DAQ-PXI 6259

Hi,
I am using Labview 7.1 and NI PXI 6259 DAQ card.
I want to configure 'n' no.of digital channels at a time but each channel has to stop the task at different time.Is it possible to do this??
Suppose consider i need to configure some 8 digital channels in that i need to write 4 channels continuously and 5th channel for 5 seconds,6th for 3 Seconds,7th for 2 seconds,8th for 10 seconds.I will come to know abt the no.of channels and whether it is for continuous or for finite time only at run time.Is there any method to configure the virtual channels by grouping all 8 channels but stop each channel at different time??
Plz help me in this
Regards
Meenatchi

Hello Meenatchi,
It appears what you are trying to do is to use synchronized digital output so that one sample is output on all of your lines at the same time, for different lengths of time. If this is the case, then what Britoa suggests is probably the best way to go about it. You can programatically "decide" what you want to output and then build a digital waveform to reflect the behaivior you want to see. For example, if you wanted to output at 1kHz and you wanted channel 1 to output continuously while channel 2 only output for 1 second, then you would programatically construct a waveform where channel 2 was set low after 1000 samples. The example that I would start with would be the Cont Write Dig Port-Ext Clk-Non Regeneration.vi
As far as having different tasks running, the only way you can do that is if you use software timing (1 sample On Demand) for the different lines. You can then create a different task for each line and stop them independently as shown here:
Your lines will not be synchronized, but you could then use a case structure to decide whether to write to each line or not.
I hope this gives you a place to start, post back if you have any issues programming this.
Message Edited by Neal M on 12-26-2007 01:42 PM
Neal M.Applications Engineering National Instruments www.ni.com/support
Attachments:
2DigLines.JPG ‏97 KB

Similar Messages

Does NI PXI-6259 support both Traditional DAQ and NI-DAQmx of Labview 7.0 Express?

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M-series boards are not supported by Traditional NI-DAQ. Stick with the E-series if you require Traditional support.
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there any example or link any one can send me , thanx in advance.

Dear HaI L,
I managed to send a test signal (sine wave) to the device by choosing
the test panel option and choosing Analog output. In the analog output
I could many channels to choose from. ai0, ai1.ai2 and ai3.
I did this by right clicking NI PXI-6259, in the NI DAQmx devices
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Attachments:
max.jpg ‏2305 KB

Error in reading voltage using DAQmx with PXI-6259

Hi,
We are trying to acquire analogue voltage from 5 channels using PXI-6259. We trigger the data sampling with clk 0 (i.e. using PFI 12).
The problem we had is:
1)When we tried to get voltage from 5 channels, we get 2 data at the same after twice the period. For example, If we set the
sampling rate to be of period 1 second, we get 1 signal at 2 second and around (2+t), where t is a random time less than the execution period of the loop.
Then the next cycles would be 4 second and (4+t).
2) This timing problem did not occur if we only acquire voltage from 2 or less channels.
3) We tried to run exactly the same program with NI USB-6210 and everything worked just fine.
4) We replaced the DAQmx read with DAQ assistant and still encountered the same problem.
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Arul (CLAD)
Attachments:
test rig.vi ‏74 KB

Good afternoon Nitin,
Thanks for contacting National Instruments with your issue, we'll try our best to resolve it for you as quickly and efficiently as possible.
As the error message stated:
"Analog input virtual channels cannot be created out of order with respect to their physical channel numbers for the type of analog device you are using. For example, a virtual channel using physical channel ai0 must be created before a virtual channel with physical channel ai1."
If you need to randomly switch which channels you want to either control IEPE excitation or coupling on, a better approach rather than having all of these channels in one task as you've done in your attached VI, is to parse your program down to multiple tasks that can run simultaneously.
I have attached a screenshot of this approach, which hopefully is not a compromise to your application.
Best of luck with your project.
Sincerely,
Minh Tran
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Attachments:
ParallelTasks.JPG ‏52 KB

NI PXI-6259でのデータ集録におけるエラーについて(デバイスのリセット)

