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Diagnostics Controller Diagnostics
38 900 Control Station User Guide Revision 9
May 2014
Item Status Possible Cause Controller Action What to do
CPU Status GOOD N/A N/A N/A
WATCHDOG
ERROR
Watchdog reset
resulting from
software failure
1. Associated rack monitor
block’s RACK OK pin is
turned off.
2. SYSTEM MONITOR
block’s HW OK pin is
turned off.
1. Force a cold start.
2. Upgrade controller module software.
3. Replace CPU board.
4. Contact Honeywell Personnel.
PREFETCH
ERROR
CPU failed when
attempting to fetch an
instruction from the
prefetch register.
1. Controller performs a
restart
2. Associated rack monitor
block’s RACK OK pin is
turned off.
3. SYSTEM MONITOR
block’s HW OK pin is
turned off.
1. Force a cold start.
2. Isolate system from noise and force
a cold start.
3. Replace CPU board.
ADDRESS ERROR
The reserved
exception occurred for
an unknown reason.
See PREFETCH ERROR.
See PREFETCH ERROR.
UNDEFINED
INSTR ERROR
Bad Instruction
Detected
See PREFETCH ERROR See PREFETCH ERROR.
DATA ABORT
ERROR
CPU failed when
attempting to access
data.
See PREFETCH ERROR.
See PREFETCH ERROR.
S/W INTERRUPT
ERR
Software Interrupt
occurred which is not
supported by the
software.
See PREFETCH ERROR.
See PREFETCH ERROR.
VECTOR ERROR
Corrupted interrupt
vectors in RAM.
Interrupt vectors were
restored.
See WATCHDOG ERROR.
Memory
Status
GOOD N/A N/A N/A
5 DAY BATTERY
WARNING
Estimated battery life
is less than 5 days.
1. Associated rack monitor
block’s RACK OK pin is
turned off.
2. SYSTEM MONITOR
block’s HW OK pin is
turned off.
Replace battery.
LOW BATTERY Battery voltage is low.
1. Associated rack monitor
block’s RACK OK pin is
turned off.
2. SYSTEM MONITOR
block’s LOW BATTERY
pin is turned on.
3. SYSTEM MONITOR
block’s HW OK pin is
turned off.
Replace battery.
FLASH ERROR Flash failed to burn
1. Associated rack monitor
block’s RACK OK pin is
turned off.
2. SYSTEM MONITOR
block’s HW OK pin is
turned off.
1. Force a cold start.
2. Replace CPU board.
I/O Status GOOD N/A N/A N/A
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