Function of dll to interface with struct in LabVIEW

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  I am trying to connect with a block of Festo, but I can't. Here are the details:

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  Hi Jesse,.

  I'm not entirely sure what the specific problem was. I kept getting strange behavior. Errors in LabView and on my camera from Festo. The EDS files change. So, I did as any natural born THERE would be worker, I rebooted.

  Here are the steps I used to get this project going. In doing so, I found that to set up a DeviceNet device in LV2012SP1, no need to manually enter the data in file EDS. There is a tool to load files EDS. It dealt with issues I had in the previous Forum posts: here about loading files EDS in LabView and here regarding setting up a DeviceNet network.

  Environment: Windows 7, 64-bit processor. IndComm 2.2 pilot. LabVIEW 2012 SP1

  Starting with the example LabView project: "Devicenet PXIPCI Basic.lvproj.

  Add a DeviceNet master to a LabView project

  1. The project: right-click on my computer
  
  
  1. Select new
  
  
  2. Select the targets and the device (s)
  
  
  2. Select the option "discover existing devices.
  
  
  3. Select the discovered device.
  
  
  4. Click 'OK' (Note: in this case, my master is a card PCI of NOR-8532)

  Add a DeviceNet slave device to a LabView project

  1. Right-click on the master device newly added in the project tree
  
  
  1. Select new
  
  
  2. Select the targets and the device (s)
  
  
  2. Select 'discover existing devices.
  
  
  3. Select the discovered device.
  
  
  4. Click OK. (Note: in this case my slave is a block of Festo CPX-FB11.)

  Load an EDS file to the slave device

  1. Right-click on the slave device
  
  
  2. Select "Sheet"... »
  
  
  3. Click on add files...
  
  
  4. Navigate to the location of the EDS file.
  
  
  5. Select the file.
  
  
  6. Click OK.
  
  
  7. In the left pane, expand the data sheet newly added up to reach the node displays the version.
  
  
  8. Select the version.
  
  
  9. Click OK.

  Check the device and file EDS

  1. Right-click on the slave device
  
  
  1. Select utilities
  
  
  2. Select the Panel of Test online
  
  
• Select the option 'Device status' in the field of category on the left.


• On the right, select the slave device, you want to check.


• Click on "check the device".


• Read the errors/warnings or lack thereof.

In my case I had errors in my EDS file. Basically the slave device was not defined for the correct number of bytes of input/output in the EDS, i.e. a wrong configuration file. To fix this I had to change the EDS file.

Edit the file EDS

To change the EDS file, I used EZ-EDS , which is a freeware, devicenet specific EDS editor of ODVA.

I did my corrections and saved my file EDS. (After having saved my original, of course).

Remove the installed Labview EDS file

1. Navigate to the following location: C:\ProgramData\National Instruments\NI-IndComm for DeviceNet\Datasheet


2. Remove the sheet (Note: there is more that one datasheet added manually.) Additional EDS files come with the IndComm driver. Find the EDS file for the specific device that you want to replace and delete).

I restarted LabView.

I went through the steps above again and loaded my new EDS file.

I saved the project and came out of LabView.

I rebooted the computer and the slave device.

I restarted the project and launched a VI.

I was able to communicate with the device. That is something that I had not been able to do before. And, in doing so, I discovered how the device speak and why were not each module. (I have a standard for my block devices EDS file, as it appears that LabVIEW is not capable of a modular system that requires an EDS file for each module. I could be wrong on that last part though, as there may be a setting on my real device. But it is unecssary in my project. So I do not consider this further.) Because I was using a standard file of the EDS, only a single slave device showed, and so the data for each module are in the stream of bytes returned to the DeviceNet network. Addressing each module is a question of analysis the bits and the bytes appropriate.

Thank you

Tennessee Paul

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• A module C - DAQ exists which will interface with standard RV - C?

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• Functions of DLL Labview only each returns 0 when it is called in C

  Hey guys. I'm having a problem using a dll built in labview in my code C. I did a labview program that read the current analog signals 7 analog pins and them stored in a table. Then I have a variable that corresponds to the index that you want to localize (whenever the function is called I don't read only one current value of the table) and then put this value into a digital indicator that is the result I want.

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  Indexing by a double seems to be ok in Labview. I understand the problem however. The labview functions actually worked, I was just incorrect printing. I was really stupid and my printf statement was printf ("%d", value) printf ("% lf, value) which is what you need for the double rooms, and he did print always 0. Thanks for your help though guys.

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