Structure of the event in timed loop
Quick question on the structures of timed loops\event
What is a good or a bad idea to use structures of event call loops - as opposed to while loops. ? I guess I like the idea of call loops - because you can prioritize them - so if there are some important things you need priority of 100% in the background - but for the user interface, you can configure it to run slower\or run to a different priority level.
I just wanted to check it is not a reason why I shouldn't do that - since all the examples don't do that.
I don't think it's a good idea. Your timed loop can stop waiting for an event. There is no advantage of placing the structure of the event in a timed loop. It is possible to assign priorities to other objects outside of the call loops. For example, you can the priorities given to subVIs. I'm reasonably sure that the structure of the event can work at other priorities if you do not the activities of the user interface. Maybe someone of NOR can confirm this.
But the goal of a timed loop is to have a deterministic periodic job. The structure of the event must be used for asynchronous events. The two disagree with them if they are in the same spot.
Tags: NI Software
I have a question about the structure of the user event with 2 buttons?
key 1: START LOGGING DATA
key 2: STOP LOGGING DATA
How do I control my
structure of the event so that it will work? because now that the loop is save data... I can't stop the loop, when I clicked on buttons.
the problem with moving it is that I don't have control of the DATA RECORD STARTING?
Of course, you do. When you get your press conference button, you say your state machine to move to the State of logging. You must also make sure that you return to visit the State to wait for the event to check out the events of the stop button.
I'm still fairly new to Labview and this may seem a simple question. I'm doing a Subvi to display, edit, and create configuration files. I use a ListBox to list all sections of a config file and structure of the event to update the values in each section, when they are clicked. The problem is that the structure of the event seems to be a break the while loop so that the buttons do not work until the event has executed. What I would like is the while loop to run continuously and the event to run only when I click in the listbox control. I hope this makes sense. There is a peak in the diagram below. Thank you
There are a number of issues with your code that could cause problems:
- You must use the FP. Open method to open the front panel of a VI and of the public Service. Close method to close. I don't remember exactly the problem, but starting with the 7 worm nor indicated that these methods were the preferred way to perform these tasks.
- Based on what seems to be the code, the event for the control of Presets of wood should be a change the value - not a mouse down event. After changing the type of event, use the event data NewVal to drive the indexer table index entry.
- The buttons Ok and cancel them should be handled in their own events to change the value. The value change event Cancel would exit the loop, while passing the output error (which indicates that cancel was pressed) and default values for the other 4 outputs. The change of the value Ok event would leave the loop by passing the values that the operator had concluded the 4 controls on the front panel.
- An event of timeout with a very short time (1 msec) would stop loop if an error has occurred, or the output of the gate AND is set to true.
- The wait function is not necessary, as is the case outside the loop structure.
I am writing a program that uses data from an aerial camera to control a robot differentially articulated around a track. I'm new to LabVIEW and I have a question to get the structure of the event and while loops to work as I want. My code currently has three while loops, running in parallel, to treat the image in the necessary data, one to use the data to locate the robot and the last to issue commands to the robot. I'm trying to add in a Subvi calibration that will recalibrate the camera early upward, and whenever the user clicks on the calibration button. Basically, I want to stop/pause the three while the curls then run the Subvi, then start the loops up using up-to-date data of the Subvi.
I thought that a structure of the event would be the best way to do this, but I can't seem to make it work properly. I have provided a fake version of the main VI. If someone could point me in the right direction on how to do it and also if anyone knows a good place for the tutorials for this sort of thing that would be great.
Thanks in advance
I'll look in producer/consumer architecture and see if I can make it work.
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
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".
I have a problem. I want to use a single control to activate an event in a structure of the event and the same control to end a while loop in this case.
It is possible to use 2 controls to do this, but I need to be alone.
You should NEVER place while loops inside the case of the event, and it is never necessary to do. Think about it: all you have to do is spin the code. You can easily use the outside while loop for everything. Simply place the code of the loop internal (without the inner loop) inside the case of delay and manipulate the time-out period between a pending finished and the infinite (-1), depending on the State of the Boolean value.
A very simple example (LV 8.0)
Hi fellow users of LabVIEW
I try to incorporate a structure of the event in my current exisiting VI to Save certain values of control as shown in this post
It's the VI that I use as model with my exisiting VI.
In case the 'stop, change the value' I use in the main VI and a 'real' constant instead of Boolean control of wire structure. While the loops are not connected. The table that I use in my exisiting VI (another while loop) is indexed and unbundled to be used here.
The work combined well screw and it gives me the results, my question is, in the long run it will give me issues. Do I still need to synchronize?
Thanks for all the help.
There's no problem because loop additional lower with the structure of the event.
Personally, I worry about the top loop. Why so complicated? Why so much duplicate code? Why all these hidden indicators serve as local variables?
Why don't simply place you the table in the entire cluster in a shift register and the index and ungroup by name wharever value, that you need to access. No hidden local variables or indicators.
I have two questions, first of all, what is the best way to receive messages in case of structure? I've been watching the user events, and which seems to be a good option if I want to never send a single message. Ive never found an example where the regester for events has a second event its looking. I currently use queues to the structure of the event to my other loops.
