Why LabVIEW generates - 0?

Similar Questions

• Why Labview allows a cursor in an indicator?

  Hello

  Why Labview allows the user to position the cursor with the mouse within a digital indicator? The user to believe that just because they can put a slider they should be able to type something and enter data. Is there a way to disable/stop the user to place the cursor in a digital indicator?

  Kaspar says:

  Hello

  Why Labview allows the user to position the cursor with the mouse within a digital indicator? The user to believe that just because they can put a slider they should be able to type something and enter data. Is there a way todisable/Stop the user to place the cursor in a digital indicator?

  Advanced right-click > Enabled States > disabled

  Ben

• Why LabVIEW jump commands in programming structures

  Hi all!

  Is there a way you program it to do run all THE commands in a loop before entering another loop of labview? For example, I have some time who stops in a loop if either the stop button or if the entry of setpoint is greater than 8. If these two are false, then the code entered in a business structure where it controls the output of a model factory. However, labview will enter the business structure without checking if two conditions are met. I have attached the VI and in the next message will display the screw of the plant. I want the code below,

  IF (> 8 OR set Point set Point< 0)="">

  SET_Point OK = False

  On the other

  SET_Point OK = True

  END IF

  IF (OK SET_Point = FALSE or Stop push button) THEN

  ! STOP THE VI

  ON THE OTHER

  ! Enter the PID control loop

  END IF

  But labview just like jumping and skip some parts for a reason any. So when he ignores for example, verification of GOLD, it uses the default value true for the next case structure. It drives me crazy. Can someone please tell me why its doing this?

  Thank you.

  
  

• Why labview load screw exe instead of vi.lib?

  Hello

  I have a small but annoying problem.

  My project called an exe that we created using labview. In the project folder, there is the folder "SpectrumAnalyzer' with 'Spectrumanalyzer.exe '. Whenever I open my project, Labview is conflicted on the same screws 4 and wonder would be - it to load them from vi.lib or SpectrumAnalyzer.exe (screenshot attached). Why would he do that? How can I tell labview does not to load the exe witthin screws?

  Thank you

  Danielle

  
  

• Why LabVIEW example projects using Global Variables?

  I'm puzzled.  I've been pretty good programmers LabVIEW talks (including some who work for the OR) and came away with the impression that Global Variables should, as a general rule, be avoided, with functional Global Variables (alias VI Globals) generally preferred for "local memory".

  I have studied some of the example distributed with LabVIEW, 2012 and 2013, in particular the proposed acquisition in real time and am struck by the use of Global Variables, where I'd be inclined to use instead a FGV.  For examples, to stop all the loops on the RT target, the overall "All the RT loop Stop" is defined; 'Constants' of configuration (such as timeouts, Streme network names, the names of the journal folder) are kept as Globals; Streme network endpoints are stored in Globals.

  [Note - there is a weird spelling of the second word of the network Streme, above - when I tried to post with the correct spelling, I got an error message saying this word is 'not allowed in this community".]  I apologize for the offense, but I must confess that I do not understand what the problem with the help of the spelling of this word...]

  Why use Globals in these cases, rather than write a bunch of VIGs to hold these data?  Note that almost all these Globals are 'Read' essentially (written once when a resource is acquired, for example) or "Read Only" (treated as if they were a constant).  Indeed, read-only variables can be written as a Subvi with only an output terminal, acting as a (visible, due to the icon) constant.

  I can see advantages to this approach.  On the one hand, VIGs can have error bounds who run the data flow (I just spotted a bug "data flow" in code, I am developing that is based on this model, to read configuration data to an XML file in a world and in the same VI, Global wiring to a "use - me" terminal, but with no guarantee that I'll read the overall after I write it).

  It is, I suppose, a matter of 'speed' - perhaps Global Variables are 'faster' than VIGs (especially if the VIG 'sits' on an error line).  My thought, however, is that this difference is likely to be trivial, especially as these VIGs (or Globals) tend to become "occasional" calls (with the exception of the indicator 'all the loop Stop' which is called once per line).

  Are there other arguments or considerations that make a Variable global to a better choice than a VIG?  Is there a reason that LabVIEW developers put in these start-up of projects LabVIEW?

  BS

  I have to ask, how do you use functional Global Variables?  Like just a Get and Set?  If so, you can use a global variable.

  Yes, globals are faster and use much less overhead.  At the summits of CLA in recent years, we talked about using globals.  The most common use is for Write-Once-Read Many and writing-never-Read Many with configuration data.  It's a good idea to use globals with the constants that can change on you.  It turns out that the world will have the same performance as a constant in this case.  This is done so that you don't have 1 place to edit the 'constant '.

  The rule on "Globals are evil" actually goes back several years when NEITHER had the huge "people of the country are bad" vendata.  But NEITHER explains well how to do things properly.  So I found people, instead of using local variables, using the value property node.  It's even worse because the property causes thread swaps and kills your performance.  It wasn't until I shouted to people to use wires and shift registers I have seen improvements in the way in which people wrote their code.  So people are always riffling in the use of globals and decided to use FGVs with the EEG and fixed rather cases.  But this does not solve the problem of the conditions of race with critical data and you cause an additional burden.

  So from my experience, I use globals all the time for configuration data.  Yes, you must be careful about the race conditions.  But as long as you understand that it is a common and useful practice.

  I would not use a global variable for data that are constantly changing (use registers to offset or Action motor) and/or processes that have critical sections of code (use a motor of Action).

  NOTE: I use the definition of Mercer to FGV (a Get/Set only) and motor Action (many cases which specifically affect the data).

• Why all generated Cache PDT?

  I learn FCPX and found that it generates a lot of files in my external hard drive. Everytime I open a clip and convenient editing I get more cases. It seems that some of them become great (attached). These are needed to keep?

  And media Proxy? If I'm done with a project can I just trash them?

  Thank you very much, Andy

  

  Untitled is the name of the default library. At one point rather than open this library, you have opened a backup that has a date/time stamp. You then processed for work in the backup library, which then created a new folder for the backup library updated with another stamp of time attached to it, and then you open a backup of this library, which has created another set of libraries of backup with several date/time stamps and so on.

  Your way of that work is to open the library you want to work, and you keep opening the library and only this library and not a backup except if there is a problem. Normally, you open the backup application and not in the backups folder, which maintains the correct naming convention. If you do, you open a backup from the Finder you change its name and remove the date/time stamp and continue with a new set of backups. This should be a very rare event.

  Yes, you can trash the proxy and ProRes files after the end of the project.

• Function wait (ms) in labview generator of the web user interface

  The wait (ms) function in the LabVIEW web UI Builder includes the processing time?

  Hi Laurent,.

  I think that your question asks if the wait (SM) will block the processor. In labview and webUI function does not block the rest of the code to run. You can make a structure as shown below to see this:

  

  You will see that if 'Waiting time' is greater than 'Lead time' the loop speed will be limited by the time "wait" and vice versa.

  Does that answer your question

• Why Labview block when you switch one application of TestStand to another?

  I have several 2013 TestStand applications that use a number of LabView 2013 screws on a test computer.  When the driver leaves a TestStand program and opens another often Labview does not close properly and therefore what TestStand tries to load the LabView VIs, it is caught or pass just and fails every test that is affected by LabView.  The only potential problems I know are that two of the applications have been created in LabView 2009 and then updated to 2013.  Then two other TestStand created applications in 2013 use the function 'UnloadAllModules '.

  Are there known issues with LabView 2013 causing it or ideas of what I could do wrong?

  Hello Michael,

  I found my problem.  In my case a VI don't was get closed in cleaning because of the previous command don't failed Manager correctly.  This VI would remain open and when I ran another TestStand sequence, when he tried to load that LabView VI he would just stroll.  But the result of this error could be seen when I closed TestStand and LabView are left open (since it was frozen) or execute the sequence and its closure.  So if you tried to LabView pop - up it wouldn't show the start start screen because it had frozen.

  I found the problem by activating the option view the façade VI in TestStand for all calls of VI.  The VI that remained open was the problem VI.

  Thanks to all who responded to your help!

  Kurtus

• Why Labview runtime is not backward compatible?

  Hello

  I tried to run a Labview program compiled by a license for Labview 32-bit 2013 on a 64-bit Windows PC with 64 bits 2014 runtime engine. Unfortunately, there no law and required me to install a 32 bit Runtine engine in 2013.

  I thought that if a PC is 64-bit, so I need 64-bit runtime. Isn't this correct? And it's true that a computer that is running the executable files must have the exact same runtime engine version than what they have been compiled from?

  Is a minor thought, likely that a labview program can run "differently" on different versions for the engine? say, flatten to a string for examples...

  You need the version of the runtime that corresponds to the version of the development system used to build the application. This includes the number of bits (32 / 64-bit). Because you can run a LabVIEW application with a version of the execution engine - one that has been used for development - there is no reason to ask if it would be different on different execution engines, since it can happen. This said, OR try not to disturb the operation of functions between versions, and when these changes are inevitable, they are generally and there is often an option to use the old format (some functions have right-click options to be compatible with older versions).

  Windows is a special feature, called Windows on Windows (WoW), which allows 32-bit applications run on a 64-bit system. Without this, you would be able to run 64-bit applications. WoW does not, however, a 32-bit application load 64-bit libraries (with the exception of system libraries which WoW to operate). The runtime engine is essentially a set of support libraries. Your 32-bit application cannot load 64-bit runtime libraries (they don't agree on the size of a pointer, that does not pass data to reliably), so you need the 32-bit execution engine. Similarly, if you have built your application by using the 64-bit development environment, you wouldn't be able to run it in 32-bit runtime.

• Why labview build program does not directly work on the laptop

  We have created a labview program to run our test bench.  It works very well when things are plugged into the program were made on the desktop.  However, when we do a 'construction site' to be able to run it on a laptop it does not work.  I installed the latest drivers, the labview runtime error and the hotfix package.  It still does not work.  What is missing?

