network variables

Similar Questions

• How to use network variables to transfer data structure C?

  I found a CNVStruct in CNVDataType.

  When calling "CNVCreateScalarDataValue" I always get a message error "the data type is incorrect.

  typedef struct TestType_t {}
  float2 int [2];
  unsigned char Data [16];
  } TestType.

  TestType TestData = {{1,2}, "23456"};

  CNVCreateScalarDataValue (data, CNVStruct, & TestData);

  Network Variable only does support the primitive data types?

  Can I transfer data on the C structure?

  Hey Vincent.

  You can send some types of structure, but must be in place.  Because your structure contains arrays, you have a building yet more to do.  It should look like this:

• Network Variables custom control Option Disabled

  Hi all

  I am creating a network variable in a cRIO project using a predefined custom control... I've done this hundreds of times before in other projects... For some reason any "custom control" option at the bottom of the drop-down list data type is disabled...!

  I'm sure it's something very simple, but I'm well and truly stuck now... I'm not still connected to my RIO? I have not activated the network connection again...

  See you soon

  Harry

  Well,.

  I have now found the solution... This is a bug... Just stop LabVIEW (completely, not only the project) and restart and voila... the option to wake up...

  See you soon,.

  Harry

• Published the network Variables not accessible by other computers on the network

  I am trying to create a system where a computer will display network variables that can see any computer on the network, this includes a person bringing in a laptop computer and the connection for a short period.  So I was looking through a large number of forums to find an answer and tried many solutions and nothing has worked.

  This is where I am.  On a single computer if I update a variable network it appears on the DSM NOR (Distributed System Manager) under which the name of the computer and I use this variable and it is updated.  Any other computer connected to the network also appears on the DSM.  On the other computer, he sees the first computer in the DSM, but cannot see any one of the variables.  I also register the IP address of the computer, but it does not help.  If anyone has had this problem and know how to fix?  I had the same problem using my code for the project and the example code in the shared Variable Comms between Executables.Ivproj.

  Thank you for your time

  Mitchell

  I had some problems lately with the network stream. I know that this isn't nearly the same as shared variables, but it uses the same underlying process in windows. In my case, it's the windows firewall in Windows 7 that has the problem.

  This link help me configure my firewall correctly:

  http://digital.NI.com/public.nsf/allkb/0D7B86F4B4D19A5E86256F9A006EECB1

• At wich moment a RT controller deploys network Variables?

  Hi all

  I want to know when the shared variables are accessible on a RT PXI controller?

  During the system startup PXI to my request for RT (defined as auto-start) first wants to write the default values for variables.

  Here, I get the error:-1950679035

  This means that the variable is not deployed jet.

  I understand that it takes more of 5 seconds until the variables are really ready to read or write.

  For the moment, I use a work around:

  A network variable 'RT_System_Ready' is played repeatedly until the error has disappeared. This loop takes more than 5seconds.

  After the loop starts the main application and I no longer get the error...

  I think the boot sequence for the RT controller should only start the user application when all libraries are deployed and variables are accessible.

  Greetings,

  Henning

  Hey, Henning.

  No, the bootsequence cares variables, drivers or anything else to be ready, that is used in the application.

  Interrogation of a flag or until the error is gone or waiting for a - and - time is the only way to get that everythings ready!

  Christian

• Network Variable string array

  Hi all

  I'm working on a project that would require one program to talk to another (same computer) program, where the use of the network variable.

  Now say that I have a list or a table of names that the changes in a single program, what I would do is to take parts of the list that is in a single program and transfer parts of the list to another program.

  The list must be transferred at least 40 unique names of different sizes with letters.

  I have data tables ready I just need to understand the part of the transfer.

  I tried the 3D.sim, but it seems to be a problem when I'm with strings, especially when the strings are of different lengths.

  Also when using the CNVCreateArrarDataValue errors on table place being small on the size of the array?

  String array lists are usually 2D (line and size) does that factor in?

  Assume the network variable is declared

  code exp just to get the idea...

  int i = 0, numItems = 10;

  Data CNVData = 0, NVlist [120]= {0};

  size_t dim= {0};

  size_t dim2 = {0};

  for (i = 0; i<>

  {

  char name [20] list = "0" / "."

  GetTabelCellValue (Panel, PANEL_LIST, MakePoint(2,i), name of the list);

  Dim [0] = strlen (listName);       I tried size_of but definalty did the Sun big

  CNVCreateArrayDataValue (& NVList [i], CNVString, name of the list, 1, Sun) ///i get questions of size table here

  dim2 ++;

  }

  CNVCreateStructDataValue (& data, NVList, dim2) ///here is another problem with dimensions

  CNVPutDataInBuffer (handle, data, 2000);

  I also tried

  for (i = 0; i<>

  {

  char name [20] list = "0" / "."

