Passing an array via one RT FIFO network shared Variable, Code error-1950679034

Similar Questions

• Are published network shared variable write & read Atomic actions

  Hello

  I have a very basic question about shered (published network) variable.

  I think I know the answer already, but since I couldn't find in my documentation, I thought that it is more prudent to request...

  Are reading and writing on a shared variable of stocks Atomic?

  To be more precise: on my target real time I create an array with data (each element being the configuration item or a cluster containing name, value, and type) and when the table is finished I am this store in a published network shared variable.

  On my host (Windows), I'm voting (in a loop) until the table contains at least 1 item, when this is true I'm parsing all the elements in the table.

  Is there a chance that, reading of the shared variable, the table contains a subset of the original painting on RT target (i.e. the action of reading takes place while writing is still ongoing).

  Or is the action of reading delayed until the write is completed? (i.e. both write and read actions are atomic even over the network)

  I think the latter is true but not could find no evidence in the documentation.

  Kind regards

  SoC

  Hello Rob,

  Yes, you can access the entire value, data type - you use both. For the table data type, the integer value is actually the full picture. So, Yes, you can see reading and writing as Atomic actions.

  But, on the other hand, you can lose data if the RT system rewrites the variable before the host had the time to read. To avoid this, you can enable buffering for the variable. See the following links for more information:

  http://www.NI.com/white-paper/4679/en

  http://zone.NI.com/reference/en-XX/help/371361H-01/lvconcepts/buffering_data/

  Finally, you can also activate a FIFO RT on your target RT if you need to send data through the variable in a deterministic section of the RT. See also, more information:

  http://zone.NI.com/reference/en-XX/help/370622H-01/lvrtconcepts/rt_projectvariable/

• network shared variable treatment

  Hello everyone,

  Someone tried to link data from a network shared Variable to the query (running in a smartphone or Tablet) made with "treatment"? I know on the dashboard of data but I would like to know if West someone working with these two technologies. Thanks in advance for your answers, comments, suggestions, etc.

  Hello Bene

  Apart from the dashboard of data there are other technologies that you can use for mobiel applications in LabVIEW

  If you already use a shared Variable, then the easier and faster way to connect your mobile device and the PC on the same network and then simply use DataDashboard to read from your published variable.

  You can also create your own thin clients or http Web pages and link to labview, send sms, share a front panel to distance between computers

  Here is a link where you can read all about it

  Cheers and good luck

• Network shared Variable breaks rtexe

  I have a cRIO-9063 which I want to use for the control (PWM digital output for pumps signals) and measurement (temperature and voltage) of a system. In the ideal configuration the cRIO would be able to take measures and rebroadcast to a PC for monitoring and logging. The PC must be also able to change the digital output PWM on the cRIO lines. The cRIO should be able to continue to operate when the PC is not available. To do this, I use Scan interface for data acquisition and shared variables (single editor, no RT FIFO) hosted on the cRIO for network communication.

  I have developed the code for the target cRIO as well as my host PC meets my criteria. However, this code only works in development mode. When I try to build and deploy a rtexe on the cRIO, it does not work. I reinforced to the back and made a simple LED flashing user vi, ensure what I create and deploy properly. Slowly adding things to this flashing vi, I discovered it's shared network variables that break the vi once it is integrated into a rtexe.

  After flipping through other-related posts, I'll include the following:

  -There is no object on the remote VI front panel. Simply add a variable node shared is enough to break the vi (when it is deployed).

  -J' tried including my shared variable library in support of the construction directory, but what I saw there is not copied during construction or deployment. I manually copied the library to the /home/lvuser/natinst/bin/data / directory on the cRIO, then used an invoke node to deploy the cRIO variables when the software starts first. Even when you include a delay of 10 seconds after the invoke node, it did not work, just a mistake of 1043 at "the method or property is not supported in this version of LabVIEW."

  -NSV is referenced as absolute

  Some details of my configuration:

  LabVIEW 2015

  cRIO 15.0

  NOR-RIO 15.0

  Communication via ethernet, static IP

  Any help would be GREATLY appreciated. I suspect that I forget a few minor step or detail, otherwise am poorly understand exactly how and when shared network variables are deployed.

  I found shared to not be worthwhile over the years network variables.

  The RT EXE is not able to use the library to deploy to deploy the shared Variables.  See Help topic: http://zone.ni.com/reference/en-XX/help/371361M-01/lvprop/app_libdeploy_library/

  In general, SV are deployed once the project and they persist through reboots of the RT system.  In general, you should have a startup routine that checks the shared variables and expected for there to be without error on a node of the OAS and then move on to the rest of the program, defining the commissioning of values and check that they spread in the engine of the Variable is a typical method.

