LabVIEW Front Panel Indicators Not Updating

Updated Dec 17, 2020

Reported In

Software

  • LabVIEW

Operating System

  • Windows

Issue Details

  • I have a VI that is no longer updating the Front Panel indicators. Some subVIs in the code are showing the same behavior.
  • I have a VI within a Project Packed Library (PPL) that is not updating the Front Panel indicators.

Solution

Sometimes a VI can become corrupt and not work as intended. This article provides steps to narrow down and solve the issue.
  • Use traditional debugging tools in LabVIEW such as Highlight Execution and Probe Tool to verify the values going to the indicators are correct.
  • Create a test VI with dummy variables to see if everything works as expected.
  • If you have a previous version of the VI, test to see if that behavior is happening in the old version. It may be helpful to revert to a previous version of the code.
  • Copy and paste the block diagram into a new VI to see if the strange behavior repairs.
  • Try mass compiling the code or forcing the VI to recompile.
  • If the issue occurs with a VI within a PPL, try a force recompile of the VI and rebuild the PPL.