PMON will issue an alert for a small series of errors. These error messages are explained below.

PMON ALERT	MEANING
OBSID XXXXX FLIGHT S/W VERSION = XX	The expected flight software is not running, version XX is loaded.
OBSID XXXXX THRESHOLD COUNT LOCKED BY FEP_X	FEP_X has a threshold count lock.
OBSID XXXXX BIAS ERROR THRESHOLD EXCEEDED BY FEP_X	FEP_X has execeeded the bias error threshold.
OBSID XXXXX FATAL_RTXERROR	Fatal error on the BEP's RTX processor.
OBSID XXXXX FATAL_EXCEPTION	Fatal Execption in BEP.
OBSID XXXXX FATAL_INTERRUPT	Fatal Interrrupt in BEP.
OBSID XXXXX FATAL_FEPDEVICE_BAD_FEPID VALUE	Fatal FEP error.
OBSID XXXXX FATAL_TASK_EXIT	Fatal BEP task exit value.
OBSID XXXXX FATAL_RTX_RETURNED	Fatal return from the BEP RTX.
OBSID XXXXX FATAL_INTR_FEP_BUS_ERROR	Fatal interupt/FEP bus error.
OBSID XXXXX UNKNOWN FATAL ERROR VALUE	Unspecified Fatal error occurred.