Manual

Troubleshooting
Chapter 10
108
Figure 10.5
Troubleshooting
Flowchart
START
Processor
RUN
indicator
?
I/O
adapter ACTIVE
indicator
?
PC
communications
fault
indicator
Expander
communication
fault indicator
?
Processor
RUN
indicator
?
1771-M3
controller
ACTIVE indicator
on constant
1771-ES
expander
ACTIVE indicator
on?
1771-ES
Expander
Diagnostic indicator
on ?
?
?
Consult Assembly
and Installation
PC Manual
1. Data blocks overlap
processor or program
memory
2. Invalid block transfer
starting addresses
3. Replace 1771-M3
controller
References in reverse type are to the
notes in section titled "Monitoring the
Status Block".
Flashing
?
1. Switch settings.
2. Power down
reseat 1771ES
expander.
3. Replace 1771ES
expander.
1. 1771ES expander
switch settings.
2. Replace 1771M3
controller
3. Replace 1771ES
expander(s).
1. Power down.
reseat 1771ES expander.
2. Cycle power at I/O chassis
3. Replace 1771ES
expander.
1. Cycle power at I/O chassis
2. Replace 1771ES
expander.
3. Replace 1771M3 controller
1. Check I/O chassis
power supply.
2. Power down,
reseat 1771M3
controller
3. Replace 1771M3
controller.
Consult PC
installation
manual
OFF
ON
ON
OFF
OFF
YES
YES
NO
ON
OFF
ON
NONO
YES
YES
NO
A
11068 OS
1
2
3
2
2
2
1
1
1
4
2
2
2
2
2