Specifications

ST900 Family General Handbook
667/HB/32900/000 Issue 11 Page 230 of 265
Condition CPU Fault Action
Lamp Supply Relay Failure
Stuck closed check. Stuck open will be
detected by the ‘low lamp supply test’ above.
Check cannot be disabled and failure always
results in controller shutdown. Note: Test to
be done at start-up and a
t a configurable time
each day.
Main
Only
Controller Shutdown
Firmware Checksum Fail
Check on power-up. Monitoring cannot be
disabled. Check performed by the all
processors in the system on their own
firmware.
Main
CPU
Controller Shutdown
Sig
Mon
Controller Shutdown
Other
CPUs
Processor restarted. This may
indirectly cause the controller to
shutdown, depending on
processor’s location in system.
Firmware Checksum Fail
Background check performed by all
processors in the system on their own
firmware. Monitoring cannot be disabled.
Main
CPU
Controller Shutdown
Sig
Mon
Controller Shutdown
Other
CPUs
Processor restarted. This may
indirectly cause the controller to
shutdown, depending on
processor’s location in system.
Configuration Data Checksum Fail (Power
up)
Check on power-up by Main Processor. All
other processors will check their own
configuration data is valid when they receive
it from the Main Processor on start-up.
Monitoring cannot be disabled.
Main
CPU
Controller Shutdown
Sig
Mon
Controller Shutdown
Other
CPUs
Processor restarted. This may
indirectly cause the controller to
shutdown, depending on
processor’s location in system.
Configuration Data Checksum Fail
(Background)
Background check. Monitoring cannot be
disabled.
Main
CPU
Controller Shutdown
Sig
Mon
Controller Shutdown
Other
CPUs
Processor restarted. This may
indirectly cause the controller to
shutdown, depending on
processor’s location in system.