Date Code 20020129
Serial Port Communications and Commands
7-19
SEL-387E Instruction Manual
The
GRO
command does not clear the event report buffer. If the active group is changed, the
relay pulses the ALARM output contacts and generates the following automatic message:
XFMR 1 Date: 03/13/97 Time: 14:33:49.109
STATION A
Active Group = 2
=>>
Note:
The relay will be disabled momentarily while the change in groups takes place.
HIS (History of Events)
Access Levels 1, B, 2
The
HIS
command displays the 99 most recent event summaries in reverse chronological order
(most recent event at the top, with lowest event number “#”). The number of full Event Reports
completely saved in Flash memory depends on the SET G setting LER as follows:
LER
Setting
Number of Event Reports Stored
15
cycles
18–21
29
cycles
12–14
60
cycles
7
Each summary shows the date, time, event type, active setting group at the time of the event, and
relay targets.
Event types, in decreasing order of precedence, are: TRIPn (n = 1 to 4), CLSm (m = 1 to 4), ER
(SEL
OGIC
control equations event trigger), PULSE (user-initiated momentary contact operation),
and TRIG (user-initiated triggering of an Event Report). If more than one event type occurs
during the same event, the type with highest precedence will be displayed in the EVENT field of
each line of the display.
Enter
HIS n
, where n is a positive number (1 through 99), to limit the history report to the most
recent n events. The history is stored in nonvolatile memory, so it is retained through power
failures.
The date and time are saved (time to the nearest millisecond) and referenced to the trigger row of
data in the Event Report.
An example of the display appears below. In this example seven events have occurred since the
history was last cleared:
