USB6009 limitation in time loop

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• Time-loop at 1 MHz

  Hello everyone,

  After if you are looking for something already post on the subject, I found a lot of interesting information but no directly who can answer my question.

  I have LabView with time real extension.

  So far, I managed to do a time loop at 1 kHz, but the timer, MHz 1 option is gray, so I can't choose, even with the module in real time.

  Issues related to the:

  -J' heard that MS windows is limited to approtimatly 55 ms of precision. Is this true? I don't understand really because in this case, why NEITHER made a 1 MHz if it is not possible for MS windows to do?

  D ' other hand, how can I do the timer of 1 MHz for my time loop? Is there any process to do with the real time module to do?

  Thanks in advance for your help.

  Vivien

  What you did shows no need to have a while loop clocked at 1 MHz.  Value your ongoing samples DAQ assistant and collect many or all that is available.  Analyze and and for the file.

  A few tips.

  Signals of fusion is extensible by dragging the border down, so you can merge all the signals in a single step instead of having several signals fusion.

  You have the risk of rapid growth of the paintings that fill your memory using the concatenation of tunnels.

  You'd be better off using an architecture of producer/consumer to obtain data in a loop, then go to another loop for analysis and writing in a file.

• Treatment in time loop with microseconds.

  Hello

  I am make only one application in Labview where I capture the image of a camera and image processing. The camera is communicate with the Board of Directors NI PCIe-1433 in the PC with the camera link. This device can operate with a rate of 2000 frames per second. For the treatment of each image in the pc I need a time loop that work with microseconds. The problem is that this time loop only works with MS Windows. If I use the real time module, can I configure this time looping with microsecond or is there another solution?

  Thank you

  Hi xisco,.

  with LabVIEW Realtime, you could create a loop with the order of a microsecond wait States.

  BUT:

  Why do you think you have need of these wait States? What is the purpose of these expectations?

• Order to internal model with cRIO, synchronization of time loop

  Hello

  I work with control design Simulation & toolkit and I want to implement an internal model control to a real-time target. I want to implement my simulation (as an attachment) to the real target (cRIO-9024 OR cRIO-9112). I removed the transfer function of the process, I broke the line and I added my input/output of the cRIO modules. I put a 1ms, Euler ode solver step size and synchronize the time loop. Unfortunately it does not work properly. The loop decreased the speed a lot and I can't get 1 ms response time and, finally, a good answer for my system. This means that I can not 1ms response for loop? What is the problem of the computer, windows or hardware real-time or software? Simple or I did something wrong? All the advice you will enjoy.

  Kind regards

  Kamil

  
  

• problems with timing in a time loop in a structure of the event

  Hello

  I'm using labview to control three motors stepper, running the three stages of different translation in different axes (X, Y and Z). Please see the attached VI, focusing on the structure of the event on the RIGHT side.

  In the Z axis, I am trying to run the engine for 5 seconds, after clicking on a button. I have attampted to do by adding a sub of elapsed time VI within a while loop, located in the tab 'Mouse before Z down' the structure of the event. A similar "elapsed time while loop" is also included in tab 'Z reverse the mouse down' the structure of the event.

  Separately these "elapsed time loops" work very well, BUT when I run a Z direction after another, say 'Z Reverse' and then 'Before Z' then they annoyingly interact. The calendar is gone, with the moment where we add, rather than rebooting.

  No idea how I can reset the time elapsed while loops? Or is there another method better do?

  Thank you very much

  Charlie

  charlieryan wrote:

  I take a wire from the 'i' of the while loop at the entrance of the Sub autoreset - VI of tiem will blink?

  No, connect you to the "reset", not "autoreset".

  

• Windows 1 kHz time loop limit reason

  I use a loop timed in Labview2011. I'm not able to exploit the time loop above 1 kHz or less 1 msec .i read in a reply on the forum which, due to windows, it is not possible to operate above 1 kHz, but the reason no didn't to .i want to know why windows cannot function the time loop above 1 kHz?

  Yours sincerely

  Ali211 wrote:

  I work with Labview RT and I know targeting the PC configuration, but I don't know the reason behind windows limitaion of 1 kHz at max?

  Yours sincerely

  The question is the clock source.

  I used a hardware clock (a NI DAQ device with a built-in clock) to drive a loop timed at 2 kHz, but which is possible using a hardware clock.

  For cycle rates MHz, you mentioned above, you will need to move to an FPGA to get this type of perfromance.

  As to WHY?

