Status Leds - Allen-Bradley 1747-SN Installation Instructions Manual

6 Remote I/O Scanner

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
Flashing Not
Red applicable
Not
Red
applicable
Off Red
Off Off
Off Green
Flashing
Off
Green
Flashing
Off
Red
Publication 1747-5.33
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.
Status Information