You can configure a VI to retain wire values on the diagram so that when you create a probe, the probe displays the most recent data that flowed through the wire at the last VI execution.
Retaining wire values can help you debug a VI when a diagram is complex and you need to view specific wire data after a VI finishes executing to determine where an error occurred.
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Click the Retain wire values button on the document toolbar to start retaining all wire values on the diagram.
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Run the VI at least once so that wire values are immediately available to any probes you create.
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Place a probe on a specific wire by right-clicking the wire and selecting Set probe. To see the most recent value of the data that passed through the wire, either hover over the wire or click the probe.