Programming of the event with digital I/o

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• Globals (LV7.1) and the programming of the event?

  I have a problem with a LabVIEW 7.1 application I'm developing.  I've used LabWindows/CVI and used for programming of the event - drivent in the morning.  My request is to and reading data from a dozen test instruments (all types), according to what the user wants to do.  The diagram of the application is a While loop with a Structure of the event inside.  The while loop runs until a "stop" button is pressed, and the structure of the event manages each different instrument.  I initialize all the parameters of the instrument outside the loop so that they have default values, but allow the user to modify them as you wish via one of the events.

  When I first implemented this application, I used the comment nodes and it seemed to work ok, but as the application to expand I came across a problem where the values have been reset after each event.  I thought that maybe the Globals would get around that, so I changed the structure to look like in the attached code (photo for those who do not LV7.1).  However, now the problem is that the value change event does not actually change the values-, they will reset back to default values each time.

  Someone at - it suggestions on how to fix this (or a better way to apply it)?

  Thank you!

  Michael Tracy
  Synergy microwave

  Well, of course things get back to default values. You do not pass the new values for your Subvi SetNums, so it can only display the default values the next time, it's called. The use of globals does nothing. Here is a picture of how the main VI and Subvi can be rewritten. I can't post them as 7.1.

• structure of the event with a local variable

  Hello world... I tried to make a simple program with the structure of the event in Labview.
  I need to show a value in a table, when an external signal changes its value. (I read a lot of discussions and many documents and I don't understand the thing... Sorry)
  I want to say that I am getting a value of temperature of a sensor in a controller, it works in asynchronous mode sensor, so that the detector Gets a new value in different sampling rate.
  So the PLC program changes the State of a Boolean variable simple that in Labview, indicates that there is new data (newdatareceived---> 1,0,1,0,1,0...)
  I need this draw Labview (valuereceived) value in a chart when this variable (newdatarecived) changes.
  My problem is that the table always puts a value according to the cycle time in its loop and resumes the values... (I tried, with dynamic events and signage value... and I got the same result... It works fine).
  Thanks in advance.

  And the other way:

  

  Thanks for your time again.

  STPG wrote:

  I've been doing a little test with xygraph and the example works now (thanks!) but I have a doubt, is this the right way or is there a better way?

  No, this code is meaningless. You write new (mostly the same!) points to the graph xy with each iteration (actually at twice the speed at which data can actually happen: 100 ms vs 200ms!), tax system unecessarily and more internal data structures like crazy.

  All you need is a simple loop with a single structure of matter which is true if the Boolean value is different from the previous iteration. Currently, you must add a point (the time for X, the value in Y) to the xy graph. Here is a quick sketch. (You can either use the meter or the elapsed time for X, according to your needs, so change if necessary).

  Events are mainly for the interaction with the user in order to avoid the loop turn unless necessary. Here you are already running a loop to interrogate the instrument and you can easily have the graphic way the same loop. Right?

  You should also be aware that the execution order is determined by the flow of data and not in a horizontal position. If it's important that OCX nodes running first in an iteration, you create a dependency of data (for example with the wire of the error). Horizontal compensation has no effect. The structure of sequence on the left has also does no work, then why is it there?

• Structure of the matter and structure of the event with a condition of the indicator (boolean)

  Hello

  I read a lot of posts but I can't solve my problem. I would like to set up a business structure and the structure of the event, and the condition to run the code inside is a Boolean indicator, in this case called Wahnelt (screenshot). I know I should use signal value, but I don't know how to implement. Here is the program:

  

  Any help will be more thankful

  a state machine with timer elapsed...

• Structure of the event with gray and disabled controls

  I'm working on a data acquisition program that uses the structure of the event to manage the graphic user interface.  I have a 'start logging' button that raises an event when the value changes and starts to collect data.  While collecting data, the program disables and gray on all controls on the front panel except the button "stop logging" that ends a while loop with in the event of data logging.  If this event is active only when you press "stop recording."  There are other events that are triggered by a mouse up/down, action others controls disabled on the front panel.  The problem is that, while the program collect data if you click on one controls disabled and gray that has a mouse up/down, event, the program seems to hang and will not push the button ' stop logging.  I don't know if his attempts to run another event, but he continues to logging data, I just can't stop it.  I have to use the Cancel button to stop the program.

  The real problem is that a control, even when disabled and grayed out, can still trigger a mouse to the high-low event - controlled, it true?  Also, what happens if an event is raised during execution, another event my understanding was that a single event can run at a time.

  Thank you

  Doug

  Doug,

  By reading between the lines, here a bit...  Looks like you have your data collection and logging code in the box to Start Logging event.  If so, this is part of the problem.  No other case of event cannot run until this one is over.  Move data collection and the registration code to a parallel loop.  Have this loop to sit in an inactive state until you press the Start Logging button.  Then, in case for the button change send a command via a queue to the loop of logging and out the case of the event.  The event loop is then immediately ready to respond to the next event.

  Generally the code within a case of event should run quickly, no more than 10s of milliseconds for maybe 100 ms to avoid slow response to another event.

  Look at the producer/consumer (events) design pattern which comes with LV for an example.

  Lynn

• Control the Structure of the event with text file

  I'm new relativaly in LabVIEW (experience only about 2 weeks). I am currently control a stepper motor using a structure of the event. Similar to the sample code given by LIFA, I entered my settings how the engine not move away, then press a button on the windows before, and it works this way. I also have other equipment that works as well in LabVIEW, as a transnational step; all components operate individually.

