Icons VISA local Variable or write?

Similar Questions

• stage of statement do not write to the local variable

  I have a 2 local variables that are custom data, type, a container with 2 numbers u64, I am trying to assign numbers of these variables by using the stage of the statement, but variables do not change, here's my statement:

  Locals.excelStartColRow.Column is 1ui64,
  Locals.excelEndColRow.Column is 3ui64

  I don't get any errors, but the values not updated so the VI I use these variables by fails, any ideas?

  == is a comparison.  You want to set a value, that is =

• Write to the faster local variable in 2010?

  I remember a demo of LabVIEW classes which compared to the speed of writing directly to an indicator compared to a local variable and the property node.

  I thought that writing to a local variable has been very slow compared to writing to a terminal. There is no difference that I see with 2010. Maybe I'm not remembering correctly but I know that the gurus OR did a lot of performance optimizations.

  I have more 2009. A person of 2009 or an earlier version can tell me what's the difference in speed between writing to a terminal in the attached vi vs local?

  OR put in place a dorr back to allow the local update quickly. Not as fast as the terminal but fast.

  The draw on the spell-back cmoes in force when you have multiple.

  If you have a large table, you update (big table will make it easier to reference) and there are 20 places that read through local, then the dat should be copied in other residents.

  Ben

• Using local variables to 'clean up' diagram

  I have attached a photo with red circles indicating my use of local variables to 'clean up' a block diagram. If I meet problems this? I leave this task and the unwired error?

  -Sarah

  I see a few maybe really bad race with your VISA resources conditions.  For example, if the task on 3 is empty (default), it is likely that the local read will happen before the local write.  What this will turn into is lose you your reference VISA in the register shift.  Use threads.  Locals clean up very rarely in your diagram.

• Change local variable boolian Programaticaly

  Hi all

  I came across something today, that I have ever dealt with in Labview...

  I downloaded a driver of instrument for a power supply, and got it working OK (using VISA on the USB communication).

  The example program pilot itself works very well and is a quasi State machine.  It it turns on and off and adjusts the voltage and current correctly, as it should.

  Then I need to edit the .VI to add a time on another timer .VI.  I wrote that the small simple VI and it works properly as it should.

  It's just a boolian power timer.  Lights at 08:00 daily, stops at noon every day.

  The problem I have is the boolian called variable "Output (T:Enable)" which is located in the .VI power supply example is a Panel button, but it is called several times as a local variable.

  (once again, I did not write this part and please no lectures on why you should never use a local variable...)

  When you change the State of the button "Output (T:Enable)" Panel, the power supply turns on and off as it should.

  The problem comes when I try to control this value boolian using my timer VI.  I've tried several things, and using debug, I can't 'Output (T:Enable)"to change state.

  The value will change ONLY if the button is pressed or not.

  ATTENTION: The illustrated local variable condition is also a security in case of short or overload, power off if the name cannot be changed.

  Is there a way I can trigger "Output (T:Enable)" using 'My exit timer' but always make sure that stop you it if there is a short circuit?

  This left me speechless... I tried several different things and just can not understand.  Any help would be appreciated.

  

  Thank you!

  The guy

  Hello guy!

  You are not sure, I understand the problem in its full extent, but I'm guessing that you want to trigger the event that controls the output (T: Enable)? If you want to programmatically, create a node of the control property and use the property "value (follow the signs). Writing of a local variable will not draw the event, although this will change the value of the façade.

• Why flatten data chain not getting past all about TestStand via a local variable of the string?

  I tried to go around a series of data in TestStand as a string using "flattened chain" of LabVIEW. When I create a local variable in TestStand of type 'string' and try to write the cluster flattened at this that he simply not transmitted. If I convert the string flat binary table and then pass it around, I can recover all the data very well.

  Is there something I'm missing here?

  I've attached an example Teststand sequence that illustrates this problem. If you run this sequence that the 1st test will fail, which is the attempt to simply pass the flattened string data structure and the 2nd test will pass as it is the binary table that I generated from the flattened string.

  Thank you

  Pete

  crossrulz is correct.  The Null character affects how TestStand handles the string.  You will need to specify the string to a binary string in the list of settings both the VI.  TestStand then encodes the stringso it can prevent the loss of data.

  If you need work on the binary string in TestStand, you will need to convert it to an array of raw data with PropertyObject.GetValBinary.

  

• How to find the steps associated with a local variable?

  In a sequence, we have to write or read from a local variable. Is it possible (for example right-click the variable) to find out related measures?

  Thank you!

  Are you talking about discover what steps use the local variable.  Because the measures are not really "related" variables.  Either they are or they aren't.

  You can use the search/replace tool.  Edit > find/replace

  In the look for:, enter inhabitants.

