User manual

Troubleshooting
Extended Local I/O 5-25
Troubleshooting
Extended Local I/O 5-25
☞
Troubleshooting – Extended Local I/O System, 1771-ALX
See page 5-27 for footnotes
Indicator Response Description Probable Cause Recommended Action
Active
Adapter Fault
I/O Rack Fault
On
Off
Off
normal indication;
adapter is fully
operational
Active
Adapter Fault
I/O Rack Fault
Off
On
Off
local adapter fault
2
Local adapter not
operating; it will stay in
fault mode until fault is
corrected
Cycle power to the chassis to clear
the adapter fault.
3
Replace adapter if fault does not
clear.
Active
Adapter Fault
I/O Rack Fault
Blinking
Off
On
I/O chassis fault
2
Problem exists between:
• adapter and module
in chassis; the
module will stay in
fault mode until fault
is corrected
• shorted printed
circuit board runs on
backplane or I/O
module
Cycle power to the chassis to clear a
problem resulting from high noise.
3
• Remove and replace all I/O
modules one at a time
• Replace adapter
• If the problem does not clear,
check chassis or I/O module
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT