The 'FDUL221-EL' menu allows the saved topologies to be uploaded on to an FDUL221 with EL firmware. This allows all the data to be saved in a file. The file must be loaded using the 'File' > 'Open' (Ctrl+O) command. If several topologies are present on the file, a dialog is displayed which allows a choice between the individual topologies.

This can be edited in the normal way (additional information, export, etc.). It can also be saved in standard file format, which should be done so as to safeguard against loss of additional information that was input manually.

The procedure 'File' > 'Open' (Ctrl+O) must be repeated for all topologies contained in the file.