NI PXI-6259でBNCコネクタを介してエンコーダのパルスをトリガとして圧力や流量などのデータ集録を行っています．大体は異常なくデータ集録が可能なのですが，たまにエラーとしてデバイスをルーティングに使用できなく，デバイスをリセットするか，リセット中の可能性がありますと表示されます。このような場合，どのように対処すればよろしいでしょうか？

櫻田様
早速のご返事，有難うございます．
現在，私は以下の製品を使用させて頂いております．
・PXI-8187 RT2.5GHz リアルタイム組込コントローラ（Windows XP，Lab VIEW 7.1）
・PXI-6259 Mシリーズ多機能DAQ（BNC-2110コネクタブロックを用いて，エンコーダからのクロックにより圧力，流量のデータ集録）
・PXI-4351 高確度DAQ（熱電対で測定した温度のデータ集録）
・PXI-7344モーションコントローラ（ステッピングモータ角度調節）
上記の製品を用いて，エンジン計測および制御を行っております．
プログラムの内容としては
エンコーダからの1P/Rのトリガによりデータ集録を開始し，360P/Rのクロックを元に圧力，流量のデータ集録を行っております．
今回生じたエラー（毎回起こるわけではなく，たまに起きるのですが）はおそらくデータ集録を開始する以前のVI｢DAQmx｣で生じ，エラー番号は89130で
｢デバイスをルーティングに使用することができません．デバイスをリセットするか，デバイスがリセット中の可能性があるため，リセットが終了するのをお待ちください｣
との内容でした．
実際には，データ集録の際にMAXでデータ集録項目やポートなどを設定しており，
MAXの方で，テストを実行した際にも同様のエラーが発生しました．
エンコーダからのパルス信号に異常はないため，
やはり，PXI-6259の問題なのでしょうか？
ご返事，宜しくお願い致します．
大村

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Putting together another data acq. system that has PXI-6259 cards. Attached is how I have typically wired in the past with TBX-68 terminal boards, however when I go to ni.com and look and the manual it does not agree with my typical witing scheme. Any idea why they dont agree?
Attachments:
AI.pdf ‏10 KB
NI-6259.pdf ‏89 KB

You have it correct. For channel 1 (technically channel 0, because we like to 0-index everything) in differential mode the DAQ card takes inputs on AI1 and AI9 and compares the two values. It doesn't reference directly to ground, but instead references one to the other. This document might do a better job of explaining it: Field Wiring and Noise Considerations for Analog Signals. The scheme we have for differential inputs is to typically have the inputs be 8 AI channels apart (AI2 goes to AI10, AI3 goes to AI11, etc.)
Edit: Consider reviewing this resource for double-checking wiring connections using DAQmx Tasks in MAX:
Using Connection Diagrams for NI-DAQmx Tasks
Tim W.
Applications Engineering
National Instruments
http://www.ni.com/support

Three Counters in PXI-6259

Hello Everyone,
I'm trying to measure time t in the picture that I have attached. I am using a PXI-6259 for this (both input and output). My first idea is to use one counter to generate the input, another counter to time when to stop the first counter and the third counter to measure time t. However, I find difficulty in getting the timing correctly, especially, the second timer.
Do you have any ideas on how to do this?
Thanks
Attachments:
picture.JPG ‏27 KB

Hi P.Jack,
I would like to ask for a bit more information about your
project and DUT. Creating a pulse as input for the DUT is not a problem. Examples
can be found in the LabVIEW example finder ((Help >> Find Examples…
>> Hardware Input and Output >> DAQmx >> Generating Digital
Pulses). Please keep in mind that the finite pulse train uses both counters
(one to generate the train, and one to count the number of pulses that have
been generated). Continuous generation only uses one counter, leaving you with
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Is the DUT output a TTL signal ? Also, is this a stimulus
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I gathered from the picture). The overall task you are looking to accomplish
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If hardware timing is essential, I would suggest a PXI-6602 counter/timer card.
This will allow you to use two counters to create the pulse train, and another
two to do a buffered counter acquisition.
If partial software timing is OK for this project, than the
6259 can accomplish the task. I would do a pulse generation, and then once this
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constantly monitor the line until it goes low. You would put tick counts before
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Systems Engineering
National Instruments

