How are you connecting the 1127 to the switch controller, cable, adapter etc?
What is your switch controller?
is the chassis in traditional DAQ or DAQmx?
Was the 1127 ever recognized?
Is the chassis on?
If you get "Failed to find the SCXI-1127 in slot..." it means that the 1127 was at least recognized once (in order to appear in the chassis in MAX the first time) and that you lost communication with the chassis when you tested it.