Rockwell Automation 1756-RMxx ControlLogix Enhanced Redundancy System User Manual - Manual (Page 224)

224 Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
Chapter 9 Troubleshoot a Redundant System
You can also browse to the redundancy module in RSLinx Classic software to
determine if it is connected to the network. A red X over the redundancy module
indicates the module is not in the chassis.
Figure 66 - Missing Redundancy Module in RSLinx Classic Software
To correct the missing module anomaly, first verify that the redundancy module
is correctly installed in the chassis and it is properly powered. Then check the
intermodule cable that connects the redundancy modules.
After you have verified that the module is installed and powered, you may need to
synchronize the chassis by using the synchronization commands in the
Synchronization tab. Use the synchronization commands if your Auto-
Synchronization parameter for the chassis is not set to Always.
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