August 2013 3-4 P/N 06-236530-001
3-2.4 Status Indicating LEDs
Table 3-3 lists the names and functions of the system status LEDs on the display.
Table 3-3. System Status LEDs and Functions
LED COLOR FUNCTION
Power On Green A steady LED indicates primary AC power is on at acceptable levels.
An unlit LED indicates unacceptable AC power levels or AC power is
disconnected.
Alarm Red A flashing LED indicates one or more unacknowledged alarm events, or that a
previously-acknowledged non-latching alarm device has issued an alarm-off
report.
A steady LED indicates all alarm events and alarm-off reports have been
acknowledged.
The LED turns off when the control unit is reset if all current alarm events and
alarm-off messages have been acknowledged and none of the alarm-initiating
devices are reporting alarms.
Pre-Alarm Yellow A flashing LED indicates unacknowledged pre-alarm events.
A steady LED indicates all current pre-alarm events have been acknowledged.
The LED turns off when the control unit receives pre-alarm-off messages from
all alarm-initiating devices that had reported a pre-alarm.
Trouble Yellow A flashing LED indicates unacknowledged trouble events.
A steady LED indicates all trouble events have been acknowledged.
The LED turns off when the control unit receives trouble-off messages from all
SLC or IIM devices or control-unit monitoring circuitry that had reported
trouble conditions.
Supervisory Yellow A flashing LED indicates one or more unacknowledged supervisory events.
A steady LED indicates all supervisory events have been acknowledged.
The LED turns off when the control unit receives supervisory-off messages
from all initiating devices that had reported supervisory conditions.
Silence Yellow A steady LED indicates the Silence Key has been pressed after all current
alarm events have been acknowledged.
The LED turns off when 1) the control unit is reset, or 2) the Silence key is
pressed to toggle on any previously-silenced NACs and SLC-based modules.
The Silence key will repeatedly toggle the NACs and SLC-based modules off
and on and the Silence LED will track the activation state of the NACs and
modules until the control unit is reset.
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