DAQmx- create channel- no channels found

Hello,
i am new to labview. So maybe my question is easy...
I want to generate a signal. That's why i am using the DAQmx-create channel.vi . I i created a control to chose the channel, where the signal is generated. But no channels are found.
i am using PXI 5412 and my device is visible in MAX. So i don't know what is the problem. Can anyone help me?
Thanks,
Ratta
Solved!
Go to Solution.

The 5412 is an Arbitrary Waveform Generator. It does not use DAQmx. It uses NI-FGEN.
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Error -200431, DAQmx Create Channel (AI-Voltage-Custom with Excitation).vi

Where is "DAQmx Create Channel (AI-Voltage-Custom with Excitation).vi" gone?
I tried to use this VI for force measurement with a NI PXI-4472. It responds with Error -200431, ... You Have Requested: More:Voltage:Custom with Excitation, You Can Select: Voltage, Sound Pressure:Microphone, ...
It seems for me to be an internal error of this VI, LabView Version is 8.6.1
Solved!
Go to Solution.

Hi T.Knox,
error -200431 is a measurement type error:
"Error -200431 occurred at an unidentified location. Possible reason(s):
Measurements: Selected physical channel does not support the measurement type required by the virtual channel you are
creating. Create a channel of a measurement type that is supported by the physical channel, or select a physical channel
that supports the measurement type."
The PXI-4472 (8 Inputs, 24-Bit Dynamic Signal Acquisition module for sound and vibration measurement) is the wrong device
for force measurement.
I also searched our website and found some helpful links:
http://zone.ni.com/devzone/cda/tut/p/id/3602#toc2
The PXI-4472 (http://sine.ni.com/nips/cds/view/p/lang/en/nid/5031) isn't listed as supported device for force measurement
there!
I hope this information helps you!
Regards
Suse
Certified LabVIEW Developer (CLD)

Error -200220 occurred at DAQmx Create Channel (CO-Pulse Generation-Time).vi:1

Hello,
Just a couple of days ago I was given a task to complete. To transfer a Labview program from a desktop computer to laptop.
The program itself uses a marlin camera to count the number of seeds.
The transfer was fine I installed Labview 8.2, installed the DAQmx drivers and labview vision.
I then transffered the program files over and ran the program on the laptop in labview and found an ERROR: Error -200220 occurred at DAQmx Create Channel (CO-Pulse Generation-Time).vi:1
I remember that the desktop had a kind of board attached to it: some NI board dont know the model etc.
can this be a problem? I have ensured that the problem is not the camera by checking it in MAX and it works fine.
When i do step by step debugging the problem comes to a VI that uses a palette called DAQmx trigger - data acquisition palette.
please see the attached picture!!
Is this VI the problem then and is this palette the main problem that is not enabling this program to work??
thankyou
p.s. Will it be necessary to use the NI board then? if so i dont think it will work on the laptop then as you will need to install the daq card
which can only be done on a desktop i think!!

Hello Rob W,
Yes I only use a Firewire to connect the camera.
And also i am sure that the device shows up in MAX under NI-DAQmx devices and not under Traditional DAQ. and it works under max.
I am sure the problem is as shown in the image. because i have not connected to the NI board on the laptop and the program is designed to work with the board.
but i have also tried removing the parts in the program that use the board but because of the complexity of the program i.e. wires i had some other problems i think
must be the wiring etc
thankyou

DAQmx Create Virtual Channel AI Temp TC Deg F Bug

Found a bug in DAQmx Create Virtual Channel AI Temp TC Deg F when using a cDaq-9174 with a NI 9213 Analog Inpout module. When I change from Deg C to Deg F I do not get the correct temperature. In Deg C I read ambient temp of 21.84 Deg C Vs. when I select Deg F I read 18.33 Deg F. When I use the DaqMX Assistant the asssitant returns the correct values. Is this a know bug on the 9213 driver? What is the fix?
Solved!
Go to Solution.
Attachments:
Read one AI Temp Channel in C or F.vi ‏13 KB

Thank You - Found it here too

Why do we get so many vi's when using "DAQmx Create Virtual Channel.vi"?

Hi there,
Could anyone explain me why we get hundreds of sub-vi's when I use the
vi "DAQmx Create Virtual Channel"? This can easily be seen by exploring
the hierarchy of Labview examples such as "Acq&Graph Voltage - Ext
Clk.vi"???
This multitude of vi's considerably slows down my computer, especially at loading. Is there any way to get rid off that???
Thanks in advance for you help!
Jonas

Hi,
the easier you have to program, more subVI´s needed for your kind of application. Because the VI´s from DAQmx are polymorph, so many SubVI´s are included in the VI´s. In traditional DAQ you have several palettes for each kind of measuement method. Analog In, Analog Out, Digital, Counter, ...! In DAQmx you have one VI and that can all.
But, the performance of you application at runtime is not affected. Of course it takes some time to load, but just at development environment not as an application.
Figure 3. Polymorphic VIs simplify the NI-DAQmx API.
Link to Document:
http://zone.ni.com/devzone/conceptd.nsf/webmain/EE47B125BB9E053686256FBC0014C384
Hope this helps.
Alex
NI Switzerland

Error Code -50150 from DAQmx Create Channel (AI-Voltage-Basic).vi

I have an executable, built from Labview 7.1 VI's. All it is doing is reading 6 voltages back from a 6008 USB-DAQ, and reporting the results back. Occasionally, it is throwing an Error -50150 from DAQmx Create Channel (AI-Voltage-Basic).vi. The full error message is:
Error Code: -50150
DAQmx Create Channel (AI-Voltage-Basic).vi<append>
<B>Task Name: </B>_unnamedTask<0>
Can anyone shed some light on this problem?
Cheers.

Hi fellas,
I have a really similar problem to the one Neilelph had, but I can´t see how to solve it from your answers. I attached a picture of my main .VI.
It´s basically a photodiode measurment system working as follows:
1. First the moving stages for the system get ready (X-Y moving stages for the Photodiode and Z stage for the Laser). That´s the CONFIG subVI in the left.
2. Then there is a For Loop, that repeats N times depending on the Initial Z, final Z and step values. So in this .VI the laser moving stage is the only one changing.
3. In each loop, the stages go to the X,Y,Z(t) posiition (MOV subVI), wait for the movement (WAIT subVI) and read the position. After that, the DAQmx acquistion part starts. I just sample the output DC voltage coming from the Photodiode (Dev1/ao1), 1000 samples in 1 second, and then I make an average of all of them with the Basic DC/rms block. So at the end I have 1 position of Z and one DC value. And it worked perfectly. At least for small number of iterations I have no problems.
The problem comes with small steps and a great number of iterations. For example last night I ran a measurement. 10000 iterations, the whole range of Z, and today i checked it. It worked fine until 5000 give or take, the half of the range. From that point, the DC ouput recorded in the .lvm file is just 0.00000. It´s the second time it happens, so I´m wondering what´s wrong because I´m affraid to make more long measurments and obtain the same results.
The error message I obtained is the same than in the thread title: -50150 DAQmx Create Channel (AI-Voltage-Basic).vi:6<append> <B>Task Name: </B>_unnamedTask<53BC>
Maybe it would be useful to mention that, sometimes, there is no error and I have some DC Output Voltage value, for random Z potitions, but since the first error message, that barely happens. The output is almost always 0.
Sorry for my writting skills in English. I hope you can understand my situation.
Thank you in advance.
Kind regards,
frilance.
Attachments:
Diagram.JPG ‏83 KB

Using two daqmx create channel to acquire signals in random

Hi
I am trying to acquire signals from PXI 4472 with two DAQmx create channels. The channel selection is random. For eg. first create channel i have ch. 0, 2, 4, and 6 and the other create channel is Ch. 1,3,5 and 7. This I can do, but the problem is that I need to write the acquired data in seperate files for each channels and that too in sequential order. How can I do that. I know i need to use the loop but how will I will select the channels from two different task.
Thanx in advance
Nitin

Ok, here was my idea, I am not sure if it will work for you or not after looking at your VI.
You can use some of your subVIS that you made to make the path different for each file. But what I had in mind for the channels was what I did in the vi i attached. You can just repeat the process for each of the channels and you would know that they were saved correctly. You could also feed in the iteration number of the main VI while loop to have the binary files change sequentially (ie, data1, data2, etc).
Again, this may not be a route you want to take, you may have other ideas.
Ill try to work on it some more later, but I have to get back to work for now
Kenny
Kenny
Attachments:
pxi subvi idea.vi ‏31 KB

Error-200220 occurred at daqmx create channel %28AO-Voltage-Basic%29.vi%3A3

Hello
i need u r help this error apeears to me when i run my code on labview
and i dont know how i can solve it due am still wake and dont have background on labviw
and coding
(error-200220 occurred at daqmx create channel (AO-Voltage-Basic).vi:3)

ok the first problem is solved...
but now in the another program
its appearing:
Error 1 occurred at Read File+ (string): Read File
Possible reason(s):
LabVIEW: An input parameter is invalid. For example if the input is a path, the path might contain a character not allowed by the OS such as ? or @.
=========================
NI-488: Command requires GPIB Controller to be Controller in Charge.

How to remove channel from DAQmx create Task.vi

Vikas H. Kumthekar
ASE
Tata Consultancy Services
Pune-1

How are you using the DAQmx Create Task.vi? Are you using it to include a global channel or copy a task that was previously created in Measurement and Automation Explorer (MAX)? If this is the case the only way to remove a channel would be to delete the global channel or modify the physical channels for that task in MAX. If you are creating a new task you can use the DAQmx Create Channel.vi to specify the physical channels that you would like to include or exclude.
Regards,
Andy F.
Applications Engineer
National Instruments
National Instruments

Daqmx Create Virtual channel timeout

Why almost a minute and a half to get an error message from daqMX Create Virtual channel VI.
I need to find a way to have my executable bleep immediately if the underlying drivers are not installed.
For example, I have LV at home and supposedly have the drivers installed too but no hardware connected.
Sometimes I run a that uses daq, however when it encounter Creat Virtual Channel VI it appears to hang for a minute and a half before finally giving an error.
Anyone else been there, done that?
Thanks

Thanks for replying D-cubed.
Actually Im calling create virtual channel in a state machine to set up the data acquisition.
When using on a machine that has a daq device installed its a piece of cake. no sweat.
However, when I am at home I have LabVIEW but possibly either no daq drivers or no daq hardware.
I believe it may be the second case since I can place a task on the BD so, I will assume the drivers are installed correctly.
There is just no daq hardware in the system.
WHen the create virtual channels Vi is called the PC appear to hang because that VI is executing internally (looking for a device I presume).
The timeout takes 1.5 mins and if not for me waiting the PC would appear to be hung up.
Finally some 'Mig error' message appear contact Ni about and so on.
WHat I am trying to do is have my program error out immediately instead of 1.5 mins later that there is no Daq device in the system.
Thanks again

Error code -88708 with DAQmx Create Channel (AI-Voltage-Basic)

Hi,
I am trying to construct a VI that moves a piezoelectric stage, the VI then needs to scan voltages from the DAQ card to build up arrays of the voltage and coordinates before constructing a 3D graph.
The VI successfully moves the stage and reads the position back to me but when it tries to scan voltages from the DAQ it fails (I'm using the DAQmx Create Channel (AI-Voltage-Basic).vi example, as this has been used in a previous, similar (and successful) VI within my department.)
I get the following error code:
Error -88708 occurred at DAQmx Create Channel (AI-Voltage-Basic).vi
Possible reason(s):
The specified resource is not available. The operation could not be completed as specified.
Task Name: _unnamedTask<1>
Any help on this would be appreciated - I'm fairly new to LabView and am at a loss with how to fix this!
Thanks
-Tom

Is this working when you restart the computer? It might be that the recources are still recerved because the Clear Task.vi wasn't executed (either it`s not present or you did use the abort button).
Felix
www.aescusoft.de
My latest community nugget on producer/consumer design
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Creating two channels with two "daqmx create channel.vi"

Hey guys,
I'm perform some piezo measurements and my program has one channel for the input (signal that excites the piezo) and one channel por the output (piezo's response).
Since the amplitude of the piezo's reponse varies a lot, my program adjusts the range of the acquisition changing the "minimum value" and "maximum value" properties in the " daqmx create channel.vi". Such an adjustment makes no sense in the input channel once the excitation has constant amplitude.
That is why I need to use two "create channel.vi". I could create the two channels with a single VI but if I did so, I would not be able to adjust the "maximum/minumum value" of only one of them.
The problem is: Labview always returns the error 50103: The specified resource is reserved.
Below, we have a screenshot of this part.
I tried also to add one "daqmx timing.vi" and one "start task.vi" for each of the "create channel.vi" and synchronize everything via error cluster but it returned the same problem.
The program itself is also attached but I don't think it will be useful.
Please, help me guys!
Regards,
Lucas
Attachments:
two create channels.JPG ‏108 KB
consertando burrada.vi ‏330 KB

Try it like this:
EDIT: OOP, I got the Mins and Maxs reversed.
Using LabVIEW: 7.1.1, 8.5.1 & 2013

Missing subVI DAQmx Create AI Channel TEDS(sub_.vi DAQmx Create Channel( TEDS-AI-Voltage-Basic). vi.

Hi,
    I have seen several discussion regarding this topic, however it seems that none of the solutions are working for me. Here is my situation, i am using LabView 7.1 which I use to generate my .EXE, when I generate my .EXE I use the Tab Intaller Settings to generate the Setup.msi. I then take the folder which contains the .EXE and the installer and bring it over to another machine which is running VM Ware with a freshly installed windows XP. (to make sure nothing is on the machine and then i get surprise at the custormer's site)
   Once this was done, i would start by lauching the installer and then the .EXE the result was the following, I would get the following message:
Missing subVI DAQmx Create Task.vi in VI instance      1    3tst
.vi.
Missing subvI DAQmx Create channel (TEDS-AI-Voltage-Basic).vi
in VI Instance 1   3tst.vi.
Missing subVI DAQmx Create Channel( AI-Voltage-Basic).vi in VI
instance    1   3tst.vi
Missing subVI DAQmx Timing(Sample Clock).vi in VI instance
1   3 tst.vi
Missing subVI DAQmx Read(Analog 1D Wfm NChan nSamp).vi in
Vi instance   1   3tst
then as suggested in other discussions of this forum I download (537MB) and installed
on the target machine (VM Ware) the nidaq710 which i downloaded from
http://digital.ni.com/softlib.nsf/websearch/C1F802E457EA042586256DD00001B0C9?opendocument&node=132070_US
This did solve some problems BUT I am still getting the following message when I launch the EXE
Missing subVI DAQmx Create AI Channel TEDS(sub).vi in VI DAQmx Create
Channel(TEDS-AI-Voltage-Basic).vi.
Thank you
Maldini

Hi Maldini,
Thank you for posting to the NI forums. Is the VM Ware PC using the same operating system as the development PC? Also, are you using DAQmx 7.1 on the development computer, or are you using a more recent version? When distributing applications, the driver version on the deployment PCs must match the driver version of the development PC.
If this is already the case, then you shouldn’t be receiving any of these error messages. There are few things that may fix this problem.
Reinstall the DAQmx driver.
Perform a repair install the DAQmx driver on the deployment computer.
Upgrade the DAQmx driver on both the development and the deployment PCs.
With Windows XP and LabVIEW 7.1, you are able to use the latest version of DAQmx, which is currently DAQmx 8.5.
After going through these steps, please post back if you continue to have problems.
Ed W.
Applications Engineer
National Instruments

Empty task out from DAQmx Create Virtual Channel (VI)

Hi,
I'm using a NI USB_6008 in my project and I use ao0 to provide my device with supply-voltage. And I use ai1 to measure voltage on my device. The thing is that I have been using another identical USB_6008 before, and everything worked just fine, but now when I want to use this new DAQ, it doesn't work at all and I get "empty" or "unnamed" task out. I have the right serial-number and device-number in my hardware initiation. And I have used the test panel in "Measurement & Automation Explorer to check that the channels works properly. I have also changed the USB-port and also updated my drives. But nothing has helped.
Unfortunately I can not send the code here since it's too big and complicated but I'll attach a screen-shot of the part the I'm stucked in with the "probe" values.
I'll really appreciate it if someone could explain for me why I get "unnamedTask".

Just came across this while looking for something else.
Your tasks are unnamed because you haven't named them . You can name your task when you call DAQmx Create Task.vi:
In the case of the first VI, the task is being implicitly created when the channel is created, so an "unnamed" task is the result.
Best Regards,
John Passiak

How DAQmx Create Channel for Accelerometer will convert the voltaage signal into g

HI all,
I want to know about DAQmx Create Channel for Accelerometer hoe it will do the convertion any one reply me
Regards,
Santhosh M

Most of the accelerometers that i have used till now are ICP devices.
They need about 5mA current to power them selves up. Other wise they give inaccurate output.
I guess you are measuring a raw time domain vibration signal.So you just need to
I have attached my own code of how i acquires a vibration signal usin PXI-4462 and 4461 modules. Keep it secret till i do my thesis .
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DAQmx- create channel- no channels found

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