Ni 6215-USB counter

Hello
We are currently using af NI 6215-usb DAQ to aquiere signals from a quadrature encoder. At maximum speed the encoder generates roughly 33000 pulses per second, which we doesn't count accurately. Our DC-motor turns roughly 90 degrees too much. If we s,low the speed down, we are able to turn very precisely. We are using a digital filter on the counter with a minimum pulse width: 6,425*10^-6, which should fit our setup. Is the DAQ too slow? Or are we doing something wrong in our counting or setup of the counter??
Thanks in advance
Christian Carøe
Attachments:
Block.jpg ‏412 KB

Hi Christian,
I can see that you are doing pretty much everything in one loop structure in Labivew. That's not recommanded when you are have Data acq. and Write to Disk functions. Write to Disk functions are slow compares to your Data Acq. part of the code, and it will slow down your loop execution.
You should implement parallel structures and using e.g. Queue Structures for passing data from Data Acq. loop to the Write to Disk loop.
See. "File --> New... --> VI --> From Template --> Frameworks -->Design Patterns --> ProducerConsumerData Structure" for more info.
For testing the USB-6215 and the Quad. encoder output you can basically create a new VI and only tests the Counter Input part of the code.
Please let me know if this helps.
Thanks!
Message Edited by Morini on 12-16-2009 09:48 AM
Dennis Morini
Field Sales Engineer
National Instruments Denmark
http://www.ni.com/ask
Attachments:
screendump.png ‏21 KB

Similar Messages

Difference between USB6008 &USB6215 counter input?

Hello,
I have to count pulses of a gas meter (5029 pulses = 1 m3 gas).
I did this with a USB-6008 and it works OK. Now I want to switch over to USB-6215 and counting goes wrong.
The USB-6215 counts one cycle random a lot of pulses (e.g. 250) and next cycle 1 as it should be if I select rising edge. This alternating process goes on and on. If I select falling edge then every cycle it counts a lot of pulses more.
I have the inputs connected parallel so both modules have exact the same pulses. Pulses are 4,7V with low frequency 1 Hz till max 100 Hz.
USB6008 input in connection = pin 29 (pulse) & pin 32 (gnd)
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In the MAX same result as with attached LabVIEW program with rising edgge selected.
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Attachments:
gasmeter.vi ‏19 KB

Hello Martijn,
Thanks, yes this works! With digital filtering set on 2,56ms I get with USB6215 same counting as with USB6008.
If I put digital filtering on 6,425 us then sometimes I count too much, at 125 ns this happens regularly but much less then without digital filtering. These are the only allowable settings, on other setting the counter does not work.
Has the USB6008 a standard filter then? With a scope on the pulse input signal I cannot find glitches, so it is for me still a question why a cheap USB6008 performs in this case much more user friendly.
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Geert Wever
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How do I get 12 hardware counter channels?

Hello,
I am wanting to count 12 seperate pulse signals. The USB device I am currently using (6501) has only 1 counter channel that works great for one signal, but the extremely short pulses (@5us) makes software programming a nightmare for 12 signals into the digital inputs lines.
Ideally I would be able to find a dedicated 12 channel usb counter that I can read into labview, but it does not look like an option. It looks like I may have to go with a combination.
What are cost effective combinations of hardware devices with dedicated counters to supply my total of 12 channel counter needs?

As always, "it depends."
What kind of counter measurements do you intend to do? Occasional on-demand measurements or buffered measurements for transient analysis?
People's idea of cost-effective varies too. On the forums, it often means that someone can't spend $1000 on truly suitable hardware, but they *can* spend many extra weeks cobbling together a sub-optimal solution with inadequate hardware.
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Low profile counter/timer board

Does NI (or anyone else) make a low-profile counter/timer board? Perhaps with specs similar to 6602? If not, are there some other options that I could look into (I think the sample rates may be too high to use USB)?
Solved!
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Hi greatgrandpadog,
Unfortunately, NI does not have any counter/timer solutions that are low-profile on PCI.
Our cDAQ-9171 single slot USB chassis has four 32-bit counter/timers that can use an onboard 80 MHz clock (detailed specifications). For external signals, you would need to use one of our digital i/o module which have various specifications. You can find a list of them here. This will be the best way to go for a compact USB counter/timer. If you have additional i/o, take a look at our CompactDAQ Advisor, where you can use a 4- or 8-slot chassis to expand your i/o in a single system. For more sophisticated control, CompactRIO offers a similar platform but with FPGA and Real-Time for greater customization and reliability. There is an online advisor for that as well, here.
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http://www.ni.com/support