  You can check her search for: box, and then select the order in which you want to search.  This should show you a list of all instances of the local variable.

  Hope this helps,

• Code to skip the steps: initialization of local variables failed

  Hi all

  I'm upgrading some software LabVIEW RT I inherited LabVIEW 2011 to 2015 LabVIEW (32-bit) on a host Windows 7 Professional PC. The target is an SMU-8135. The software ran well when it is compiled under LabVIEW 2011.

  I modified the code to enable the monitoring of what is happening by looking at screen on the target outputs. The initial error that brought me here is that a local cluster variable initialized in the first window of the flat sequence described below have been appearing as the in windows later.

  The code begins with the initialization of local variables in the first window of a flat sequence and provides a quick line of text output to the display of the target (call this text #1) (using RT Debug String.vi) I send two lines of text so that a new row is created and later text does not replace it. . It then writes to the next window in the sequence flat screen two groups of text output to the target. Second text in the window 2 (#3 text) output is equipped with a wire entry from the error from the first text output in the second window (text #2). That is the second exit must wait for the first exit to complete before being sent to the screen.

  I see now some weird symptoms:

  1. when I connect to the target under a remote debugging session I see expected display outputs. Not remotely connected, text #2 is displayed. The code passes to the third window in the flat sequence, so everything in the two window should have executed.

  2. the text #1 appears on the target screen * before * I get the message "Welcome to LabVIEW Real-time 15.0." Is this normal? Whence this message? I searched my screws and subvis to this text and it is not there then it mucst come LabVIEW screws somehow.

  This all started with local variables no initialization in the first window, so apparently, I have a problem of data flow. Given that the problem disappears under the remote debugging, I'm a bit of a loss.

  Thanks in advance for any help,

  Eamonn McKernan

  EamonnMcKernan wrote:

  Text 2 appears only when remotely connected it does not appear when running at startup.

  Your "text 2" seems to be powered by a collection of nodes comments to "initialize on compile or load.  This will return once the empty string the first and therefore should not be display nothing until the code I run a second time.  That is the crux of feedback for?

• default local variable

  Hello

  Just a quick question for out me of a hole... I use a local variable to control while loops, and based on a counter value, he makes it or not. When I probe the effective Boolean value, it can't be exectuted, but the value of the local flag is true? is it possible to change this? I need to stay wrong, until it is true!

  See you soon

  Peter

  newbie09 wrote:

  Rich,

  Any quick way to write code to initialize variables, withour reset the entire program?

  Rgds

  Peter

• Shift register to replace local variables

  Hello

  I'm looking for a way to make a marquee on a Boolean LED. Currently, I use a local variable to make the scrolling action (see the code, the loop For on the right). However, this method requires CPU more power and also prone to several other error. Therefore, can someone help me to replace local variables with shift register? If possible, do not change the other loop. Thank you.

  -l' scrolling action must be continuous

  -use the attached config. file

  -allows to test with any text message

  Why do you think that you need so many loops?

  Try this, perhaps this may give you some ideas...

  (Look at buffer allocations. My table of Boolean 2D works at constant size and completely in place. Not only were constantly read and write to and from the local variables, you were also constantly growing and reducing the size of the table. It's very ineffiicient. I don't see the purpose of your outside while loop or FOR your first loop. None of your shift registers makes a lot of sense. You probably want to close the file of configuration (not shown in my modification)).

• Structure of the event to local variable

  Hello

  I use a control structure and the table event to detect changes in the value of table.

  At the beginning, I have made changes in the table (for execution) and structure of the detected event.

  The next step was adding a parallel while loop in which I write for the control array (using the local variable).

  During execution the layout of the table changed indeed, but the structure of the event is a not detect it.

  I have attached 2 digits: 1) loop of the structure of the event 2) the parallel loop.

  It is possible works in such a way?

  How can I make the structure of the event to detect changes in the software in the control array?

  Thank you

  Leonid

  Changes made via a local variable are not the user events, so the structure of the event will not detect by definition. You must write to the command by using the property node "Value (follow the signs).

  That said, your small watch of your code starts to raise red flags in my mind with the use of variable and global variable local. While it's not bad, their abuse can lead to the poor programming architecture and race conditions. Perhaps you should consider downloading your VI any kind can someone take a look and offer suggestions on improving it.

• Initialize controls/indicators: invoke node-local variables Vales. Which is faster?

  Hi all

  I would like to get the opinion of the people. This thought just happened for me while I was reading some materials the other day.

  And I have not found any topic which talks specifically about speed after searching the forum.

  It is faster to initialize your controls/indicators using Invoke node OR write directly to the initial value of your local variables?

