Rockwell Automation 1747-DSN DISTRIBUTED I/O SCANNER - Manual (Page 36)

Chapter 4
Operation and Troubleshooting
4–6
The scanner has two LEDs that indicate its operating status, FAULT and
COMM. The FAULT LED indicates the scanner’s overall status. The
COMM LED indicates the DIO Link communications status.
The FAULT LED is off whenever the scanner is operating properly. The
COMM LED state is valid only when the FAULT LED is off.
The table below provides the scanner and communications status as indicated
by the FAULT and COMM LEDs.
FAULT LED COMM LED Status Information
Flashing Red Don’t care Scanner configuration error
No network communication attempted
Duplicate scanner detected on network
Solid Red Don’t care Major fault on scanner
No network communication attempted
Off Solid Red Hardware fault detected
Off Off Scanner is operating properly
Scanner is offline (no network communication
attempted)
Off Solid Green Scanner is operating properly
Scanner is online (active communication
established with all I/O blocks)
Off Flashing Green Scanner is operating properly
At least one configured I/O block is not
communicating
Off Flashing Red Scanner is operating properly
None of the configured I/O blocks are
communicating
Status LEDs