Error -20023

Hello
I have now made a program for the USB-6215 for counting signals. I have connected a button between +5V and AI15. It can count every time i push the button, but sometimes when i don't touch the button, it still count because of noise. I then made a filter, but every time i start the program, I get "Error -20023"
Please look my program attached to this post, and help me fixing the problem
Thanks
Attachments:
Collect Signals.vi ‏157 KB

You are still trying to filter a single point and the filter you are using expects multiple points - you could perhaps store the points using your 'collector' and filter the result from them.
Also, I assume you are switching between 0 and +5V? If this is the case why don't you set you switch level to a more appropriate level, perhaps some in the middle of the range (say 2.5V). If you still get unwanted switching due to noise add some hysteresis as I previously mentioned (have different on and off levels for example "low" when between 0 V and 0.8 V and "high" when between 2.2 V and 5 V) - this might be a more appropriate solution than filtering.
If there is anything that you are still unsure of then ask and I can try to give you answers or recommend solutions but I am not going to do the work for you.
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www.controlsoftwaresolutions.com

Cellular modem is not recognised by Leopard

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Samplerate problem using Analog In and Counter In from a NI 6259 USB. "Counter timeout" setting in DAQmx?!

Hello,
I got a fundamental problem with the correlation of the timer settings of the DAQmx driver in DIAdem DAQ. I dont know where the problem is located exactly but maybe someone can help me if I explain what happens:
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Attachments:
probs.png ‏112 KB

Hi there,
it seems that german is your mothertongue, so I'll reply on german.
Digitale Eingänge müssen Software getaktet werden, da nur analoge Eingänge Hardware-Takt Unterstützung haben!
Sie können den Hardware-Takt nur mit analogen Eingängen einsetzen, die, von einem Timer gesteuert, gepuffert Werte einlesen können. Digitale Größen verarbeitet der Hardware-Takt nicht.
Mit dem Hardware-Takt erreichen Sie sehr hohe Abtastraten. DIAdem überträgt die gewünschte Rate und die Kanalliste auf die Karte und startet die Messung. Die Hardware erfasst die Daten selbstständig und sammelt die Daten. Der PC ist nur für den Abtransport und die Weiterverarbeitung verantwortlich.[...]
Da digitale Signale nicht im Hardware-Takt erfasst werden können, müssen diese Signale parallel in Software-Takten ermittelt werden. Dies kann zu zeitlichen Verschiebungen führen, weil sowohl beim Start der Messung als auch während der Messung keine Synchronisierung der Timer im PC und im Messgerät erfolgen kann. Da zwei Timer nie ganz genau gleichzeitig gestartet werden und auch nie ganz genau gleich schnell laufen, stimmen die Zeiten in den Zeitkanälen nach der Messung nicht genau überein. Üblicherweise betragen die Abweichungen einige Millisekunden.[...]
Weiters hab ich mal n Versuchsaufbau für die Frequenzmessung gemacht. Ich konnte problemlos Frequenzen messen...
Am besten du schilderst kurz den Aufbau deiner Messung, was du messen möchtest und wie du den Max konfiguriert hast.
Mfg Markus

Using timer/counter with PCI-6221/USB-6210 to control timed-loop VI

Dear all,
I need to ask about two devices and one of their functionalities, PCI-6221 and USB-6210. For our NI-based system, we need to control some timings in a Timed-Loop vi, for that currently we are using PCI-6221 and we give external TTL signal (at 1 kHz) to it,
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Also... What if we use the RTOS, are they still able to control the timed-loop VI without giving any 'EXTERNAL CLOCK' and using the internal clock sources of the DAQs
Waiting for reply,
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RaJaf
Solved!
Go to Solution.

