This enumerated bitmap value indicates which of this PSU's configured input thresholds, such as high or low current/voltage, are currently being exceeded. This is the field UCS Manager's fault engine consults to decide whether to raise a fault against this specific PSU's input feed, so an admin investigating an active PSU fault checks this bitmap to see exactly which threshold, over-current versus under-voltage for instance, was crossed. A value of 0 means no thresholds are currently crossed for this PSU's input; a nonzero value corresponds to a specific combination of crossed thresholds such as input-voltage-low.