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

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