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LabVIEW behaves differently in terms of how breakpoints are highlighted and when execution pauses dependent on where you have placed breakpoints on the block diagram. You can place breakpoints on structures, nodes, or wires.

Structure Breakpoint

The following illustration shows a For Loop with a breakpoint. The VI pauses before the entire For Loop finishes executing. A red border around the block diagram highlights the breakpoint. If the block diagram is inside a structure, the structure includes the red border. The pause in execution occurs when all nodes on the block diagram finish running. If a breakpoint is in a loop structure, the pause occurs after each loop iteration.

Node Breakpoint

The following illustration shows a breakpoint on the Increment node. The VI pauses before the Increment function runs. One wire also has a breakpoint. The VI pauses again after the Multiply function executes. A red border around the node highlights the breakpoint. The pause in execution occurs just before the node executes. You can probe all the input signals into the node with the Probe tool.

Wire Breakpoint

The following illustration shows a breakpoint on a wire with an attached probe. When you have selected Retain Wire Values and you place the cursor over a wire, a tip strip appears, as shown, that includes the value of the data in the wire. The pause in execution occurs after data pass through the wire and the probe displays the data from the current iteration. A red bullet in the middle of the wire highlights the breakpoint. If you attach a probe to the wire, the probe also has a red border.