How to implement logical equations such as LabView?

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• How to implement the wafer map using LabVIEW?

  Hello LabVIEW Masters!

  I have a project which includes control and searching for information on a PROBER. One of the difficulties I have now is how to implement a WAFER card using LabVIEW. According to the requirements of my client, the element of pads varies between 6 k and 23 k. I guess that do everything (a = a ctl/indicator led) will be a hell of a task, especially on how to effectively manipulate each elements. Does anyone have a better idea on the way whose that?

  Please, I seriously need your help...

  Thank you and best regards,

  Dennis DG

  Hi Dennis,

  This wafer GerdW post card appears to me as a sort of histogram (for example http://www.ni.com/white-paper/4158/en#toc3);

  Altenbach post well this example that shows how to use a plot of intensity to create a 2d histogram:

  http://forums.NI.com/T5/LabVIEW/overlay-plots-as-intensity-graph/m-p/211222#M119248

  Learn how it works and try to adapt it to your specific task.

  Alex

• How to implement interfaces or inheritance in LabVIEW?

  Hi all

  I try to implement oriented OBJECT in my LabVIEW code and require heritage or just an interface (such as might be required in java).  I have a good knowledge of OOP is just how do me in LabVIEW, I'm curious.

  I'll try to stick with my own example for now, so that someone is able to tell me exactly how to implement this.

  in any case, I have two different DMM and each come with their own GPIB commands to get the measures and set the measurement configurations.  This seems to be a perfect example to learn how to use inheritance.  I figured out how to make a class for each DMM but was curious as to how I might be able to create a parent class for each of them because they both require the same fields in their configuration (AC/DC, Measurment Type, rank, address VISA).  I think that I could create a parent class with these fields, then the methods of use of these fields and have then child classes inherit fields and override the methods of the parent class so that depending on what the user selected DMM, it would be able to use the correct class to issue the right GPIB commands.

  If anyone can point me to a good example or explain how this could be implemented in labview that would be super.  I'm also browsing the forums LVOOP to LavaG trying to figure this out, thanks!

  Brent

  Brent,

  LabVIEW help contains a lot of detailed information on the use of classes.  I recommend reading through it, before we begin with OOP in LabVIEW.  In the content of the Help window tab, search for "Fundamentals > LabVIEW Object - Oriented Programming > How - to's»  There is an article entitled 'change the legacy of a LabVIEW class' that should be what you're looking for.

  Chris M

• How to implement the service as thread know app without a head?

  I want to implement some service such as GPS log app, SMS Firewall. I want just an expert to give some guidance on how to design app without head and how to interact without head with front UI thread?

  There is a documentation for it: here.

  Examples of applications: Collector Push and part of Xandroid UI/Xandroid part Headless

  Personally, I could not work from collector to push but the Xandroid works according to others.

  I tried to do a UI + app: separation logic and tried invoking the logical part on the system started but could not make it work too.

  If your application without head needs long running and is not triggered, you must submit a form to the https://developer.blackberry.com/jam/headless/

  I really hope that internal developers to release a simple beginning on the kind of Hello world system early in the example, two examples of applications are too complicated and are trying to squeeze too many different features together

• How to implement Canopen on FPGA to run the engine using NOR-9881?

  Dear,

  Your support will be highly appreciated,

  There is only one available for NOR-9881 example.
   
  Please note that the following materials were properly connected:
  cRIO-9024, cRIO-9113, OR-9881 and motor Nanotec (SMCI36 against L2818L0604-T5X5), the following
  sites Web shows the engine Nanotec in details:
   
  http://us.Nanotec.com/products/660-L28-linear-actuators-with-trapezoid-spindle/
   
  http://us.Nanotec.com/products/1041-SMCI36-stepper-motor-and-BLDC-motor-position ing-control /
   
  The main problem is how to configure the inputs and outputs, where, in most examples, the entry and exit have been automatically
  configured.
   
  the following three examples and I wonder how to start:

  1 - example Nanotec: dependent VISA controls for data transfer
   
  http://us.Nanotec.com/support/application-notes/LabVIEW-example/
   
  2 - reference example CANopen for series C OR - 9853 Module CAN:
  the NOR-9853 has default Can0 which was used in the code

  http://zone.NI.com/DevZone/CDA/EPD/p/ID/6093
   
  3 - from finder labView example: search for 9881 then choose
  NOR - CANopen_cRIO.lvproj, which depended on SDO orders for transfer orders
   
  The attached picture shows that NEITHER-9881 can be seen, after compilation and
  loading the bitfile FPGA.
   
  Please, please advice me:
  1. how to start?
  2. how to create variables of entry for NI9881?
  3. how to implement CANopen mode FPGA? where there is no CANopen palette.

  Thanks in advance and

  Hello!

  From my understanding, the 9881 can be treated from the FPGA, but only from the application of the RT. I think that the point 3 of your post examples of the use of the module fine.

  Kind regards

  Georg

• How can I synchronize two signals in Labview?

  The first signal is a pulse index which gives the position of a reference point of the wheel (= 1 for 0 ° and signal = 0 for 1-360 °), and the second signal gives the total force meeting the wheel. The two signals have different sampling rates high. The first signal is always 360/rotation, but the second signal varies from cycle to cycle based on how fast the force is changing. The signals are in the form of two columns of numbers in an excel spreadsheet.

