254 Rockwell Automation Publication 1756-UM535D-EN-P - November 2012
Appendix C Upgrade from a Standard Redundancy System or to Another Enhanced Redundancy System
Step 6: Prepare the Redundant Chassis for the Firmware Upgrade
Complete these steps to prepare both the primary and secondary redundant
chassis for redundancy firmware upgrades.
1. Set the mode switch of the primary and secondary controllers to REM.
If the redundant controllers in both chassis of the redundant chassis pair
are not in Remote Program (REM) mode, the redundancy firmware
upgrade cannot be completed.
2. Open RSLinx Classic software and browse to the redundancy module.
3. Right-click the redundancy module and select Module Configuration to
open the RMCT.
4. Click the Configuration tab in the RMCT.
5. From the Auto-Synchronization pull-down menu, choose Never.
6. Click Apply, then click Yes.
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