Allen-Bradley 1747-SN Installation Instructions Manual page 5

The table below explains the scanner and communication status as indicated by the
FAULT and COMM LEDs.
FAULT LED COMM LED
Flashing Red Not
applicable
Red Not
applicable
Off Red
Off Off
Off Green
Off Flashing
Green
Off Flashing Red
Status Information
Scanner configuration error.
No RIO link communication attempted.
Duplicate scanner detected on RIO link.
Major fault on scanner.
No RIO link communication attempted.
Hardware fault detected.
Scanner is operating properly.
Scanner is offline (no RIO link communication attempted).
Scanner is operating properly.
Scanner is online (active communication established with all devices).
Scanner is operating properly.
At least one configured RIO link device is not communicating.
Scanner is operating properly.
None of the configured RIO link devices are communicating.
Remote I/O Scanner
Publication 1747-IN060B-EN-P - June 2001
5