Generate delayed pulse example VI for NI-TIO 6602

Is there an example VI for generating a delayed pulse for the NI-TIO 6602?
I found a VI for the NI-STC that has everything I need but it doesn’t work with the 6602 board.
I would like to set the output pulse delay and width using the counter’s source (number of pulses).
Thanks
Brian

Thanks Tom
That pointed me in the right direction.
Brian

Similar Messages

Generating two pulse trains with on a PCI 6602 (2 CWPulse)

I am writing an application that should generate 2 pluse trains. I'am using ComponentWorks 3. I've tried to use 2 CWPulse but after configuring the 1st, i cannot start the other one because "too many controns are configured for this DAQ device".
Do you know how to use 2 CWPulse with a 6602 device ?

Dear Sir,
If you need to use two CWPulse components you will not be able to set a finite number of pulses to be generated. When you set the component to produce a finite number of pulses, it actually uses two counters to perform the operation. One is used to generate the pulses and the other one is used to count the pulses that are generated. You can use multiple CWPulse components as long as the pulse type is set to continuous on both components.

How to get delayed pulse train

hello,
i am using Labview 7 and a PCI 6014 interface card. i want to generate delayed pulse train. for this purpose i am generating a analog waveform using 'function generator.vi'. i supply this waveform to a counter and to generate delay i am using 'finite pulse train(daq-stc).vi'. when i set trigger mode to 'no trigger', the VI works fine. But if i supply generated waveform to the counter gate(i.e. setting trigger mode to external), i see for sometime pulses missing are missing. I have also tried several other VI's(like 'delayed pulse easy.vi' and 'cont pulse train easy.vi'), but facing same problem. Can you please tell me how can i solve this problem.
regards,
Abhijeet

hello Alan,
Ok! here i explain my code. My requirement is to supply contineous 5V pulses at around 10Hz to a camera. After some time of the rising edge of pulse to the camera, i want to trigger Laser-1 and after some time of rising edge of the pulse to the Laser-1, i want to trigger Laser-2. In PCI 6014 there are only two counters which i am using for two Lasers(for delay generation). For Pulse train generation i am using 'function generator.vi'which is basically a waveform generator, but to get pulse train i set offset equal to amplitude. I supply this pulse train to two counters. To generate delay from the counters i am using 'Delayed pulse easy(9513).vi' which i have put into while loop. To see the output i am using 2-channel oscilloscope vi where i see some pulses missing. Also I obsereved pulses missing when i supply the output to the Lasers(Lasers stops firing for moment).
I am attaching a timing diagram which is explains my application and a labview code where i have combined three VIs (one 'function generator.vi' and two 'delayed pulse easy(9513).vi').
Thank you,
Abhijeet
Attachments:
camera+laser1+laser2.vi ‏188 KB

How to use multiple counters in the 6602 to measure cycle length, calculate delay and generate triggered pulse.

Hi,
I need to measure the cycle length of a pulse, calculate a delay based on this value, and then generate a triggered pulse with that delay value. The input and output pulses will be continuous. The best case would be to use the cycle length from one pulse in the calculated delay for the next pulse. One of my biggest problems has been getting the calculated delay value into the pulse specs.vi for the triggered output.
This output pulse will be used to trigger an IMAQ video acquisition; therefore, the solution to this problem will be part of a larger video acquisition application. This has posed a problem, in that accessing the counters has interfe
red with the triggered video acquisition.
Any suggestion will be welcome.
Thanks
Dave

Filipe,
The overhead is the problem I'm trying to get around.
Specifically, what I need to do is to generate an output pulse after a trigger pulse, which is a given percentage of the cycle length. The input pulse is from heart rate, so it will have some variance, and the output pulse will be at a stationary point in the cardiac cycle. For example, for an input pulse of 2 Hz (500 ms) the user would likely request the output pulse be delayed by 75%. Therefore, the generated pulse will have a 375ms delay after the trigger.
In the past I have had hardware built to do this, but I am hoping I can accomplish the same thing with multiple counters on the 6602. I have been able to accomplish this with 3 counters (2 to measure period and 1 for output
) but the overhead prevents adequate triggering of the IMAQ video acquisition. I am hoping another method would solve this problem.
Thanks
Dave

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

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

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!