  See here for more information on the deployment of a variable in an application of the RT.  http://digital.NI.com/public.nsf/allkb/990508969805A7C086257619007189E7

  The section deployment of Variables shared in a real-time (RT) target running Headlessly is downstairs.  Because you are connected to an HMI PC, you should be able to use the library to deploy feature of the PC code targeting the cRIO.

  Usually, it's a faster, more scalable solution to replace your shared network Variables with a stream of network dedicated to the HMI and another for HMI - RT EXE commands.  You can send complex structures such as a cluster or even define the message as a cluster of enum and variant type to be able to use the Enum to convert the variant correctly according to the Enum value.

• Why network shared variables is wrong values at startup?

  I run the example of the "RT FIFO Variables - Networked.lvproj" expedition. Once I have deploy shared variables that I can run successfully the host and the target live. Data is exchanged as expected. However, once I press the STOP button on the host VI VI target cannot be restarted independently of the execution state of the host VI. The only way I can get the target VI to start running again is to change (for example to add a text box or somekind of NOP) and then redeployed.

  It seems that some incorrect value gets stuck in the target variable stop FIFO and so cannot run the target. I tried to add a variable entry to the variable STOP before the loop in the example, but this is not enough.

  Can someone explain to me why this example of shipping can be run twice consecutively without a necessary redeployment?

  I vaguely remember something on the initialization of the shared Variables (I can't find the reference right now).  But I tried the demo code (finally) on and (as it turns out that) I had reason - is an example of poorly written, precisely because it is 'designed by omission"to work exactly once!

  Remember that instructions must start the host, and then start the target.  The first time, at the start of the target, you get a sinusoid.  But once you stop the host (which also stops the target), if you start again host, then the target, the target will stop immediately.  This is because the target (but not host) the shared Variable stop (when the target starts to run) as True (what it was the previous time the target ran) and stops see.  What you need to do is to provide sufficient time for the Variable (reset) shared between the host and spread throughout the network and gain access to the target.  I tried to put a 50 ms delay before entering the loop of the target - not long enough.  But 500 ms was fine - the example ran fine the second, third and a fourth time.

  I'll bring this to the attention of OR.

  Bob Schor

• Embedded FPGA vi - network shared variable not updated

  Hello

  I work with an ethernet RIO 9149 of data acquisition. I use a hybrid programming mode.

  I have a very simple FPGA VI that I downloaded on the flash memory. I used the indicator led to show my VI runs once the power of the RIO. Everything is fine, except that my shared network variables are not updated in the DSM ("no known values" displayed). However when I run the FPGA VI of my laptop, only once then stop and close (with 'interactive execution'), then my shared variables are updated in the DSM.

  Any ideas why is this and how do I get the RIO update automatically shared variables without having to run the VI once?

  Thank you very much.

  Hello

  I did a few tests and research and discovered that it doesn't seem to be possible. It is important to note the difference between Network-Published static (NSPV) and Variables of e/s of Network-Published.

  The other are "user defined variable I/O" to communicate between FPGA and RT (RT absent on chassis Ethernet as the NI 9149) host. If these variables are checked to be published-network (in properties). They are accessible by VI running on the hosts of the same LabVIEW project, so you need to run a VI to access, as you mention. This is explained on the next page, Variable IO data custom FPGA of e/s (real-time Module or Module FPGA):

  https://zone.NI.com/reference/en-XX/help/371361H-01/lvioscanhelp/io_vars/#user_IOV

  I did find a way without a host (host RT or Windows PC) running a VI. If you have a cRIO with RT and NPSV host in the RT VI it is possible.

• VI refuses to run when the published network shared variable is not available

  I have a VI of logging data on my PC that gathers data from several sources, including several shared variable published network hosted on an RT target.

  The problem I have is that the data logger VI refuses to start if the target RT is disabled and the VI is abandoned if the network connection is interrupted.

  Is there an easy way to detect when running, be published these variable network are available and use a placeholder value, if they are not rather than the current behavior of refusing to work?

  I saw many people using data sockets, but I try to avoid the overhead of setting up and testing a loop of treatment relatively complex network on both ends when the network has published shared variables are so simple to use and works perfectly as this abnormal behavior.

  You can replace them with programmatic access (shared variable aperture and friends) and the dummy data placeholders if the variable is not accessible.

• Shared variable between 2 LabVIEW executables via the network

  Hello, I need to create a number of network shared variables by two (built with LabVIEW 8.6) executables running on two different computers on a local network. The library to invoke node returns an error when you use a different IP than localhost. even more, it is not clear to me what exactly I have to do (what executable deploys the library, on which targets, activate the link or not, so on...). Thanks for any help, if you have already managed to make this communication works properly...

  Thanks for the replies. I've found the last two documents, but the first one is the most interesting: if I can't put the sources of two applications in a single project, I will move to another solution (data as suggested by Mike sockets or TCP). The two original projects are larger, and their merger would lead to such a huge thing!

• Shared Variable (published network) communication

  Hi all

  All day I was hitting my head with variable communication shared between RT host and the host computer:

  I basically tried to pass an array of the host of the CR to the host computer. For this I used a published shared variable of network type Array U64. I used this link to help me understand usign shared variable communication

  http://www.ni.com/white-paper/4679/en ...

  I also activated RT FIFO. Now in the city that link the information given on the use of FIFO of the single element or Multi element FIFO

  "By enabling real-time FIFO, you can choose between two types of compatible FIFO slightly different variables: the only element and the buffer insurance program. A distinction between these two types of buffers, it's that the only element FIFO reports no warnings on positive or negative overflow conditions. A second distinction is the value returned by LabVIEW when several readers read an empty buffer. Several readers the only element FIFO receive the same value, and the only element FIFO returns the same value until a writer writes back to this variable. Several readers of a FIFO empty array each get the last value that they read from the buffer or the default value for the data type of the variable, if they have not read before variable. "

  I had read the content above a 100 times, but still I'm not able to get a clear picture of the difference and when to use which option. So I decided to take the text and tried to try something for me.

  I had a loop in the reception of RT who writes arrays of 3 different elements in the 'network published variable shared'. Now when I use the option of multi element with "number of berries as - 2" I am able to read tables separates one by one in the host computer (as you can read a queue in general).

  Now when I used the option of single element for the RT FIFO with 1 UN editable table option, only the last table written in the 'shared variable published network' is read in the host computer.

  This seems absolutely ridiculous as if this is the case, then what is the purpose of creating the "buffer". For testing purposes, I had put the buffer in 5 tables.

  In fact, I have only a single author (written in loop in the reception of RT) and a reader (new looping in the host computer). So I don't know even if I need option of the RT FIFO for the published network shared variable.

  I'm sorry for the long message but I've reached the limits of going around in circles waiting to type somewhere

  I know I made a mistake stupid somewher or it miss me probably a clear simple trick but don't know what it is...

  I request some clarification... In fact I posted a little while earlier today so ... bind - http://forums.ni.com/t5/LabVIEW/RT-Host-to-Host-computer-communication/td-p/2348130 )

  any help would be appreciated

  See you soon

  me

  Hello

  I think that the difference between these two types is clearer by using LabVIEW:

  "

  Activation of the FIFO in real-time

  You can activate the FIFO in real-time to a shared variable since the page FIFO in real-time of the properties of the shared Variable dialog box. Check the box Enable the FIFO in real-time in a deterministic way share data using the one element or several elements FIFO.

  Single element FIFO

  One FIFO shares the most recent value of the data. The shared variable overrides the value of data when it receives a new data value. Use this option when you need only the most recent value. Configure the size of the elements of the array or the size of the waveform for the FIFO buffer, if you select a table or a waveform data type.

  Several elements FIFO

  A FIFO multi-elements implements buffer the values shared by the shared variable. You can configure the size and elements of the buffer FIFO to match the parameters of buffering to use of the Variable page, or you can configure a custom size for the FIFO and FIFO elements.

  Note  For single item both multi-elements FIFOs, if the variable contains data table or a waveform, you must configure the size of the elements FIFO equals the size of the data to share. If the network buffer both the RT FIFO are enabled, the network buffer should be at least as big as one of the elements of FIFO. Sharing data smaller or larger that the specified length results in a memory allocation which affects determinism.

  Note  Waveforms contain variant of varying size that are not compatible with real-time FIFO. Therefore, if you enable the FIFO in real-time on a shared variable that contains the waveform data, the item variant waveform data does not transfer.

  "

  http://zone.NI.com/reference/en-XX/help/370622K-01/lvrtconcepts/rt_projectvariable/#Single_Element_F...

  ' Hope this helps

  Aurélie

• to access the network of vision builder error

  to access the network error VBAI

  It used to work yesterday but idon't know why not today

  So, you have problems writing to a published network shared Variable? You might be able to solve this by using the software manager system OR distributed. By using this software, you should be able to see all the network published static Variables that are hosted on this computer and all other computers on the network. You can try to modify these variables using this software. If you have the same problems with the variables shared by using this software, then this probably means that there are problems with the network in general as a firewall blocking the communication.

  You can check if you have this by navigating to start > all programs > National Instruments > Distributed System Manager. If you do not already have it, you can download it here: http://www.ni.com/download/ni-distributed-system-manager-2013/4216/en/.

  This knowledge base article may contain useful advice on how you might approach this problem: http://digital.ni.com/public.nsf/allkb/6E37AC5435E44F9F862570D2005FEF25?OpenDocument

  Good luck

  Jeremy P.

