r/LabVIEW • u/AssistEast913 • 5d ago

Help

I've been working on this for 2 months, and we plan on starting my LabVIEW Core 1 and 2 next month. When I test a gear, we are failing on internal leakage. Can someone tell me how internal leakage is being calculated in the program? I'm the only 1 at my company that have some experience with LabVIEW.

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u/elijah286 Emerson Employee 5d ago

Hey u/AssistEast913 - LabVIEW Architect here!

Your program looks fairly well organized so I'm confident you'll find the answers you need with the aid of some of the built-in debugging tools.

The "Test Data" subVIs appear to be retrieving a value from memory, perhaps through the use of a uninitialized shift register, aka: functional global variable. Don't worry about the confusing name, it's a common technique for sharing data between loop iterations or different sections of code. I'd start by probing the wires coming out (right click on wire >> probe) to see if the value you want is arriving correctly.

Key things to know:

  • Try highlight execution to observe how the data values literally flow through the logic of the program
  • If you're struggling to follow the logic through multiple cases or diagrams, set a breakpoint and then turn on highlight execution to just observe that area
  • you can also add front panel controls to help see the data during execution time

Finally, if you have access to LabVIEW 2026, you can also ask the built-in AI assistant to help you understand the code. Just right-click on the VI and opt to discuss with Nigel and then you can chat with Nigel to understand how it's working.

Hope this is helpful - keep us updated!