User manual

Troubleshooting
Extended Local I/O 5-26
troubleshooting – extended local I/O system, 1771-ALX continued...
See page 5-27 for footnotes
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Indicator Response Description Probable Cause Recommended Action
Active
Adapter Fault
I/O Rack Fault
Blinking
Off
Off
outputs are reset • processor is in program or test
mode
• local I/O Scanner is holding
adapter module in fault mode
•none
• Fault should be cleared by
Local I/O scanner
Active
Adapter Fault
I/O Rack Fault
Blinking
alternately
Off
adapter module not actively
controlling I/O
2
adapter module in processor
restart lockout mode (adapter to
scanner link is normal)
processor restart lockout switch
on chassis backplane switch
assembly on
1
Depress chassis reset button to
clear lockout feature or cycle
power; if after repeated
attempts indicators are still
blinking, check that adapter
module was reset by
processor/scanner, then
immediately faulted
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT