
Troubleshooting
Remote I/O
5-22
troubleshooting – remote I/O system, 1771-ASB series B continued...
See page 5-24 for footnotes
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Indicator
Response
Description
Probable Cause
Recommended Action
Active
Adapter Fault
I/O Rack Fault
Blinking
Off
Off
remote adapter not
actively controlling I/O
(scanner to adapter
communication link is
normal)
4
processor is in program or test
mode
scanner is holding adapter module
in fault mode
None
Fault should be cleared by
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 reset button to clear lockout
feature or cycle power; if after repeated
attempts indicators are still blinking,
check:
• push-button not wired properly to
field wiring arm
• wiring arm not connected to
adapter module
• adapter module was reset by
processor/ scanner, then
immediately faulted
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT