Warning 200015 occurred at DAQmx Write (Digital Wfm 1Chan NSamp).vi:4

Hi,
Attached is the VI I write. But there is a warning: Warning 200015 occurred at DAQmx Write (Digital Wfm 1Chan NSamp).vi:4
I want to use digital channel to create an output. The duty cycle change from 30% to 50% to 70%. At the same time, measure the input of another 2 channels.
Do you have any idea about this?
Thanks.
Attachments:
Digital pulse_DO Channel-1_mod2.vi ‏39 KB

Hello,
The situation that you are seeing here can be identified as 'glitching'. Glitching occurs where there is potential for previous samples in a buffer to be mixed in with newer samples written into the buffer, causing a signal output that is a mix between the old and new data you are trying to output. In the DAQmx Help document, search for 'glitching' and you will be directed to an article which explains glitching, mentions Warning 200015 is thrown where there is a potential for this to happen, and then offers suggestions on how to work around this issue, as well as two pictures that clarifies what could happen with glitching.
This warning pops up in your application since you are writing one set of data and then writing a second set of data afterwards. If you do not see glitching on your signal, you can modify your code to ignore this warning. Read through the help document for suggestions on modifications that will work for your application.
Kyle A.
National Instruments
High Speed Digital I/O Product Support Engineer - R&D

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Can DAQmx write (Digital Wfm 1Chan NSamp) output to physical channels on multiple ports?

I'm writing some code to manage waveform outputs across multiple devices. All of the hardware presently at my disposal has at most one port of timed digital output. However, this might change in the future, and I want to make my program as general as possible. Is it possible to build a virtual channel containing lines on multiple output ports and then write to all lines of this virtual channel using a single DAQmx Write (Digital Wfm 1Chan NSamp) call? Is DAQmx Write (digital Wfm 1Chan NSamp) restricted only to lines on the same port? Do I need to use a separate virtual channel for each output port? Thanks.
Jason Rolfe

Hello Jason,
You can create a task that contains lines from different ports of one same device. You can also define the "lines" input of your Digital Output DAQmx Create Channel vi to be for example Dev1/port0/line0, Dev1/port1/line0. DAQmx Write (digital Wfm 1Chan NSamp) is not restricted only to lines on the same port as long as it's from the same device. No, you don't need to use a separate virtual channel for each output port.
Hope this helps,
LA

Error -200428 Occurred at DAQmx Write (Digital Bool 1Line 1Point).vi

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Have you read the explanation for the error and did you verify the task or virtual channels exist?

Error-50150 occured at DAQmx Write

Hello,
I am experiencing a seemingly random error in a large program. The error occurs in a part of the program that simulates tach signals to a CPLD. I have not been able to find out what conditions cause this error, it seems to be random in nature.
The full error reads this:
Error - 50150 occurred at DAQmx Write(Digital 1D U16 1Chan Nsamp).vi
Possible Reasons:
The software has entered an unknown state-usually as a result of a cascade failure induced by an unexpected series of state inputs. The operation could not be completed as specified and you should immediately terminate all further transactions if you are able to do so.
Task Name:TackABC_Write Port0 U16
The device we are using is a PCI-DIO-32HS, with Labview 7.1, NI-MAX 4.1, and DAQmx drivers 8.3.1. The task writes 3 signals to the CPLD, and it works most of the time, but every so often this error will occur. I was wondering what could be the cause of an error like this?
Thanks, Steve

Hello Brian, thanks for the response.
I made a mistake in my last post, it is actually a DAQmx clear task in place of the stop task vi i mentioned. When we first received this error it had no clear task at the end, but I added one. Even with this the error has still shown up from time to time. Would it help at all to add a reset device vi afte the clear task vi?
I took some screenshots for you as well. The first shot is of the function in question, the second is the same shot with the case turned to false, and the third is the inside of the main subvi. When the error occurs it focuses on the write vi that is inside the subvi. Let me know if there is more info I could grab that would make things mroe clear.
Thanks,
Steve
Attachments:
SS3.JPG ‏160 KB
SS1.JPG ‏189 KB
SS2.JPG ‏181 KB

Error -200609 occurred at DAQmx Write: Selected Buffer Size Too Small

Hello, I'm writing some simple test VI's that I will eventually build upon to make an externally clocked analog output VI. I started with a very simple program to output finite samples using the onboard clock with the DAQmx Timing.VI. When I run the program, I almost immediately get an error. The error message is below.
Error -200609 occurred at DAQmx Write (Analog DBL 1Chan 1Samp).vi:1
Possible reason(s):
Generation cannot be started, because the selected buffer size is too small.
Increase the buffer size.
Conflicting Property
Property: Output.BufSize
Corresponding Value: 1
Minimum Supported Value: 2
Task Name: _unnamedTask<1C>
I have used DAQmx VI's before in similar applications and never encountered this error. Additionally, I read at the link below that DAQmx Timing.VI should be generating the buffer automatically. Any ideas as what could be causing this?
Specs:
Windows 7
Labview 2012
PCIe-6353 as DAQ board
Below is a picture of my block diagram and the VI is attached.
Solved!
Go to Solution.
Attachments:
FiniteSamplesTest.vi ‏18 KB

Oops. Just realized my very silly mistake: I forgot to add the Start Task VI. I did so and it works as designed.

Error 10003 occurred at ULx Read(Analog Wfm 1Chan NSamp).vi?

Hello I am using the Measurement computing hardware USB-2416 and when I run the following Vi (Screen shot attached and the VI was made by following the video http://www.youtube.com/watch?v=GqyooarvbuM) I am getting the following error
Error 10003 occurred at ULx Read (Analog Wfm 1Chan NSamp).vi
Possible reason(s):
Measurements: Some or all of the samples requested have not yet been acquired.
To wait for the samples to become available use a longer read timeout or read later in your program. To make the samples available sooner, increase the sample rate. If your task uses a start trigger, make sure that your start trigger is configured correctly. It is also possible that you configured the task for external timing, and no clock was supplied. If this is the case, supply an external clock.
Attachments:
daq.PNG ‏38 KB

You have a rate of 93 and are collecting 1000 samples. Is that what you want? That is not what the video shows.
That means it takes about 10.75 seconds to collect 1000 samples. I bet the timeout for the function defaults to 10 seconds. That means you will have only collected 930 samples and thus explains why you get this error message.

"exception ocurred". Vi stopped at node 0x4d8 of subVI "DAQmx write (Analog DBL 1Chan 1 samp)

I get this message when running a VI that contains this subVI for a long time (2 hours). How can I solve and locate it?

Are you using the auto-start feature of the DAQmx write VI ? If you wired "true" to the auto-start input or left it unwired, then the auto-start feature is being utilized. If you disable auto-start and explicitly start the task, does the problem persist?

Illegal operation occures running a 'Write Digital Line' vi in Test Executive

I'm switching a single line of a PCI DIO 96.

Hi,
I have a PC set up with Labview 5 and Test executive 5.1. I'm trying to create a vi that can be run in test exec that will allow me to control any of the DIO lines of a PCI DIO 96. When I put the vi in a sequence and try to exit the edit screen the Test exec stops and an 'illegal operation' window appears.
I have also tryed this with the DIO example that comes with labview 'Write 1 point to digital line.vi' and the same occurs.
I hope this explains it better.
Many thanks
Rob

Error -200587 occurred at DAQmx Start Task.vi:7

I am running the attached code Merrit_Coil_calibration, and I get the following error:
Error -200587 occurred at DAQmx Start Task.vi:7
Possible reason(s):
Requested operation could not be performed, because the specified digital lines are either reserved or the device is not present in NI-DAQmx.
It is possible that these lines are reserved by another task, the device is being used through the Traditional NI-DAQ interface, or the device is being reset. You might also get the error if the specified resource is currently in use by LabVIEW network variables bound to the DAQ Channel, or if the DAQ Channel is being used in any OPC Client software.
If you are using these lines with another task, wait for the task to complete. If you are using the device through the Traditional NI-DAQ interface, and you want to use it with NI-DAQmx, reset (initialize) the device using the Traditional NI-DAQ interface. If you are resetting the device, wait for the reset to finish.
Device: Dev2
Task Name: _unnamedTask<F>
I am calling the same DAQ, many different places in my code and I think that is the problem, but I can not figure out why or hw to fix it. Anyone have any suggestions?
Attachments:
Final.zip ‏2434 KB

Thank you both for your input. I slightly changed my code to Merritt_Coil_calibration (updated code attached) and the first error went away, but now I have a different one which is:
Error -200429 occurred at DAQmx Write (Digital U32 1Chan 1Samp).vi:1
Possible reason(s):
Value passed to the Task/Channels In control is an empty string (or I/O control).
The value must refer to a valid task or valid channels.
As far as what DAQ device I am using, it is the NI USB 6009. I am only using digital port 0. During different pieces of my code I send different values to port 0. I am using this to drive some stepper motors. I thus send square waves on the different pins on port 0. I do not know if this is exactly what you were asking.
Whatever the case, I was wondering if anyone knows why this error occurs and how I could fix it.
thanks.
Attachments:
honorsproject.zip ‏256 KB

Error 229771 occurred at DAQmx Start Task - only in Labview project

Labview 2011 sp1
os: W7 32bits
DAQmx 9.7.0f0
ni-PCI 6251
Hi,
I'm working with a ni-PCI 6251 card. I got the error : Error -229771 occurred at DAQmx Start Task. Possible reasons :Internal sofware error occured in MIG software ... when I'm trying to launch my data acquisition vi. This error was already reported in this post :
http://forums.ni.com/t5/Academic-Hardware-Products-NI/Error-229771-occurred-at-DAQmx-Start-Task/td-p...
I tried to reinstall DAQmx as explained in the post but it unfurtunatly it did'nt fix my issue.
I've notice the following points :
1. This error appears randomly, after several reboots the vi will finally run without error
2. The error only appears when the vi is included in project
I will really appreciate any kind of help.
sebastian
Attachments:
test_daq_2.vi ‏23 KB

Bonjour,
Je vous invite à jeter un oeil sur le lien suivant :
http://digital.ni.com/public.nsf/allkb/03123D0E8A36C48E862577A4005B6BAA?OpenDocument
Il devrait résoudre votre problématique.
Cdlt,
Matthieu RICORD
National Instruments France
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Error 200380 occurred at DAQmx perform bridge offset nulling operation

I had a working VI that could balance a wheatstone half bridge and read and record measurements. My sensors are attached to a SCXI-1314 modle in a 1520 box in channel 0 (positioned as in the manual for half bridge) with the completion resistors in the appt places in ch7. It used 'custom voltage with excitation'.
Wanted to improve this VI so that it would also do a shunt calibration. I therefore connected the shunt resistor in the board over my active sensor as in the manual. I tried then to create a virtual channel for it - but it wouldn't work. So I gave up on that idea and tried to put things back how they were - deleted the virtual channel, and removed the connections to the shunt resistor. Except now none of my previously working VIs will work. I have built a new VI, and that can find a signal but not balance the bridge. I get:
error 200380 occurred at DAQmx perform bridge offset nulling operation.
I have checked the hardware again, and it's all wired correctly - it seems like the VI can see the channel but doesn't know what to do with it. Have running the VIs with and without a custom voltage with excitation channel created but nothing works.
Help!

Hi LucyWH
Have you tried re identifying the chassis in Measurement and
automation explorer?
Have you changed the jumpers at all as when rewiring this is easily
overlooked?
I have found some links that you may find useful:
Error -200380 When
Calibrating SCXI-1520 in NI-DAQmx
http://digital.ni.com/public.nsf/allkb/6E94108C9611910186256D43007C2584?OpenDocument
Common NI-DAQmx Error
Codes and Solutions: Codes -200300 to -200999
http://digital.ni.com/public.nsf/allkb/8A0E097385A4269586256DBA0054E668?OpenDocument
Regards
Robert
National Instruments UK & Ireland

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.
The help "name to assign" input for the DAQmx Create Channel VI says
If you use this input to provide your own names for the virtual channels, you must use the names when you refer to these channels
in other NI-DAQmx VIs and Property Nodes
OK, so how do you use the name assigned in other VIs?
George

George,
I think that there may be some confusion here about the difference between local and global virtual channels. First of all, please take a look at the following knowledge base:
Physical Channels, Virtual Channels, and Tasks in NI-DAQmx
As discussed in this KB, local global channels are created inside a task, and they only apply to that task. In the help file for the DAQmx Write VI, the "task/channels in" description says "if you provide a list of virtual channels, NI-DAQmx creates a task automatically." When you wire a string to this input, a new task is being created, and unless the channel name that you wire in is a global virtual channel (listed in MAX), you will get the error 200428 that you mentioned. This is because that virtual channel that you are specifying is local to another task and is not associated with this new task.
One solution to this issue is to use the DAQmx Save Global Channel VI to save your local virtual channel as a global virtual channel before calling DAQmx Write. Once this is done, you can then wire the same string constant to the "task/channels in" input of DAQmx Write or other DAQmx VI's.
The help text is still correct, but is only applicable in certain situations. For example, if you create and name an analog input local virtual channel with DAQmx Create Channel, you could then use this channel name as the source input to a DAQmx Trigger VI configured for an analog edge start trigger. You could also use that channel name as the input to the "ActiveChans" DAQmx Channel Property, which would enable you to modify the properties of that particular channel.
Hopefully this information is helpful to you.

DAQmx Write - Append samples to buffer

I'm developing a program to play back a waveform from a large file on disk. This is 72 hours of 1kHz data on 4 channels. I can't load the entire waveform into memory, so I wanted to feed the DAQ task 1 minute at a time. I figured that I would read in a minute of file data, convert it to a waveform, and then write it to the DAQ task. While that one minute is being sent out, I can read in the next minute and convert it and have it ready to load into the DAQ task.
The problem is that the DAQmx Write function has two "Relative To" options, "First Sample" and "Current Sample". Given my idea above, I'd expect that there would be a "Last Sample" option as well so I could just tack on the next block of data to the end of the currently playing sample.
I need to avoid any glitching on the line. I'm not sure if a simple write in a loop will be fast enough to copy the new data to the DAQ buffer. I don't have my hardware yet, but I'd like to have the basics of my application set up so I can plug in the hardware on the day it gets here. But I don't want any nasty suprises that would cause me to completely restructure my software.
Are there any other functions that I could look at in order to accomplish my goal?
Brian Rose

Hi Brian,
I am not sure what devices you are using, version of DAQmx and LabVIEW you are using but I have some ideas that hopefully will help you out. First off, I wanted to reference you to an example in the NI Example Finder that I was using for testing. The example is called "Cont Gen Voltage Wfm-Int Clk-Non Regeneration.vi" and can be found by Help>>Find Examples>>Hardware Input and Output>>DAQmx>>Analog Generation>>Voltage. This example is what you should base your code off of because it continually writes samples to the buffer every iteration. Make sure though to set the "Relative To" DAQmx write vi to "current write position". This needs to be added when you are setting up the generation in the DAQmx write property node. This setting will write the data to the end of the buffer and not overwrite your waveform. Also, you will need to change your waveform you are writing to the DAQmx Write vi to the waveform you are reading from the file. It sounds though that you already have this portion set up.
Regards,
Jordan F
National Instruments

Erreur DAQmx Write

Bonjour,
que signifie cette erreur ?
L'erreur -50405 s'est produite à : DAQmx Write (Analog 1D Wfm Nchan Nsam).vi:2
Raisons possibles :
Aucun transfert n'est en cours car le transfert a été abandonnée par le client. L'opération n'a pas pu être achevée telle que spécifiée.
Nom de tâche : _unnamedTask<0>
Merci d'avance ;-)

Bonjour Ptit Kn@rd,
Merci d'avoir posté sur le forum National Instruments.
L'erreur semble spécifié qu'aucun point n'a été transferé à la carte et que par conséquent la fonction DAQmx Write n'a pas pu etre executé.
Peux-tu nous en dire plus sur ton application et à quelle occasion rencontres-tu l'erreur?
Ca nous permettra de t'aider plus facilement.
Bonne journée
Flo
Open Diagram First

Error -1073807346 occurred at VISA Write in rsspecan_core_write.vi

Possible reason(s):
VISA: (Hex 0xBFFF000E) The given session or object reference is invalid.
I'm using a USB to GPIB connection to a Rohde Schwarz FSV30 Spectrum Analizer from Windows 7.
My program works 100% in LabView but the problem comes in when I've compiled the program into an executable.
I have already installed the NI VISA Run Time Engine 5.0.1 and it still does not work.
I've also installed the NI-488.2 2.73 drivers for the GPIB unit.
Any ideas?
Solved!
Go to Solution.
Attachments:
Error -1073807346 occurred at VISA Write.png ‏30 KB

Hey,
the problem when building executables with LabVIEW is, that the driver core of the attribute based instrument drivers (esp.. the VIs which are creating this error) is linked while runtime dynamically to the VIs. The application builder which follows all dependencies and include them into the package fails in this case.
To get a running executable please add manually all VIs for the folder <inst lib>\rzspecan\_utility\rsspecan_core\callbacks\ to the LabVIEW project and everything should work fine.
For more details of this driver refer to http://www.rohde-schwarz.com/appnote/1ma170
So long, juergen

Warning 200015 occurred at DAQmx Write (Digital Wfm 1Chan NSamp).vi:4

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