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Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
84 UMC800 Controller Installation and User Guide Release F
4/01
Controller
Diagnostic Summary
(In the User Utility and Operator
Interface)
Controller
LED on CPU
Fault Detection / Troubleclearing
Menu
Item
Status Possible Cause Controller Action User Action
CPU
SPURIOUS
INTERRUPT
POWER
LED flashes
4 times.
Spurious Interrupt. Executes normally.
1. Force a cold
start. (Toggle
controller mode
switch from
PGM to RUN.)
2. Isolate system
from noise and
force a cold
start.
3. Replace CPU
board.
MEMORY GOOD
−− −
none
MEMORY LOW BATTERY Lo BATT
LED on.
Battery voltage is
low.
Executes normally.
Replace battery.
MEMORY FLASH ERROR
POWER
LED flashes
5 times.
Flash PROM failed
to burn.
Executes normally.
1. Force a cold
start. (Toggle
controller mode
switch from
PGM to RUN.)
2. If fault
reappears,
replace CPU
board.
GOOD
−− −
none
RTC
(Real
Time
Clock)
NOT
PROGRAMMED
POWER
LED flashes
6 times.
RTC not
programmed
Time and date is
set to 00:00:00,
January 1, 1970.
Enter correct time
and date.
RTC
BAD DATA
POWER
LED flashes
7 times.
Bad time and date.
Time and date is to
00:00:00, January
1, 1970.
1. Program RTC.
2. Cycle power.
3. Replace CPU.
4. Replace
boards in
backplane.
5. Replace
backplane.