How the shared variable affects determinism RT?

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• How can I dynamically select the shared Variable API programming data type?

  I am trying to create a configuration of open connections of variable shared using the programming API. It seems to me that the cleanest way to do would be to put one "open and check" routine in a loop, then call it for each variable in the library.

  The question that I am running is that I have different types of data in my library (to help a server Modbus i/o and data types 'boolean' and 'single' in my library.) How can I dynamically select the data type of the shared variable API?

  See the attached snipit.

  Thank you

  What I ended up doing was doing a Subvi to open, read, write, and close each data type, I use the packaged in 4 polymorphic SubVIs (polymorphic Open, read, etc...)

  Now all I have to do I drop in the polymorphic Subvi and it switches automatically to the appropriate data type

• Can I send value cluster through the shared variable?

  Hi every1,

  I want to send a cluster through the shared variable. While creating a shared variable, there are options to choose the type of data, but there is no option to Cluster.

  But there is an option of "custom control". How to use it?

  Hi, Germain,.

  Create your control and save it as a file on your disk *.ctl. If you use the "custom control" option, and then select your control. If this does not work for your control, you can use the function 'flatten in string' to send a string.

  Mike

• new variable networked shared in my computer, but not in the shared variable engine list

  I have a Variables.lvlib shared on a cRIO target and test algorithms when I don't have access to material cRIO. Thought I could do a new project, add the library to the windows target (workstation). I need to add a few additional variables, I did in the original (i.e., while the library was the target in real time). Then create a new project and added the lvlib to the project (under my computer), and then wrote a VI to write in these SVs. When I let fall a constant Variable Refnum shared on the block diagram and browse for objects variables under 'Variable' Motors > ni.var.psp > localhost > shared Variables, list of variables shows everything except the 6 new variables. When I switch the view 'Current project', I get the same variables for new list WITH THE 6. However if I select the variables in the list and run the VI I get an error-1950679035 impossible to locate the variable in the shared Variable engine. Of course, I forgot something, anyone out there set me straight?

  Thanks for your time - lmd2

  Hello Lawrence,.

  Looks like you'll have to maybe just to deploy the new variables - refer to this document:

  LabVIEW Help: Making static Variables available on a network

  http://zone.NI.com/reference/en-XX/help/371361K-01/lvconcepts/sv_deploying/

  Hope that helps!

• Support of the shared Variables in the third part XP embedded based of PTC?

  I sent a request in an embedded XP touch function (third party). The application works very well, but hosted on a RT (sbRIO Board) shared variables are not getting updated in the app on PTC

  1. the PTC is part of the project as a Windows XP Embedded Touch Panel

  2 NI TPC Service has been installed on the PTC and the application can be deployed remotely from the PC development via ethernet. (Where network connections and communications are OK)

  3. using distributed in the development computer systems manager, I can see that the shared variables are getting updates on the network

  I think that the problem can be solved if the following programs are installed on the TPC

  A. Support for variables that are shared for XPembedded

  B. shared Variable engine

  I tried to install the support of variables shared Program Files > National Instruments > Labview 8.6 > PDA > utilities > Variables > x 86 - but I get an installation error "cannot find the application for the Pocket PC applications Manager.

  Shared variable engine was installed from the ve220 folder. The program is installing. But the engine Variable is not start Control Panel > administrative tools > Services, Xpe, the service is stopped and cannot be started. When I try to start the service, I get the following error on PTC

  "Cannot start Service engine of National Instruments Variable on the local computer."

  Error 1053. Service has failed to demand launch or timely control.

  Please suggest solutions to the addresses above or another of the following:

  1. support of variables shared for XP built-in PTC

  2 Installer engine Variable shared.

  Thank you

  Krish

  Problem solved!

  Update for interested people working on XP Embedded PTC

  Just to ensure that shared Variables were indeed accessible to the TPC, I wanted to install Distributed Systems Manager 8.6 on the TPC. However given that the TPC was only 1 GB of DOM (disk on memory) and with all the software that I had tried, there remained only a few megabytes on the system. I had to add an another DOM of 2 GB.

  All products in the Installation went well, with the exception of the Logos NOR (Version 5.0). Logos OR installation has failed repeatedly.  I tried to install NI Logos separately, with the same results. Then I had this intuition that NI Logos had anything to do with the question.

  Then, I downloaded the new version of NI DSM 2009 SP1. Even if it were to settle on any fresh system without Labview, the installation would not proceed beyond the stage of configuration. I tried to install NI Logos of the folder on the download of new products separately and it worked magically!

