This variable represents the sequence number of an event.
Sequence number is incremented monotonically starting
from 0 until it reaches its maximum and wraps around back
to 0.
Sequence number is incremented when
- the state of a normal type fault is set on (the same sequence
number is present in the events table as well as in the trap
that is sent to notify about the fault on event)
- delta event occurs (sequence number present in trap message)
- the state of a normal type fault is set off (sequence number
present in trap that is sent to notify for clearing).