Matched chassis position
Install one Allen-Bradley 1756-RM2XT in the same supported slot of each partner chassis so the redundancy structure remains symmetrical.
Allen-BradleyI/OProduct record
CONTROLLOGIX-XT · REDUNDANCY LINK
Allen-Bradley 1756-RM2XT ControlLogix-XT Redundancy Module
01
Model Overview
Allen-Bradley 1756-RM2XT is a ControlLogix-XT redundancy module that links the primary and secondary controller chassis in a redundant system. One module occupies the same chassis slot in each partner chassis, and two fiber channels carry redundancy synchronization independently of the controller Ethernet network.
Preinstalled SFP transceivers on Allen-Bradley 1756-RM2XT provide CH1 and CH2 redundancy ports, while the backplane connector exchanges controller and chassis state with local modules. Both chassis use matching supported ControlLogix controllers, modules and redundancy configuration so a role change does not introduce a different I/O structure.
The XT construction of Allen-Bradley 1756-RM2XT extends operation to −25…+70 °C when installed in a supported 1756-A7XT or 1756-A10XT chassis with XT power. Module indicators show link and redundancy state, allowing a failed fiber path to be distinguished from a partner-chassis or synchronization condition.
02
Technical Specifications
| Brand | Allen-Bradley |
|---|---|
| Model | 1756-RM2XT |
| Product Name | ControlLogix-XT Redundancy Module |
| Country | United States |
| Redundancy Channels | 2 fiber channels, CH1 and CH2 |
| SFP Transceivers | Preinstalled |
| Supported Controllers | ControlLogix 5570 and 5580 families |
| Supported Chassis | 1756-A7XT and 1756-A10XT |
| Module Location | Same slot in both partner chassis |
| Slot Width | 1 |
| Current Draw | 1.16 A at 5.1 V DC; 3.4 mA at 24 V DC |
| Power Dissipation | 6 W maximum |
| Thermal Dissipation | 21 BTU/hr |
| Enclosure | Open style |
| Operating Temperature | −25 to +70 °C |
| Weight | Approx. 0.29 kg |
03
System Integration
Allen-Bradley 1756-RM2XT forms the dedicated synchronization path between two matching ControlLogix-XT controller chassis.
Dual fiber path
CH1 and CH2 connect the partner modules and provide two redundancy channels that remain separate from the control Ethernet network.
Backplane exchange
Each module receives controller and chassis state through its local backplane, then transfers the redundancy data across the fiber link.
04
Installation Highlights
Allen-Bradley 1756-RM2XT must be installed as a paired chassis component, with power removed and both fiber paths verified before redundancy is commissioned.
01
Prepare matching chassis
Confirm compatible XT chassis, power supplies, controllers, module inventory and identical slot assignments before mounting either redundancy module.
02
Install and connect fibers
De-energize both chassis, seat each module fully, connect CH1 to CH1 and CH2 to CH2, and protect the fiber bend radius and connector faces.
03
Verify the redundant pair
Restore power, check both channel indicators and partner status, then complete synchronization and a controlled role-change test before returning the system to service.
05
Common Questions
Why must Allen-Bradley 1756-RM2XT occupy the same slot in both chassis?
Allen-Bradley 1756-RM2XT depends on matched primary and secondary chassis structures; different slot assignments break the expected redundant configuration.
Can Allen-Bradley 1756-RM2XT be paired with a standard 1756-RM2?
Use the same supported redundancy-module catalog in both partner chassis; Allen-Bradley 1756-RM2XT is intended for the ControlLogix-XT chassis and temperature environment.
What does one failed fiber channel mean for Allen-Bradley 1756-RM2XT?
A single channel fault on Allen-Bradley 1756-RM2XT requires inspection of the indicated SFP, connector and fiber path even if the second redundancy channel remains active.
Which chassis support Allen-Bradley 1756-RM2XT?
Allen-Bradley 1756-RM2XT is listed for 1756-A7XT and 1756-A10XT chassis with the compatible XT power architecture.
How should Allen-Bradley 1756-RM2XT fiber connectors be handled?
Keep Allen-Bradley 1756-RM2XT SFP and cable ends capped until connection, clean them with approved fiber procedures and avoid tight bends or side load.
What should be tested after replacing Allen-Bradley 1756-RM2XT?
After replacing Allen-Bradley 1756-RM2XT, verify both links, partner recognition, module compatibility, full synchronization and the documented controlled switchover test.
06
Brand Supply Scope
Moore Automation
https://www.mvme.cnMoore Automation covers industrial control and monitoring references across Rockwell Automation, ABB, Siemens, Schneider Electric, Honeywell, Bently Nevada and other established brands. The scope includes controllers, communication hardware, I/O and related modules.
Control platformsPLC and DCS families
CommunicationNetwork and redundancy modules
07
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08
Sales Contact
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CompanyMoore Automation
ManagerLeonia
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