• Pass an array of real-time desktop PC

  Hello

  I recently started using LabVIEW Real time. I want to transfer an array of data from a PC to office to a PC in real time. The data transfer is time and once real PC will make further processing of the data. I'm using LabVIEW 8.2 and the corresponding version of the time real LabVIEW. I do not understand how to program the time real PC to receive all the elements of the array in the order. Below is a brief description of what I've tried so far.

  At the beginning, I created a shared variable on the computer which was the data type double target. I activated "Buffering" and set the size as 10 double rooms. Enable FIFO tab real-time time real FIFO, selected several items and set the size as 10 double rooms. On the desktop, I used a loop for to transfer all the elements of the array in the shared variable. I used a 500 ms delay in the loop for debugging purposes. On the target side PC, I used a while loop, the same delay of 500ms and built a table reading the shared variable. To run the program, I ran the VI on the target PC and then the VI on the host. I could see that the painting was being filled with data from the host computer, but the first element of the array of host PC has been filled in the second element of the array on the computer target. Another problem, is that there is no way to prevent the target computer that the host PC had sent all the data and he had to stop the filling of the table. The first problem with lag of data can be attributed to the timing. But I don't know how to solve problems.

  I also tried declaring the variable shared on the computer target with the double data type 'Array of '. But when the data is passed from the host PC for the target computer, I don't see the variables reflected on the target computer.

  Is could someone please tell me what error I do here?

  Hello

  The problem has been resolved. It is LabVIEW time real 8.20 which has been altered. Therefore, did a re-installation of LabVIEW. Now I have the sample project attached (ex2.zip) in the previous post works perfectly. Thank you for your help.

  Kind regards

  Prashant

• 2: Sequentially all an elements of array, display one after the other

  Hello!

  This is a new start for another thread (http://forums.adobe.com/message/4897959#4897959).

  (ActionScript 2 ONLY)

  My site is a SWF that loads on the user requests data from a database of MySQL via PHP.

  I have no problem to control the whole communication process.

  On the homepage, as well as new which are already presented in the main part of the right side of the page, I want to display on the left side a few reminders of the essential services and also registered users of mandatory measures must do when visiting the site.

  DB returns: an array with one. separator and the total of the items in the array.

  In Flash, I use the following function to get the picture:

  remindersFct = function () {}

  var myReminders = new LoadVars();

  myReminders.identity = "reminders";

  myReminders.onLoad = {function (ok)}

  If {(ok)

  _root.reminderFld.html = true;

  var myArray:Array = new Array (myReminders.mydata.split("|"));

  myArray.length = myReminders.totalItems;

  }

  else {}

  Stop();
  

  }

  };

  myReminders.sendAndLoad ("misc.php", myReminders, 'POST');

  };

  remindersFct (); start the process

  I want to know different things...:

  1 - How can I 'explode' this table in its different elements (all are text strings)

  2. so, how can I know the SWF to view them, one after the other, in the field appropriate htmlText

  3. How can I adjust the length of each of these items, based on the length of the text they contain

  Thank you very much in advance for your help!

  Just another thing.  Given that you call the setTimeout for both halves of the conditional, it means that you don't need in the conditional and can move around outside, and you don't need in the first half of the conditional either...

  counter ++;

  Sto var = setTimeout (displaytext, delay);

  If (counter == theText.length) {}

  counter = 0;

  }

• by passing the array of strings of Teststand to LV dll

  Hello

  I wonder, why is it not possible to pass an array of strings 1 d of TestStand to a dll, which is compiled with LabView. By the way the PropertyObject works very well, but as parameter category "Array of Strings" exist in the call dll TestStand pane, it should be possible to pass an array directly. I get an empty dialog box, where I try to view the contents of the array passed directly.

  Why it does not work?

  

  
  

• Pass an array to a node form

  I have an example of table [0, 2, 4, 6, 8]. I want to pass this array to a knot of formula that calculate the square of each element of the input array and show the resulting table.

  For example, the formula is 'square '. Output array should be [0, 4, 16, 36, 64]

  I did not like it, but there was an error...

  Can someone please?

  Here's how you do it with a knot of formula.

  Can you tell me which seems easier to code?

  It took me 2 seconds using the square function.  And 10 minutes to get the syntax for the node of the formula.

  

• Problem "there could be a problem with one or more network adapter on the computer?

  Hi, I just changed my modem, I can't connect to the internet. I can connect to wireless network but not to the internet. When I diagnose, he said, "there could be a problem with one or more network adapter on the computer. I searched the internet but I can't find anything. When I diagnose, I have also seen something on the 'hot spots', but I can't remember it clearly? Any help please?

  Also, when I go to Device Manager network adapters, each of them has WARNING signs except two of them.

  Hello:

  If your laptop is an Atheros AR5007 wireless card, see if installing this driver solves the problem, you have to be able to connect to wireless but no internet network.

  http://h10025.www1.HP.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-108905-1&cc=us&DLC=en&LC=en&JumpID=reg_r1002_usen_c-001_title_r0004