Simultaneously generate a pulse with each AO iteration

Dear Filipe :
Would you please take a look at the comment of the question "Synchronize counter and 2AO boards"
I don't know whether you have read it.
Is it possible to generate a pulse train instead??
Thanks!!

Dear Filipe:
I attach a Word file,and I describe my problem in it.
Thanks!!
Attachments:
Generate_a_delayed_pulse_with_AO_boards.doc ‏25 KB

Similar Messages

Generating a delayed pulse with each AO iteration

Hello Filipe:
I attach a Word file,and I describe my problem in it.
Thanks!!"
Attachments:
Generate_a_delayed_pulse_with_AO_boards.doc ‏25 KB

Hello;
Thanks for the clarification. What you need is a retriggerable delayed pulse. I'm attaching an example VI which does retriggerable pulse generation. You will need to adapt this code to your needs.
Hope this helps.
Filipe

How do I generate a pulse with a user specified puse duration, down time and repitition, and then out put to a graph?

How do I generate a pulse with a user specified puse duration, down time and repitition, and then out put to a graph and then to daq ports?
I used lab view in engineering class, but that was the extent of my usage and after fiddling around in lab view and looking on the web looking for solution, I could not produce desired results. My professor wants me to produce something that will output a pulse for a specified duration, then downtime for another specified duration and then repeat the process a specified amount of times.
I am using labview version 7.1
Thanks in advance.

Hello,
Are you using hardware (DAQ card) to generate this pulse or are you planning on doing this all in software. If you have a DAQ card in LabVIEW you can go to Help » Find Examples and then select Hardware Input and Output » DAQmx » Generating Digital Pulses » Gen Dig Pulse Train-Finite.vi. This will use a counter from your DAQ card to generate a finite number of pulses at a specified frequency and duty cycle. Give this a try, or let me know if you are not using hardware, and we can figure something else out.
Regards,

How to generate a pulse with 9472?

I am trying to generate a single 8V pulse of 10ms duration on multiple channels of the 9472. The 9472 is in slot 4 of the 9172 compact daq chassis. To test my results, I have connected an oscilloscope to one channel of the 9472 (with no load attached). I tried modifying the Create Digital Waveform VI from the Write Dig Chan-Ext Clk example VI. In doing so, I generated a binary array with the first half of the array filled with all 0's and the second half of the array filled with all 1's. When I triggered my O'scope on a rising edge, I saw the channel turn on (also the LED was lit on the 9472). However, the channel stayed on even after the routine had completed (LEDs were lit solid). So to try to turn the channel off, I appended one 0 to the end of my array. Now the O'scope won't trigger and I see no sign of the LEDs on the 9472 blinking. Any ideas how I can solve this problem?
I was able to get a single pulse of the proper duration by setting up a task in MAX with the 9472 in slot 5. But in doing so, I was only able to generate the pulse on one channel. I need to be able to parallel multiple channels for my application.

I am trying to generate a single 8V pulse of 10ms duration on multiple channels of the 9472. The 9472 is in slot 4 of the 9172 compact daq chassis. To test my results, I have connected an oscilloscope to one channel of the 9472 (with no load attached). I tried modifying the Create Digital Waveform VI from the Write Dig Chan-Ext Clk example VI. In doing so, I generated a binary array with the first half of the array filled with all 0's and the second half of the array filled with all 1's. When I triggered my O'scope on a rising edge, I saw the channel turn on (also the LED was lit on the 9472). However, the channel stayed on even after the routine had completed (LEDs were lit solid). So to try to turn the channel off, I appended one 0 to the end of my array. Now the O'scope won't trigger and I see no sign of the LEDs on the 9472 blinking. Any ideas how I can solve this problem?
I was able to get a single pulse of the proper duration by setting up a task in MAX with the 9472 in slot 5. But in doing so, I was only able to generate the pulse on one channel. I need to be able to parallel multiple channels for my application.

OCI bowser generates new session with each page load

Here is a summary of my problem:
I am trying to implement the SAP Open Catalog Interface (OCI) with our eCommerce software, but I am having issues with the Web browser that OCI uses.
Our eCommerce software utilizes the browser session id to identify the user. Our issues is that the OCI browser supplies a new session id with each page load.
The weird part is that if I open a standard instance of IE, access the site, and then access the site though OCI the same session is shared by both the OCI browser and the IE browser. The OCI browser is now able to maintain the session ID as the user browses the site.
Thanks.

Thank you for your quick response.
I understand that session IDs are always unique, and should only last for as long as the instance of the browser is open.
What I have seen happen is that the session ID will get recreated with each page load with in a single instance of the OCI browser.
When the site is opened in OCI it logs the user in, and then redirects them to the homepage. The problem is that the load of the login page, and the load of the homepage have different session IDs. If the user then clicks on a link on the homepage that page load will again have a different page load. This causes the eCommerce system to see them as separate users.
As I described when I open an instance of IE first it seems to work. This leads me to believe that the OCI browser can read the cookie information, but can't write or create.
I am trying to figure out why the OCI browser keeps generating new Session IDs.

Generate single pulse with DAQ card

Hi
I was trying to use a VI found on the NI site "generate single
pulse "DAQ-STC" but another VI is requested in order to run;
that's "set pulse specs.vi". Someone knows where to find it?
thanks for all
bye
-Claudio
Claudio Vinegoni
URL: http://www.gapoptique.unige.ch/members/vinegoni/default.htm
GAP-Optique Phone: +41 (0)22 7026158 (lab)
University of Geneva : +41 (0)22 7026082 (office)
Fax: +41 (0)22 7810980
20, Rue de l'Ecole de Medecine Email: [email protected]
CH-1211 Geneva
SWITZERLAND
Sent via Deja.com
http://www.deja.com/

As of NI-DAQ 6.9, you could find the Set Pulse Specs.vi in LabVIEW/vi.lib/daq/zadvctr.llb.
Erin
Claudio Vinegoni wrote:
>>>Hi>I was trying to use a VI found on the NI site "generate single>pulse
"DAQ-STC" but another VI is requested in order to run;>that's "set pulse
specs.vi". Someone knows where to find it?>thanks for all>bye>
-Claudio>-->************************************************************************>Claudio
Vinegoni>>URL: http://www.gapoptique.unige.ch/members/vinegoni/default.htm>>GAP-Optique
Phone: +41 (0)22 7026158 (lab)>University of Geneva
: +41 (0)22 7026082 (office)> Fax: +41 (0)22 7810980>20,
Rue de l'Ecole de Medecine Email: [email protected]>CH-1211 Geneva>
SWITZERLAND>>****************>>>Sent
via Deja.com>http://www.deja.com/

Generate a delayed pulse with analog trigger

I want to generate a pulse with counter when the gate of counter receives a voltage value which is generated by analog output chanel,is this possible??
I am using PCI-6713
Thanks!!

You can generate a triggered pulse in a counter by sending a signal to the gate from the Analog output, as long as such analog output meets the operational contitions of the counter of the PCI-6713. Just make sure that the signal does not exceed 5V. The trigger on the gate pin will be taken as low from 0 to 0.8V and as high from 2 to 5V.
Thanks for contacting National Instruments!

Generating Pulses with CTR-502

Hi,
I want to generate 100 Pulses with a frequency of 0.27Hz. After having done no other pulses should be generate until told so.
How can I do that? I'm using an CTR-502 and LabView 7.1.
Any help would be great. I read most of the documentation but either my english is to bad or I couldn't find any solution.
Yves

Hello Yves.
Sorry for me currently not having a CTR-502 at my hands.
Therefore I had to do some "copy and paste" from a project that I worked on in the late 2003.
I hope this VI is a helpful startup - although I could not test it before posting it to you (as already said: I don't have a CTR-502).
The VI is small, configurable and uses low CPU resources.
On a RT target like FieldPoint (FP) or compactFP this VI should typically run at least with "high priority".
I hope this will help in getting your job done.
BR, mgm
Attachments:
constant Frequency with FP-DigOUT.zip ‏17 KB

Generate pulse with NI-6024

Hi,
can I generate defined pulses with the NI-6024 Card? I'd like to generate 100 Pulses with 0.27 Hz frequency.
I'm using LabView 7.1
Yves

You can add the attached vi between the 'Frequency control and the DAQmx function in 'Gen Dig Pulse Train-Finite.vi' in the examples. This will change the frequency slightly to one that will work. You can add a local variable for the 'frequency' control to see what it changed to. You have have to increase the number of visible decimal places to see the change.
Randall Pursley
Attachments:
Set Frequency.vi ‏14 KB

Generate a pulse train using a count from a quadrature encoder as the clock

I am trying to generate a pulse train with the same frequency as my quadrature encoder. Every time the encoder counts, I want the pulse to go high until the next count and then go low and so on. I am using a 6602 PCI card and a BNC 2121 accessory.

