Value of cluster lost when you leave the structure of the case

Hi all

I'm having a problem with a particular VI I'm working. (FYI it's in Labview 8.0)

The VI is set to run a current source, voltmeter and thermometer, then recording and graph the data in various ways that can be selected by the user.

Everything seems to work fine except a particular graphic method. When I try to graph current compared to the tension, the current value is lost estates. In a case the current and voltage are combined to form a cluster, and then leave the case structure to be later appended to a table of cluster.

However, the value of the cluster is lost when the chart is set for the voltage vs. Any other method and it works correctly.

I can't understand why this is happening as it does not make much sense than other methods of work charts, but this one isn't when it is coded the same exact other than having the different variables.

I have attached the VI with added indicators showing that the value of cluster is lost once he leaves the box structure. Any help would be appreciated.

Thank you very much and I apologize for my extremely messy VI.

-Nathan Cernetic

You really need to boil this down to something we can run and reproduce the problem.

Have you tried to break a few relevant connections and rewire? Something is possibly corrupt.

Besides being a mess, your VI has quite a few glaring errors.

Let's take a look at the structures at the top right:

  • 90% of the code is the same in all the structures of three cases, so all that needs to be inside the structure is the small part where you built the table 2D. All the rest is outside of the case.
  • The structure of the sequence has no useful function.
  • Why do you need to reverse the table with each iteration of the small loop FOR? Once before the loop would be sufficient. Right?
  • Why you use table built inside the small loop FOR, but no autoindex on the edge of the loop? All you ever get is an array containing exactly one element, no matter how the loop runs. Seems unnecessary! (see below for an alternative image).
  • You wouldn't even need to reverse if you want to use "built the table" instead of "insert into the table at position 0" in the central part.

Other: You constantly hammer all nodes of your property. The only need that will be called when things change. Again, you have far too many cases. For example, in the structure of the case where you are having problems, the same nodes of property exist in all cases. A single instance of the property node belong outside the case and only the string inside each case constants. Whenever the code is the same in all cases a case structure, which code belongs to the outside!

Tags: NI Software

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