Is there a tutorial for creating executables in real-time?

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• Is the module vision development in labview 8.6. sufficient for acquiring images in real time and analysis using a webcam

  Hello

  I'm new to labview and trying to develop a system of eye tracking using labview 8.6. He has the vision development module, and I was wondering if this was not enough for the treatment and real-time image acquisition or could I need other software tools.

  Yes, to acquire images from a webcam, you need drivers imaq-dx.

  Take a look at this link:

  http://digital.NI.com/public.nsf/allkb/0564022DAFF513D2862579490057D42E

  Best regards

  K

• For a sequence in real-time output variable

  VS 2011, I have a sequence of real-time voltage step that sets an AO for a voltage given for awhile, and then resets the output to 0.

  Just before setting the output to 0, I want to read the response of my this stimulus of an AI System I call StepResponse. To do this, I place this in FinalValue I set as a Variable in my script. In other words, it is a parameter or a local Variable.

  Now, how can I get this out FinalValue? I don't see anything on how to "test" this variable to one of my user variable... I was able to do with the stimulus inherited in VS2010 Editor. Now, I'm stumped.

  Here is the sequence:

  

  and this is the profile of stimulus and settings below. I can set the fine settings via the API of LV, or run the Publisher of the Stimulus. But I can't seem to get out this FinalValue...

  

  THX.

  L.

  The return for a sequence (in your case FinalValue) variable is returned to the caller once the sequence has been completed as a result of this sequence. In your example, the appellant is stimulus profile that you configured. In a profile of stimulus, two relevant things will come based on the return value of variable a sequence called:

  1. The return variable value will be get recorded in the file of test result ATML for stimulus profile
  
  
  2. You can configure an assessment of output for the call to test sequence make a basic on the return variable test to determine a pass/fail result. For a numeric variable to return such as FinalValue, you can do a check of numerical limits to test whether the value is in or out of the specified limits. For a Boolean return value, you can translate either directly in a pass/fail result, or you can reverse the logic as well as False implies Pass.

  In addition, the LabVIEW API has a function, you can call once the sequence finished to programmatically retrieve the return value.

  However, in your sequence after that you store the value StepResponse in the return variable, you reset to zero before the end of the sequence. If your sequence always returns zero. I think that you do not remove this line and let FinalValue what so that you will get the StepResponse back closure instead of zero value.

• Create logs in real-time after poweroff vms

  I create script poweroff mV. I would record in real time in an excel or html file which were poweroff vms to follow. Is possible?

  I think you'd better examine the events to get the start and stop times, i.e. the events of ignition and extinction.

  The following will give you a list of these events in the last 10 days

  $events = get-VIEvent-start (Get-Date).adddays(-10) |

  where {$_-is [VMware.Vim.VmPoweredOnEvent] - or $_-is [VMware.Vim.VmPoweredOnEvent]} |

  Group-object - property {$_.} Vm.Name} | %{

  $_. Group | Select @{N = "VMname"; E={$_. Vm.Name}},

  @{N = "Createduserid"; E={$_. Createduserid}},

  @{N = 'Action'; {E = {if ($_-is [VMware.Vim.VmPoweredOnEvent]) {'Poweron'} else {'Poweroff'}}},

  @{N = 'User'; E={$_. User name}}

  }

  $events | Export-Csv "C:\VM-power.csv" - NoTypeInformation - UseCulture

• Shared variable of subjects with the executable in real-time

  We have a PXi target running Labview time real 8.5 and we use a series of shared variables for communication between the target and the client software. The code was developed (and used) in the last 2 years, and presented no problems with the shared variables when they are deployed since the Project Explorer (for the target and the laptop based client software). However, when you try to run an executable version on the system time PXI real target of exactly the same engine code variable shared seems to fail during the initial loading. Since it is an executable, it is difficult to display errors, but it seems that the accident occurred at the beginning of the program when we try to initialize a number of shared variables. Sometimes it loads but probably only 10% of the time. When you plug the tool to debug for code and restarting the executable, runs without any problem. However, once we managed to capture and error (error-1950678982 the shared variable client side read buffer is full).

