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Concatenating Tunnel Mode Wire Broken When VI Is Saved to Previous LabVIEW Version

Updated Nov 29, 2023

Reported In

Software

  • LabVIEW
  • LabVIEW NXG

Issue Details

I created a program using the Concatenating Tunnel Mode of the case structure in LabVIEW 2021. 
Then I saved the program as LabVIEW 2020 version by Saving for a Previous Version.

But, when I open the saved LabVIEW 2020 program, the Concatenating Tunnel Mode part of the case structure 
is broken and have error of You have connected two arrays that mismatch.
It is found that the Concatenating Tunnel Mode feature is possible only for the string data type in LabVIEW 2021.

LV21.png

LV20.png

Hence, what is the cause of this behaviour?
Is this a new feature that will be available in LabVIEW 2021 and later versions of LabVIEW?

Solution

The Concatenating Tunnel Mode functionality for strings was added starting in LabVIEW 2021. 
Thus, when saving the VI from LabVIEW 2021 to LabVIEW 2020, it is an expected behaviour.

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