reading the channel with the operation off) there is an error 200302 (Signal being measured is slower than the specified measurement time.Increase the measurement time, or use a different measurement method.).The concern is to make sure that when there is actually no flow rate while operating that the returning information is confirmed to be valid.
So far the only solution I've found is just ignoring/hiding errors. Any further help would be appreciated and if I have not been thorough enough please let me know.
Thank you for reading.

Hi JRoe,
You can change the timeout to -1 where no timeout will occur and consequently no error; however, until a sample is read the DAQmx Read will wait before progressing onto the next while loop iteration. This is another option to consider in addition to handling the error exception.
Regards,
h_baker
National Instruments
Applications Engineer
Digital Multimeter Resources

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Duplicating a CTR Global Virtual Channel in MAX does not update the CO.Pulse.Term setting

Hi,
Here is the issue description:
MAX version: 4.6.2f1
daqmx: 9.0.2
Hardware: cDAQ-9178 , NI-9474 Digital output.
For this module one has:
crt 0 out <--> PFI3
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crt 2 out <--> PFI1
ctr 3 out <--> PFI5
1. In MAX create a Global Virtual Channel as a CTR output on ctr0.
2. use the Duplicate in the menu to create a second counter output. Change its name, and change it ctr output to ctr 1 OUT.
3. In MAX, the Pulse Output Setup pane should reflect the change by showing the ouput terminal pointing to the proper PFIi
4. Export the settings to an INI file, and look at the CO.Pulse.Term settings for both CTR channels: they will both appear with the SAME PFIi !
5. Using LabVIEW Write a vi that generate pulses on these 2 channels , you will get Error -89137 saying a PFIi resource is already used. If you look at the Task property CO.Pulse.Terminal, it returns the same for both tas, which is the same error seen in the ini file.
Can someone at NI check this? Thx.
Laurent
PS: I posted this message in the LabVIEW board as I did not find one for MAX
Solved!
Go to Solution.

Hi Laurent,
I verified this behavior with DAQmx 9.1 and a simulated device. I will file this as a Corrective Action Request (CAR). Creating the channels manually works correctly and produces the correct .ini file. Sorry for any inconvenience this may cause.
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Is There a way to programmatically extract global virtual channel info from max?

I have a group of DAQmx virtual global channels setup in MAX and I would like to be able to programmatically extract the physical channel information to be included with the data file. In the past I have been able to use traditional NI-DAQ channel utility vi's to accomplish this, but they only see traditional NI-DAQ virtual channels and not DAQmx virtual channels. Is there a group of vi's for extracting DAQmx virtual channel information? I'm using Labview 7.1 with a Windows XP OS.

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I can access basic properties using the approach you described, but do you know how to get the units from the global virtual channel? Say I had a general appliance for reading in load cells, and I wanted to have the axis labels in a graph show the units of whatever load cell had been selected.

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Hello rlbrehm,
If you are using a global virtual channel then you have alredy set up the input configuration, as shown here:
So you simply need to set up timing and read, as shown here and in the attached VI:
Message Edited by Dr. Doiron on 08-06-2009 02:55 PM
With warm regards,
David D.
Attachments:
Global Virtual Channel.vi ‏9 KB
Input Config.jpg ‏176 KB
VI.jpg ‏78 KB

How can I get properties of global virtual channels using DAQmx?

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Thanks.

Try using DAQmxGetChanType(TaskHandle taskHandle, const char channel[ ], int32 *data)DAQmxGetChanType(TaskHandle taskHandle, const char channel[ ], int32 *data). This will return one of the following types:
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Error "Data packet not complete; for example, 000013" when reading from PSA

Dear all,
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Hii SCHT,
you encounter these type of errors rarely...
but in RSMO screen, check for any TRFCs struck..
also go to the JOB in Source System and analyze the JOBLOG,
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Force the request RED and repeat the IP again...
you dont need to worry about anything...simply force the request red and reload.. just let us know if the problem still persists after repeating the load...
Regards
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Duplicate physical channel with virtual channel

I accidently created more than global virtual channel with one physical channel, for example:
physical channel global virtual channel
a0                       vtc00
a0                       vtc01
a0                       vtc02
My questions are:
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physical channel global virtual channel
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Thanks you for your time, Dylan
Solved!
Go to Solution.

Thanks you Carisa for fast response, but that not the right answer I am looking for.
May be I did not make myself clear. I attached two screenshots for example: On one screenshot, you will see bri00, bri01, bri02, bri03, bri04, bri05, bri06, bri07, bri08, bri50 on the virtual channel tab, however you won't see them display under NI-DAQmx Global Virtual Channel (second screenshot). On the second screenshot, you only see bri00, bri01, bri02, bri03, bri04, the rest of bris do not display on here like they display on the virtual channel tab.
Now I can't create the new global virtual channel under NI-DAQmx Global Virtual Channel with the name bri05, bri06, bri07, bri08, because I will get the conflict name error pop up on the screen. How can I delete those bris in the virtual channel tab?
Thanks again for your time, Dylan
Attachments:
virtual-1.png ‏45 KB
virtual-2.png ‏226 KB

Use virtual channel name as input to DAQmx Write? LV8 and DAQmx

I've created a task for digital output that contains 8 named channels using the DAQmx Create Channel VI in Labview. Is it possible to use the channel name as an input to the DAQmx Write VI to reference the desired channel? I tried wiring a string with the channel name to the "task/channels in" input but I get a -200428 error that says the Value passed to the Task/Channels In control is invalid.
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Physical Channels, Virtual Channels, and Tasks in NI-DAQmx
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Error 200302 in DAQ-mx global virtual channels when reading 0Hz

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