  Enter the "way back machine" and setting the target date to about 1979, we find that PC came equipped with keyboards but a mouse is an add-on. If you have added a mouse, you have found that 50% of your CPU is used each time that you moved the mouse. Since all what we had were at the time not big thing BACK. Go forward in time to Windows 3.1 we always run on top of BACK, but we could now use a mouse.

  Now to give the impression that the mouse cursor has keep in touch with the mouse moves, interputs were firing repeatedly and put necessary screen to update as quickly as possible. THEN it turned out that using a clock SO that trigger a 1 KHz has been fast enough to deal with the mouse.

  Windows has been designed to use a 1 kHz clock and until MS decides to use a faster clock, we need lieve in this environment... unless you give up Windows and switch to another OS.

  Ben

• Use of LabView delay in a while loop instead of use the inherent instrument of time loop.

  I have a lmg500 sez I use. It has the possibility of continuous measurement of data, with a cycle of user control loop (always using a while loop but the delay comes from the instrument). The problem is that the time of the loop is not constant. Can I use a very short time (100ms) as the cycle of the instrument of the time, but use a longer period in time loop collect data?

  I know that many instrument offers the same capabilities, so the issue is relevant to each of them.

  Thanks for any help

  You're not going to be accurate with Windows. The time between samples should be that you have programmed the instrument (i.e. the time between each value in the table 1 d) but the rate of the iteration of a while loop always will be the subject of a jig on a bone not real-time.

• Impossible to change "first frame" and play a time/loop/Single Frame

  I work is CS3 and problems by changing the first picture on a graphic symbol. When I type in a new number, it jumps back to the former. When I try to change, play a time/loop/single frame layout jumps to the previous setting. I'm trying to simply change this option on a keyframe in the layer of the symbol on the main stage. I have experienced several times, but failed to get the workaround for the moment. I know I can do what I want. In fact, I do a couple of points earlier in the instance of that symbol without problems. Any suggestions?

  Thank you.

  Tyler

  My guess is that somewhere, you have the box checked synchronization. It sometimes seems to do your graphics to synchronize their animation so that it is always the same and other times that he seems to have no effect at all. So I don't really know what it is supposed to do.

• Time loop writing file of Rio - please help

  Hello world

  I'm writing the data collected on the 32 channels of a module 9205 to memory on board a Rio-9074.  This isn't the final requirement of the application, but this is the first simple step.  Both the FPGA Vi and Vi of the host are attached to this post.

  Writing to the file produced inside the while loop, so that the outside while segments of loop files from time to time (this segmentation is a requirement of our application).  I have attached a sample file of release in this post as well (the output file opens in wordpad).

  In the output file, the second and the third column is a timestamp with fractional seconds.  The lead time is 5 Hz, but if you see the first lines in the output file, you will notice that it sometimes jumps an iteration of the loop - the timestamp, from 0.6 s to 1 s instead of s 0.6 to 0.8 s.  This occurs regularly throughout the file.  No idea if this due to a physical limitation of the hardware, or the clock, or if it's because of something in my program?  If you could please take a look at my program and help me optimize my screws or give me suggestions on why this delay occurs, I would really appreciate it.  Please let me know if you have other questions too, and I will answer them immediately.  Thank you!

  P.S - Writing on an SD card on a 9802 using these programs also causes the same problem.

  Good afternoon Derrick.

  The following link describes the RT FIFO that I mentioned in my previous post.  It is the method you want to follow to get the data from your host RT to your PC so that you can save data to the PC.  It is a method of choice (when it is an option) because of the increased storage capacity of a PC (in general) and the requirement of transformation to write in the file on the host of the RT.

  FIFO in real-time for deterministic data transfer screws

  http://zone.NI.com/DevZone/CDA/tut/p/ID/3934

  Alternatively, you can use something more similar to the example of "RT FIFO Communication.lvproj", found by searching FIFO in the Finder for example of NOR, to log on to the host of the RT.  Remember that you want to change this example; you don't want to write to the file in a timed loop because your hard drive / memory flash access is not deterministic.

• time loop... or how to call it?

  Hi all

  I'm new in Labview and I need to do something as I will describe in the next lines.

  Then you must apply for one thermostat. The thing that I don't no how to do is the following: the resistance of the heater must be turned on for 2 seconds and OFF for 55 seconds. This circle should go until the themperature game is reached.

  Can someone help me?

  P.S. I use LabVIEW 8.5

  Laurentiu says:

  Look, the sumptuous is simple (check the attachament). The .VI is only for a single sensor (lm35). I remind you all that I am new with Labview and I did not intend to use it for complex opreation then this. If I did something wrong, please corect me showing me in a file .VI. I learn faster than light.