  Now, I'm trying to make the more automated system and to ensure that all the different equipment work in the same code. So, I tried to implement a structure of the event using a text as an input file to try to control events. The text file has a table 1 d of numbers going down vertically (only the line numbers change). So, I used a table of index function to take the numbers one by one, use a loop (while loop in this example) to go to the bottom of the column of numbers. However, the event not register the change, even if the indicator shows the value is changing.

  Attached, it's my test code and the text file that I use to try to control the structure of the event. Please let me know what I am doing wrong. Thank you.

  Oh, now I understand what you tried to say. I'm using a loop and a case structure to activate different events with the entries in the table. I thought case structures and event were the same, but you taught me the event structures are used just for the façade stuff. Thank you all!

• How to manage the structure of the event with two loops

  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.

  

  

  

  super_saiyans wrote:

  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.

• 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.

• Instead of using the structure of the event with the producer consumer?

  I used the architecture of producer-consumer in the past to control a state machine with the structures of the event.  I'm working now with the basic version of LV that does not include the structure of the event.  Can anyone recommend alternatives to the use of the same architecture in this case?  Thank you, David

  Before the introduction of the structure of the event, the only option was the election.  Control terminals are in a time loop (the producer) with shift registers and a wait, usually about 100ms.  At each iteration of the loop, the control's current value is compared to the previous value.  If it has changed, and then take appropriate action.  Andrey suggested, queues are a good way to pass information between the loops.

  It works for the equivalent of the value change events.  Things like mouse to top or filter events were much more difficult or not possible.

  Lynn

• 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.

• Can I use Ctlref in a structure of the event with a mouse to an event?

  I have a large number of controls on a front panel. I use a structure of the event that triggers the movement of a given motor when you press the corresponding button. However, I would like to avoid creating events for identical most of N, so I relied on the use of a mouse down on the front panel event, then retrieve the reference command using the Ctlref node (with gives 'Reference to the control on which the event occurred', according to manual labview) and analyze an array of references to know which engine is supposed to move. However, it seems that this node is not (contrary to what the manual said).

  I found other ways to do what I need (I thought using a table containing details of my controls and the coords in the structure of the event node), but I wanted to know why I can't find this node (that is displayed for the event "value change" for example). I'm using Labview 2013.

  No luck for you. Mouse down on the Panel does not have the refnum control because it does not work on a control. Mouse down on a control has it, and since you can configure the mouse down events on multiple controls in the same case of event, it also provides a refnum of control so that you can still use the order in question.

  This is probably also the question that Jeff might have seen. When you set up multiple events for the same frame that LabVIEW displays only the terminal event that are present in all of these events. Terminals that do not exist in at least a specific event of the multiple events for this image are more selectable.

• Structure of the event with sub-panels

  Hi, I tried to find a simple example with a structure of the event and only two sub-panels.

  I found the 'new Event Handler.vi' and I'm doing something with two sub - vi I did 'Add.vi' and 'Mul.vi '.

  To be able to switch between the two sub-panels used in 'New Event Handler.vi', the programmer used a "time surge" which I can't locate

  anywhere, so I just copied 'new Event Handler.vi '.

  I can't get this to work.

  Take a peek inside the world

  Sincere greetings,

  Lasse

  Hi Lasse,

  Yes, there is. If you open the properties of the subVIs Add.vi and Mul.vi (Ctrl + I), you can change in the tab 'appearance of the window' to that custom... There is an option display front panel, when it is called and the close later while initially closed just sellect them. Then, you will have the effect of 'pop up' :-)

  I slightly changed the example, so that can see them in the form of pop-up windows.

  See you soon

  Angel

• Can I activate a structure of the event with an another VI control

  I need activate an event structure in a VI with a change of value with an another VI control event. The code is included in the pictures, you can see in this post, and the variable stop is the control that should activate the structure of the event since another VI.

  .

  The code is on other forums of discurssion and is made by Randall Pursley (rpursley8).

  See the link: http://forums.ni.com/ni/board/message?board.id=250&thread.id=43960

  kiftren wrote:

  Hi to determine,

  Sorry, I can´t to open your archives because I use LabVIEW 8.2 and LabVIEW 8.5. Can you give me the image of the code in your screen in one archive .jpeg?

  Thank your for your help to determine.

• Cannot transfer messages saved in the journal of the events with the 50 State

  I use Vista 64 on a HP laptop.   I don't have a Vista installation CD but have the cd hp the only way I can run CHKDSK with Windows running is to use the F8 key and select 'Repair your computer' then I get to the screen "System Recovery Options" and a "Command Prompt" option that I chose.  I can then enter "chkdsk" and it works, but after it runs I get an error "cannot transfer the recorded messages in the log of events with State 50 ' although he reported no problems with the disk.  It is this important error message and how do I get the chkdsk to write the information?

  I talked to HP and they tell me I have to reinstall the original software included with the computer to resolve this problem.

  Any help would be appreciated.
  Marshall

  Judd

  Thanks again for your information.  It seems that you agree with HP that the only way to solve this problem is to re - install the operating system.  This tells me that the re - install has a good chance to solve the problem.

  Best wishes
  Marshall

• Unable to open programs without the 'Open with' window popping up.

  Whenever I click on a desktop icon or anything in the menu start, the 'Open with' window opens. I can't check the box "always use this to open these types of programs. This hinders my ability to get for some programs, because I can not find them when I click on "Browse".

  Someone knows how to fix this?

  Whenever I click on a desktop icon or anything in the menu start, the 'Open with' window opens. I can't check the box "always use this to open these types of programs. This hinders my ability to get for some programs, because I can not find them when I click on "Browse".

  Someone knows how to fix this?

  Open this link below, go to the answer given by Phantom 010:
  http://forums.techguy.org/Windows-Vista/899995-solved-Open-box-opens-every.html
  t-4-2