Diagnostics and Troubleshooting - User Interface
Revision 5 HC900 Hybrid Controller Installation and User Guide 137
9/03
Table 30 - Scanner Diagnostics
Diagnostic
Condition
Number
of
Strobes
Possible Cause Scanner Action User Action
Watchdog Reset 3 Watchdog reset resulting from
software failure
Scanner restarts and
requests configuration
from the main CPU.
1. Cycle power to the scanner
2. Upgrade scanner software
3. Replace scanner module
4. Contact Honeywell Personnel.
Prefetch abort
CPU exception
3 CPU failed when attempting to
fetch an instruction from the
prefetch register.
See watchdog reset 1. Cycle power to the scanner
2. Isolate system from noise and
cycle power to the scanner
3. Replace scanner module
Address error
CPU exception
3 The reserved exception
occurred for an unknown
reason.
See watchdog reset See Prefetch abort CPU
exception
Undefine
instruction CPU
exception
3 Bad Instruction Detected See watchdog reset See Prefetch abort CPU
exception
Data abort CPU
exception
3 CPU failed when attempting to
access data.
See watchdog reset See Prefetch abort CPU
exception
Software interrupt
exception
3 Spurious Interrupt See watchdog reset See Prefetch abort CPU
exception
Vector error 3 Interrupt vectors in RAM were
corrupted
Interrupt vectors were
restored
See Watchdog reset
Flash write error 4 Flash failed to burn properly. The boot code is the
only software running.
This software waits
for a request to burn
the flash. It does no
scanning of modules.
Modules remain in
their failsafe state.
Do a code download.
Rack backplane
failure
6 The Scanner is unable to
successfully communicate to
any modules that are in its SPI
backplane.
Does no scanning of
modules. Modules
remain in their failsafe
state.
1. Remove modules and check
for bent pins on connectors.
2. Reinsert modules one at a time
and note which module the
diagnostic reoccurs, and
replace that module.
3. Cycle power to the rack.
4. Replace the power supply.
5. Replace the rack.
6. Replace the scanner module.