  
  

• Why LabVIEW 2012 does not support USB-6009?

  Hi all

  I recently installed LabVIEW 2012 and DAQmx 9.6 (and also tried with latest version) in my PC with Windows 7. I have the version of Explorer 5.4 measure and automation. I'm working with hardware DAQ USB 6009. Everything seems compatible, but when I try to post data acquisition, it fails. However, I used to use this device (since I bought it last year) with the other PC that has the Windows XP operating system and the older version of LabVIEW 8.5.

  What can I do with LabVIEW 2012 is a message "a 88302 error has occurred." and "This could be an internal error."

  If someone has an idea to solve the problem, please let me know.

  devkotaj

  Hi devkotaj,

  The USB-6009 device should work perfectly on Windows 7 with the software you have listed. This looks like a problem of configuraiton of material for me.

  What are you trying to do when you receive the error 88302? This error usually indicates a corrupt DAQmx driver, which may result from the installation of several DAQmx versions on the same machine. Have you tried repairing your installation DAQmx? I could uninstall DAQmx from the Control Panel before installing the latest driver. You can see our procedure to reinstall or uninstall recommenedd here.

  I hope this helps!

  Andy C.

  Engineering applications

  National Instruments

• Why Labview crash when I try to use a joystick?

  I'm reading a Logic3 USB gamepad gamepad in Labview.

  Whenever I try to run any of the VI in ' Functions/connectivity/Input device' (IE access HID as keyboard/mouse/joystick through direct x) then Labview either crashes or I get the error message:

  -2000000008

  ERR_INVALIDDEVICEINDEX
  Please check if the device is properly connected. Please make sure the deviceIndex passed to initDevice.vi is correct.

  I have a new windows 7 (64-bit) PC with x 11 direct runs Labview 2009 and until recently, I was running Labview 8.6 on my old windows xp 32-bit pc and these VI has worked well.

  I know that x 11 direct sees the connected joystick I checked via the command run "dxdiag".

  Please help - thanks

  You cannot access a DLL 64 bit from a 32-bit process, and vice versa. Actually, in the other direction, it is possible via a workaround solution that involves communication interprocessue, but this is an advanced topic.

  Remember that you can install LabVIEW 64 bits for your specific version of LabVIEW. The license allows you to run the 64-bit or 32-bit. LabVIEW 2009 64-bit was not on the DVD, but you can download it from the site of NOR.

• Why labview programmers use 10.1 the default frequency instead of a same 10.0 Hz?

  It was an issue that was raised during the lab class and no one has an answer for.  Any ideas?

  I call it the wagon wheel effect.

  In the old westerns, whenever a wagon with a Ferris wheel to rays rode by the camera, sometimes the wheel would look like it rolls slowly forward, sometimes slowly propagated backwards, sometimes it would look as if it was stopped.

  It is a function of the frame rate of the camera over the period of the cycle of the spokes of the wheel.  If we spoke (or more) offers exactly the right distance between a frame of the movie and the next, it would look like the wheel had not moved at all.  If he moved a little further than the distance from rotation of we talked, it would look like it rolls slowly forward.  If the cart is a little slower, then it would move only less than the distance of a spoke and he would look like the wheel rolls backward.

  Same thing with having a periodic waveform (every bump of the sine wave is a spoke of the wheel) and a number of acquisition of samples and data rate equal to a whole number of this period (essentially the frame rate of the camera.)  Wagon wheel always rolls forward.  The sine wave is still oscillating.  But according to the rate of acquisition compared to the wave sinusoidal frequency gives a different appearance to the appearance of this sine wave on the chart.

  Experiment and give it a 9.9 Hz sinusoid, you will see that it seems to move backward.

  So I think (and this is only a guess) is that whoever designed the express VI gave it a default value of 10.1 Hz to visually simulate on the graph of the sine wave motion.

  It doesn't really matter what they chose by default as it is to you that the programmer LabVIEW to change this default setting (whether in the express VI or the wiring in a value) to something that makes sense for your application.

• Do not understand why photoshop generates these lines on my files

  

  This opening with another program image is fine, but when you open in photoshop, it creates this strange lines (blue or magenta) such as the file has been corrupted, but im is not safe.
  I tried to open the document with older versions of photoshop and it's fine.
  I have a cs6 and don't understant why this is happening and how to fix...

  Please help me out... shell I have reinstall the suite together?

  Hi ritmospa,

  Open PS and in preferences - performance uncheck the option that says CPU graph use, then restart the Psalm

  Concerning

  Rohit

• Why Labview takes 8 bits to represent a Boolean?

  Since it may take only one of the two values, can there not be represented by a bit?

  The smallest unit of memory controllers is a byte, and reading from memory is 32-bit both, so there is no advantage to using a single bit. If you use a large number of bits, you can hide them in an I32 which is done often for example c.

  /Y