long the time loop

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• 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/

• "1 MHz" for the name of the source on the time loop does not work on LabVIEW Real-time 9.0

  A Loopis Timed running as expected if a time source is manually chosen in the dialog box of configuration for "1 kHz" (first digit) and "1 MHz" (second digit). If the time Source name is set through the input of the channel "1 kHz", the loop is executed, too third figure). But if the input string is "1 MHz", the loop is not executed (last figure). The channel two are created by "create constant" on the entry of the loop to exclude typos. Is it possible to set the Source of a loop time timed through the input string to the real-time clock hard Mhz?

  

  

  

  

  OK, I was a bit confused by the difference between the behavior of error...

  Now, the question is quite clear. Aid for the timed loop provides the following regarding the Source of the calendar entry:

  Specifies the name of the synchronization source to use to control the structure. The source of synchronization must be created using the create synchronization Source VI on the block diagram or selected in the dialog box Configure the timed loop .

  So, I think that you have somewhere in your code a time Source.VI create if you pass "1 kHz" as the name. But you did not do this for your clock "MHz 1"...

  hope this helps,

  Norbert

• Why my calculation at the time loop repeats only once?

  I have a series of simple calculations (multiply, divide, add, subtract) occurring in a while loop based on input data on the front panel of the user. The results are then connected to local variables that alter the parameters of a signal generator in one another while loop.

  The while containing the iteration of repetitions one calculation, unless I turn the button "Highlight execution" in which case it repeats until the loop is stopped as I expect. With the 'performance highlight' button and using a probe to check instead of the loop does not repeat itself.

  Another while loop with the signal generator allows to reproduce, but uses only the values which were concluded before the VI began to run.

  I need the VI to be recalculated each time a value on the front panel is changed and change the output of the generator signal accordingly.

  What Miss me?

  Because local variables are fixed on the LEDs that are in the position it after the end of the VI it runs correctly the first time and only executes a forward iteration to stop, all in a loop containing calculations, if you run the VI more than once. As long as the LEDS are in the off position when the VI is launched then everything works fine.

  Thanks for the advice, everyone.

• 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.

• How can I configure Time Capsule 3 to and Motorola NVG589 to access the Time Capsule backup drive?

  I have ATT Uverse service and am ok with the performance of the WiFi of the NVG589. I want to configure my Time Capsule 3 to extend the network and be able to access the drive for backups Time Machine. I think I am following the steps in Airport utility, but once installation is complete I can find is no longer the time Capsule.

  I want to configure my Time Capsule 3 to extend the network

  The time Capsule cannot "extend" the network Uverse using a wireless connection, if that's maybe what you're trying to do. The time Capsule can only wireless "extend" the signal of another router from Apple.

  The Capsule can be configured to extend the network to Uverse if it is connected permanently... anytime... to the Uverse router using a connection through wired Ethernet cable.

  Please specify on what you're trying to accomplish, so that we can provide the correct steps.

• 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

  
  

• FPGA: unable to update the timer on fpga through host.

  Hi all

  I worked on FPGA project. It has several loops paralel and works with some sampling time.

  I would like to change the "timing" on a single loop, it is called loop output. I would like to slow down the loop so that the loop will update the output less frequently. (see attachment - red circle)

  I modified the code by changing the timer by the host. (see attachment - blue circle).

  I did several things such as:

  1. Add a manual switch that allows me to change the time of sampling mode normal (same time of polling with other loops) in manual mode (set the timer number).

  But it did not work all the time. I checked the value on the host, it is always on the same sampling time, even I write the value of the timer to measure.

  2. I changed the strategy by putting the other control connected directly to the timer (without switch) in the loop so that I can change the value directly. However, there is still no luck. The result is not reliable. It sometimes slows down and many are in the same pace as before.

  3. I even put a case in front of the exit structure so it was only updated after sometimes (all 100 or more loops). It is not always useful. I see the speed varies, but it is not as expected.

