Redundancy Module Requirements

A pair of redundancy modules is required to link the redundancy chassis pair. Place one redundancy module in the same slot of each redundant chassis. The partner redundancy modules monitor events in each chassis and initiate system responses as required.
IMPORTANT:
Use only direct, end-to-end connections between the fiber ports of partner redundancy modules. For example, do not use the fiber ports on a redundancy module to connect to a
Stratix®
 switch or other device.
ControlLogix®
 5590 controllers support only 1756-RM3 and 1756-RM3XT catalog numbers. The 1756-RM3-2SFP module is functionality equivalent to a 1756-RM3 module but comes with two small form-factor pluggable (SFP) fiber-optic transceivers.
For redundancy module and accessory specifications, see the ControlLogix and GuardLogix Controllers Technical Data, publication 1756-TD001.

EtherNet/IP Features

1756-RM3 and 1756-RM3XT redundancy modules support the following EtherNet/IP™ features:
  • 1000 Mbps, max communication rate
  • Protected Mode
  • Fiber security
  • CIP Sync™
For information about these EtherNet/IP features, see Configure Redundancy Modules.
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