LabVIEW freezes randomly while loop

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• CPU utilization while loop

  Manual LabVIEW declare a while loop must always contain a "wait for ms" vi to unlock the task for this period.

  However, I thought that it the same fate if I use the same timeout ms for the timeout of a structure event inside the while loop

  and omit the "wait for ms" vi.

  Unfortunately the time-out of the structure of the event does not seem to unlock the task so that the façade reacts very inert in this case, even if it reacts
  prompt in either case.

  Does anyone have an explanation more in depth of this behavior?

  
  

• Code Golf: stop two while loops with guaranteed ratio iteration

  Proposal

  In the vein of the tradition of Perl, I would like to see if there is any interest to solve a few puzzles programming in LabVIEW. Can someone post a problem and define the rules to solve.

  Here's a question for beginning/intermediate to sharpen your "palette".

  Description

  With a user action, how you would stop two while loops such as the relationship between iterations is the still the same? Concrete to view this situation is to take action: both instruments use the same source of synchronization to take measures, but second divides the clock down so that it is a little slower than the first whole factor. For example, if the slower instrument is four times slower, then at the end of the VI, the slower instrument takes 100 measures the fastest instrument took 400.

  Rules

  • You can use vi.lib
  • You cannot include any other subVIs
  • Your solution should pass for loop1 interval as low as 25 ms

  Model (joint in LabVIEW 2009)
  

   

  If people are interested in this, then we will find a way to improve future problems. Please post your suggestions and criticisms, but only if you also post a presentation ;-)

  MacNorth wrote:

  [..]

  If we choose the first suggestions, the VI has yet to recover the data at different speeds. You can dedicate a loop for each instrument to disassociate a jitter and latency introduced by their connectivity or the inner workings. This adds a margin of safety when there is a conflict of thread and the pilot. You can also implement a simple counting as altenbach loop and renounce the multiloop complexity.
  [..]

  It is a very good point. But I wanted to make sure, you should / need to discuss the benefits, but also the disadvantages of the design. Implementation of an application is most often a process of 'special cases '. If a framework/design for a single application model does not necessarily correspond to another application.

  Designs are always strongly according to the requirements and constraints. What gives here designs will result in educational services, of course, but not necessarily as reference models for specific applications.

  Advantage of simple loop:

  • No synchronization between several loops required
  • Can easily implement any whole factor between services (quotent & function remains for a case structure

  Disadvantage of simple loop:

  • Take advantage of the multi core systems (at least not much)
  • Can easily run out of the time constraints (material not "not responding" enough, fast manipulation of data takes too long,...)
  • Code will accumulate within the structures of the case, where the readability could suff

  The advantage of multiple loops:

  • See essentially the disadvantages of single loop (several loops solve those)

  Disadvantage of multiple loops:

  • More complex, especially for the sync switch (not beginner friendly, requires a more/better design)
  • May contain easily questions source such as race conditions and locks

  A little side note:

  Even if the equipment works different acquisition rate, this does not necessarily that the software must use different rates for data extraction. You can use the same model of an hour, but get X times more values for the task faster than the slower running. The 'only' thing to care of are the sizes of buffers and bottlenecks in the data transfer.

  MacNorth wrote:

  [..] The best advice published OR shutter multiple while loops (https://www.google.com/search?q=labview+stop+multiple+while+loops) are laughable (and the 'solution' in my model). [..]

  No, it's not laughable. For many applications, this approach to shutter at the same time several loops running is OK. The constraint: only for simple parallel running loops.

  More complex loops (producer/consumer and similar) with the more complex data relationship ships require more valiant approaches such as queues, declaring events or user.

  My 5 cents only,

  Norbert

• LabVIEW FPGA while loop (first call? (VI) question

  Hi gentlemen!

  I am creating a LabVIEW FPGA VI appearing in a WHILE loop. He has a first call? VI in which, in the first occurrence of the loop, a variable must be initialized to some value. However, when I incorporate the VI in the FPGA, it would seem that the first call? VI has not been called. I also tried this implementation through registers at offset where the registry is initialized outside of the WHILE loop. However, the result is always the same. May I ask how the LabVIEW FPGA functions when it comes to everything IN a loop? Thank you very much!

  For some reason that I don't me remember not I avoided the use of FPGA FirstCall and instead, I use a change sign boolean, son of genuine in the terminal, on the left and a fake in the while loop to the right Terminal. As a result, you get a true for the first iteration only, in exactly in the same way that the function of FirstCall. It could even use fewer resources on the FPGA?

• Is it possible to execute a loop For independently within a while loop in LabVIEW 2013?

