New Allen Bradley 1756-RM2 Enhanced Redundancy Module

The Allen-Bradley 1756-RM2 is an Enhanced Redundancy Module for the ControlLogix platform, designed to support fully redundant controller architectures without additional programming.

  • رقم الصنف :

    1756-RM2
  • الطلب (الحد الأدنى للكمية) :

    1 Piece
  • قسط :

    EXW
  • منشأ المنتج :

    USA
  • ميناء الشحن :

    Wuhan
  • مهلة :

    3~5 days
  • وزن :

    5kg
  • Product Details

     
     
    Specification Description
    Manufacturer Rockwell Automation (Allen-Bradley)
    Model 1756-RM2
    Product Family ControlLogix Redundancy
    Product Type Enhanced Redundancy Module
    Function Redundant controller synchronization and switchover
    Transmission Speed 1 Gbps fiber optic
    Number of Channels 2 (fiber optic in/out)
    Display 4-character alphanumeric display
    Current Draw (5.1V DC) 1.16 A
    Current Draw (24V DC) 3.4 mA
    Power Dissipation 6 W max
    Thermal Dissipation 21 BTU/hr
    Module Location Any slot in chassis
    Slot Width 1 slot
    Enclosure Type Open style
    Operating Temperature 0°C to +60°C
    Certifications CCC, CE, CSA, CUL, KC, Marine, NRTL, RCM, UL
    Weight Approx. 0.28 kg (0.63 lbs)

    Related Product Model Recommendations

     
     
    Model Description Typical Application
    1756-RM2 (this model) Enhanced Redundancy Module, 1 Gbps fiber optic Standard ControlLogix redundancy applications
    1756-RM2XT Extreme environment version Harsh industrial environments
    1756-RM Legacy redundancy module (not compatible with 1756-RM2) Legacy ControlLogix systems
    1756-RMC1 Redundancy module cable (1 meter) Short-distance redundant chassis connections
    1756-RMC3 Redundancy module cable (3 meters) Standard redundant chassis connections
    1756-RMC10 Redundancy module cable (10 meters) Long-distance redundant chassis connections
    1756-L71 / L72 / L73 ControlLogix 5570 series controllers Companion processors for redundant pairs
    1756-EN2T / EN2TR EtherNet/IP communication modules Redundant network communication

    Payment & Delivery

    FAQs

    Q1: What is the primary function of the 1756-RM2?

    The 1756-RM2 is an Enhanced Redundancy Module that supports fully redundant controller architectures. It automatically cross-loads programs from the primary to the secondary controller, maintains synchronization through continuous data exchange, and ensures automatic switchover if the primary controller fails.

    Q2: How many 1756-RM2 modules are required for a redundant system?

    Two modules are required per system — one in the primary chassis and one in the secondary chassis. The modules communicate via fiber optic cables (1756-RMC1, RMC3, or RMC10).

    Q3: Can the 1756-RM2 be used with the legacy 1756-RM module?

    No. The 1756-RM2 does not communicate with the 1756-RM. When upgrading an existing system, both the primary and secondary chassis must use 1756-RM2 modules. The 1756-RM2 is also not compatible with 1756-RM/A, 1756-RM/B, or 1756-RMXT modules.

    Q4: What controllers are compatible with the 1756-RM2?

    The 1756-RM2 is compatible with 1756-L6x and 1756-L7x series controllers (including L71, L72, L73, L74, L75). Enhanced redundancy systems require firmware version 19.053 or higher for L7x controllers, or 16.057/16.081/19.052 or higher for L6x controllers.

    Q5: What are common causes of "Redundancy Disqualified" errors with the 1756-RM2?

    Common causes include:

    • Firmware version mismatch between primary and secondary controllers or communication modules

    • Network issues — the EN2T/EN2TR modules in both chassis must be on the same subnet and able to communicate (event log message: "Partner not on same link")

    • Loose module connections — check processor and communication module seating in the backplane

    • Incorrect firmware — ensure redundant firmware is properly flashed to the 1756-RM2 modules

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