Stupid mistake with Bundle by name

I recently spent too much time to research an error in the code "that used to work.  So I asked a student to look over my shoulder while I explained what was supposed to happen.  The bug is illustrated in this code snippet:

I do a simple package by name, using a predefined TypeDef to define the cluster.  What I expected to get are indicated on the left, and I have actually is shown to the right.  The code looks the same, but the result is very different!

My student asked innocently if I saw, in fact, the default value of my TypeDef (answer - Yes).  He then asked if I had connected the TypeDef to the terminal of output "by mistake."  This turns out to be almost right - what I did was to wire the flag, not the Terminal output, but by mistake, to the input Terminal.

Note the two beige rectangles on the right edge of the boot by name.  The rightmost output, the more to the left is the entrance (this is where the wire to TypeDef comes in).  What I carelessly did was drag a wire from the indicator "far enough" to establish a connection, but, in fact, I dragged too far for that its entry into the entry box.  Here's big plans to correct and bad sons with highlight - it is not easy to see, but the highlighting on the wrong wire extends into the beige rectangle to the left.  If you bring your pointer in very carefully at the junction, you can sometimes see a point of strain on the edge of the function of the bundle, but I couldn't catch him.

   

Needless to say that this behavior, the ability to 'evil' a bundle by name function wire, was quite unexpected (by me)-I spent most of my time, suspecting of subtle errors in my code and logic, not the errors of cabling!

You can bet I checked the other places where the beam by a name appears in my code.  I'm posting here in the hope that others do not fall into the same trap.

Schor (embarrassed) Bob

Sorry to beat a dead horse, but I wanted some close this topic and comment on some of the useful responses.  A revised version of the extract is also included below.

  • Oligarlicky and tst are correct - I must have inadvertently 'fixed' the original extract before posting, as the code snippet below show fact error (I tested this time!).

  • TST is also correct that having the Option "Enable automatic wire routing" is enabled (the default behavior) would prevent this problem, with the result the obviously involuntary wireframe diagram of Test 3.  I always disable this Option when I am configuring LabVIEW, I like to control the placement of wire.

  • Many sons of "misplaced" (or incorrect) seem to be "taken" by the VI Analyzer, so I 'analyzed' this VI.  When I read his conclusions, I said "Oh, he missed the error!  But I was wrong - included an annotation of unused Code that says "service"Bundle by name"has none of its outputs one cable and therefore performs so no useful operation.»  Consider removing this function from your schema. "It was not really until I've created version 'Activate the automatic routing of the wires' reproduced by 3 tests that I realized he was talking (somewhat loosely) on my thread wrong.

  • One of my colleagues said I should stop wiring "in Hebrew" (creation of my son from right to left) - which could also prevent this error, but I prefer the "Ambidextrous" style of wiring, which means I'm leaving of whatever connection I happen to be nearby and the driver to the everywhere where it should go.

I hope that I can remember these lessons six months from now...

Bob Schor

Tags: NI Software

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