The queue functions are accessible from theProgrammingSynchronizationQueue Operationspalette. The error thrown from dequeueing from a destroyed reference is then used to stop the slave loops. Get rid of the "STOP" button from your LabVIEW program. This program is about a car wash system, where customers can choose different types of car wash. After that, the program runs through the cycles for the respective type before the program resets. Fanuc Profinet ManualPDF Communication manual PROFINET Controller. Text-based languages also provide methods for terminating loop execution upon a specified condition; in LabVIEW, only the While Loop allowed . Solution You can add a button to stop the loop in the VI, set a key shortcut to toggle it and hide it so it doesn't show up in the Front Panel. I tried using stop button inside while loop but when vi is running and if i press button on front panel the vi will not stop. Note: Channel wires are supported by the LabVIEW Real-Time Module but not the LabVIEW FPGA Module. By the way, you should go through the Core 1 tutorial, and learn how to design a proper State Machine, which would result in a clear and logical code. Then, If I press the other stop button of the bigger while loop, it does not work. Space Launch and Exploration Validation Lab Innovations See our approach to solutions Get a Helping Hand From troubleshooting technical issues and product recommendations, to quotes and orders, we're here to help. 11:31 AM. How long does it take to fill up the tank? Sorry if my code seems a little messy. Why is the eastern United States green if the wind moves from west to east? The default setup for the Top-level application window configuration has Show Abort button disabled and Show toolbar when running disabled. your stop button doesn't work, because your Event Structure doesn't have a timeout case and it executes only when the "Insert Step: Value Change" event happens (so it doesn't check whether you pressed the button or not). For a simple while loop I understand how to do this - but the problem is that this while loop is nested inside of an event structure and I'm guessing that the button cannot be pressed while the loop is executing. I am currently working on a LabVIEW project and have found myself stuck on how to make a while loop exit when I press the abort (stop) button. ah Ok. > to abort a running VI. In LabView sequence structure is categorized in two major types: Flat sequence structure Stacked sequence structure. 11:25 AM Effect of coal and natural gas burning on particulate matter pollution. our testing is based upon the user doing something at a set speed - so we can determine how fast they completed the task by timing the data recording. My vi have two event structures. Alternatively, you can use the keyboard shortcut < Ctrl + . You are not updating any LEDs inside your loop. If the time has not elapsed, then the same state is passed into the shift register to be checked again for the timer. I have to stop manually. Two things in your code can keep that from being read quickly. cases within the case structure) with internal while loops that won't complete until a timer has elapsed. And then that iteration where it is read as True will still need to complete before it ends. Contact Us Products Software View All Software LabVIEW TestStand FlexLogger SystemLink DIAdem VeriStand Software Bundles Test Workflow HIL and Real-Time Software Suite Circuit Design Suite You only need to do that once. If you are using LabVIEW 2016, you can use channel wires to stop multiple parallel While Loops with one stop button. Having the terminaloutside of the while loop causes LabVIEW to read the value once at initial execution of the VI. The stop button of the inner loop is working perfectly. So you can go look at others to see how they do things, whether good or bad. Then set the vi properties to run when opened. You have several states (i.e. and Edit Modes. Any ideas about why this happens? I see two things in your VI that could cause the issue you see. Refer to the Related Links for more information about how to achieve this. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Wait on another event. Of course it does not stop that while loop, since that stop button is outside of that while loop. They way that you have it it will only read the button control once when the .vi starts the while loop section of the .vi. Concentration bounds for martingales with adaptive Gaussian steps. See all Driver Software Downloads. Car Wash.vi 38 KB 0 Kudos Message 1 of 6 (740 Views) Reply Solution I tried using stop button inside while loop but when vi is running and if i press button on front panel the vi will not stop. It is also generally not a good idea to have two Event Structures in one loop, because they will block each other. Provides support for NI data acquisition and signal conditioning devices. Hence, no data dependency between the two parallel While Loops. Before anyone says anything about this issue being brought up a lot of times, believe me I have looked at most of those forum posts before deciding to write one myself. Virus scan in progress. Why would Henry want to close the breach? What do you need our team of experts to assist you with? This is the most common solution for complex UI requirements, especially useful for separating concerns of the UI code from the execution code. Hence, no data dependency between the two parallel While Loops. How to connect 2 VMware instance running on same Linux host machine via emulated ethernet cable (accessible via mac address)? - edited It won't be read again until all other code in the while loop completes and the while loop moves to its next iteration. I've