Process Control Redundancy Solution – Allen-Bradley 1756-RM2K | ControlLogix
Where This Product Is Used
The Allen-Bradley 1756-RM2K Redundancy Module is engineered for mission-critical industrial environments where unplanned downtime is unacceptable. Engineers and system integrators specify this module across a wide range of high-availability applications:
- Oil & Gas Processing Plants – Continuous process control for pipeline monitoring, compressor stations, and wellhead automation where a single controller failure can trigger costly shutdowns.
- Chemical & Petrochemical Facilities – Safety-instrumented systems (SIS) and distributed control requiring hot-standby redundancy to meet IEC 61511 process safety targets.
- Power Generation & Utilities – Turbine control, substation automation, and grid-tie systems demanding 24/7 availability with sub-100ms failover.
- Water & Wastewater Treatment – SCADA-integrated pump station and filtration control where regulatory compliance mandates continuous operation.
- Automotive & Discrete Manufacturing – High-throughput assembly lines where controller redundancy eliminates single points of failure in coordinated motion and I/O control.
- Pharmaceutical & Food Processing – GMP-regulated batch processes requiring validated, fault-tolerant control architectures.
Technical Specifications
- Part Number: 1756-RM2K
- Series: ControlLogix (1756)
- Module Type: Enhanced Redundancy Module (RM2)
- Redundancy Architecture: Hot-standby, bumpless switchover
- Failover Time: Typically <80 ms (application-dependent)
- Synchronization Ports: Dual fiber-optic ports for redundancy link
- Backplane Compatibility: 1756 ControlLogix chassis
- Firmware: Compatible with ControlLogix Enhanced Redundancy System (CERS)
- Power Supply: Supplied via ControlLogix backplane
- Operating Temperature: 0 °C to 60 °C (32 °F to 140 °F)
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% non-condensing
- Weight: Approx. 500 g
- Certifications: UL, CE, cUL
Why Engineers Specify This Model
- Enhanced RM2 Architecture: The 1756-RM2K supersedes the legacy 1756-RM with improved synchronization speed and broader firmware compatibility, making it the preferred choice for new ControlLogix redundancy deployments.
- Bumpless Failover: Crossloads controller memory continuously so the secondary chassis assumes control without process interruption — no output glitches, no setpoint loss.
- Dual Fiber Links: Two independent redundancy links eliminate the synchronization cable as a single point of failure, a critical requirement for SIL-rated applications.
- Studio 5000 Integration: Fully supported in Logix Designer with native redundancy configuration wizards, reducing engineering time and commissioning risk.
- Scalable I/O Support: Works with 1756 local and remote I/O, ControlNet, EtherNet/IP, and DeviceNet adapters — no proprietary I/O restrictions.
- Long Product Lifecycle: Rockwell Automation’s ControlLogix platform has a proven multi-decade support commitment, protecting capital investment.
Complete System Bill of Materials
A typical 1756-RM2K redundancy system requires the following components (primary + secondary chassis):
- 1756-RM2K × 2 — Redundancy Module (one per chassis)
- 1756-L8x or 1756-L7x — ControlLogix Controller (matched firmware revision)
- 1756-A10 / 1756-A13 / 1756-A17 — ControlLogix Chassis (matched slot count)
- 1756-PA75 / 1756-PB75 — Power Supply (one per chassis)
- 1756-RMCT7 — Redundancy Module Configuration Tool (optional, for diagnostics)
- 1786-RPA / 1786-RPFRL — Fiber Redundancy Cable (RM2 fiber link)
- 1756-EN2T / 1756-EN2TR — EtherNet/IP Communication Module
- 1756-IB16 / 1756-OB16 — Digital I/O Modules (application-specific)
Compliance & Industry Standards
- IEC 61131-3 – Programmable controller programming languages
- IEC 61511 / ISA-84 – Functional safety for process industry SIS
- NFPA 72 – Compatible with fire alarm control integration architectures
- UL 508 – Industrial control equipment listing
- CE Marking – EMC Directive 2014/30/EU and Low Voltage Directive 2014/35/EU
- RoHS Compliant – Restriction of Hazardous Substances
- ATEX / IECEx – Consult factory for hazardous location installation guidance
Quality Assurance & Sourcing
Konmask.com specializes in industrial automation components for B2B buyers who cannot afford counterfeit or substandard hardware. Every 1756-RM2K unit we supply is:
- Sourced from authorized distributors or verified surplus channels with full traceability
- Inspected for physical integrity, label authenticity, and firmware revision prior to dispatch
- Shipped with original packaging where available, or in ESD-safe anti-static packaging
- Backed by our 90-day functional warranty against defects in materials and workmanship
- Supported by pre-sales technical consultation to confirm compatibility with your existing ControlLogix revision
How to Source This Part
Ready to procure the 1756-RM2K for your project? Here’s how to work with us:
- Add to Cart – For standard in-stock units, proceed directly to checkout with secure payment.
- Request a Quote – For volume orders (>5 units), OEM pricing, or project-based procurement, contact our sales team for a formal quotation within 24 hours.
- Firmware Matching – Provide your existing controller firmware revision and we will confirm compatibility before shipment.
- Lead Time – In-stock units ship within 1–3 business days. Ex-stock or special-order units: 5–15 business days depending on origin.
- Export Compliance – We handle EAR/ECCN classification and export documentation for international shipments.
Application-Specific FAQ
Q: What is the difference between 1756-RM and 1756-RM2K?
A: The 1756-RM2K is the Enhanced Redundancy Module (RM2 series) with faster synchronization, dual fiber ports, and support for newer ControlLogix firmware revisions. The legacy 1756-RM is discontinued; 1756-RM2K is the current replacement.
Q: Can I mix 1756-RM2K with older 1756-L6x controllers?
A: No. The RM2K requires ControlLogix L7x or L8x controllers running compatible Enhanced Redundancy System (CERS) firmware. Mixing with L6x is not supported.
Q: How many redundancy modules do I need?
A: One 1756-RM2K per chassis — two total for a primary/secondary redundant pair. Both must be the same catalog number and firmware revision.
Q: Does the 1756-RM2K support partial I/O redundancy?
A: The RM2K provides controller-level redundancy. For I/O-level redundancy, pair it with 1756-EN2TR (DLR-capable) EtherNet/IP modules and redundant I/O adapters.
Q: What fiber cable type is required for the redundancy link?
A: The 1756-RM2K uses 1786-RPA (plastic fiber) or 1786-RPFRL (glass fiber) redundancy cables. Maximum cable length depends on fiber type — consult the 1756-RM2 User Manual (Publication 1756-UM535).
Q: Is the 1756-RM2K suitable for SIL 2 applications?
A: The ControlLogix platform with RM2K can be applied in SIL 2 architectures when combined with a certified safety controller (1756-L8xS GuardLogix) and a validated safety application. Consult Rockwell Automation Safety Application Note for details.
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