  Once the new Logos (Ver 5.5) installed, the Shared Variable engine starts automatically and the shared Variables are finally unleashed - free stand up and shine! I thank Almighty God!

  On the lighter side, come to think of it - to run an application about 400 KB, we need NEITHER of Run Time, XP embedded, DSM, Logos...  (around 900 MB). Can make us everything simpler?  Invite your comments...

  Thank you

  Krish

• What is the blue thing in the shared variable?

  I'm going thorough a code that has the huge set of shared variables and in some nodes, I find a blue color of brand/thing left bottom just worldwide as shown below.  What this indicates?

  

  Thank you

  Ajay

  I found the answers of my team member.  The blue mark indicates in fact a point and a slash ". ------"which means relative sharing Variable target."  If the shared Variable is absolute, this indication does not appear.  To learn more about the difference between shared variable absolute and Relative target, check it out here.  A Shared variable node can be established between absolute and relative assistance

  Menu popup (right click the node)-> reference mode.

  Thank you

  Ajay.

• Publish a queue using the shared variable

  I have a 2D table queue and I would like to publish (the reference) in a shared variable, so that I can pay the items in the queue in an another vi. I tried to create a queue control and used the custom of the shared variable control option, but it gives me an error "invalid data type.

  You try to read from the queue to another computer? Passing the reference to the queue on the network to a another computer will not allow the application to read data from the queue. The queue data is stored only locally.

  I honestly don't know why you get an error trying, however. Other options to access a queue in the world on the same machine are to use a Global Variable, rather than a shared Variable, or to get your reference queue by using a well-known name who know the other parties of the request.

• How to locate where the shared Variables are used in the project.

  I'm looking everywhere where a shared Variable is used in my project. Right-clicking does not provide a find. The display hierarchy does not help. In the Project Explorer, the appellants find displays only the names of the screw called, not the many places where the call is made.

  Does anyone know how to find the location where a shared Variable is used?

  Edit-> find and replace. For "Select object" click and access features-> Structures-> shared Variable.

• How to sort the shared Variable libraries

  I have large libraries SV in my project I want to sort by variable name.  I tried to export to Excel, sort and then import them into the library, but the type did not appear.  It looked like loading each variable then the multiple variables Editor opens with the original (unsorted) list I pressed the fact and then is back to were I started.  Any ideas?

  "In LabVIEW, you can sort variables shared libraries by right-clicking on the library" arrange by "name.

  

• TPC-2012 cannot read the shared variable

  Hello

  I have a TPC-2012 and can not read variables shared with him. I welcomed the shared on a cRio-controller Variable. On another PC, the variable is read correctly, but not on the tpc-2012. What can I do? No error message is displayed on the TPC-2012 (Windows CE 5). The PTC can not write values in a shared Variable.

  Thank you

  Christian

  What LabVEIW Touch Panel version do you use? I don't know why static variables do not work correctly on your device. TPC-2012 comes with support preinstalled for shared variables, and it would be possible that it has been deleted or corrupted. Here are some steps you can follow:

  Install the Support of shared Variables
  How do we install the Support of Variables shared on the TPC-2012?

• URGENT DSC: I can write to the shared variable but can NOT read?

  Hi all

  I use DSC to communicate with an automaton of DVP28SV DELTA. I managed to write to a coil to turn on a fan, and I have also written in a register.

  However, when I tried to read the spool (spool the same I just turned on) or when I tried to read a record that I'm very sure that has values registry where I configure the parameters of modbus, it would return to ZERO, even when I tried to read the registry I just write in the answer was zero (I do not know the entry in the registry was successful because I did the specific value that) I wrote to the registry a condition to turn on a light).

  So, anyone know why this might be happening? the registers are read/write. I thought it might be time to scanning in the controller is too short, so I added delays, but everything I read always gives zero return. ideas? can someone help me with this?

  Here's the manual for registration of corporations, in the case where it is important: http://www.delta.com.tw/product/em/control/plc/download/manual/DVP-PLC-Program_O_EN_20120416.pdf

  In fact I solved this in time ^^ in the case where someone faced the same question and get zeros in the response, which has worked for me exchange of programming (by clicking with the right button on the shared in my VI variable).  Why it works? no idea. but variables starting to give me the correct values.

• Pass a reference to the shared variable

  I use two shared variables in a loop where I write one and read each other.  I need to repeat this loop 5 times, but each loop uses a different pair of shared variables.  These variables are shared between a vi on the computer and a cRio.