Ben,
I having read previous email which I send earlier with general overview, we discussed in more detail within our team and I am giviing the specific answers.
Please check in RED the most recent answers. Blue are the questions/suggestions by your side.
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What kind of application are you intending for this system? ---- high-speed laser scanning system.
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How can i get the every rising edge's time value with usb 6212 counter continues acquisition

i have a usb 6212,and now i can get every pluse 'period ，frequency。
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As you already know YouTube doesn't play in the background, that's why I wasted my time trying to give you an alternative.

USB 8451 no timer / counter ?

Hi all,
i´m not sure if i´m in the right topic now, but i found no answer with the search function.
I tried to generate an digital pulse using timer/counter functions with Labview 8.5 and an USB 8451, but it didn´t work.
Is it possible that the USB 8451 doesn´t support timer / counter signals?
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Hi AK2DM,
thanks for catching this one. I missed the important piece of information that the original poster would like to generate pulses. We have a KB-entry for this. You could also generate software-timed pulses with the 8451. The jitter (timing deviation), as you mentioned, could be a problem. The same issue arises with the 6501 I mentioned!
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If you have further questions, don't hesitate to ask.
Best regards,
Peter
Peter A.
Field Sales Engineer, NI Germany

USB-6211 - Getting Error 50103 when attempting to use two counter method

I am using a USB-6211 and want to measure the speed of a motor by counting pulses coming back from sensors on the motor. Speed will vary from 0 to about 5k Hz.
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To get the pulse generator going at 8,333 Hz I do this:
AGniDAQmx_CreateTask(instrHandle,"TimingPulses, Task_Handle8)
AGniDAQmx_CreateCOPulseChanFreq(instrHandle, Task_Handle8,"Dev1/Ctr0","Out",DAQmx_Val_Hz,0,8.333,0.5)
AGniDAQmx_CfgImplicitTiming(instHandle, Task_Handle8, DAQmx_ValContStamps,1000)
AGniDAQmx_StartTask(instrHandle, Task_Handle8)
This works fine. (By the way, I do stop and clear the task before exiting.)
Now I add this code in a new task to try to use the Counter0 pulses to measure the input pulses with Counter1.
AGniDAQmx_CreateTask(instrHandle,"MotorPulses, Task_Handle5)
AGniDAQmx_CreateCIFreqChan(instrHandle,Task_Handle5,"Dev/ctr1",MotorPulses,0,10k,DAQmx_Val_Hz,DAQmx_Val_Rising,DAQmx_ValHighFreq2Ctr,0.12,10,"")
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This function fails on the CreateCIFreqChan() call with an DAQMXError 50103.
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Hi Mallori,
Thanks for the great reply message. I do appreciate your help.
Yes, I think you understand my application. The motor can turn from zero to about 5K RPM and one pulse is generated with each turn of the motor.
This application is using Agilent VEE but the statements are "C-like" so that's why I posted them like that. I can't "cut-and-paste" directly from the VEE statements and I have to type them.  I mis-typed the Implicit Timing statement. It was missing an "_". It should have been:
AGniDAQmx_CfgImplicitTiming(instrHandle,Task_Handle8,DAQmx_Val_ContStamps,1000)
I think I understand what you are saying about DAQmx_Val_HighFreq2Ctr using the resources from both counters That explains why I get the message about resources not being available.
I have tried to use Counter Method 1 and it *almost* worked.  A problem comes about when the motor speed is zero (stopped) and, since these motor pulses are being fed into the Gate of the counter, the zero value makes it simply time out. Increasing the timeout value to infinite (-1) makes the entire program hang. I need it to go on -- looking for other user input, reporting other data being collected, etc. If the counter is waiting for the Gate signal to rise to start counting and to drop to stop counting and do the calculation, it will not work since it just times out.  I went to this counter method (actually called counter method 3 in the DAQ manual) because then I am trying to generate the pulses of known period and send these pulses to the Gate.  Then I am feeding my pulses into the Source of the counter and letting it determine how many pulses occured during the "gate time". In this case, zero pulses during the "gate time" should be OK; it should simply report that zero pulses were detected and start counting again on the next rise of the Gate pulse.  I thought I could simpy adjust the length the "gate time" to measure my range of frequencies.
Make sense? Any way to do this with the two counters of the USB-6211?
Thanks, Mallori,
-Craig

