Honeywell UMC800 User Manual

Page 91

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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.

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