Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 6)

6 Remote I/O Scanner
Publication 1747-IN060D-EN-P - November 2002
Status LEDs
The scanner has two LEDs, FAULT and COMM, which indicate its operating status.
•
FAULT LED - indicates the scanner’s overall status. The red FAULT LED is off
whenever the scanner is configured and operating properly.
•
COMM LED - allows you to monitor communication with all configured
devices. This LED is green once the scanner is in the Run mode. It is red if a
hardware fault is detected. The COMM LED status information is valid only
when the FAULT LED is off.
The table below explains the scanner and communication status as indicated by the
FAULT and COMM LEDs.
FAULT LED COMM LED Status Information
Flashing Red Not
applicable Scanner configuration error.
No RIO link communication attempted.
Duplicate scanner detected on RIO link.
Red Not
applicable Major fault on scanner.
No RIO link communication attempted.
Off Red Hardware fault detected.
Off Off Scanner is operating properly.
Scanner is offline (no RIO link communication attempted).
Off Green Scanner is operating properly.
Scanner is online (active communication established with all devices).
Off Flashing
Green Scanner is operating properly.
At least one configured RIO link device is not communicating.
Off Flashing Red Scanner is operating properly.
None of the configured RIO link devices are communicating.