Rockwell Automation Publication 1756-UM535D-EN-P - November 2012 41
Design an Enhanced Redundancy System Chapter 2
Redundant ControlNet Media
The use of redundant ControlNet media helps to prevent a loss of
communication if a trunkline or tap is severed or disconnected. A system that
uses redundant ControlNet media uses these components:
• 1756-CN2R/B communication modules in each redundant chassis
• ControlNet modules designed for redundant media at each ControlNet
node on the network
• Redundant trunk cabling
• Redundant tap connections for each ControlNet module connected
Figure 8 - Redundant ControlNet Media with Redundant ControlLogix Chassis
Redundant ControlLogix Chassis with
1756-CN2R Modules
Redundant Trunk Lines
Workstation with ControlNet
Interface Card
1785-L80C15
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