My second question is I want to even send messages to the structure of the event, my current thinking is that it would make things easier to follow if the structure of the event sent all messages to the individual lines. Is it more appropriate to have just a loop of talk directly to one another through the queues already in place?
IM thinking ill put in place a user for handlng errors event but I'm not sure on other messages.
Thank you guys
You can get events for individual events. Better yet, you can use clusters to group the different events and access them individually (see below).
Sorry for my English
I have to stop to a Subvi my main VI, the Subvi contains a while loop and an event structure, so I need to stop this loop while I tried directly from my main vi, global variable, but it did not work
any help please or example!
How about something like this (solution see attachment) using a user event.
Explore the User Interface--> range of events and dialogue. To display the dynamic event of the terminals in the structure of the event just right click and select 'display the dynamic event posts '.
I have some problems with control of a while loop inside a structure of the event (see annex VI).
I have 3 buttons (the "Start measurement, stop, exit the program"). When a measure is running, it should be possible to stop the measure by clicking on "Stop the measure", but it does not work.
Someone at - it an idea?
Thank you very much and best regards,
create a process parallel to your measurement. You can use the design model "producer/consumer with vents. You'll find it with «File-> new...» ».
Another possibility would be to remove the "lock frontpanel" sign, in the case of event start measurement.
I'm relatively new to LabView and in particular the structure of the event. I was looking at the previous posts regarding the structure of the event and the difficulty to stop people. In my VI, I have two cases of event besides the time-out. I use this VI for control of stepper motor. I have 2 buttons (for each case), a movement to the left, the other to the right. It works as it is supposed to, but when I try to turn it off I have to press the two buttons before it stops. As if the loop should run everything inside before stopping.
In my VI, how can I do the execution stops when I press the stop button? I tried many configurations of the stop button and boolean logic (which I believe was correct), but I am now stuck.
Thank you very much
I have the main VI which I want to be driven from an another VI. But I can't do that and I don't know what is happening.
For example: VI main, I have a while loop with a structure of the event, there is a Boolean controller controlling a Boolean LED, which is inside the structure of the event. And the other VI, there is just a Boolean controller and functions of applications to open the main VI.
How can I control the Boolean LED in VI main, changing the State of the Boolean controller in an another VI?
There are different options, but depending on what you want to do. For this example I can't give you a specific solution.
I do not understand why you do what you do. Why do you call your 'principle VI' dynamically? What is the advantage to do? There are also other ways to call a VI dynamically, based on real cases (for example the method "call and forget", etc...).
In you principle VI, control you Boolean ("THATCHER") is not the case of corresponding event. This is not usually a good practice, keep it inside.
Also, why you try to communicate with the caller and callee VI through such a way to twist? There are better ways to do it.
In one of my projects, I use the user event to launch orders in case of case of appellant VI.
some Associates more readings for you:
Is attached a valid way to the use of the structure of the event? I keep hearing that the case of the event should include control of the event. Can the control be placed elsewhere? For example, if I have 2 loops, I placed a structure of the event in the 1st loop and control associated with the event in the 2nd loop, is there a potential problem? It is true that no matter where a Boolean with a value change is read, the Ministry of value in the event structure will be fired? See attachment.
This screenshot you posted should work for you fine.
The main reason that you hear the case of the event should contain the control for the event is so that the control is read and for locking of Boolean values, gets reset when the case of events runs.
Here since the first parallel loop runs (assuming nothing else in the loop causes the loop to get blocked), the stop button will read and reset. The value change event will always be raised in the upper structure of event loop.
I tried searching the forums to avoid posting a duplicate, but more I couldn't open most of the vi as they were higher.
I put in a dummy while loop in an event structire I intend to use. Once I have begin to execute the while loop, I am not able to stop using a control for some reason any the fornt panel control.
I am not able to change the vale of the shutdown command at all. I tried to create a separate event for the STOP, and I still couldn't stop the program when the While loop was running.
I guess I'm missing something really small. I would appreciate your comments on this.
Right-click on the structure of the event and choose 'edit events' in the case that gives you bad.
Make sure that the check box lock the front panel is not checked.
I suspect that yours is checked, so your front is locked until the end of the event, so you can never stop your loop.
I have a small problem, when I raise an event using a value change button, which works very well. The problem is that the VI does not wait for me raise an event and instead runs the same event again, even if I have not pressed the button to start again. The mechanical action of the button switch is released is.
I was wondering how you get the structure of the event to wait for a user event, after that he executed the first time.
There is no reason that the event should be raised twice as much that the only way that it fires in your code is by the user by clicking on 'Hall measure only'.
Oh yes, there is, and I deserve a kudo for this one. Mechanical action on the button is set on the switch until published, so click to generate an event, on the bottom and on the square, attached is an example.
My boy has my students hate this question, and to be honest, I hated it. When never would you do that intentionally? Honestly? Anyway to change the button back to normal (as default latch when released) and move the terminal button in the structure of the event where it is managed and it will work as usual.
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