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16 Internal controls
16.1 Watchdog reset
If the microprocessor on the ECU fails to carry out its operation correctly it will attempt to restart. The
ECU will show the general Fault and System Fault LEDs on the front panel, the CPU fault inside the
panel will illuminate and the buzzer will sound. This fault can only be cleared by pressing the
WATCHDOG RESET button located inside the control panel. The control panel buzzer will continue to
sound until the watchdog activation is
reset.
16.2 Processor reset
If the microprocessor on the ECU fails to run correctly it can be reset by pressing the PROCESSOR
RESET button inside the control panel.
16.3 Terminate Extinguishing
Once the extinguishing outputs have been operated they can not be switched off until after the reset
inhibit timer has elapsed. For test purposes a terminate Extinguishing button is provided which will
terminate operation of the extinguishing outputs and allow the system to be reset.
16.4 Write enable switch
It is necessary to protect the configuration memory of the ECU while the system is running normally. To
do this a memory WRITE ENABLE switch is provided on each module. This switch must be in the on
position before any changes can be made to the configuration. The switch can be fragile and should be
operated with care.
Internal controls on ECU
Address
Term.
Exting.
Proc.
Reset
W/dog Reset
Write Enable
.
TM206
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Issue 1.0
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