Rockwell Automation 1769-SM2 Compact I/O DSI/Modbus Communication Module - Manual (Page 154)

9-2 Troubleshooting
The MODULE status indicator is a bicolor red and green LED.
MODULE Status Indicator
Status Cause Corrective Action
Off The module is not powered. Apply power to the module.
Flashing
Red The module’s configuration data
is not valid.
•
Change the controller configuration
data to valid settings.
•
Reset the module parameters to
their default settings, and then reset
the module.
Steady Red The module is unable to
establish communication with the
controller. Cycle power to the controller.
Flashing
Green The module is establishing
communications with the
controller. Normal behavior -- no action required.
Steady
Green The module has established
communications with the
controller. Normal behavior -- no action required.
Flashing
Red/Green The module is in boot mode. Flash download the application code to
the module.