ABB 615 Series ANSI Manual page 42

Section 3
Vendor-specific implementation
36
Reading out more event records than are available in the internal event
buffer
The requested amount of event records is always returned for reading. For example, if 10
event records are requested, but the IED only contains five event records, the last valid
event record is repeated (duplicated) in the last five event records returned. The easiest
way to detect the duplication is to check the sequence number of the event records. The
sequence numbers remain similar to the duplicated event records.
1MAC052634-MB D
615/620 series ANSI
Communication Protocol Manual