leads the value change in the structure of the event

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• structure of the event recorded does not change value

  I have a VI that communicates with an FPGA via a telnet interface.  I have several Boolean controls on the front panel.  When you click a control, it sends a write command on the face i in telnet to the FPGA.  Similarly, if a process in the FPGA himself wrote the same registry (that control written when I clicked on it), an order is generated in the FPGA and returned to the VI and the control (via a local variable) lights or unlights accordingly (based on value).  In other words, these controls are read-write...

  It's all workers, except for one important thing.  I have the code that runs through a structure of event whenever the value of the control changes.  I can see that this code executes in fact when I click on the control via the front panel.  HOWEVER - when something is generated in the FPGA finally changes the value of the control, the structure of the event does not, even if I see the value of the change of control on my front.

  A specific example, I have a control named CLIENT_LB.  When I click on CLIENT_LB, I see it lights up, and I see the event structure code run.  Now, if I have the FPGA process to set CLIENT_LB to 0, I see unlight on my front, but does not run the code structure of the event.  I have probes in place who have checked the associated local variable CLIENT_LB evolving impact of values.  The structure of the event reads: 'CLIENT_LB': value change.

  Shouldn't an event structure "value change" run when the value changes, regardless of whether if it happened manually (i.e. me by clicking on the control) or automatically (i.e. the FPGA written in VI and changes the value of the control)?

  The VI is great, and you would not be able to test it in any case unrelated to the material, to remedy that I've attached 2 screenshots, I have described below.

  1. This is where the string from the FPGA analysis occurs.  The chain between the sub - VI, and then the data chain part is hidden to determine if the Boolean value of the control is true or false.  I put a probe on CLIENT_LB, and I see that as the FPGA changes the value of the register, CLIENT_LB passes from false to true as a result.  I checked this several times.

  2. it is the structure of the event.  This code runs when I click on CLIENT_LB on my face, but does not run when the peak CLIENT_LB #1 local variable is changed.

  Writing to variables never fires events to "change the value. If writing should raise this event, use the property "Value (follow the signs).

  Norbert

• Structure of the event run only on first change of the value

  Hi all

  I would like to a structure of the event to run only on the first change of value. I currently put to run on the change in the value of a Boolean value. I'm only interested in what happens the first time that the Boolean value changes; However, he changes several times during a single run of my vi. Is it possible to limit the structure of the event so that it runs only on the first change of value? I have attached the relevant part of my VI. Thank you in advance for any help, you will be able to provide.

  Thank you

  yp21

  
  

• Button value change records in the structure of the event, but does not change appeaance?

  Hello world

  A quick question... I hope someone can answer...

  I have a code that uses a PS button within a structure of event to trigger a signal of AO... My code is below. The code works fine and the OD goes off when you press the button E-Stim... But when pushed the button does not change with reliability the appearance (i.e. of the gray 'off' red 'on' color)... Sometimes color changes; no other time not... If I remove the structure of the event and the survey button in the appearance changes as expected.

  What is going on? I would like the button to change the colors on the user interface to indicate that it works... Should I programmatically control the color?

  Kind regards

  Jack

  

  I guess that when query you the button you have some delay in your loop? Locking means that the button will change its value when you press it, then switch back to the original value once the value of the control has been used by the code. When you ask, this means that until he reaches the next iteration of the loop, but in the case where the structure that will happen immediately.

  The default setting for the buttons to modify its behavior as in most of the application would be latch releasing. You then raise the event when the button of the mouse over the control. This also allows "drag" control if you push down on the subject, given that you do not release control in this case.

• Structure of the event with value changes

  Hello, I had a problem with the use of a structure of the event. I want the values to change the table itself when the user changes the units, such as the flow rate 4 l / min = 240 l / h... It should appear in the same table. I've already got a code here, but it's quite confusing and does not

  Could you please help?  Thank you

  So that it doesn't?

  How it did not work?

  What you want it to do?

  What did do?

  We cannot read your mind, you must explain in detail.

• How to trigger the value change in the structure of the event

  HII everyone, like the title, how should I trigger the value change event to display a message... Here is my connection... I want to trigger structure of the event to bring up the subvi, when the flame and the led are TRUE State... I have using the node property, but still not able to run event structure... How should I connect? Thank you very much...