  I would like to do such as Labview at the exit of the angular position of the reference at the time of the cycle where the wheel knows the maximum strength in degrees. Can anyone suggest a vi or a method that I might be able to use for this task? I am new to Labview, so any help is appreciated.

  Hi Westerman,

  I have a little trouble to understand the basics of what you're trying to do. A little more details would be very helpful pointing you in the right direction. If you want to align the timestamps/reference of the two signals time?

  I've included a link to a document that describes generally how encoders (I guess that your pulse index indicates that you are using an incremental encoder) can be used in LabVIEW.

  http://www.NI.com/white-paper/7109/en

  You should also try the search the forums for questions relating to the use of a rotary encoder in LabVIEW. I was able to find several with the included code example.

  Feel free to provide us with a few details and we'll help guide you.

  Andy C.

  Technical sales engineer

  National Instruments

• How to solve an equation that has integration

  Dear Sir.

  I need to implement an equation like below:

  

  I have checked several VI mathematics and box tools treatment but unable to fulfil my obligation of signals. Kindly help me with suggestions.

  with respect,

  Sri

  This isn't really a question of LabVIEW, but a simple calculation a.

  The integral show you is a definite integral between values: 0 and 'b '. I guess that the 'a' is a constant value, so just integrate it by the variable 'b', simply by using the rule of the definite integral:

  -2 * a * (b - 0) = - 2ab.

  So if you have the value of a and b, you can use just to function multiply in LabVIEW.

• Implement the json JWT with labview web token

  I need to implement of JWT authentication with labview, how can it be done?

  I'm not aware of an existing library of JWT for LabVIEW. You can see the site of JWT to the creation and analysis of JWT requires:

  JSON encoder / decoder

  base64 encode / decode

  and a signature / encryption method (commonly built HMACSHA256 depends on the Oracle application)

  JSON encoding and decoding is available for LabVIEW 2013: https://zone.ni.com/reference/en-XX/help/371361K-01/glang/flat_unflat_string/

  The other two are not available of NEITHER, but have implementations in the LabVIEW community:

  Base64:

  https://decibel.NI.com/content/docs/doc-5544

  https://decibel.NI.com/content/docs/doc-23233

  Signature:

  https://lavag.org/files/file/198-encryption/

  https://decibel.NI.com/content/docs/doc-22585

  If unfortunately JWT support is not provided by default, but all the necessary parts to the realization that he should be here.

• How to implement the ScreenUiEngineAttachedListener Interface?

  How to implement the ScreenUiEngineAttachedListener Interface? It is somewhat a mystery reading through the API.

  I have a class that implements ScreenUiEngineAttachedListener:

  public class UiListener implements ScreenUiEngineAttachedListener {
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  private void removeScreenUiEngineAttachedListener() {
  
  }
  

  • What is the correct positioning of everything?
  • Can I define an instance of UiListener and pass in the addScreenUiEngineAttachedListener?
  • How to remove UiListener in removeScreenUiEngineAttachedListener?

  You will need:

  • an instance of your UiListener - probably a static member inside your UiApplication;
  • a method that allows to retrieve the reference to this instance of UiListener;
  • a call in your constructor for the screen at addScreenUiEngineAttachedListener (yourApplication.getUiListener ()) or similar;
  • potentially a call within your onScreenUiEngineAttached (attached screen, boolean) routine, the branch (attachment is false) : screen.removeScreenUiEngineAttachedListener (this);

  However, all this is too much work for no gain. Just override protected void onUiEngineAttached (boolean attached) in your screen class and make your logic there - all members of your class are accessible and all the code is placed where it belongs.

• How to use logical operators in Essbase Studio?

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  Him == and! = are to establish conditions of filtering. the! me not. In esscense they allow you to get a subset of the rows that meet the specified conditions. In your case where sex is "M", you will get only the rows where the value is "M". What you want to do is transform lines do not filter them. I have not looked at the studio enough yet about how to proceed, but a few things come to mind. First, you can use the text to create the contour compatriots Menbers rather values of the tables, you could Crete a table of reference with M = males and F = female and join him for the values or you can use a standard charge rule and sql interface to load the data and simply build the dimensions and piercing Studio. I think I would opt for the second option

• How to make logical AND and or in the IF statement

  Hi all
  I use Oracle 10 g and I want to implement logical AND and OR in the IF STATEMENT how can I do?
  
  Thanks in advance :)

  I don't see what that has to do with the forms, but let's go anyway:

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  THEN
  ...
  

  You can do hundreds of combinations, so it is impossible to tell what you statement should be.

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  I managed to develop filters of fixed point that suits my needs, but I don't know how to implement on a table in a project after the FPGA code generation. I tried to understand it in the examples, but I was not very successful.

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  I've already done that and solved the problem.

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• How to change a file lvproj in LabVIEW?

  Hi all

  I have a complex project with a number of specifications of generation.  Each of these build sheet has the inside version number in several places.  Opening each build specification takes looooong for LV to treat, so the chore of bumping the version numbers on this project is a major pain.

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  The XML code is still valid? I think you can tell by opening it in Internet Explorer. Simply make a copy of your .lvproj with the .xml extension and do a file/open in Internet Explorer.

  How can you "Find and replace" in LabVIEW? You use the features in xml?