Allen-Bradley 1756-RM2 Redundancy Enhanced Module – ControlLogix Redundancy System
Imagine a critical production line—an automotive stamping press, a petrochemical reactor, or a water treatment facility—suddenly losing its primary PLC controller mid-operation. Without a hot-standby redundancy solution, the result is an uncontrolled shutdown: lost batches, equipment damage, safety incidents, and thousands of dollars in downtime per minute. The Allen-Bradley 1756-RM2 ControlLogix Redundancy Enhanced Module exists precisely to eliminate this risk. It provides seamless, bumpless switchover between primary and secondary controller chassis, ensuring your process never misses a scan cycle—even during a hardware fault.
The 1756-RM2 is the second-generation Enhanced Redundancy Module within Rockwell Automation’s ControlLogix 1756 platform—the world’s most widely deployed large-frame PLC architecture. Compared to its predecessor (1756-RM), the RM2 delivers higher-speed fiber-optic synchronization, broader firmware compatibility, and support for the Enhanced Redundancy System (ERS) feature set introduced in ControlLogix firmware v19 and later. It is the de facto standard for SIL 2-capable redundant control in process industries globally, trusted by engineers across oil & gas, power generation, pharmaceuticals, and advanced manufacturing.
Technical Specifications
- Part Number / SKU: 1756-RM2
- Series: ControlLogix 1756
- Module Type: Redundancy Enhanced Module
- Redundancy System: Enhanced Redundancy System (ERS)
- Synchronization Interface: Fiber-optic (RM2 fiber cable required)
- Chassis Compatibility: 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Minimum Firmware: ControlLogix v19.052 or later (ERS)
- Switchover Type: Bumpless (zero-scan-cycle loss)
- Power Supply: Powered via ControlLogix chassis backplane
- Weight: Approx. 400 g
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Certifications: CE, UL, cUL, ATEX (zone 2 with appropriate housing)
- Country of Origin: USA
Key Features & Benefits
- Bumpless Switchover: Primary-to-secondary failover completes within one controller scan cycle, maintaining continuous process control without operator intervention.
- Enhanced Redundancy System (ERS): Supports Rockwell’s ERS architecture, enabling redundancy across controllers, I/O, and network paths for a fully fault-tolerant system.
- High-Speed Fiber Synchronization: Dedicated fiber-optic link between primary and secondary chassis ensures real-time data mirroring at full controller speed.
- Broad Firmware Support: Compatible with ControlLogix firmware v19.052 and above, including the latest v33+ releases, protecting your investment across system upgrades.
- Automatic Qualification: Secondary chassis automatically qualifies and synchronizes after a switchover event without manual re-programming.
- Diagnostic Transparency: Integrated status LEDs and RSLogix 5000 / Studio 5000 diagnostic tags provide real-time redundancy health monitoring.
- SIL 2 Capable: When integrated into a certified safety architecture, supports IEC 61511 SIL 2 functional safety requirements.
Industry & Equipment Applications
- Oil & Gas: Pipeline SCADA, compressor control, wellhead automation, LNG terminal control
- Power Generation: Turbine control systems, substation automation, grid tie protection
- Petrochemicals & Refining: Distillation column control, reactor management, blending systems
- Pharmaceuticals: Batch process control (FDA 21 CFR Part 11 environments), clean-room HVAC
- Water & Wastewater: Pump station control, treatment plant automation, SCADA integration
- Automotive Manufacturing: Body shop welding lines, paint shop conveyors, press control
- Mining & Minerals: Conveyor systems, crusher control, flotation cell automation
System Integration & Compatible Parts
The 1756-RM2 is designed to work within a complete ControlLogix redundancy architecture. Key compatible components include:
- 1756-RM2XT – Extended-temperature variant for harsh environments
- 1756-RMXT – Standard Redundancy Module (predecessor, for legacy systems)
- 1756-L7x / 1756-L8x Series Controllers – Compatible ControlLogix CPUs
- 1756-EN2TR / 1756-EN3TR – EtherNet/IP communication modules for redundant network paths
- 1756-PA75R / 1756-PB75R – Redundancy-rated power supplies
- 1756-RMC1 / 1756-RMC3 – Redundancy Module Cables (fiber, 1 m / 3 m)
- Studio 5000 Logix Designer v21+ – Programming software with ERS project support
Our Quality Assurance Process
At Konmask.com, every Allen-Bradley 1756-RM2 unit we supply undergoes a rigorous multi-stage verification process before shipment:
- Source Verification: Units are sourced exclusively from authorized distributors, certified resellers, or directly from decommissioned OEM installations with full traceability documentation.