  Thus, in order to achieve the temperature measured by the sensor LM35, the heating element must be on 2 seconds and for 50 seconds. But this cicle I want to use separately for each sensor.

  Thanks for your time!

  Really you don't provide enough information. How many radiators are there, how do you interact with them? If you have several sensors and heaters, do the same thing but with a table of readings of radiator and an array of heaters. Code would be almost identical.

  Since your loop runs at a frequency of 1 Hz, the easiest would be to use my method, but of course, a more scalable state machine would be more appropriate. Here is a quick sketch.

  

  Some of the problems in your code:

  • The crux of your feedback needs to be initialized, otherwise it reminds the previous run data.
  • I'd rather a register shift.
  • It is really not a good idea to develop a table without limits like that. What is the typical maximum table size?
  • Place your table output indicator and table across the feedback node, else they drag an iteration.
  • "Insert into array" is the wrong tool. Use 'built the table' to build a table.
  • Why is the front panel and diagram to maximize the screen. This is a bad habit.
  • If the loop stop when the temperature is reached? In this case wire comparison of temperature to the loop in the logic of the right condition.

• setBitmap in a timer loop?

  Hello world

  I'm trying to update my BitmapField Bitmap every few seconds in a loop of the timer, but get an error. Take a look at my code:

  public class TimerTick extends TimerTask {
           int l = 170;
      public void run() {
                bar.setBitmap(Bitmap.getBitmapResource("bar_" + l + ".png"));
                invalidate();
                l -= 5;
                if(l == 0) { this.cancel(); }
              }
          }
  

  I very much cut pngs named 'bar_170.png', 'bar_165.png' and so on. What I get is:

  

  Thanks for you answer, in fact, I overcame it in object method... it seems that this area is something limited to the sense of visibility... That's my piece that works for my goal:

   public void paint(Graphics g) {
          super.paint(g);
          if(l != l_temp) {
              l_temp = l;
          test_bar.setBitmap(Bitmap.getBitmapResource("bar_" + l + ".png"));
          System.out.println("---------------------testing progress bar...");
          }
      }
  

  I use l and l_temp to keep track of the current time. I change it to:

  public class TimerTick extends TimerTask {   
  
      public void run() {
                --t;
                if( t%2 == 0) { l -= 5; }
      }
  }
  

• long the time loop

  Hello

  I want to run the loop for a long time in my application.  If I do it in a few seconds I get a warning message like "Script of this film do flash player to run slowly. you want to cancel the script. " How to overcome this. Please tel me how to overcome this.

  Kind regards

  Kelifaoui has

  file - > settings-> flash-> Script Date tab limited publication (change this)

• How to increase the resolution of the timer loop?

  Hi all

  I use myRIO 1900 for my project of Active noise cancellation. I need to process the audio signal @44. rate of 1 kHz sampling and 50 samples per image. So, I use myRIO personality of broadband.

  Now my problem is simple, I want to measure the time each iteration (loop). I went for the number of cycles normal (msec). Used as a standard [https://decibel.ni.com/content/docs/DOC-11078].

  But my value of the indicator oscillates between 1 and 2. It is supposed to be 1.13msec, but how to find the exact value of timer?

  I think, I can't increase the resolution of tick count (msec) as it is by default is 1 ms resolution and I can't use the clock source external I use myRIO.

  Help me calculate the precise time of loop.

  Thank you.

  RT has express VIs for timers.  You can use this: http://zone.ni.com/reference/en-XX/help/371361J-01/lvexpress/tick_count/

• change the time loop from 5ms to 250 ms?

  are there ways you can replace the loop time 5ms 250 ms? While the test is running?

  sample code in the version of labview 8 are welcome...

  Are you referring to a timed loop? You can simply change the value of dt using the settings on the right.

• While time loop clock pc

  Hi guys

  I have a code that uses a while (currently) loop to open a file and read from time to time (in its simplest form... and... the details are not German to this post)

  The requirements are now tight and the loop (While or Timed?) should play the file once every two minutes based on the computer's clock (accuracy is not too important, certainly not milliseconds)

  for example, time is 11:35... Read file

  time is 11:36... .. do nothing

  time is 11:37... read the file

  time is 11:38... do nothing

  etc.   etc.

  In simpler terms (if possible)... have the loop to execute code inside every two minutes with the coming of the pc clock time sequence.

  I watched call loops (but never used them) and they seem to be a possibility

  Then, someone could show me an example of how best to do so.

  Thanks for your help and best regards

  Ray

  You forgot to update both get into the shift register.