Count edges with hardware reset

Hello all,
I have a PCI-6220 and I would like to configure a counter to count edges with a hardware reset or use my counter to measure linear position without the B input, after words, only with the A input to count edges and the Z input to make the initial position.
Somebody knows how?
Thanks in advance, best regards,
Paulo Carmo

Duplicate Post
John Passiak

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Counting edges with dynapar encoder

Hello,
I am very new to Labview. To kick off some experience, I am trying to count edges on a Dynapar encoder, Model E14020000303. Here is the data sheet:
https://ecatalog.dynapar.com/downloads/E14_DS_702489_2_.pdf
I am using LabVIEW 2011, with a NI USB-6210 DAQ. My white wire on the encoder is connected to PFI0. The red and black wires are connected to my 5V voltage source. I am rotating my encoder to count the revolutions. Supposedly my encoder is a 200 PPR, and it is also quadrature.
However, I am not understanding what I am getting when counting edges using DAQ Assistant. I am using the Edge Count on ctr0. I can set the DAQ assistant to run on 1 sample acquisition mode and count the rising edge. When I turn the encoder 100 times, the measured value on the DAQ Assistant is usually around 76500, which would mean 765 edges counted per revolution. I can also change things around and go to continuous acquisition mode. I set up PFI2 as the external clock source with a rising edge and put the green wire in PFI2. I set it to read 1 sample at 1k Hz. This usually results in counting around 820 edges.
I don't understand why I am getting these readings. The DAQ Assistant should only be counting rising edges because that is what it is set at. Why am I getting numbers so high?
Thanks!

Hey guys,
Sorry for the late reply, I have been put on other tasks. You all were right about the ground, that indeed was the problem. With the daq grounded, the encoder measures 200 edges per revolution.
Thanks!

Count edges with 6036e

Hello !
I am currently trying to count photons with a PCMIA 6036e.
I have to detect a TTL signal ; each photon correspond to a pulse. So I tried to count rising edges, since one rising edge = one photon. I want to use either digital line or counter. Moreover, I have to count the rising edges for a limited time (typically 1s).
I have tried several VIs, but none of them work. I either don't have an error message, but only 0 as a result, or an error message saying data were overwritten before they could be read.
The problem does not come from the card, since it can count the rising edges in MAX. I have also tried examples such as "count digital events", but they give me the same error.
I would appreciate any help !
thanks,
Camille

Hello,
Check carefully the wiring of your signal to the DAQ board; there is to main input for counter application, the source and the gate. Depending on the measurement you do, you have to wire your signal to the gate or to the source. In your case, the acquisition type should be a simple event counting. Using CTR0, the input signal should be wired to PFI8 (PFI3 for CTR1).
The specification of the PCMCIA-6036E mention that the minimal pulse duration you can handle is 10ns in edge detect mode. If the pulse you measure are shorter, you will not be able to see it.
Regards,
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Mathieu R.
  CTD - Certified TestStand Developer / Développeur TestStand Certifié
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PCI-6013 intermitant bad counts good after hardware reset

I am using a PCI-6013 board to two edge separation counting into 10 bins over 1 second. Most of the time the counter works great but some of the time I get garbage data eg 0,6050955,6050951,0,6050944,6050954,0,6051007,0,6050951. The counts are coming from a PMT that has a max linear response of 1,000,000 counts per second. Each data point represents 100ms of counting. Powering the PMT off and then on has no effect. After restarting my program the reponse returns to normal until the counts freak out again maybe 20 minutes later. Does any one have any ideas why this is happening?

What two signals are your trying to perform a two edge separation measurement on? What do you mean by bins? What language are you doing this in and can you post your code?
Matt
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Timing problem with counting edges

Hello!
I use a NI PCI-6221 DAQ card with NI-DAQmx to count edges of TTL pulses for a spectrometric application.
It is extremely important that I count the pulses for a well-defined period of time. Typically, I want to count the edges that reach the counter in the period of 400 milliseconds.
Normally, this works quite well, when I use a WHILE loop that reads and restarts the counter every 400 milliseconds. Things change when the PC I run the VI on has other programs running in the background. Expecially computing-time intensive programs delay the 400 milliseconds of the WHILE loop for up to several 100 percent, resulting in an wrong counter read.
I tried to use a timed WHILE loop but this din't change anything, regardless of the timimg source (onboard clock or PCI-6221 counter) I applied.
Has anyone encountered similar problems and found a solution? Isn't there a possibility to control the counting time by hardware?
Thanks in advance!
EresthorMessage Edited by Eresthor on 04-07-2005 08:17 AM

Hej Lynn,
of course your idea works, thank you. It works extremely well this way, too.
My problem with this approach is that I need both counters on the PCI-6221 to count data from my spectrometer simultaneously on two channels. That's why I would like to trigger the counter in a different way, for example with a clock.
Is there no way to trigger the counter with the timebase of a hardware clock on the card? Or ist there another possibility without wasting a counter?
Eresthor

Count edges of AI signal with NI 9221

Hi,
I'm trying to count edges of an AI signal that are acquired with an NI-9221 on a cDAQ. The average frequency is about 1kHz.
I'm acquiring the signal with 10kHz but don't get the right amount of edges.
Is
there any solution for this problem. I know, of course it would be
easier to use a CTR-modul but my signals doesn't fit with the specs.
Thanks for any help
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Can i Count digital edges with all three channels on a 9421 cDAQ

Hi!
We have just purchased a Compact DAQ with NI 9203, NI 9217 and a digital card 9421. In the application for which these parts have been purchased I want to measure flow, power, pressure, temperature and water and energy consumption of a sterilizer. I have connected the flowmeters, and pressuremeters to the analog current card 9203, the RTD termomters to the 9217 and three digital pulse outputs from two flowmeters and a poweranalyser to the 9421 card. I have configured the analog inputs on 9203 and 9217 to my satidafction. But now to my question. I want to configure VI to count the digital edges from the three channels in the 9421. I know that the card only has two counters but since my pulses only has a frequency of approximately 1 Hz I believe that i in some way should be possible to count the edges with a regular digital input channel as well.
I know I have signal from all three pulse outputs to the 9421 card, since I have tested this in the Measuremnet & Automation explorer.
Do I need to add an extra DAQ-assistant to be able to acquire the digital signal parallell to the analog signals from the two other cards?
And is it possible to count the edges of mylow frequency on say for example channel di0, di1 and di2 as i wish and not only on di0 and di5 which I think are the counter-channels?
Do i need to put the 9421 card in one particular slot on my cDAQ-station, this I also ask since my pulses frequnency is low and I don´t now if i really need to use the counter on slot 5-6 to count my pulses?
Attachments:
Measurementbench.vi ‏143 KB

Hi Gravy Train,
I'm curious about why you are using 2 loops. You mentioned one is for monitoring and one is for DAQ....what do you mean by that? What is the overall goal of this piece of code. Also, I noticed that you are not closing the task. Since this is just a subset, I realize you could be closing it in your actual code, but just in case you're not.....it is very important that you close all tasks when you are down acquiring data.
Best Regards,
Starla T

IPad unresponsive after iOS 8.02 update, doesn't show up in iTunes, hardware reset (home and standby buttons both held down for ten seconds) not working

I have a 32GB iPad mini that was purchased new in June of this year. A little while ago, I started the iOS 8.02 download while it was plugged into a wall socket using an official apple wall to USB plug and an official apple thunderbolt cable. I then left for 25 minutes to get some food.
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Hi Colin how are you?
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Is it possible to use "Delay Values" to create a frequency signal from digital "Count Edges" -task? (= are the results I'm getting correct?)

Hello.
I have a digital encoder from which I need freaquency information (to ultimately get rpm -infromation). The problem is that this task is inside a loop with 2 other DAQmx -tasks that are using "one sample on demand"-aquisition mode and if I configure this new counter task to be a freaquency task, it only updates once in ~ second which makes the whole loop lag.
I thus created an "artificial" freaquency signal by using "Count Edges" -aquicition mode and the "Delay Values" -block so that I substract the delayed signal from original "Count Edges" -signal. There is a 0,01s delay in the loop and I figured out that if the history of the "Delay Values" -block is 100 samples I would thus get the real edge-freaquency.
I tested this configuration and the results seem to be at least really close to correct but I have no idea if this idea is in any way correct...
This explanation was probably quite confusing so please see the picture attached.
Thanks a lot in advance!
Attachments:
are_the_results_correct.jpg ‏200 KB

First of all, thank you for quick reply. Unfortunately I don't have the acces to the vi. until tomorrow.
And yes, I think you understood correctly: essentially this arragement measures how many edges have been counted during one iteration. This is how I figured out that this could then be used as a frequency measurement:
1. From the "Edges - Delayed Edges" I get the information on how many edges have been counted during last iteration.
2. I "know" (really I don't?) that one iteration lasts ~0,01s because of the delay in the loop.
3. There is 2048 edges in one round of the encoder so I get the rpm as follows: rpm = (edges - delayed edges)/204,8*60(s)
(If I was using history size of one as you suggested it would be: rpm = (edges-delayed edges)/2048 * 60) However using history size of 10 and taking it account in the multiplication smoothens the response nicely.
But doesn't this arragement count on the fact that the vi runs smoothly and there is no additional lag?
I quess using another loop and notifiers for a dedicated freaquency measurement as you suggested could be worth trying. I just have to first learn how to use them.
If I do use them will the main loop run smoothly and not wait for every update of the notifier? This would be essential since the freaquency output refresses only about once in a second if I use the continious aquisition mode.
Attachments:
are_the_results_correct.jpg ‏198 KB

Problems with hardware acceleration

Hallo
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http://www.youtube.com/watch?v=QrXJCcWV2Sk
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I got my laptop with replaced systemboard today.
Unfortunately the problem is still present. In the meantime there was Flash update released (10.2.159.1 for IE) so I also tried to install newest version - but it didn't help.
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Highest DPC routine execution time (µs): 60999
Responsible driver:                       nvlddmkm.sys (NVIDIA Windows Kernel Mode Driver, Version 267.76 , NVIDIA Corporation)
DPC count (execution time <500 µs):       1307911
DPC count (execution time 500-999 µs):    0
DPC count (execution time 1000-1999 µs): 0
DPC count (execution time 2000-3999 µs): 0
DPC count (execution time >=4000 µs):     11
Highest ISR routine execution time (µs): 853
Responsible driver:                       dxgkrnl.sys (DirectX Graphics Kernel, Microsoft Corporation)
ISR count (execution time <250 µs):       2516652
ISR count (execution time 250-499 µs):    0
ISR count (execution time 500-999 µs):    29
ISR count (execution time 1000-1999 µs): 0
ISR count (execution time >=2000 µs):     0
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Hard pagefault count (total):             22908
Number of processes hit:                  17
Pagefault count of hardest hit process:   17072
Process with highest pagefault count:     devenv.exe (PID: 5144, Microsoft Visual Studio 2010, Microsoft Corporation)
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Flash player hanging with hardware acceleration enabled

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I suspect the problem is either the Flash player or the machine's graphics driver. I'm running Flash Player WIN 10,1,53,64 under Windows 7 64 on an Intel Core i5 machine with Intel GMA HD graphics, driver version 8.15.10.2025.
BTW, is there anyway to permanently disable Flash's use of hardware acceleration? (if I disable, the setting doesn't seem to want to stay)

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Graphics Driver
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Count edges on rtsi0