  GetTabelCellValue (table, list, MakePoint(2,i), name of the list);

  Dim [0] = strlen (listName);

  CNVCreateDataValue (& NVList [i], CNVString, name of the list)

  dim2 ++;

  }

  CNVCreateStructDataValue (& data, NVList, dim2) transfers of value of string ///one

  CNVPutDataInBuffer (handle, data, 2000);

  I think I'm close, but just can't get the right sequence

  Thanks

  lriddick,

  You can write an array of strings easily, but it must be an array of strings. It cannot be a two-dimensional character array, which is not the same thing. For example, the following code should work (I replaced your table with a table called "table", but the rest should be the same). Note that I have create only a single CVNData, not a picture of CNVData:

  char * array [] = {'one', 'two', ' three', 'four', 'five', "six", "seven", "eight", "nine", "ten"};
  char * name [10] list;
  CNVData = 0, NVList data;
  size_t dim [] = {10};
  for (i = 0; i<>
  {
  name of list [i] = malloc (strlen (table [i]) + 1);
  strcpy (name of list [i] table [i]);
  }
  CNVCreateArrayDataValue (& NVList, CNVString, listName, 1, Sun);
  for (i = 0; i<>
  free (listName [i]);

  CNVPutDataInBuffer (handle, NVList, CNVWaitForever);

• network variable will not work with VBAI 2010 and windows 7

  Hello

  In fact, I have a problem with 2 EVS-1464 (windows 7) and VBAI 2010.

  I have to use network variables to allow the communication between two electric vehicles, but I can't use it. My network is ok (I can ping between the two facilities) but I can't (t access the network variable.

  I did a test with VBAI2011 EVS / VBAI2010 PC windows XP--> it works. (but I don't want to use VBAI 2011).

  You have solutions to solve my problem?

  Thank you

  Ulysses

  Hello

  Here are several documents that might be useful for you:

  Using the LabVIEW shared Variable

  Troubleshooting network-published static Variables

  How can I use shared Variables to transfer data from Vision Builder for Automated Inspection (VBAI)...

  You can also try something. To do this, you must go to the EXE VBAI here:

  For 32-bit machines:
  C:\Program NIUninstaller Instruments\Vision 20XX\ VBAI

  For 64-bit machines:
  C:\Program Files (x 86) \National Instruments\Vision VBAI 20XX\

  Right-click on "Vision Builder.exe", and then select Properties.  Make sure "run this program as an administrator" is checked.

  Click OK, and then try to rerun VBAI. You may need to redeploy the variables in the variable Manager until they work properly.

  Kind regards

• reconnect the stall network of shared network variables

  I have a cRIO unit communicates with a laptop using shared network Variables, one of them being a table of 21 index which is buffered.

  The system connects and communicates very well, but sometimes the wireless laptop card is to lose the signal from the WAP, attached to the cRIO.

  In this case the network never shared Variables "reconnect" and start to receive values still once the wireless link is restored.  Is this expected behavior?

  When I tried to use other WAP industry instead of the card laptop wireless, I get no abandonment.

  Hello Ryan,

  Please contact National Instruments!  I looked into the problem you are having and I wanted to ask you a few questions more.  First of all, you have a period of time which allows the reconnection?  I believe that the Shared Variables should find the connection after a short period, but it may not be a very quick process.  It may take a few minutes to the Variables shared to reconnect.

  The other thing that could happen is if you have error son being passed by shared Variables, it is possible that the error is not be deleted, and so he will always see the error and not a so never reconnect.  In this case, you will need to filter this error and then clear the error in order to use again shared variables.

  If you have more specific information about your program that can help us to determine the reason for this behavior.  As a screenshot of your code would be useful.  Please let me know if you have any other questions and I'll be happy to help you.  I hope this helps!

• Errors in library with network variables

  I'm trying to use variables shared for my real time program CVI, but whenever I try to make a call to a function CNVwhatever, it-error saying that it was unable to open the library. I'm under CVI 8.5 with all drivers up to date. I uninstalled an reinstalled all the software on my module PXI-8106 twice now. The Variables shared more up-to-date software is also installed on the machine of RT. What I am doing wrong? Thank you.

  Hello Mark,

  I found documentation that describes this error and he gave a possible solution, I want you to try:

  The error-6398 is thrown because LabWindows/CVI is looking for the 8.5.1 version of the DLL on the RT system and it can find version 8.5.0. To work around this problem, follow these steps:

  1. Open the Directory to \RT Images\CVI\8.5.
  2. The ninetvR.dll file and rename it ninetvR.dll.old.
  3. Download the attached file ninetvR.dll to the \RT Images\CVI\8.5 directory.
  4. Open the Measurement & Automation Explorer
  5. Expand the category of remote systems .
  6. Expand the target of RT.
  7. Right-click on the software element and select Add/Remove Programs.
  8. Select the Network of LabWindows/CVI Variable for RT element in the tree view of the setup of the wizard of the LabVIEW Real-time software,
  9. Click on the icon next to this entry and select reinstall this feature. Click Next.
  10. In the review selections dialog box, ensure that the entries are correct, and then click Next.
  11. Restart the system.
  12. After reboot, the system variable RT functions network should work.

