The NI-FBUS 3.1 FFLV VI library does not support showing live list of devices so far, you have to run TagEditor to find the corresponding device tag and address for each device.
But the new VI library (ver 3.1) supports VI to get device ID, please refer to the description of "FF_GetDeviceID.vi" in "NI-FBUS 3.1 VI" Help file for more information.
You can visit "www.ni.com/support/fbussupp" to download the latest NI-FBUS Communications Manager 3.1 to have these new VIs.