Hi all,
I have a PCI 7831-R and a PCI 6143 card running on my computer. Both
are synchronized with a RTSi cable. The PCI7831 delivers via RTSI 0 a
clock signal for Trigger my analog signals. My problem is now that i
want count the edges on rtsi0 because I want to know what the
values of my analog signal are refered to my triggersignal. For
example, Trigger edge 1 - analog value x, trigger
edge 2 - analog value x. Is that possible. I don't found nothing
on ni examples. Thank you for your help.
Grüße aus Deutschland
Manuel

Manuel,
you want to count edges from a RTSI line with the PCI 6143, right?
Have a look on the following post:
http://forums.ni.com/ni/board/message?board.id=250&message.id=4715&requireLogin=False
Regards,
ThSa
Message Edited by ThSa on 04-05-2006 09:42 AM
http://www.newgistics.com

Setting output pin to high while counter counts edges - 660x

Traditional DAQ allowed you to set the output of a counter while it counted, is there an equivalent for daqmx? The counter output for our current setup spins a motor until the counter reaches the proper number of counted edges from another pulse generator on the board. Perhaps I need to reconsider the setup, but there should be a method to do this action. I was only able to find an indicator of the output state in the Channel property nodes. Any ideas? Thanks.

Hello Roth,
An event is thrown whenever a counter reaches its terminal count, and you should be able to use that to your advantage here. Once that terminal count is reached, you can use DAQmx properties to set the counter to output a pulse or toggle the line. If you use this property in conjunction with the initial count property, you can have the counter cound X number of edges and then toggle the output line:
I hope this helps!
Thanks,
Justin M.
National Instruments
Message Edited by Justin M. on 06-12-2006 01:05 PM
Attachments:
Terminal Count Toggle.JPG ‏11 KB

Alazar count edges synchronization

Hello,
We have an Alazar AT9350 of which the acquisition has to be synchronised with the acquisition of a Count-Edges channel on an NI-6259 DAQ board. Running them synchronously is easy, for we run the Alazar board with a trigger signal (50KHz) that we can route to the NI board as well. However, starting them synchronously poses more of a challenge. The original solution was to input the trigger on the NI-board and reroute it when the count edges VI starts. However, the board needs one counter to create the sample clock (or receive the trigger signal), and one counter to output the signal. This leaves no counter for the Count-Edges channel (our NI board has only two counters).
I have come up with a possible solution for synchronisation, but it is a bit ugly. I output the task just after the start task VI to an indicator, and create a local variable. I connect a read version of the local variable to the acquisition while loop of my alazar board. My assumption: because the while loop has to wait till all data flows have presented data to him, the while loop must start synchronously with the start task. The actual program is much bigger, that's why I'm using a local variable here. A direct wire is also possible, but it would look even uglier.
I have put a snapshot of a simplified version of my program as an attachment. I realise I am not actually saving any data or outputting what the Count-Edges reads, of course this is different in my real version.
Is my method viable or should I use a different method? (or perhaps it is viable, but I should still use a different method).
Solved!
Go to Solution.
Attachments:
labview program.JPG ‏114 KB

Dear GerdW,
Thanks for your suggestions.
[quote]Probably not "real time"… When you use DAQmx to read your input data you can synchronize input channels. Have you looked in the example VIs for that case? [\quote] I use an NI board with DAQmx drivers to acquire the Count Edges. I use an Alazar board with their own SubVI's for the other acquisition. Therefore I cannot use the DAQmx synchronisation (which would've been quite easy indeed). And indeed, by "real-time", I of course mean that the amount of data I process per second is the same as the amount of data that I acquire per second .
I changed my example, hope I finally understood you well. I added a wait function to the loop that sends the notification. Otherwise the notification is sent on the same time, but there is still no synchronisation because the notifier is retrieved upon reaching the loop (and it essentially does nothing). To make sure I know when I start the two loops synchronously, I will add a high-resolution relative seconds to both loops and subtract them in another loop. If there is a better way to test synchronisation I'd happily take any suggestions. (Though perfect synchronisation is the best, one or two ticks off won't do much harm).
Attachments:
MinimalExampleWhileLoopSynchronisation.PNG ‏14 KB

Count edges with hardware reset

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