Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 57
Install the Enhanced Redundancy System Chapter 3
Install the Redundancy Module
You must install one redundancy module in each chassis planned for your system.
Available modules are as follows:
• 1756-RM2/A
• 1756-RM2XT
• 1756-RM/A
• 1756-RM/B
• 1756-RMXT
Installation Requirements
Before you install the module, be sure to note the following:
• Understand redundant systems and redundant media
• Verify that the planned modules for each redundant chassis of the pair are
identical - including firmware revisions
• Verify that your enhanced redundancy firmware revision is compatible
with your planned redundant chassis modules
• The 1756-RM/B module offers a higher level of performance than a 1756-
RM/A module. Both modules can coexist in a redundant system, but the
highest system performance is achieved when the 1756-RM/B modules
are used together when used in conjunction with a 1756-L7x controller.
• The 1756-RM2/A module, when used in conjunction with a 1756-L7x
controller, offers higher crossload speeds than the 1756-RM/B module.
Do not connect the primary redundancy module to the secondary redundancy
module until all other components used in the redundant chassis pair are
installed.
Keep the redundancy module as close as possible to the controller module.
1756-RM2/A or 1756-RM2XT modules can only be used with other
1756-RM2/A or 1756-RM2XT modules. You cannot mix 1756-RM2/A and
1756-RM2XT modules with 1756-RM/A, 1756-RM/B, or 1756-RMXT modules.
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