You can wire directly from a terminal outside a structure to a terminal inside the structure. LabVIEW creates a tunnel where the wire crosses the structure boundary. A tunnel allows data to flow in and out of loops and structures.

Wiring to Avoid

Avoid the following when wiring structures:

  • Overlapping tunnels.
  • Wiring from multiple frames of a Stacked Sequence structure.
  • Failing to wire a tunnel in all cases of a Case structure.
  • Assigning more than one value to a sequence local terminal.

For structures wired to only constants, LabVIEW uses constant folding to optimize performance. You can configure LabVIEW to display hash marks inside constant folded structures by selecting Tools»Options»Block Diagram and placing a checkmark in the Show hash marks for constant folded structures checkbox in the Block Diagram page.