Rockwell Automation 1756-DH485 ControlLogix Data Highway 485 Module Installation Instructions - Manual (Page 17)

ControlLogix DH-485 Communications Module 17
Publication 1756-IN587A-EN-P - September 2005
Interpret the LED Status Indicators
The LED status indicators on the module provide information about your
module and the status of each channel. The following tables outline the
indicator condition and the corresponding status, and explain what each
condition means.
OK Normal operation for that
channel. None.
LINK
OFF
??? None
Interpret the LED Status Indicators
Module OK Indicator Module Status Recommended Action
Off Not operating. Apply chassis power.
Verify module is completely inserted into
chassis and backplane.
Green flashing Operating but not
routing messages. None, if no messages are actively being
routed through the module.
To route messages, configure module with
RSLinx software.
Solid Red, then Off Performing
self-test. None, normal operation.
Solid Green Operating and
routing messages. Verify module configuration.
Solid Red In major fault Reboot module. If red reoccurs, then
replace module.
Red flashing In major fault or
configuration
fault. Check alphanumeric indicator and take
action described in the Alphanumeric
Display Descriptions table.
Alphanumeric Display Descriptions
Code Description Recommended Action