In Delayed Pulse Generation vi,Problem With THE PULSE WIDTH??

In Delayed Pulse Generation vi, I want to input a very low number for the Pulse Width while using an external timebase source. But the minimum pulse width has to be 2. Does anyone know how can I solve this problem??

Hey 45,
Unfortunately, there is no way to generate a pulse width smaller than 2x your external timebase.
There is an option to create a pulse of arbitrary width of your external source if you can afford some software processing in between. What you can do is use 1 counter to measure how many source edges of your card's internal timebase (80 MHz for TIO only, 20MHz or 100kHz for TIO and STC) your external signal is. This uses pulse width measurement as the counter application. Once you know how many source edges it takes to represent your pulse, then you can use triggered pulse generation and use the internal timebase with the pulse specs set to create the exact pulse width you want (and delay) and you can use your external pulse as the trigger. Th
is works well if your pulse is always the same width and you can measure it before hand. As an example, let's say your pulse is 20 internal timebase pulses when measured. This means you can use the pulse specs to specify a pulse width of 0.75 your pulse width by using only 15 internal timebase edges for your pulse width.
I don't know if I was clear above or not but if you give me your exact application you are looking to achieve, I might be able to help you out. Hope that helps.
Ron

Generating multiple Pulse Trains.

I am trying to generate two different pulse trains. Once the first pulse train has begun I need to start the
second pulse train approximately .69444 ms after the first has started. I am currently using the two counter channels on the NI ELVIS, but the second pulse doesn't always start after the first, but it does work sometimes. How can I fix this? Attached is my vi file.
Thanks,
David
Note: Each pulse train has a 33% duty cycle.
Attachments:
SaO2.vi ‏91 KB

Hello,
Here is what I would try:
1. Set up counter 0 to perform a continuous pulse train (see the LabVIEW example called Gen Dig Pulse Train-Continuous.vi)
2. Set up counter 1 to perform a continuous pulse train with a digital start (see the LabVIEW example Gen Dig Pulse Train-Continuous-Dig Start.vi)
A. Modify this example code so that the trigger source is your counter 0 output.
B. Modify this example code so that the initial delay value of the pulse train is 0.7 milliseconds (or whatever delay you want). Create the delay with the input to the DAQmx Create Channel VI (the delay is currently set with a default of 0.00 seconds).
What you are doing is triggering the second counter off of the rising edge of the first counter. So, counter 0 will start generating a pulse train. Counter 1 will not start until the rising edge of counter 0's first pulse has occurred. Once this trigger has occurred, Counter 1 will start (after the initial delay time of 0.7 ms has passed). You can cut and paste to put the code of the two examples together.
Hope this works for you,
Sam

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

Generating a pulse sequence in NI5401 board

Sirs,
I?m sending this email massage because I have a doubt concerning NI 5401 Function Generator Board.
I?m working with a PXI system together with a NI5401 board, and I want to generate a pulse sequence with this board.
The propose of this is to synchronize my pulses with the acquisition of data by another board (PXI board from Goeppel ? Boundary Scan board which has 4 I/0 ports of 8 bits)
I want for each pulse generated to acquire and transfer data in that board, thus I need to know how can I send a predetermined sequence of pulses, (N pulses and then stop). (attached I send a figure to illustrate my question)
Please, I tried to understand the triggers but....
If the triggers is the solution for my probl
em please send me an example.
Note: Now I'm generating a sequence of pulses using a simple pin I/O of the Goeppel Board but the problem is if I run many Labview applications sometimes the software is not fast enough to generate that pulses. Then I think if I use a hardware solution, like in the 5401 board,I could get faster a better responses for my pulses. Note that I'll need to now, in each instant, how is the level of each pulse.
Note2:I'm using LabView6i software.
Thanks very much.
Attachments:
PULSE.jpg ‏25 KB