tried to put the stop button inside but it worked once and then it was not working again. Not how to do it right. Please enter your information below and we'll be intouch soon. The following block diagram demonstrates stopping parallel While Loops using aTagchannel: The following list describes important details about the previous block diagram: The following block diagram demonstrates stopping parallel While Loops using aStreamchannel: When usingStreamchannels, thestopbutton wired to thelast elementparameter of the writer endpoint inLoop Acommunicates withLoop B. 09-12-2020 The while loop will always read False on the wire whether the button is pressed or not. This course teaches you how to use LabVIEW to develop test and measurement, data acquisition, instrument control, datalogging, measurement analysis, and report generation applications. You can right click the Event Structure and select "Edit events handled by this case" dialog and then uncheck the "Lock panel" checkbox -- that will allow the UI to be live while you are in that frame. From the control palette i.e. Check the STOP button. In constrast a "stop" button, would property shutdown your hardware etc, making sure that the system was left in a sensible/safe state. The notifier functions are accessible from theProgrammingSynchronizationNotifier Operationspalette. And I do not want to stop the LabVIEW program from running entirely - just the code inside the while loop pictured above. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. - edited You only need one event structure in your program. should stay on your deskstop, to be launched at will, since this is sometimes the only solution to stop a fool vi without loosing all your work !4/ unplug the computer, or remove the battery.i believe that solution 4 is the most effective reversible solution, since it works even when labview is not running.if you accept also irreversible LabVIEW: how to stop a loop inside event structure 1 Building/operating on an array inside LabView nested loop; not returning expected result 0 LabVIEW: Count how long a button has been pressed Hot Network Questions Is there a verb meaning depthify (getting more depth)? I have attatched different variation of vi. Academic Volume License. Popular Driver Downloads. The stop button of the inner loop is working perfectly. Do non-Segwit nodes reject Segwit transactions with invalid signature? I have even tried quit buton. 3. To be clear, the EXIT LABVIEW function does have a clear and valid use. Note: Many larger applications already have a queue system in place to exchange data between parallel loops. I think I might have solved the event structure thanks to you, but here you said to use the master loop more. A simple tutorial on how to use an XControl to create a start button.UPDATE: The inputs of the "Run VI" method MUST be wired! Provides support for NI data acquisition and signal conditioning devices. You can set it back to zero at the end of the previous state as needed. The button will stay pressed but vi won't stopDoes the program wait till both get executed for the stop button to work. Please enter your information below and we'll be intouch soon. Making statements based on opinion; back them up with references or personal experience. On the other hand, the red button to eject the warp core is also useful, and you would probably use it just slightly less than the Stop Sign. The United States Coast Guard Surface Forces Logistics Center has a requirement and requesting quotations for the following . 2 Displayed when the control is transitioning from onto off. The button will stay pressed but vi won't stopDoes the program wait till both get executed for the stop button to work. Having the terminal inside the loop makes LabVIEW read the current Boolean value at every loop iteration. Option 1 worked perfectly but I was wondering if you could elaborate a little more on the downsides of using it versus Option 3 which seems to be the industry standard (I'm unfamiliar with Queues but I did watch some videos on them). How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Put your process in the second frame of a sequence. Wait on an event. You need to have ONE event structure inside the WHILE loop, and have 3 cases: Blog for (mostly LabVIEW) programmers: Tips And Tricks. Ctrl<M> only works when the VI is not Running. Signed IPSW files work well with iTunes but un-signing them may result in a device that cannot currently be restored by the iTunes program alone - you'll need to plug your iPhone or iPad into iTunes before proceeding!. TheTagchannel and theStreamchannel have major differences when used to stop parallel While Loops. 11:25 AM 11:28 AM The problem is when I try to press the stop button half way through the program, the program doesn't stop as if labview is not reading the button press even though it works for my friends. Or put a Stop Value Change event in that event structure that will pass a True out to the while loop's stop node. Thanks again! Otherwise the XControl won't wo. 11:25 AM. Under Other Files, select Custom Control. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. If I were to use the master loop for the timer, then how would I reinitialize the timer value back to 0 for the other states? You can Google "queued message handler" for extensive details of this solution. The inner Case Structure does not contain a case for "Button 1 Pressed", so the default is passed, which passes a FALSE to the stop command. A structure or node won't begin until all the inputs it have arrived. Add an event in it for pressing the quit button and stop your while loop with that even. The API 525 discrete compressor / limiter module is a classic '70s design reissued for the wildly popular 500 Series format. Here's a big list of free online training, https://decibel.ni.com/content/docs/DOC-13978. Don't EVER use the Exit Labview function. Get rid of some local variables and replace them with the terminals. You can use a property node to pass the Booleanstopbutton value from your first loop's control to all of the other loops. So you can either configure a timeout case, or configure another event triggered by the value change the stop button. Actually, the car wash example is quite common, and this is the 3rd post I've seen on one in the last few days. The following VI snippet demonstrates one way notifiers can be used to stop multiple While Loops. Select your first image by navigating to Edit >> Import Picture to Clipboard. I connected my arduino mega with LabView,It's running OK, but when I want to stop the program , dont work , So the programa running again automaticly , and for stop the program I must press the "ABORT EXECUTION" button to stop from LabView. Thanks for any help I appreciate it! I will data flow in detail in upcoming tutorials. Version:LabVIEW 2014 Since:1999 Posted July 21, 2013 ZZZ, To allow the PAUSE button to stop the loop, you need to change the behavior of the RUN button event case so that it doesn't lock the front panel. Collaborate with other users in our discussion forums. I've tried to put it inside and it is not working. I also discussed with my other friends and theirs seem to work but mine doesn't and no one knows why. if it's ON, stop, else go to A. Create a separate loop OUTSIDE your UI loop that does your processing with some sort of command queue running between the UI loop and that other loop. If you are running in a tight loop you may have to Press ( Ctrl <.>) several. This isn't it, but it is useful. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. First of all, thanks for taking the time to answer my question. 11:34 AM Is energy "equal" to the curvature of spacetime? NI-VISA. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. The other loop moves into various states at the request of the UI loop it's the one that does nothing until it receives a "go" message and then keeps looping until it receives a "stop" message. Displayed when the control is on. You can create a user event that is the code you want inside your While Loop. 11:59 AM, Well, you know this has been brought up a lot of times . . rev2022.12.9.43105. Counterexamples to differentiation under integral sign, revisited, Received a 'behavior reminder' from manager. Move the Stop button's terminalinside of the while loop and wire it to the Loop Condition. Remove the sequence structure. Provides support for NI data acquisition and signal conditioning devices. Multisim. If I use BREAK button , can harm the Arduino ? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Quote: Right click on the "RUN": Mouse Down event and select Edit Events Handled by this Case. It is preferable to reply on data flow rather than sequence structure to control the order of data execution. Answer: Not so much, no The problem is that while queues and events are similar in that they are both ways of communicating that something happened by passing some data associated with that happening, they really operate in different worlds. This course assumes that you are familiar with Windows, Mac OS, or UNIX and that you have experience writing algorithms in the form of flowcharts or block diagrams. Connect and share knowledge within a single location that is structured and easy to search. If only the first string is set, it will be used for all states (constant). Place a while-loop structure and create a front-panel 'Stop' control; pressing the 'Stop' button causes the loop to terminate. To check this, right-click the Event Structure and open the Event Inspector Window to see if there are multiple events loaded into the event queue. This is what the front panel is configured too for completeness: Essentially what I want to happen is the while loop to execute when I press DWG and in the middle of the cycle be able to abort it. Option 2. Thanks for you're informative reply! Break, step, and probe to see this in action. Your problem is that inside the event structure, by default the UI is frozen so no UI actions (keyboard/mouse/etc) are processed until you exit that frame. Asking for help, clarification, or responding to other answers. When the Deg Wait Go button is pressed, use the "Generate User Event" node to trigger that event. The while loop passes the last value ( TRUE) out. This is a demonstration of how to use the standard Windows close button to close your program. Then, If I press the other stop button of the bigger while loop, it does not work. Thank you and @altenbach for helping me out, learnt quite a few things today and I'm sure there are lots more to learn in labview. Some one can help me ? PD. Move the VISA close outside the while loop. The secret is to not have any case where it spends a long time in. You can request repair, RMA, schedule calibration, or get technical support. I'm trying to make a simple project to practice with LabVIEW: I'm creating a VI with a standard Button and a stop button. The other two loops check the status of the notifier on each iteration. What do you need our team of experts to assist you with? For example, programming statements such as For Loops and While Loops allow code to be executed repeatedly. This solution might also apply to other similar products or applications. NI-488.2. 