Allen-Bradley 1756-RM2/A ControlLogix Redundancy Enhanced Module – ControlLogix Redundancy System
Imagine a continuous process plant — a petrochemical reactor, a water treatment facility, or a power generation unit — where the primary PLC controller fails without warning. Without a redundancy module, the entire production line halts, safety interlocks may be compromised, and the cost of unplanned downtime can reach tens of thousands of dollars per hour. The Allen-Bradley 1756-RM2/A ControlLogix Redundancy Enhanced Module exists precisely to prevent this scenario, providing seamless, automatic failover that keeps your critical systems running without a single missed scan cycle.
The 1756-RM2/A is the second-generation enhanced redundancy module within Rockwell Automation’s ControlLogix platform — the world’s most widely deployed high-performance PLC architecture. Designed for applications where availability is non-negotiable, this module synchronizes two ControlLogix chassis in real time, enabling bumpless switchover in the event of a controller, communication, or power fault. It is the backbone of redundant control architectures across oil & gas, utilities, pharmaceuticals, and heavy industry worldwide.
Technical Specifications
- Part Number: 1756-RM2/A
- Series: ControlLogix Redundancy System (Enhanced)
- Manufacturer: Allen-Bradley / Rockwell Automation
- Module Type: Redundancy Enhanced Module
- Chassis Compatibility: 1756 ControlLogix chassis
- Redundancy Type: Hot-standby, bumpless switchover
- Synchronization Link: Dedicated fiber-optic redundancy cable (1756-RMxx series)
- Firmware: Compatible with ControlLogix Enhanced Redundancy firmware bundles
- Backplane Current Draw: Refer to Rockwell Automation publication 1756-UM535 for exact values
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C (-40°F to 185°F)
- Relative Humidity: 5% to 95% non-condensing
- Certifications: UL, CE, cUL (verify current listings with Rockwell Automation)
- Weight: Approximately 400 g
Note: All specifications are based on published Rockwell Automation documentation. Konmask.com does not fabricate or alter manufacturer specifications.
Key Features & Benefits
- Bumpless Failover: Automatic switchover to the secondary chassis occurs within one controller scan, eliminating process disruption and protecting product quality.
- Enhanced Synchronization: The RM2/A generation provides improved data synchronization rates over the original RM module, supporting larger I/O configurations and faster scan times.
- Dedicated Redundancy Link: Uses a dedicated fiber-optic cable between primary and secondary chassis, keeping redundancy traffic completely isolated from the process network.
- Transparent to Field Devices: I/O modules, drives, and field instruments see no interruption during switchover — no re-initialization, no lost data.
- Integrated Diagnostics: Built-in status indicators and RSLogix 5000 / Studio 5000 diagnostic tools provide real-time health monitoring of both chassis.
- Scalable Architecture: Supports a wide range of ControlLogix controller models and chassis sizes, allowing the redundancy system to grow with your application.
- SIL-Capable Deployments: When combined with appropriate safety-rated components, supports architectures targeting IEC 61511 functional safety requirements.
Industry & Equipment Applications
- Oil & Gas: Pipeline SCADA, compressor control, wellhead automation, LNG terminal management
- Power Generation & Utilities: Turbine control, substation automation, water/wastewater treatment
- Pharmaceuticals & Life Sciences: Batch process control, clean-room HVAC, validated manufacturing lines
- Petrochemicals & Refining: Distillation column control, reactor management, flare system control
- Mining & Metals: Conveyor systems, smelter control, ore processing automation
- Food & Beverage: Continuous production lines requiring 24/7 uptime and hygienic process integrity
System Integration & Compatible Parts
The 1756-RM2/A is designed to work within a complete ControlLogix redundancy system. Typical companion components include:
- 1756-RMxx Redundancy Cable: Fiber-optic link between primary and secondary RM2/A modules
- 1756-L7x / 1756-L8x Controllers: ControlLogix controllers compatible with Enhanced Redundancy firmware
- 1756-EN2T / 1756-EN2TR: EtherNet/IP communication modules for redundant network topologies
- 1756-PA75 / 1756-PB75: Power supply modules for ControlLogix chassis
- 1756-A10 / 1756-A13 / 1756-A17: ControlLogix chassis in various slot configurations
Contact Konmask.com to verify firmware bundle compatibility and to source complete redundancy system configurations.
Our Quality Assurance Process
- Authenticity Verification: Every Allen-Bradley module sourced by Konmask.com undergoes visual inspection and label verification against Rockwell Automation’s published part identification standards.
- Functional Testing: Where applicable, modules are powered and tested for basic communication and self-diagnostic pass prior to shipment.
- Secure Packaging: Anti-static packaging with moisture barrier and shock-absorbing foam to protect sensitive electronics during international transit.
- Documentation: Shipments include a packing list with part number, serial reference, and condition declaration. Certificates of conformance available upon request.
- Traceability: All inventory is logged with sourcing records to support your incoming inspection and audit requirements.
How to Order
- Submit an inquiry via the Contact / Request a Quote form on this page or email [email protected].
- Provide your required quantity, delivery timeline, and any specific firmware or condition requirements (new, surplus-new, refurbished).
- Receive a formal quotation within 1 business day, including unit price, lead time, and shipping options.
- Confirm the order and receive a proforma invoice for payment processing.
- Your order is packed, documented, and dispatched with full tracking information.
For urgent requirements or large-volume orders, call us directly at +0086 19859288691.
Why Choose Konmask.com?
- Industrial Automation Specialists: We focus exclusively on PLC, DCS, and industrial control components — not a generalist distributor.
- Global Sourcing Network: Access to surplus-new and factory-new Allen-Bradley inventory from verified supply channels worldwide.
- Technical Pre-Sales Support: Our team includes engineers with hands-on ControlLogix experience who can advise on compatibility and system design.
- Fast International Shipping: DHL, FedEx, and UPS express options with full export documentation for customs clearance.
- Responsive Communication: Inquiries answered within 24 hours, with dedicated account management for repeat customers.
- Competitive Pricing: Direct sourcing relationships allow us to offer market-competitive pricing on hard-to-find and obsolete parts.
Frequently Asked Questions
Q: What is the difference between the 1756-RM and the 1756-RM2/A?
A: The 1756-RM2/A is the Enhanced Redundancy generation, offering improved synchronization performance, support for larger I/O counts, and compatibility with newer ControlLogix controller firmware bundles compared to the original 1756-RM module.
Q: Can the 1756-RM2/A be used with any ControlLogix controller?
A: No. The RM2/A requires specific Enhanced Redundancy firmware bundles and is compatible with designated ControlLogix L-series controllers. Always verify firmware compatibility using Rockwell Automation publication 1756-UM535 before ordering.
Q: Do you supply new or refurbished units?
A: Konmask.com can supply factory-new, surplus-new (unused, original packaging), and professionally refurbished units depending on availability. Condition is clearly stated in every quotation.
Q: How long does international shipping take?
A: Express courier (DHL/FedEx) typically delivers within 3–7 business days to most destinations. Economy options are available for non-urgent orders.
Q: Can you provide a certificate of conformance or test report?
A: Yes. Documentation packages including certificates of conformance and inspection records are available upon request at the time of order.
Q: What if the module is faulty upon arrival?
A: Konmask.com offers a return and replacement policy for DOA (dead on arrival) units. Please contact [email protected] within 7 days of receipt with photographic evidence.
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Contact: [email protected] | +0086 19859288691