Maybe I'm not understanding your app, but I *think* you and I are approaching it from two very different directions.
As I understand it, you'd like to emit a pulse with each quad state change. Then that pulse would act as a counter Source signal. The counter will then increment on each pulse, to keep track of accumulated position. Further, you'd use your device-under-test (DUT) as a counter Gate signal, which would buffer the position count each time there's a rising edge on your DUT. The end result is a buffer of position values, captured at each rising edge of your DUT.
I'm talking about a different approach to produce the same data. You'd use 2 tasks on a M-series board. One of them is a hardware-timed digital input task based on "change detection." Each time one of the specified bits has a transition, your whole set of digital input bits can be captured and an internal "change detect pulse" is generated on the board. This task should be sensitive to the DUT edges.
The other task would be a buffered position measurement. It would receive the reference encoder inputs and internally do quad decode and keep a running count. The sampling clock for this task would be specified as the other task's "change detect pulse."
Net result: on each specified edge of your DUT, you'll buffer a reference encoder position value and a digital state of your DUT. You can choose to be sensitive to rising edges, falling edges, or (!!!!) both at once. You can also choose to be sensitive to many bits simultaneously. These are better capabilities than you get with the 6602 alone.
I *think* the 6220 should be ok, based on a quick overview of specs. I assume your 3.6 MHz is the rate of ref encoder quad state changes, right? In the approach I'm suggesting, you only need concern yourself with the rate of DUT edges which appear to be in the 10's of kHz or less.
Gotta go for now. Post back if any further questions.
-Kevin P.

How to generate a pulse on x number of events PCI-6602

I am running LabVIEW 5.1 full development with a PCI-6602 counter board.
I would like to generate an output pulse after counting x number of input pulses. I would also like to reset the counter with an external signal.
My application is I am trying to generate a second index pulse for an encoder.
I would like to count the pulses from encoder phase A and generate an output pulse on x number of counts. Then I would like to reset the counter using the encoder’s index pulse. This way I can change the phase of the “generated” index pulse with respect to the “real” index pulse by x number of counts (degrees) and maintain that regardless of encoder rpm.
Thanks
Brian

Brian,
There actually is a way to do what you want, but it gets a little complicated. I don't have LV on this machine so I'll have to just describe the idea. First a summary: the counter will repeatedly countdown to 0. Each time it reaches 0, it will generate a brief pulse which will in turn hw-reset the counter value to N. Then it will countdown to 0 again, etc. The same brief pulse could also be wired to a different encoder-measuring counter to create a "delayed" reset to 0 (or some other #).
1. Configure your counter for "position measurement" instead of "simple event counting". Set the encoder type to, um, I forget the name -- something like "two pulse encoder." It's the setting that will increment with every SOURCE edge and decrement with every AUX edge. Wire your encoder channel A to the counter's default AUX input (in position encoder mode, you must use the default input pins). Hard wire from the default SOURCE input to GND. Now every encoder edge will decrement the count, and nothing wlil ever increment it.
2. Configure the counter to use z-indexing. Set the z-index reload value to be N-1, where N is the # of encoder counts by which to delay the encoder's real z-index pulse. Set the z-index reload phase appropriately, probably to A low B low. Wire the real z-index pulse to the counter's GATE input.
3. Configure the counter to "pulse on terminal count" -- you do this using 'Counter Set Attribute.vi'. So N encoder edges after the real z-index pulse, you'll generate a pseudo-z-index with this counter.
4. You can wire this pseudo-z-index to the GATE input of the encoder-measuring counter. Now the encoder's z-index pulse is delayed by an amount you can program.
5. Note: this method requires the motion to be uni-directional.
Good luck!
-Kevin P.

How to generate a pulse train with different pulse width and delay?

How to generate a triggered pulse train with different pulse width. for example, after each trigger signal, let's say 2 ms, then the counter output a pulse with pulsewidth of 1 ms, and then after 3 ms delay after the first pulse, the second pulse was generated with a pulse width of 4 ms. Next cycle when the trigger signal comes, the same two pulses will be generated and so on. Is it possible to achieve this by using 6601 counter card? and if yes, how to achieve this? Thanks!