11-17-2016 Environment shows products that are verified to work for the solution described in this article. First, remember the basic rules of dataflow: 1. Option 3. My vi have two event structures. Thanks, guys. You can stop multiple parallel While Loops with one stop button by passing the Boolean stop button value from your first loop's control to all of the other loops using a local variable for each additional loop. I have this Vi with two while loops. stop button in Labview - YouTube 0:00 / 2:28 stop button in Labview 2,063 views Apr 15, 2020 Using stop button in Labview 1 Dislike Share Save awearlab 809 6 subscribers Comments Add a. Ready to optimize your JavaScript with Rust? Please enter your information below and we'll be intouch soon. Wait until I press a "GO" button. I've put it outside because I saw this tutorial in labview and it is telling to put the stop button outside the loop. What happens if you score more than 99 points in volleyball? 11-17-2016 QDART_WIN_4_8_Installer_00053 Draco_ZS620KL_QMSCT_download Select download speed The file is clean, see report Best Supreme Resellers 7-FAC-for-QMSCT-eng-20180516155727-factory 2 Download (Free trial) - QXDM 2 Download (Free trial) - QXDM. Thanks in advance! Stopping Parallel While Loops in LabVIEW with One Stop Button, Control/Indicator, Local Variable, and Value Property Node Differences, LabVIEW Help: Communicating Data between Parallel Sections of Code Using Channel Wires, Boolean "Until Released" Mechanical Action Not Supported on Real-Time Targets, A channel wire connects the channel output of the, The bottom two loops contains a local variable of the, The bottom loop contains a property node of the, Each iteration of the top loop writes the status of the. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. We now need to place a button so we can change what it looks like. select Boolean and then select vertical toggle switch as shown in the figure below, Additionally, I've tried the same code with a for loop originally (via a conditional terminal so it could stop early) and that didn't work either. The link to download the iOS 15.1 has been added to this post.iOS Firmware for iPhone XS Max can be downloaded from here. The rubber protection cover does not pass through the hole in the rim. If you are using LabVIEW 2016, you can use channel wires to stop multiple parallel While Loops with one stop button. The problem is when I try to press the stop button half way through the program, the program doesn't stop as if labview is not reading the button press even though it works for my friends. Option 1. If you see the "cross", you're on the right track. 11:26 AM. I've used local variable in the structure that it was stuck and now it works! In the previous VI snippet, theMerge ErrorsVI guarantees that theRelease NotifiersVI will not execute until all loops stop. I have another version of this program with state machine, but my professor likes to use this version, so I have to fix it. To stop more than three parallel While Loops, follow the same architecture by adding more local variables to read from the initialstopcontrol. When you make the change from one state to the other, put a value of 0 into a shift register. Attached here is a picture of part of my code (that contains this specific event case which is causing me problems): To spend a little more time explaining what the problem is - I think the code is doing what I want it to do (namely output a set of commands in a repeated cycle with a wait timer) but I cannot stop the code mid cycle (pressing the abort button with my mouse does nothing - as in the button doesn't show it being pressed and the indicator shows no change, I also can't use any other functionality of my program during the cycle which I'm assuming is related). http://www.ni.com/getting-started/labview-basics/pt/execution-structures. Was the ZX Spectrum used for number crunching? For the loops with timers, get rid of the internal while loop. Have it go back to the choice state in the event of a timeout. Solution While the Front Panel appears to be frozen or disabled, it is possible that the event registered in the Event Structure queue has not finished executing. 3 Displayed when the control is transitioning from offto on. The output of the "OR" nodes get written to the LEDs. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. 2. Read the text! I dislike dogmatic statements. It is not needed. This "TRUE" value enters the "OR" nodes. The following block diagram demonstrates stopping two parallel While Loops using a local variable. But if the UI is simple enough, that works. You cannot extend the previousTagarchitecture to have multiple stop buttons. Here you will find a quick guide about the mapping of IO using WorkVisual. 11-17-2016 Move your VISA init function outside of the while loop because you only need to do that once. This is possible because channel wires are asynchronous wires that connect two parallel While Loops without forcing an execution order. Right click on the button and select Import Picture . Labview 2012 Passing Dynamic data into/out of a while loop, Labview how to make a while loop (2) inside a while loop (1) that only executes if boolean is true, LabVIEW: OK Button doesn't update its color after pressed, Labview button freezes after pressed once, LabVIEW: How to update a variable outside event structure in a while loop, LabVIEW: how to stop a loop inside event structure, Building/operating on an array inside LabView nested loop; not returning expected result, LabVIEW: Count how long a button has been pressed. If any of you have any suggestions on how to fix it, please let me know. Gearbox does not protrude above or below common FRC structural tubes Output shaft stays on 1. To stop more than two parallel While Loops, follow the same architecture by adding more Value property nodes to read from the initialstopcontrol. 11-17-2016 Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. I have to stop manually. Move the stop button control to inside the while loop. The Series 90-70 can handle applications requiring up to 12,000 I/O and up to 6MB of memory. If it's the OK button, do some stuff, else do nothing. I have even tried quit buton. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Thanks very much . Something can be done or not a fit? Since: Posted August 10, 2010 (edited) The biggest one, especially with safety is that the Abort button will not carry out any proper shutdown routines - your application is stopped dead. How could my characters be tricked into thinking they are on Mars? How to use conditional stop in for loop - LabVIEW - YouTube 0:00 / 2:29 How to use conditional stop in for loop - LabVIEW 12,993 views Apr 17, 2016 Learn how to implement conditional stop. 11-17-2016 From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. Why does my LabView while loop appear to execute one too many times? For more information about when to use a local variable versus a property node, refer toControl/Indicator, Local Variable, and Value Property Node Differences. Please wait to download attachments. To add more stop buttons, follow the same architecture. Your Stop button is read within the while loop, pretty much right away on every iteration of that outer while loop. After the VI stops you can. Not sure if it was just me or something she sent to the whole team. Thanks in advance! Versao32.vi 205 KB 0 Kudos Message 1 of 17 (4,008 Views) Reply Re: My stop button is not working RTSLVU Trusted Enthusiast Granted it may work but as this issue has shown, you really need to learn the basics before you tackle a program of this magnitude. 09-12-2020 It is listed as a common mistake. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. However, you can add one or more stop buttons using theShare Stop SignalVI located inlabview\vi.lib\ChannelSupport, which allows you to stop multiple parallel While Loops with any one of the stop buttons.The following VI snippet demonstrates stopping multiple parallel While Loops using either of the two stop buttons. Except it won't necessarily do them in that order. Hi. A valid service agreement may be required. I do not recommend this solution generally unless you have an extremely simple user interface because it leads to the user being able to change controls without the events behind those controls being processed (not a good UI experience for users). Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? If a VI has these settings and is also set to Run When Opened, an option under the Execution Properties, the VI may seem inaccessible if the application hangs or encounters an infinite loop. A structure or node won't complete and pass data out until all the code inside of it is completed. This means: Your LEDs only get updated after your while loop has . Thanks for contributing an answer to Stack Overflow! A valid service agreement may be required, and support options vary by country. events button labview Share Follow asked Jan 30, 2018 at 5:58 Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. You can request repair, RMA, schedule calibration, or get technical support. You're emisunderstanding the EVENT structure. You can use queues to stop multiple loops running in parallel for applications that involve more complex behavior. Learn how to implement conditional stop in for loop in LabVIEW. Then unbundle the stop from there like normal. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Executing Case Structure Once in While Loop LABVIEW. When I press it, it get out of the loop. Watch how changing the control values of a and b updates the indicator value of a*b. Click the Stop button to stop the The following list describes important details about the previous VI snippet: Note:Ensure that the notifier is not released until all the threads monitoring it are stopped. - edited For the event structure, use the timeout case that is already there, but wire up a timeout value to the timeout node. Does a 120cc engine burn 120cc of fuel a minute? The following VI snippet demonstrates using queues to stop multiple While Loops: Some applications using a Master-Slave architecture release the queue before the slave threads exit. If any of you have any suggestions on how to fix it, please let me know. LabVIEW. Place a button control onto the front panel. If all the buttons in you cluster are switching instead of latching, you should be able to use a local variable for the whole cluster. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. Do the same thing in the user event case so that the event re-triggers itself if and only if the Abort button has not been pressed. Examples of frauds discovered because someone tried to mimic a random sequence. I think it is stuck at that structure near mover button. Stop button in LabVIEW cannot be pressed during while loop execution inside an event structure. In lieu of relying on an error condition to stop the slave loops, the previous VI snippet has a discrete stop instruction that is passed on to the slave loop from the master loop. Contact Us Products Software View All Software LabVIEW TestStand FlexLogger SystemLink DIAdem VeriStand Software Bundles Test Workflow Mechanical action Change the mechanical action on a Boolean control NI-DAQmx. Not the answer you're looking for? You can OR that with the existing stop button. How to stop vi using stop button in front panel? Find centralized, trusted content and collaborate around the technologies you use most. Your code does this if you roll a 6: The while loop runs 3 times, as fast possible. a dropdown by right clicking on the front panel. Let the master while loop iterate more frequently. If the time has elapsed, then move into the next state. A valid service agreement may be required. So the stop condition can never get True. A valid service agreement may be required. PS: Why are all of your terminals sitting on the left side unused, yet you use tons of local variables. For some reason I struggled quite a bit on this one, just didn't quite know how to do it. the VI settings -or- you can Press (Ctrl<M>) to change between the Run. This way the while loop will look and read the button control on each loop iteration (see image attached). Also, you have one state, "Choice", which has an event structure with no timeout defined. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? Labview LED control example with switch Lets' work with the LEDs, create a VI as we have done in tutorial 1 and save it for future use by selecting File>>Save as or by pressing <Ctrl+S>. To learn more, see our tips on writing great answers. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. This is possible because channel wires are asynchronous wires that connect two parallel While Loops without forcing an execution order. The following block diagram demonstrates stopping two parallel While Loops using a property node. Close Your LabVIEW App with the Windows Close Button - YouTube 0:00 / 3:07 Close Your LabVIEW App with the Windows Close Button 3,849 views Feb 5, 2015 14 Dislike Share S5 Solutions 33. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. You need to understand data flow: when your VI starts to execute, that Stop button value is only read once, and never again. For applications that involve complex behavior, notifiers can be used to stop multiple loops running in parallel. The best indicator of "design went Mad Max" is when you see lots of Flat Sequence structures and multiple Stop buttons in a VI (and when it is so big, that I need to buy a new monitor to see the whole block diagram). In the first frame put. What do you need our team of experts to assist you with? When the VI is running, I' clicking the button many times and then, when I click on STOP, I would visualize on Front Panel a "List" (I'm using an array for this) which contain a timestamp for every button pression. Because you have the stop button OUTSIDE your loop. Facebook: http://www.facebook.com/LabVIEW-Advantage-209506362772803/ Twitter: http://twitte. Provides support for NI data acquisition and signal conditioning devices. 11-17-2016 Right? You can request repair, RMA, schedule calibration, or get technical support. function in it (set to 100)). The procedure is as follows: Say before user presses the button it appears like this After user presses the button it becomes Then the led turns on Once it executes the event the button goes back to The block diagram is shown below: I am puzzled and could someone please help me ? Any ideas about why this happens? 1 Displayed when the control is off. Click the Run button on the VI you just created and change the values on the front panel. - edited When I press it, it get out of the loop. Queues can't tell when events occur and events can't trigger on the changes in queue status. Quite frankly your code is just wrong on so many levels the stop button is the least of your worries. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. times to get the VI to respond (by stopping). In these setups, the existing queue may be modified or enhanced to include a stop instruction for parallel loops. The loops are in parallel, but the way the project is set up, the stop button is in a cluster of other buttons, so a local variable isn't working. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? (Kind of weird in that you are sort of hybrid using events and a polling scheme.) a while loop with a continue button (don't forget to put a wait x msec. I slept on it and I found a way to do it in the morning! Anyway, I've moved the stop button and it is still not iterating the loop. Since its inception in 1986, National Instruments LabVIEW software has incorporated programming concepts similar to those of text-based languages. See our approach to solutions Get a Helping Hand From troubleshooting technical issues and product recommendations, to quotes and orders, we're here to help. Note: The use of notifiers scales easily to multiple threads, but does not always integrate well with existing program architectures. Open the LabVIEW start up window and under New, select More. I didnt understand it well. Qdart DownloadQDART-MFG: QUALCOMM Technologies Incorporated. change. On the front panel, you'll notice that when Button 1 is pressed, the "Processed Message" indicator will show the information passed by Button 1 Using A Common Queue For Different Data Types If you do not configure loop timing, a while loop will continuously execute and not relinquish the processor to other tasks. my final task is to create a button on the vi that will start and stop the data acquisition while measuring the amount of time that it has been recording. Your code will pause there indefinitely until you press the Deluxe or Economy button. If I were to use the master loop for the timer, then how would I reinitialize the timer value back to 0 for the other states? If it's the INSERT STEP button, do some stuff, else do nothing. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. If the UI isnt frozen while events are handled, you can have users click a button then click on other buttons that are supposed to be grayed out after the first button press thats just one example of the odd UI states that become possible. 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