- Visual & Physical Inspection: Each module is inspected for label authenticity, connector integrity, housing condition, and firmware version label consistency.
- Functional Test (where applicable): Modules are bench-tested in a live ControlLogix chassis to verify backplane communication and redundancy status LED behavior.
- Anti-Counterfeit Check: Serial numbers are cross-referenced against known Rockwell Automation product databases and counterfeit indicators are screened.
- Secure Packaging: Units are shipped in ESD-safe packaging with desiccant, inside double-walled cartons, with full photographic documentation of condition at dispatch.
How to Order
- Submit an Inquiry: Contact us via email at [email protected] or WhatsApp/phone at +0086 19859288691 with your required quantity and delivery timeline.
- Receive a Quotation: Our technical sales team will respond within 4 business hours with pricing, lead time, and availability confirmation.
- Order Confirmation: Upon agreement, we issue a proforma invoice. Payment terms are discussed based on order value and customer history.
- Shipment & Tracking: Orders are dispatched via DHL, FedEx, or UPS Express with full tracking. Export documentation (commercial invoice, packing list, COO) is provided for customs clearance.
- After-Sales Support: Our engineering team is available post-delivery to assist with installation questions or warranty claims.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: We focus exclusively on PLC, DCS, HMI, and automation components—not a generalist electronics reseller.
- ✅ Global B2B Export Experience: We have shipped to 40+ countries with full export compliance documentation.
- ✅ Technical Pre-Sales Support: Our team includes qualified automation engineers who can advise on compatibility, firmware, and system architecture.
- ✅ Competitive Lead Times: Extensive supplier network allows us to source hard-to-find and obsolete parts faster than most distributors.
- ✅ Transparent Sourcing: We disclose the source and condition (new, surplus, refurbished) of every unit we sell.
- ✅ Secure Payment & Logistics: Multiple payment methods accepted; all shipments are insured and fully tracked.
Frequently Asked Questions
Q1: What is the difference between the 1756-RM and the 1756-RM2?
The 1756-RM2 is the Enhanced Redundancy Module that supports Rockwell’s Enhanced Redundancy System (ERS), introduced with ControlLogix firmware v19. It offers faster synchronization, broader firmware compatibility, and support for redundant I/O and network paths. The original 1756-RM supports only the Standard Redundancy System and is not compatible with ERS projects.
Q2: Can the 1756-RM2 be used with any ControlLogix controller?
The 1756-RM2 is compatible with ControlLogix L6x and L7x/L8x series controllers running firmware v19.052 or later. It is not compatible with CompactLogix or GuardLogix standalone controllers. Always verify your controller’s firmware version before ordering.
Q3: Do I need two 1756-RM2 modules for a redundant system?
Yes. A complete ControlLogix Enhanced Redundancy System requires one 1756-RM2 installed in the primary chassis and one in the secondary chassis, connected via a fiber-optic redundancy cable (1756-RMC1 or 1756-RMC3).
Q4: What fiber cable is required to connect the two 1756-RM2 modules?
Rockwell Automation offers the 1756-RMC1 (1-meter) and 1756-RMC3 (3-meter) fiber-optic redundancy cables specifically designed for the 1756-RM2. Standard fiber patch cables are not compatible.
Q5: Is the 1756-RM2 still in production by Rockwell Automation?
The 1756-RM2 has been superseded by newer redundancy solutions in the ControlLogix 5580 platform. However, it remains widely used in installed base systems and is available as a surplus/new-old-stock part. Konmask.com maintains stock and sourcing channels for this module to support ongoing maintenance needs.
Q6: What is the typical lead time for the 1756-RM2?
Lead time varies by current stock availability. In-stock units typically ship within 2–3 business days. For sourced units, lead time is typically 5–15 business days. Contact us for a real-time availability check.
Q7: Can Konmask.com provide a warranty on the 1756-RM2?
Yes. We offer a 90-day functional warranty on all modules we supply. Extended warranty options are available upon request. Warranty terms are detailed in our quotation documentation.
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Contact: [email protected] | +0086 19859288691