Adlink daqpilot not working in subvi (DAQ/PXI-2204)

Using DAQpilot from Adlink
in Labview 2010 / windows 7
I want to do n-channels, n-scans, single shot in a while loop
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-installed device: DAQ/PXI-2204:0
-n-chs: 0-31 differential
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The DAQ pilot runs once and continously in a sub vi:
It also works when I place the task in a loop.
But when I use it in a sub vi which is called from another vi in a loop it work the first cycle and the second not, third ok, fourth not. see diagram below:
following error message:
Attachments:
test_3.vi ‏67 KB
while_loop.vi ‏13 KB
tset3.zip ‏4 KB

Hello!!!
You do not need to put the "Configuration Parameters Setting" inside a loop.
These configuration are needed just one time.
If you want to change these parameters for other acquistion, you can put these steps inside a case structure and when you need to change those configurations values you've just to call the "Configuration Case" and do it before the new acquisition starts.
The acquisition need to be continuous, not the configuration.
You can found code examples on this link below:
www.ni.com/code
Hope this helps,
Regards.
Barbara Pracek
Engenharia de Aplicações
National Instruments Brasil

2.7 year experiance in labview, DAQ, PXI, PCI seeking job

chennai based
2.7 year experiance in labview, DAQ, PXI, PCI seeking job
Attachments:
sen 3.doc ‏81 KB

Thanks for your help,
I've finally got rid of the errors, but when i run the VI while using the potentiometer, i'm not getting any readings on the graphs (on the front panel). I've checked for errors but cannot find any...
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Thanks
p.s. i've attached the VI so you can see what i mean...
Attachments:
Pitch Analysis1.vi ‏321 KB

PXI-6259 2 KHz signal acquire, sound

Hello:
I working with a brakin product ABS motor, with a PWM at 2.8 KHZ, my setup:
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when I fire the motor in order to measure the peak current and the motor stable current, a sound coming from the PXI chassis like if the Analog card reproduce the 2.8KHZ signal in sound, if i reduce the frequency from the product to 2KHz the sound is loud,
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attached you can find a complete data coming from the product to the analog card.
the results are good just is bother me the sound,
thanks in advance
Javier Reyna
Attachments:
FIRE.xlsx ‏3125 KB

The frequency and voltage range that you are using are definitely within specifications for the PXI-6259, and if you notice a sound from the chassis, it is due to the fans, which I agree with you it can be very loud. The fact a slight change in frequency would produce a different sound from the chassis is rather strange. Not sure if it's just the noise volume that increases, or if it's like a high pitch sound changing.
What would be more useful is that you record this noise to a .wav file (hopefully good quality audio) and upload it here, to determine if the sound is normal or not.

PXI-6259

Some PXI board can operate in CompactPCI chassis. Is it the case for the PXI-6259 ?
What are the limitations ?

Hello,
In this documentation about the PXI-6259:
http://www.ni.com/pdf/manuals/371022k.pdf
You can find some information about compactPCI <=> PXI compatibility (page 164.)
This link could be helpful as well.
http://www.pickeringtest.com/static_pdf/PXIHWSPEC21.pdf
Hope it will help,
Waiting for your feedback,
Regards,
MatthieuR
Matthieu RICORD
National Instruments France
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Été de LabVIEW 2014
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How to synchronize NI PXI-6534 and NI PXI-6259?