Unfortunately you can not create a hardware timed pulse train with different widths on each pulse from a counter. Whilst it can be changed on the fly using software, since you require a hardware triggered signal getting the software involved will not give a huge amount of accuracy when the pulse will actually change.
So in short you can't use your 6601 card (or a counter timer) to achieve this
There are three possible Alternative solutions
1 You could use a high speed digital IO device such as the (6533/34) to generate your variable signal which would require setting up the pulse train as a series of states based around the burst transmission mode where the clock would give you your specific timing.
2 A timed analogy output (for example on a MIO card with a clock (PCI-6220 / 62xx), i.e. Not the 6704 style static analogy output cards)
3 A high speed digital waveform card such as the (, 656x , 655x, 654x, 6534, 6533 (http://www.ni.com/modularinstruments/find_right.htm) ) this could then be scripted to work with your triggering and also there is a digital waveform editor which will enable you to set up the pattern you wish to generate (http://sine.ni.com/nips/cds/view/p/lang/en/nid/13555)
Hope that helps
Tim Matthews
NI (UK)

How to generate a pulse waveform 90 deg phas shifted with respect to a pulse generated using a counter in PXI 6070E daq card ?

Hi
I ma using 6070E daq. I am generating a infinite pulse train using one of the counters. I want to generate another pulse train which should 90 degress phase shifted with respect to the previsously generated pulse. How to implement this using the counters in the DAQ card.

Hi Gopal,
1) yes the frequency generator is programmable. You have 2 timbebases (10MHz and 100kHz) and you can divide down by any integer between 1-16. Those are the only frequencies you can use.
2) The way counters work is that you can apply a gate signal to the counter which will cutoff the output. Therefore, you can have a second counter generating a pulse train of an equivalent frequency to the frequency generator (fout) but you don't want it to start immediately. You want it to start only after a short delay (equivalent to a 90d phase). Therefore, you need to "gate" or prevent the output on this counter for that small delay period of time. The way you can do this is by using a second counter to create a delayed pulse. You would
connect the output of that counter to the gate of your pulse train function. That way, during the delay period of the pulse, you won't be outputing your pulse train yet. When the pulse (high-time) of your pulse reaches the gate, then your pulse train will start generating its pulse train (which is consequently delayed by the amount of delay used in the single delayed pulse counter). Since you don't want your pulse to go back low, you will have to turn off or clear your pulse counter while it is high. That way the signal on the gate will remain high forever.
Your better solution is to use a PCI-660x card to perform this action. You will have more counters which will give you a greater range of frequencies to choose from and you will have more accurate timing of the signals.
Anyway, hope that clears things up. Have a good day.
Ron

Trying to trigger multiple analog measurements with each pulse of a 500PPR encoder

I am trying to take multiple analog measurements form 6 sensors with each pulse of a 500 ppr encoder and write these to a file. Problem I have run into is I am not getting 500 readings with 1 revolution of the encoder the most I have received is 187 however this isnt consistant.
using
6024 E Series card
BEI L25G encoder
Still relatively new to labview along with using an older version 7.0
Thank You in advance
Solved!
Go to Solution.
Attachments:
Rotary.vi ‏213 KB

Never mind after looking at it somemore i found i was using the wrong sample rate

How can we generate a pulse train with variable inster pulse delays?

I want to generate a pulse train with random inter pulse delays (100us-10000us) and the pulse width would be 50-100us. I programmed for single pulse generation using counter cfg,a for loop contaning set attribute parameters pulse spec 1 and pulse spec 2. I changed the pulse spec 1 value in every cycle
This program is generating the pulses but not the exact values in the sense the some times the delays are more than 10 msec. As per the program the delay should be maximum 10 msec. please help me ASAP.
thanks
thota

Hey Thota,
I would suggest to take a look at the example program linked below. It shows how to change pulse specs on the fly. You have to be make sure you are ignoring a certain error when doing this.
Pulse Train Generation with Changing Pulse Specs (PWM)
http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E21756A4E034080020E74861&p_node=DZ52328&p_source=External
I hope this helps.
Regards,
Todd D.
NI Applications Engineer

Simultaneously generate a pulse with each AO iteration

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