TM0064
Page 32 of 91
Issue 2.01
2.2
DEVICE INDICATIONS
The Slave Processor scans each address and determines which type of unit is connected at each
location on each of the two loops.
This data is used for subsequent scanning of the addresses in order to control and obtain
information from the device correctly. This information is also passed to the main processor for
display control. For all units, the information received indicates whether the device is connected,
healthy or in an alarm condition and the panel responds accordingly. In the case of the analogue
devices, the sensor condition information is obtained. Using various proven algorithms this data
is analysed. The analysis results in one of the following status levels being assigned to the device.
2.2.1 Device Faults
The DEVICE FAULT and SYSTEM FAULT LEDs are illuminated and the internal buzzer
sounds if:
1.
A device is removed.
2.
Faulty device.
3.
Loop fault.
The internal buzzer can be silenced by operating the SILENCE ALARMS push-button. The
device fault is also displayed on the LCD/VFD. If more than one device is in fault, the display
indicates the total number of faults. The operator can scroll the display using the SCROLL
ALARMS push-button to view each device in a fault condition.
2.2.2 Pre-Alarm
The PRE-ALARM LED is illuminated and the internal buzzer sounds if;
1.
Due to contamination, the device analogue value level increases more than would
normally be expected.
2.
The device analogue value level and rate is less than a normal fire condition would create.
As with Device Faults, the internal buzzer can be silenced by operating the SILENCE ALARMS
push-button.
2.2.3 Fire Alarm
The analogue value returned to the panel from a device is averaged over three scans and if this
value exceeds a specified threshold, a fire condition is activated. For device information refer
to the applicable Device Manual. The precise condition, under which each input device will
generate a fire state, is detailed in the Device Manual. The three FIRE LEDs, plus the respective
zone LED, are set to a flashing state.