Hi
The NI 5401 is a Function Generator; this is significant in that it is made to make periodic waveforms such as Sine, Square, and even a user defined periodic waveform that a user can download (the 16K buffer). The board can be triggered to start generation, and with a software call, abort generation. But there is no hardware that can specify how many cycles of a waveform has been generated to control the number of cycles at the output.
Depending on the rate of the pulses you need, it may be possible to do something. A pulse train is essentially a square wave with a certain duty cycle. Set up the device for a certain frequency that matches the rate of your pulses, and program it to start with a Software trigger. The best output to use is the Sync output which w
ill give you a TTL pulse.
After the software trigger is called in your code, use the Wait VI to wait a certain amount of time that corresponds to the number of cycles/pulses for the signal that you need, and then after the wait, immediately call NI-FGEN Abort to stop the output generation.
If you are unable to control the number of pulses through software, the NI 5401 really isn't made for this operation. The NI 5411 Arbitrary Waveform Generator is the device made to do this, create the pulse waveform you need, select how many times you want it to "loop", and then generate a waveform of zero volts. The NI 5411 has the hardware to count number of loops, and trigger, etc.
I hope this helps.
Jerry

How to Generate Synchronized pulses across two separate cards on a PXI system

Hey,
I'm trying to generate three pulses from my PXI System for triggering purposes. I have two cards (PXI 6259 and PXI 6115) , each with two counter/timers on them. The 6259 has 32 bit timers, and the 6115 has 24 bit timers.
Up until now, I only needed two pulses. One was 180us long at 20 Hz, and the other is 5us at 20 Hz, starting 150us after the beginning of the first pulse. I was able to achieve this by generating both pulses on my 6115 card by triggering the shorter pulse off of the rising digital edge of the longer pulse and giving the DAQmx Counter/Timer task an initial delay of 150us.
The third pulse needs to be identical to the short pulse, only it needs to occur 20us early (130us after the start of the wide pulse). I tried to generate it using the same technique as I used when generating the short pulse, only generating the pulse and reading in the rising digital edge trigger on my 6259 card instead of the 6115.
The result was that my pulse trains were asynchronous and the pulse generated on the 6259 card was constantly shifting to the left.
This puzzled me, so I wrote up a little dummy program to test generating triggered pulses. The results were that when I generated two pulses on the same card, they were always synchronized; however when I generated pulses on separate cards, one of the pulses always shifted.
I was hoping somebody could suggest a reason that the pulses across cards are asynchronous even though I'm reading in a digital trigger and hopefully a way to rectify the situation and synchronize all of my pulses.

The problem, in a nutshell, is that the timebases on the two boards have manufacturing tolerances that will cause them to differ from one another. The accuracy error is a small fraction of a percent, but the effect on the phasing of your pulses will be cumulative. That's why you saw the one set of pulses "shifting to the left."
The solution is to make sure each board derives its pulse timing from a single common timebase. Fortunately, this is pretty easy to specify with DAQmx, just a little tricky to find. In the chain of VI's you call to configure the counter pulses, insert a DAQmx Channel property node. From memory, I *think* you should be looking under something similar to "Counter Output->General->Timebase->Timebase.Src"
Right click and create a constant or control to define the timebase source. You should get a dropdown list that includes a wide variety of choices. Among them are each of the boards' 20 MHz clocks. By default each task will use a timebase from its own board but this technique lets you route one board's timebase over the PXI backplane with that single property node setting. DAQmx does most of the dirty work behind the scenes.
-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 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.

How to use single Timer to generate PWM PULSE, Pulse ON time measurement, Event time measurement1,Event time measurement2

Hi,
I am planning to use a single Timer to generate PWM PULSE, Pulse ON time measurement, Event time measurement1,Event time measurement2 some one please suggest me how can I achive this.
Thanks in advance..
Michael

Hi Michael,
It would be really good to understand your application a little more so that any specific needs that you have may be met. In the meantime, I would also suggest searching on ni.com for "pwm" or other keywords that relate to your application. You will see a faceted navigation on the left side that allows you to narrow your search for example code, tutorials, etc.
Please post back with more information and the community will be able to help out with suggestions.
ni.com search for "pwm"
Mark E.
Precision DC Product Support Engineer
National Instruments
Digital Multimeters (DMMs) and LCR Meters
Programmable Power Supplies and Source Measure Units

Generate delayed pulse example VI for NI-TIO 6602

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