User manual

Troubleshooting
Remote I/O 5-23
troubleshooting – remote I/O system, 1771-ASB series B continued...
See page 5-24 for footnotes.
☞
Indicator
(on I/O rack)
Response Description Probable Cause Recommended Action
Active
Adapter Fault
I/O Rack Fault
Off
Off
Off
If remote I/O
scanner/distribution panel
(1772-SD, -SD2) is in
disable search mode,
then response is normal.
2
• power supply fault
• wiring from scanner to
adapter module
disrupted
• scanner not configured
properly
• one faulted chassis
within a rack group
address causing
scanner/distribution
panel to fault all chassis
in rack group address
(when in disable search
mode)
• Check power supply, cable connections, and
make sure adapter module is fully seated in
chassis
• Correct cable and wiring defects
• Refer to publication 1772-2.18 for scanner
configuration
• Check sequentially from the first module to the
last module to pinpoint fault; correct any faults
and proceed to the next chassis
Active
Adapter Fault
I/O Rack Fault
Blinking
On
On
module identification line
fault
excessive noise on
backplane
Verify power supply and chassis grounding
ACTIVE
ADAPTER
FAULT
I/O RACK
FAULT