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You can perform datalogging automatically or interactively.

Complete the following steps to enable automatic datalogging.

1. Select Operate»Log at Completion to enable automatic datalogging. When automatic datalogging is enabled, a checkmark appears next to the Log at Completion menu item. Select Operate»Log at Completion again to disable automatic datalogging.
2. Run the VI.

You also can use the Log at Finish property to enable automatic datalogging programmatically.

The first time you log front panel data for a VI, LabVIEW prompts you to name the datalog file. LabVIEW logs data each time you run the VI and appends a new record to the datalog file each additional time you run the VI. You cannot overwrite a record after LabVIEW writes it to a datalog file.

Complete the following steps to perform datalogging interactively.

1. Run the VI whose data you want to log.
2. Select Operate»Data Logging»Log after the VI stops running.

If this is the first time you are logging the front panel data for this VI, LabVIEW prompts you to name the datalog file.

Note  A waveform chart logs only one data point at a time with front panel datalogging. If you wire an array to the chart indicator, the datalog file contains a subset of the array the chart displays.