  I had to post the file as a .zip file, even if it is a dll.  Please download the file and change the extension back to .dll
  Please let me know if you have any other questions implementation of this solution.  I hope this helps!

• Reading and analysis of a network variable

  I am in need for ideas on how to read binary data written to a text file outside of the network in a windows program, LabVIEW.

  I need to read that data with a LV Vi say every 5 seconds and based on the result of pass/fail value analysis and recording of data.

  I also need to erase these binary data read once, for new data must be written by the windows program and so that LV 'read' vi can get new data.

  Any help really appreciated.

  I think that you can do while loop with the update for timing control, reading that in all the 5 sec is not a problem, but I guess that you need better synchronisation with the two watchdog execution so the follow-up program for network connection network too. You can try to publish or share Boolean variable controls with correct extension that your platform windows and labview can understand, for the control of loan and wait conditions more to indicate the connection to the network, so that your program running smoothly without having hung.

• Sharing network Variable not in Distributed System Manager

  I have experience with LocalHost.   I have 2 computers A, B.  A, I can read a created/static SNV of B.  However, I need to use a SNV on A to A (I don't know why, I inherited this project and it is not at all commented).  So I create and I see it on my drive D:\\.  However, when I go to NI DIstributed System Manager, there are no library under localhost.  So I write in a VI and call it in another, and I get "DataSocketRead in VI" with the code 56.  Don't know why I can't have it is the Manager.

  I have attached ahev the library in case something wrong here.

  Have you deployed and right click the shared variable library?

  If it's an executable in the bulder properties you should check to deploy shared variables.

• Network variables shared to the host PC

  Hello world

  I need to send the results of a time operation real PC to PC host without affecting the determinism on the PC in real time.

  To do this, I have two periods loops, the two race 417 microseconds, but at different levels of priority. Who runs the algorithm on the PC in real-time is a priority of 1000 and the other loop that transfers just results from the PC to the host PC in real time is a priority of 100.

  I measured the worst time taken to perform my loop of high priority to be 150 microseconds. I have so much time to send the results to the host PC. (I want to results updated all 417 microseconds).

  I run the algorithm for 40 seconds on the PC in real time. But the values are updated on the host at the end of 40 seconds PC and not at each iteration of the loop I want.

  What was my mistake?

  Kind regards

  Prashant

  Thank you all for the responses.

  I found my mistake. I had wired a variable directly from the first loop timed for the second timed loop. This is the reason why the second loop was still waiting and never run. I used dummy shared variables to transfer data between the loops. Now, the loop works very well.

  Thanks again

  Prashant

• Shared data varying variable published network write error

  In my project in real time, on the VI host running on my Windows PC, I try to write in a number of published network shared variables.  All these write operations are successful (which means that I can read them on the RT target, then a cRIO-9012), except for these shared variables network-published with data type defined as Variant.  I'm not sure what is causing the problem.

  I take the table of clusters shown here...

  

  .. .and going through one "in Variant' VI and then subsequently in writing to the shared variable (data type: Variant).  Diagnosis of the failure of the VI in real-time to read the data, I found that variable writing shared on the host VI produced the following error:

  Error - 2147467259 appeared to Variable shared in the PC host TTS CTRL.vi

  Possible reasons:

  LabVIEW: Unspecified error (Hex 0x80004005).
  =========================
  System OR Configuration: Various operating default (Hex 0x80004005).

  This error or warning occurred when writing the following shared Variable:
  Shared \\My Computer\Network Variables\TC trust Array Group - network
  Shared \\128.144.90.143\Network Variables\TC trust Array Group - network

  .. where 128.144.90.143 is the IP address of the PC.

  Any thoughts?

  Sean

  I saw this post, and when I found myself with no other option, I have redefined the variables in question to the string data type and replaced all the "to variant" and "given Variant of ' functions with functions 'Flatten channel' and"The string Unflatten"respectively.  Initially, it did not work - functions "Chain Unflatten" would produce error 74, until I realized that the "data includes array or string of size? (T)"input on each 'string Unflatten" function must be set to FALSE. Wiring a constant false for each instance of "Unflatten to the string" seems to have corrected the problem.

  I have still no idea why wouldn t Variant.  Shared variables Editor allows to define a variant data type, so I guess it's supposed to?

  Sean

• 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.

• 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.