Rockwell Automation Logix5000 Logix5000 Controllers Quick Start - Manual (Page 126)

126 Publication 1756-QS001E-EN-P - October 2009
Chapter 7 Troubleshoot the Controller
Troubleshoot I/O Communication
If there is a problem with several of the devices in your system, communication with an I/O module may
have failed.
The I/O indicator on the front of the controller and in the programming software indicates status.
The Controller Organizer also shows status.
If the indicator is Then
Off Either:
• There are no modules in the I/O configuration of the controller.
• The controller does not contain a project (controller memory is empty).
Solid green The controller is communicating with all the modules in its I/O configuration.
Flashing green One or more modules in the I/O configuration of the controller are not responding.