Hi,
I am trying to output a continuous analog waveform (sine, dc, ramp, etc) using an AIO card (6259) and a DO pulse (using the PXI DIO 6534 card) with a customizable Duty cycle in each period of the AO signal. I need them to be in sync. Both cards reside in the NI PXI-1042Q chassis. I am using this solution as an example but can't get it work.
Also, my DO card cannot write high-frequency pulses on one line - I should instead use the entire port. It also cannot produce CO pulses.
Can anyone help with a simple vi? What is the correct way to synchronize these two cards (I am a beginner in LV) in one crate?
Thanks in advance,
~Paul

Hi Paul,
I see that has been a while since there were no activity here.
Did you manage to synchronize them?
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Best regards,
IR

DAQ PXI 6527 sous Teststand

Bonjour,
Je travaille actuellement sur le développement d'un programme de test automatique sous Teststand v3.1. Pour cela, je dipose d'un châssis PXI 1045 ainsi que diverses cartes PXI programmables.
Si je poste ce message sur le forum, c'est parce que j'ai des difficultés à accéder aux fonctionnalités de la carte PXI 6527. En effet, c'est la seule carte pour laquelle je ne dispose pas d'IVI (type Dmm) ou de DLL.
Je n'arrive donc pas à communiquer avec la carte PXI 6527 sous Teststand.
Mon objectif est de programmer la carte de façon à ce que je puisse la commander en Tout ou Rien (sortie à 0 ou 5V).
Comment puis-je réaliser un tel programme sous Labwindows CVI v7.0? Disposez-vous d'exemples?
Comment utiliser le programme CVI sous Teststand?
Cordialement,
Eric59

Bonjour Eric59,
Pour ce qui est de l'utilisation d'un code développé avec CVI sous Teststand, je vous conseille de consulter le manuel suivant : http://www.ni.com/pdf/manuals/375070c.pdf
A partir du chapitre 11, ce document vous explique comment utiliser CVI avec Teststand.
Concernant la carte PXI-6527, quelques exemples existent que vous trouverez au lien suivant : http://sine.ni.com/psp/app/doc/p/id/psp-152/lang/fr
Cordialement,
Celine
National Instruments France
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DAQ PCIe-6259 vs. PCI-6251

Should I buy a PCIe-6259 or PCI-6251 ? ( I think that PCIe-6251 is not delivered in the Netherlands)
Is the software for both cards the same?
What slot do I need with PCIe-6259 in my motherboard, PCI-express x1 or x4 ?
Can I use the terminal block BNC-2110 with a PCIe-6259 ?
Thanks a lot for any help.

Hello,
The PCIe-6259 is a x1 lane PCI express board. Basicly, the driver software is the same for both boards (DAQmx) and programming is not different for these boards. Yes, a BNC-2110 can be used allong with this board. Last, this board should be orderable in the Neterlands without any problems. For more order information you could contact the dutch office and ask for the sales department.
Kind regards,
RikP
National Instruments
Rik Prins, CLD
Applications Engineering Specialist Northern Europe, National Instruments
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PXI-6259 simultaneous updating of AO

Hi, I have PXI6259 M series DAQ cards. Each card having capacity for four analogue outputs with update rate (if using all four) of 1.25MS/s. My overall goal is to be running 11 analogue outputs (using 3 cards) all running at 1.25MS/s. I want to update all channels at the same point in time - I do not want sequential updating of the channels. I have searched the examples but can't seem to find anything that specifically gives me pointers as to how I ensure each channel is updated at the same time. The timing of the updates is important too, so I want to have some kind of hardware timed execution. Currently I'm researching but soon I shall begin to program and measure in the lab. - I'd like to make sure I don't go tearing off down the wrong track! Any hints and tips of what to look out for would be really appreciated. - I'm pretty new to this!
Regards,
George.

Hello George,
Hopefully I can shed some light on this for you. A task such as this would be programmed using VIs which form part of the driver. You probably already have the driver installed - DAQmx.
A great start for getting to grips with DAQmx is this set of tutorials found on ni.com:
http://zone.ni.com/devzone/cda/tut/p/id/5434
You configure settings like finite sampling, sample rate etc in your DAQmx task.
Moving on from there, to ensure all your cards are properly synchronized you have to ensure that each card is using the same sample clock. You will need to route this clock over the RTSI bus. Thank fully DAQmx makes this really easy. See this for a nice example:
http://zone.ni.com/devzone/cda/epd/p/id/5197
Let me know if this is of any help
Nick C.
Cardiff University

DAQ-PXI 6259

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