  The material is piezo readers/engine. But I want to slow down the speed, does not increase the speed. Thus, it should not be a problem.

  I really appreciate if there are any comments or suggestions.

  Kind regards

  Areku

  Hi all

  After consulting with my supervisor, he advised me to spend on intermediate or new control value first. Then, update the value of the control that is connected to the timer loop with this intermediate control value. It will update the value of the timer loop after loop (when intermediary value received from the host and update control connected to the timer loop). It works fine now.

  I don't know exactly the mechanism labview of drafting or updating the fpga through host value. But, it seems to me, in my case, there was a problem of writing a value to the control that is connected to the loop timer where ran in relatively fast. Well, little control ignore/reject the new value because it is busy to execute the loop in high speed.

  Thanks again for the response to my post, GerdW.

  Kind regards

  Areku

• 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.

• I can't open all the Web sites in firefox(version 25), its long loading time, help please

  I can't open all the Web sites in firefox(version 25), its long loading time, help please

  Hello, normally these problems are caused by a security/firewall software which does not recognize and therefore blocks the new versions of firefox: solve connection problems to websites after Firefox update

• clock in the notifications box no longer displays the date beneith the time

  Series HP Pavilion HPE h8 - 1360t running Win 7

  When I ran Setup and decided that I needed to install the software, I notice that the date is now displayed in the tray under the era.  I was happy that I is no longer my clock application to display the date.

  Now that I've installed all the updates and my usual software, the clock in the notification area displays only the time.  The date seems to have disappeared.

  I don't know what I've done or installed to make it disappear.  I can't find a way to recover.

  Is there a software switch somewhere that turns on the display of the date of the clock?

  Normally, the 'taskbar' are a height of 'one'... the time is displayed. If you unlocked the "taskbar" and stretch up to a height of 'two'... the time, day and date will be displayed. Thereafter, be sure to lock the taskbar to prevent change.

  Please send Bravo

• a stop time loop by using the time difference of two counts of ticks

  Hi guys,.

  I'm writing currently a code test how much time does it take for a formula node perform its operation. The program uses some time to perform the calculation in a loop, and the program stops after having calculated when the number of cycles reached 10 seconds. The program then displays the number of iterations, he does it in 10 seconds.

  If at the beginning, I created 2 images of the structure of the sequence. In my first image, I have my original number, and as part of my second, I have my final number of cycles and the while loop. I used the subtraction function and divide the result by 1000 to get jet lag. Then using the comparison function, I put if output > 10 then the program must stop, to do this, I've linked out of the comparison function to the button stop inside the while loop.

  However, when I tried to run the code, the program just didn't run. That's why I created a similar program that puts the final number of cycles in the new image sequence. When I ran this code, the program never stopped.

  Guys do you have any idea what was wrong with my codes.

  Thank you!

  Erry

  Stream!

  In the two VI the Terminal stop of the while loop is controlled by a Boolean value whose source is outside of the while loop.  If this loop will be executed once, or forever, depending on the value of the Boolean value which is calculated before the loop starts and comes to the tunnel through the loop.

  I recommend you watch the LabVIEW tutorials online
  LabVIEW Introduction course - 3 hours
  LabVIEW Introduction course - 6 hours

• 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".

  

• How to create a control of time for the while loop?

  Hi all

  I want to control my time running of the loop. In other words, I want to stop everything in the execution of the loop after a time (in ms) that is defined by the user. For example user defines Control Panel for 5 seconds before a while loop runs and stops after 5 seconds.

  I don't know is it possible with the while loop. I managed with the timed loop, but this must be wrong with my application. Y at - it of the other loops for timed control if it is not possible with while loop? There is also a simple loop with .vi random number (0-1) as an attachment.

  Best regards

  Jick

  Hi again,

  I managed to solve my problem right after I posted my first message. I did it with the passage of time and the register shift (for the elapsed time of reset).

  Thanks for your replies anyway!

  Best R

  Jick