USB 6210 Using counter as an external clock

I was referencing an old post for how to read and write data from a quadrature encoder. I am using a USB 6210 card along with Labview 8.2.1. In the previous post it describes needing to:
"You will have to create an external clock using the other counter on
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I do not know what this means and I do not understand what is required to do such (Changes to wires, change the Vi...etc). If someone could please shed some light on this I would really appreciate it.
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Hi rose8,
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In software, you specify two counter tasks; one to measure your angular position and one to generate a pulse train. The pulse train you generate will be the sample clock for the buffered angular position measurements you are taking. Now, you can route this externally or internally, based on your application. The easiest way is internally, because it doesn't require any additional wires to accomplish.
To route internally, all you have to do is for your DAQmx Timing VI, specify CtrXInternalOutput from your USB 6210 as the source, where X is the counter you generate your pulse train on. To see this source as an available selection, right click your Resource Name and select I/O Name Filtering from the shortcut menu, and then be sure that Include Advanced Terminals is checked.
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National Instruments
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Buffered event counting: migration from E/M series to NI-USB 6210

Hello,
I create a project developed in LabWindows CVI that does buffered event counting.
The project ran on E/M series for a year. Now I have to migrate to NIDAQ-USB and precisely NI-USB-6210 (that is a M-series). The problem concerns reading acquired samples. The buffered event counting that I need is performed in this way:
1) Start a buffered event counting task
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This procedure works fine on E/M series on PCI bus, but it does not work with NI-USB. With NI-USB, the number of samples is always 0. I link a project that demonstrates that (the "after n seconds" clause is simulated by pressing "stop" key).
After many tries, I saw that the problem is in reading number of samples and so I modified the sequence of operation in this way:
1) Start a buffered event counting task
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After some houndreds of attempts, the number of samples moves from 0 to the correct number of samples...It seems a bad working....And I don't know after how many attempts I can surely assert that no samples effectively "crossed" card input....
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Attachments:
Provausb.zip ‏463 KB

Hello Luca,
I changed the code a bit and I found something interesting about your situation; in the attached VI there is your CVI project modified as follows:
After the Stop button hes been pressed, and the corresponding callback function is called, we read the acquired samples two times: the first one we ask for 1 sample only. This allows to avoid the USB transfer mechanism issue and then, with the second read function it is possible to get all the remaining samples acquired (selecting -1 as "number of samples to read");
Hope this helps you,
Best regards
Fabio Mussi
P.S. A SR request about this problem has been opened too. If you need more information, call me at 02-41309217;
Fabio M.
National Instruments
Embedded & OEM Systems Engineer
Attachments:
Provausb_modified_2.zip ‏471 KB

NI USB-6215をC++ Builder 2010で使用する方法

今回、NI USB-6215を使用してデータ集録を行います。
作成するソフトウェアですが、C++ Builder 2010での作成となります。
NI-DAQmx 8.9.5をインストールし、サンプルプログラムを作成したのですが、
以下のようなエラーメッセージが出ました。
[ILINK32 エラー] Error: 'C:\PROGRAM FILES\NATIONAL INSTRUMENTS\SHARED\EXTERNALCOMPILERSUPPORT\LIB32\MSVC\NIDAQMX.LIB' には無効な OMF レコード (タイプ 0x21) が含まれています (COFF の可能性もあります)
他のディスカッションで、C++ Builder用のインポートライブラリを作成すればよいような記載があります。
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（C:\Program Files\National Instruments　以下）
また、NIDAQmx.libをリンクすればよいのかと考えたのですが、上記エラーが出ました。
今回、初めて御社製品を使用します。
インストール方法、その他、何か足りない、もしくは間違えていることがあるのでしょうか？
何かわかることがありましたら、指摘していただきたいです。
よろしくお願いいたします。

お世話になります。
自己フォローです。
本件ですが、NIDAQmx.libを含むDLLをVisual C++で作成し、それをimplibでインポートライブラリを作成することで対応できそうです。
お騒がせしました。

Ni 6215-USB counter

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