52 NFS2-640 Operations P/N 52743:L4 06/10/19
Read Status Operation Viewing and Printing a Read Status
4.4.2 How to View Read Status for Event and Alarm History
Overview
The control panel maintains a History buffer of the last 800 events, each with a time and date
stamp. History events include the following:
• All alarms, troubles and operator actions, such as: Acknowledge, System Reset, Signal
Silence, Drill, and Walk Test.
• Programming entries (Program Change and Status Change, but not Read Status), along with a
number (0-9) indicating the programming submenu (for example, 0=Clear). For an example,
see Figure 4.18.
You can view events from the History buffer in two forms: by displaying all events (option 2,
HIST=2) or by displaying alarm events only (option 4, ALARM HIST=4).
How to View Read Status for Event History
Option 2 (HIST=2) lets you view the total number of events in the History
buffer (up to 800 events), then view each event in chronological
sequence. From the “Read Status” screen, press 2, then press the
ENTER
key to display the “Event History” screen. A sample of the Event History
screen is shown below:
Figure 4.16 Sample Event History Display
To display events in the History buffer, do the following:
• Press the
NEXT SELECTION key to step through each event from the first entry (oldest event
first) in the History buffer, or
• Press the
PREVIOUS SELECTION key to step through each event from the most recent entry in the
History buffer.
A sample LCD display for a trouble event:
Figure 4.17 Sample Trouble Event Display
NOTE: The History buffer contains 800 events total, including the alarm events that display for
Alarm history. The control panel generates Alarm history from the alarm events that exist in the
800-event History buffer.
The number of events in the History buffer
EVENT HISTORY START
EVENTS IN HISTORY: 550
NOTE: The NEXT SELECTION key will show the most recent event first, and then move to its
normal function of displaying the oldest events first.
Time and date of the event
Type of trouble
Type of event
TROUBL IN SYSTEM GROUND FAULT
01:46P 041508 Tue
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