  There are several ways you can do. First of all, you need to configure your sub - vi while he does everything you want when you run (in the properties of vi, top most window for example) and to make sure that it closes completely when you're done (when you click on the 'OK' button, for example).

  Spend you need an asynchronous call to the subvi. There are several ways to do so. My favorite one below. You go in the palette under 'Application control' and select a static reference VI. I like this approach because it keeps track of the way subvi for you, as long as the subvi is in the same project. Then, drag the sub - vi on the empty square which will be changes to your sub - vi icon. Then, you connect to an invoke node in the same palette under and select run VI. "Wait, that 's" set to false and the main VI will continue to function after the start of the vi of Sub. Together "Auto Ref" is the best way to go. Otherwise, you will need to follow the sub - vi reference and shut up yourself when you are finished.

  

• by using a structure of the event to restore a Boolean control with change in value for the menu ring

  I'm trying to get two Boolean buttons to reset when the value of a ring menu.  For this I use a structure of event defined to execute with a ring value change.  However I have another code that should be run while the structure of the event expected to change value.  I place my structure of the event inside the while loop buttons reset as expected but my other code is not run (except when the value of change). If I place it outside the loop the rest of functions code as expected, but the buttons do not reset.  Any help you offer is much appreciated.

  Hello

  ADD TIME OUT EVEN AND GIVE DELAY OF 100 MS.

  Adds the case-application-timeout event

• Can I record a value Object Variable Global change in a structure of the event?

  I have revealed a global variable to the user via a panel of sup, so that the user directly changes a global variable Panel.  This works very well for this application.

  However, I would like to respond to that in a structure of the event.

  I tried to register for the GV-> [command] Panel.  It seems to work, but the changes do not generate an event.

  I then tried to save the commands individually.  Also hosted in the code, it did not work at run time.

  Is this possible?  Any ideas on how to make it work?

  
  

• At all indexes on tables of the same value in the structure of the event

  Hello

  I have a panel with the four bays and I use a structure of the event.

  Now, I want that change of the index of array_1 also affects the index of 3 other tables at the same index.

  But there is only a property "value Exchange" and no property 'index-change' in the properties of the table.

  So I read the 'index' property and write in the other table.

  But: It seems as if I have to do so within the period of waiting-section of the structure of the event.

  Is there another way to do this?

  Thanks for help

  You can use the mouse event on each table to detec the event (of course, that will attract not only a change of index, but I don't think you care too) and then use the 'values of the indices' property on all the table to set.

  See annex VI (LV2012), hope this helps

• Picture of the events of clusters - change value and the mouse down

  Hello everyone

  I am facing a problem of triggering events using two arrays of clusters.

  I have two paintings of clusters: A and B. There is a Boolean control within each group and to maintain the two paintings in clusters at the same index value (indexVals), the vertical scroll bar of A is hidden but the vertical scroll bar of B is visible. I was using a case with 3 cases triggered by structure: the mouse down, timeout and the mouse upwards. The case of "mouse down" feeds of terminal 1, which makes the case "timeout" the waiting period. The case of "timeout" continues to fuel terminal 1 timeout and has two property nodes (one for A and for B) makes the value of B indexVals is written on the indexVals of a. inside the case of "mouse up" it has a value of-1 for the terminal timeout, putting an end to the process. OK, it was working great. But...

  Now I need to keep the same procedures described above, but I need to raise an event when the user clicks any boolean (led) change state. I thought about the event "change value", but when I click on the led to trigger the event of "change value", the "mouse down" event is also triggered.

  Any suggestions?

  The real VI is a little different from what I described, but the problem is exactly the same.

  Thank you

  Dan07

  Like this:

  

• Behavior of structure the event when a property of the control is changed

  Hello

  Is the normal operation of VI attached? Why the change of ownership of a random control would affect the behavior of an event structure?

  THX

  

  Don't don't never use a structure of the event within a structure of the event.

  Reading guard and recommendations when using events in LabVIEW

  What you saved to lock the hard VI, is that you turned off the setting of Panel lock before your event to their default value being checked.