  I checked a number of messages in the Knowledge Base (e.g. how to deploy Variables of a compiled executable shared network?), but it still has not solved the problem. Thoughts and suggestions?

  Adrian

  I tested it for a few hours now and I can't make it fail again. The big difference in my implementation was to use your suggestion, and no wire the error cluster through the method since the error it generates caused a number of questions later. So let me summarize the final configuration that seems to work then:

  -during the execution and executable on a target time real 8.5, startup not connected to a client. Library of shared variable hosted on the target and should load by itself.

  -J' added a flat structure sequence on the vi 'main' (top of page vi executable) with a node (as shown above) Invoke method in the first structure with a timer to 10 seconds and the rest of the code in the second part of the structure. The shared variable library has been copied to the target in a data directory and the path provided to the method (the same way as above) and the IP address is that of the target.

  I discovered that it takes about 8-9 seconds for the shared variable engine and library to start (I don't remember is that past exactly that) and it is important to wait this time to initialize shared variables or the behavior is unpredictable. The method always generates the error 1043 (function not supported) but I simply ignore it now, and it seems to work.

  Thanks for your help! I will let you know if there is some instability in the future, but everything looks good from here.

• Create a shared library for NI Linux real-time

  I need to build a shared library for NI Linux time real (.so) which corresponds to a shared library, which I create on Windows (.dll).

  I have the C code that needs to call a function of VI. On Windows, I have a project that allows me to create and build a "Shared Library (DLL)", but I don't see the same option available in a real-time project targeting the cRIO-9068. Am I missing something, or is it not still possible?

  Hi Wayne,

  Using LabVIEW VIs in other programming only possible through dll environments. In LabVIEW there are options for creating libraries and source, but these distributions will be accessible in LabVIEW and not in other programming environments.

  Concerning

• API for creating value

  Hello
  
  Is there an API for creating value and the value of values in R12?
  
  
  Thank you
  Praveen
  
  Published by: praveen Elvis on April 9, 2009 12:18 AM

  Hello

  Try FND_FLEX_VALUES_PKG API.

  Oracle integration repository
  http://IREP.Oracle.com

  R12, repository integration Oracle is shipped as part of the E-Business Suite (as a responsibility).

  Kind regards
  Hussein

• Abnormal behavior observed in real-time executable.

  Hello

  I have an interesting problem. I have developed an embedded application of Real-time/FPGA for cRIO 9024 and come across a problem that I don't understand. I work FPGA and RT of top-level and subVIs, proven individually and together when it is run interactively. When I create and deploy an executable in real-time like start, however, the behavior changes. I posted the code below, which I'll explain briefly:

  I have a state machine with 5 States architecture. "Initialize" and "Shut Down" are exactly meet once whenever the device is reset, and the cycle between them is wait > pre-test > wait > run the Test and repeat as many times as desired. Measures are taken by FPGA and past in real-time by DMA FIFO and are then recorded to the TDMS file by the real time. Everything else is just interface.

  The problem comes from the first time, the program enters the Test case to run. The FPGA send measurements as usual, and they are stored in a growing table updated buffering in the fixed-point shift register shown below.

  

  Run interactively, this method successfully bed, buffers, sorts and writes all data in the file. However, in time real executable, only the data collected in the first round (147 items total, as it is initialized by the whole shift register) are saved, the rest seems remainsin a buffer? before calling the following function TDMS write, is that in the case before the next test.

  I'm unable to debug the executable file in real time, probably because of the FPGA reference or some other schema components. I tried to replace the pad with a FIFO in real-time, a variable shared with RT FIFO active and tried to write inside the loop. The FIFO are not improving the situation, and when writing inside the loop, the loop does not run quite fast to stand.

  The problem does not exist when I run the VI interactively from my computer, only when I try to deploy all of the embedded, any application that works (as far as I know) except this one place.

  Any ideas to solve, or workarounds?

  Ryan

  Technical support helped me to resolve the problem, the early termination of loop caused loop condition, although I still don't understand why the behavior was different as an executable file, because the condition of the loop has worked in interactive mode, so if someone has any ideas as to the why, I would still like to know.

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  Switch to Design view.  See screenshot.

  

  Nancy O.

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  If you want a good quality of the exercise files get a subscription to Lynda.com.

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