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Diagnostics and Troubleshooting
Fault Detection and Troubleclearing
Release F UMC800 Controller Installation and User Guide 83
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
ADDRESS
ERROR
POWER
LED flashes
4 times.
Address Error
Detected.
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.
CPU
INSTRUCTION
ERROR
POWER
LED flashes
4 times.
Bad Instruction
Detected.
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.
CPU VECTOR
ERROR
POWER
LED flashes
4 times.
Bad Vector
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.