  From my experience (not large), I have always used the invoke node to initialize controls or indicators.

  But when I but this question, I did a simple reference point and it seems the local variable approach is faster, especially

  If you have the large number of orders/lights to initialize.

  Am I missing something here? The invoke node running something that writing a value of local variable would not do?

  I thought since you need to set the initial state by default for the node to invoke anyway, why not just write the desired initial value

  your local variables?

  I would appreciate if someone can express his own opinion based on their experience and knowledge.

  Thank you ~ ~

  I may need another Cup of coffee this morning, you are in fact callling the reset by default on each individual control.  My last despises, it is that you use the default method Vals.Reinitialize VI all failing.  It will probably be a bit faster than the method on individual controls.  Still not instant, if.

  Are a few msec is worth to you?  If so and you consider the local path, my advice is to group as many controls as possible into clusters for minimize you headaches.

• How 'local' are local Variables?

  I avoid local variables at any price so don't have much experence with them. Local only 'local' to the subvi in what they are or if you have used the local variable from sale in several subvi in the same program would be that they all share the same varaible?

  I got the task of determining a LabView program that we had subcontracted out. The device, on which he works has three identical modules that are used for the profile and discharge profiles for different types of batteries. In any case, the program has a bug in it where all three on screen V / I charts show the same V / I have curves.

  My original thought CD was the subcontractor got the program works on a module, then reproduced the code to the other two. But did not take a new graphics or was referencing the V / I module of measure 1 in charts 2 and 3. First glance on the code it looked like it should work fine.

  Digging deeper, I see the contractor makes this sup - vi to build the cluster for a waveform graph. In this sub - vi he used a table variable local, called "local".

  When he repeated this for the other two modules, he used the same variable local "local array. Since all three "programs" (one for each module) operate within a larger loop would not all be read and write to the same variable local "local array?

  I have attached the origonal sub - vi (V_WFM.vi) and one of my replacements (V_Wave_1.vi), I've made three copies of my vi and each module will get its own sub - vi.

  I'm not doing correctly?

  
  

• Direct local variable data VS

  Hey!

  I do LV Core 3 and hope someone enlighten me more... (Excersie 7-2 Solution more about 01:50 in the video to be more precise)

  According to this module, an indicator that is updated very frequently must be connected with direct data and not a local variable. Research assistance he said local variables to make copies of the data.

  It's a bit like this:

  1. I have an indicator that is 'coupled' to the X position of the memory.

  2. If I write a light directly he wrote directly to the X position of the memory.

  3. If I could write instead through a local variable... It would first create a copy of the data to write to the position indicator Y memory and then copy it to the X position of the memory?

  Thank you

  Peter

  Yes it's true.

  Now, imagine if you have a very large painting (and the elements of array must be States.map in memory).

  the first memory manager must find a place in memory where it can hold the table and you now have a memory more occupied by the local variable location.

• LabVIEW: Concerns with local Variables and the readability of the program

  Hello everyone. I was hired for the summer to work at my University to a new laboratory. All right, but I have some problems with my main VI. I am a new user of labview coming from a C++ background. I went through several iterations of adding features, fixing bugs and doing my readable program. Before the last "cleaning" my program was so big that I couldn't see it all at once on my screen. My goal was to solve this problem. My solution contained three parts: use a state machine show parts of my code at the same time, to remove the son as much as possible, and use structures element to position my code manually.

  I met since problems write other programs that brought me here, and I saw a series of messages condemning the new programmers for their use of local variables instead of cables. I do not know my use of structures element as fancy boxes I can exclude the automatic cleaning is also a terrible practice.

  After doing some more reasearch on the subject I see local variables to add the duplicate in memory entries and their suppression can significantly speed up execution time. I have a delay programmed in a part of my code, but the rest can run as fast as he can as far as I'm concerned.

  I have attached my main program. Looking at it I think I did a good job to make it readable. But I'm not a user expert labVIEW.

  How to balance (do not use local variables, these structures element, etc.) efficiency and readability. Before you make these changes, there was so many things and so many threads all over the place that I couldn't even tell what was going on, and even less my teacher. I really wish I could see my entire program without scrolling on this computer of the laboratory (resolution 1280 x 1024).

  Advice on how I can achieve the efficiency, simplicity and common readability would be greatly appreciated. I feel I've done the latter while sacrificing the first two. Ultimately the three should probably be equally important.

  Thank you.

  Nukem

  LabVIEW 2010

  

  As said altenbach, attach your event structures.  It should really be only need structure of an event, especially for a simple VI like that (I counted 3).  This is the second time I have recommended this today, but fetch JKI State Machine.  I use as the basis for most of my interfaces.

  Here's a way to manage the break with JKI.