  The reason why he reacts this way is that the component: the mouse to the top of the event occurs when you go and click on the toggle.  So as soon as you mouse down on the chain, this internal event structure already as the pane: mouse event queue to the top and runs immediately.

  (In fact, that while loop is useless because the while loop can execute only once.)

• Programmatically trigger a structure of the event with the value (signaling) is not responding

  Hey, in my attached program I check if the two steps of translation are in a specific position. If Yes, I want my code to execute a sequence of movements. If this isn't the case, I'm asking the user if he wants contributed from this position anyway. It has three options: Yes, go to load (the specific position) and cancel. If he hits Yes, I am using a property of signal value which should update the controls Boolean true, allowing the sequence. Cancellation and work "to load" perfectly fine, but 'Yes' does not work. I think I need a structure of the event to ahndle the value of the Boolean control 'x' change event, however, the addition of this structure of the event for some reason any even do not allow me to click on the Start button of the procedure.
  Thanks for any help in advance.
  Doug

  Really, you should look into using a State Machine.  You should have really not what happens inside a structure of the event.

  In addition, I would like to use a shift register to store this value instead of a front panel control.

• Change the condition in the structures of the event

  Hi all

  I am a student doing a project. I am very new to labview and I don't really know much of the function in labview. In any case, I have this timer made by using the structure of the event if I'm not mistaken (I downloaded this timer among the post on this forum). This timer will start at 0 sec, count up to 20 years, then stop. So what can I do to change the time of the end of this timer? Let's stop at 50?

  The program is attached. Please please explain or change the program and attached as a response. I tried to understand the help function, but still do not understand.

  I thank very you much in advance!

  Hello

  Thanks for your inquiry. The attached VI uses programming structures: while in the loop, the structure of the event and structure of the case. You'd have to change is in fact the case structure. Before going to, let us go through the different structures. Open the block diagram by going to the Menu bar of the front panel and go to the window-> open diagram.

  

  The while loop resembles a Do loop in text-based programming. It runs until a condition is met. Since the attached VI, it stops running when you click the exit button.

  The event structure is a structure that consists of sous-schemas. The structure meets the interactions with the objects of the front panel. For example, if you click Start or stop in the façade, the structure of the event will be a case that corresponds to this interaction. In the attached VI, the case, which corresponds to the interaction with the button start or stop, called 'Start', 'Stop': change the value. Each box contains an event handling routine.

  Structures of the case are like spending statements in the programming of text. Take a look at the 'Start', 'Stop': value change event. It contains a routine which consists of a box structure. The case structure meets the called Start input terminal (which is in fact the Start button on the front panel). The case structure switches between cases according to this entry. To display the different case just browse the structure of the case by clicking the left and right buttons. There are only two cases: true or false, as the entrance is a Boolean value.

  Now let's take a look at the VI. Take a look at the case "Timeout" of the structure of the event. This is where the change should be made. Change the structure of matter by editing the case. Change the numbers in the structures of the case: ... 20000 to ... 50000 and 20001 at 50001 This should do the trick.

  Kind regards

  Alan Bong

• How to get the ActiveX component value change event?

  Hi all

  LV 8.6.1

  I try to get the ActiveX component value change event. I covered forum and through examples, but I can't get an idea of how "Recalling vi. For example, in the example 'ActiveX event Callback for IE.vi' it is used "recall vi". I've added an example where the change event of value with the mouse to the bottom of the event are scheduled to the structure of the event. Mouse down event OK work but change the value no. Can anyone describe what I need to add to my example vi who value the change event works fine?

  BR, Jim

  Here is the solution! "Value changed event" is not performed in the structure of the event, but in "Reminder VI".

• Value change event, be it be programmed to trigger only when the USER changes the value?

  The structure I set up is the following, I have a control in which the user chooses a value when they choose this value, the value change event takes place setting in the device. Then I am bed in unit values and display them in this control via a property node.

  My problem is that whenever I read back a new value in the control, he takes this as a value change event and resets the value within the system, is it possible to make this event don't move when the user changes the value?

  Yes!

  My thoughts are that you use a Value property (signalling) node to display for the control. That will trigger another call to event.

  Use the NO signs of property value node or a local variable.

  Your postal code, if this isn't the case, then we can help you understand what is happening.