  In my program, I want to run a loop For inside a while loop and run independently, at their own rate of execution.  A test, I wrote a simple VI with a while loop with 1 second calendar and in this I inserted a loop For with 3 of a second.  I created indicators for the two terminals of the iteration.  When executing the VI, I found the while loop waiting for loop For run N times before the while loop is executed again.  I also found that sometimes the first iteration of the loop For ends at 1 second instead of 3 seconds and the STOP button to complete execution of the While loop does not always work.

  This is the expected behavior. LabVIEW is the language of s DATA stream. If you want the curls to be independent, it can be data forcing addictive so use separate loops.

• How to acquire a position of the data series in a while loop that generate a position once a time in labview?

  My program is complete in a while loop. Once it runs, it will use kinect to keep my data of position of the head, so it will generate a position once. I want to reach 5 positions and can calculate 3 speed and acceleration 2. How can I get 5 times while it generates 1 time?

  If your data are made at the edge of the while loop and you right-click where the wire exits the while loop, you can select "Enable Indexing" that will produce a table of the data received as large as the number of times in the loop. You can also check the "examples: help find ' ' Producer/consumer', which will allow your receiver (producer) loop to get the data and send it to a processing loop (consumer).

• 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.

• Retaining the last value without a while loop

  Hello

  I'm using LabVIEW 2013. My VI is attached. I'll send in a 'Curr. Random random numbers TestPlan Row"time. I'm eager to keep his last number, whenever this VI is not called and then reset the value to its new value whenever the VI is called again and a new number has been sent. Also attached is a screenshot at the VI.

  Please note that I can't use a WHILE loop, so it must keep its value in a different way...

  Thanks in advance for any help!

  SM

  Maybe a feedback node?

• read from measure Makefile slow while loop

  Hello

  I'm using Labview for controlling a lower Member brace. What I did is to save in a spreadsheet, the values of two angles in a random walk. The control template is done well because I tested it by giving two sine waves with different frequencies and the system responds by following paths. The problems begin when instead of sine waves, I put the experimental values of the read angles and "the file of the measurement reading. I can't change the speed of the system by varying the time while loop. The speed is always the same.

  In the vi attached is possible to find this piece in the upper left corner of the while loop.

  I use windows 7, 2013 and cDaq-9178 labview.

  Thank you in advance for the answer.

  Best,

  Flavio

  
  

• How to pause and resume a while loop with a button

  Hi all!

  I'm back in LabVIEW, after only a few years and I cannot understand, what at first sight seems to be a simple problem!

  All I want to do is have a while loop in which, for the purposes of illustration, I have the 'random number from 0-1' function on the inside, and I want to be able to pause and resume this help from a button. There are a few other posts on the forum that are very similar and do use "event structures. The problem I encounter is that I can get the genarator random number to start the generation but the break will not stop this!

  I have the feeling that I made a stupid mistake - but I can't understand or google my way out the problem! I enclose my solution so far!

  See you soon!

  I did an example (you can drag and drop the image into a labview diagram > = 2014)

  hope this helps (I just did 2 excerpts, it's the same program)

  

  

• dispplaying data on the graph of waveform inside/outside while loop

  I create a vi using the random number generator, entering the number in the function(express>>arithmateic>>maths>>trig>>sine) fishing and connect the output of the function sine waveforms. Table of waveform show no problem. If I replace the with graphic waveform table, I get an error that the source type is differenct type of sink. I then put waveform chart outside loop everything hoping that tunnel would act as a table, but still I get the same error. I then put build table palette between all border and loop waveform graph which is placed outside the while loop. I get no error, but no data is displayed on the graph of a waveform. Theoretically, if I press stop I would see a distorted sine wave on the waveform graph, but this doesn't seem to be the case. I am wondering how to view data on the graph of a waveform in such cases!

  Thank you in advance for reading and help!

  See you soon

  First of all, you can take a part of the basis of LabVIEW tutorials.

  Since you need to work with a chart and it is the preferred method to display data point by point, I don't know why you try to use a chart. In any case, you cannot use all simply a table of generation because that would be just the result of the last iteration and your graph indicates it is a single point. If you activate autoindexing, then you get all the values, but not before the end of the loop. If you were to use a shift register and the build dashboard, you might place the graphic inside the loop, but then you would face performance issues that the table would grow uncontrollably.

• Table of while loop

  Hello

  How can I get the table while loop in the attachment?

  Any help will be appreciated.

  [Running LabView 8.5].

  Thank you

  hiNi.

  What do you mean by "get a picture?"  You get a table that will have a random number in the 1st item and the number 10 as the second element.

  You try to build a table of values that contain information on all iterations?  Then right-click on the tunnel and turn on automatic indexing.

• XPS 15 9550 freezes randomly (on any OS)

  Hello, I would really appreciate any help that anyone can give me.

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  Download and view a report of Etrecheck:

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