  It would be ideal to incorporate this loop into a Subvi where I can pass a reference to the two shared variables in and then read and write in threw these references.  Then I could just call this Subvi 5 times, instead of copying and pasting the loop 5 times.

  Is it possible that I can accomplish this?  I can't find an example that would achieve this.

  Thank you

  If I understand correctly, you can use the mode programmatic access to shared Variables and it would work.

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

  http://zone.NI.com/reference/en-XX/help/371361G-01/lvconcepts/usingdynvarapi/

• LCCS Screenshare-how the shared screen?

  Hi all,

  IM new to ACC, ACC to do application sharing screen using Flash Builder 4.I have used session.streamManager.maxP2PStreamPublish = 20;    session.streamManager.streamMulticast = true to publish my screen, how can I view the shared screen from another system? I have to use the Subscriber in another system to display split screen? Can someone help me please...

  . Thanks in advance

  Duva

  Hi Duva,

  Have you tried to use the screen sharing SampleApps? You can download them from our browser SDK. Within the 'ScreenShareExample' folder 'ScreenSharePublisherExample.mxml' and 'ScreenShareSubscriberExample.mxml' , which I think might help

  Here's the info from the Readme about these examples:

  ScreenSharePublisherExample: This example shows how to publish his screen and share it with other subscribers in the same room which has its publisherID. When to invoke this editor, Adobe screen sharing Addin will appear and a sharing dialog box will pop up asking what view/app to share.  Upon confirmation,.
  the streamID and the publisherID will be displayed on the Center textfields.  Use the publisherID on the screenshare subscriber see the screenshare.  (Please check the account and roomURL information before using the editor)

  ScreenShareSubscriberExample: With information on the right and roomURL, this application will connect to the first publisher of screen sharing in the room (you don't need to specify the publisherID).

  Here are a few good pages with ScreenSharing to information you might find useful as well:
  http://learn.Adobe.com/wiki/display/LCCs/08+audio%2c+webcam%2c+and+screen+sharing
  http://learn.Adobe.com/wiki/display/LCCs/8.3+screen+sharing

  JG
  Quality of SUPPLY engineering

• How to use the shared variables to address several Watlow controllers on the same COM port

  Hello

  I am using LabVIEW 2010 to control 4 Watlow temperature controllers on a port com 3 are model 96 and 1 is a zone EZ controller. The controller has a unique modbus address and I'm trying to read from and write in the individual records (for example, setpoint closed-loop) variable shared help. I would return the data during playback (even if the data is displayed as invalid), but I am unable to change the value in the registry in writing. How can I be sure that's the Modbus server send commands to the correct controller?

  Chuck

  Hi Chuck,

  Sorry for the delay in response, I was away last week. You can create as many servers for Modbus on one COM port that you would like, the only problem you'd see is if you tried to call the port from different locations at the same time. With respect to the documentation to cross, I'd start with the tutorial below for a comprehensive manual of Modbus. There are also quite a few listed under Datalogging and supervisory control Module help topics that may be useful if you want to solve specific issues.

  Introduction to MODBUS

  Kind regards

  Peter W.

• OPC server in the shared variable

  Hello

  I am writing a program to read hundreds of OPC signal from a server. The server is a localserver in the PC, but this isn't a Labview server. My labview program reads the signal from the mutual FUND through the data in a Labview library. (Variable type = single process)

  This way is functional but not optimal. I read in the help that I can use a published shared network variables. Is published this network can read the signal from my server through a network path without use of data? He will need a Labview Server?

  This is an example for my opc address

  OPC://localhost/hteControl_OPC_DA_Server/PLC_FI010_ValueLimit_SP

  Thank you

  fmpfmpf wrote:

  Hello

  I am writing a program to read hundreds of OPC signal from a server. The server is a localserver in the PC, but this isn't a Labview server. My labview program reads the signal from the mutual FUND through the data in a Labview library. (Variable type = single process)

  This way is functional but not optimal. I read in the help that I can use a published shared network variables. Is published this network can read the signal from my server through a network path without use of data? He will need a Labview Server?

  This is an example for my opc address

  OPC://localhost/hteControl_OPC_DA_Server/PLC_FI010_ValueLimit_SP

  Thank you

  LV - DSC (data logging and control) words allows you to "bind" the NSV to an OPC server.

  As long as the compliant OPC server operating system it should work and has been the case for me.

  Ben