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Industrial Technical Report – 1756-RMC3 ControlLogix Redundancy Fiber Optic Cable (3 Meter)
Product Overview
The 1756-RMC3 is a ControlLogix redundancy fiber optic communication cable designed for connecting redundancy modules in dual-controller PLC systems. It is part of the RMC cable family used to link RM, RM2, and RM2XT redundancy modules in high-availability automation architectures.
This model provides a medium-length fiber connection (3 meters), commonly used when redundancy racks are installed in adjacent or moderately separated control cabinets. It ensures stable, high-speed, interference-free synchronization between redundant controllers.
As a passive optical component, it does not require configuration, programming, or external power.
Brand Information
The product belongs to a globally recognized industrial automation ecosystem specializing in PLC systems, industrial communication technologies, motion control, and redundant system architectures.
It is widely used in:
- Industrial automation systems
- Process control environments
- High-availability PLC architectures
- Energy and utility systems
- Oil and gas automation networks
Key characteristics include:
- Fiber-optic interference immunity
- High-speed redundancy communication
- Industrial-grade durability
- Plug-and-play installation
- Stable long-term performance
Product Series
ControlLogix Redundancy Communication System
The 1756-RMC3 belongs to the ControlLogix redundancy interconnect cable family used for controller synchronization.
Key system features include:
- Duplex fiber-optic communication
- Real-time redundancy synchronization
- EMI-free transmission path
- Modular redundancy compatibility
- Flexible cabinet installation layout
Supported modules include:
- 1756-RM
- 1756-RM2
- 1756-RM2XT
- Redundant ControlLogix controller systems
The cable ensures continuous synchronization between primary and secondary controllers.
Technical Parameters
Detailed Specification Table
| Parameter | Specification |
|---|---|
| Model | 1756-RMC3 |
| Product Type | Redundancy Fiber Optic Cable |
| Series | ControlLogix Redundancy System |
| Function | Controller synchronization link |
| Cable Length | 3 meters (9.84 ft) |
| Cable Type | Duplex fiber optic cable |
| Connector Type | LC-to-LC connectors |
| Supported Modules | 1756-RM / RM2 / RM2XT |
| Transmission Method | Optical signal |
| Data Rate | Up to 1 Gbps (system dependent) |
| Channel Count | 1 duplex channel |
| Wavelength | 1300 nm typical |
| Attenuation | Low-loss industrial grade |
| Bend Radius | ≥ 30 mm |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| EMI Resistance | Fully immune (fiber-based) |
| Installation Type | Plug-in redundancy connection |
| Maintenance | Maintenance-free passive component |
| Jacket Material | Industrial-grade polymer |
| Fire Rating | Industrial standard compliant |
| Dimensions | 300 × 0.5 × 0.5 cm |
| Weight kg（ ） | ~0.06 kg |
Product Description
The 1756-RMC3 is a medium-length fiber optic redundancy cable designed for ControlLogix redundancy systems. It connects redundancy modules installed in separate chassis and enables real-time synchronization of controller states.
It is widely used in configurations where racks are not installed side-by-side but still require reliable high-speed communication. Fiber optic transmission ensures immunity to electromagnetic noise, making it suitable for heavy industrial environments.
The cable plays a critical role in maintaining system continuity in redundant PLC architectures.
Product Applications
Redundant PLC Systems
Used in:
- Dual-controller synchronization systems
- High-availability automation architectures
- Fault-tolerant industrial systems
- Continuous manufacturing processes
Industrial Automation Systems
Applied in:
- Assembly lines
- Packaging systems
- Material handling systems
- Robotics integration systems
Energy Sector
Used in:
- Power plants
- Substation automation
- Renewable energy monitoring
- Electrical grid systems
Oil & Gas Industry
Used in:
- Offshore platforms
- Pipeline monitoring systems
- Refinery control systems
- SCADA networks
Transportation Systems
Used in:
- Railway signaling systems
- Metro automation
- Airport infrastructure systems
- Traffic control systems
Product Advantages
1. Stable Medium-Distance Communication
Ideal for moderate cabinet separation layouts.
2. EMI-Free Fiber Transmission
Eliminates electrical noise interference completely.
3. Reliable Redundancy Link
Ensures continuous synchronization between controllers.
4. Plug-and-Play Installation
No configuration or setup required.
5. Industrial Durability
Designed for harsh industrial environments.
6. Maintenance-Free Operation
Passive optical design with no electronic failure points.
Recommended Models (Same Series or Related)
ControlLogix Redundancy Communication Components
| Model | Type | Function | Key Feature | Dimensions | Weight kg（ ） |
|---|---|---|---|---|---|
| 1756-RMC3 | Fiber Cable | Redundancy link | 3m medium connection | 300×0.5×0.5 cm | 0.06 kg |
| 1756-RMC1 | Fiber Cable | Redundancy link | 1m short connection | 100×0.5×0.5 cm | 0.05 kg |
| 1756-RMC10 | Fiber Cable | Redundancy link | 10m long connection | 1000×0.5×0.5 cm | 0.09 kg |
| 1756-RM2 | Redundancy Module | Controller sync | Hot standby system | 14×13×4 cm | 0.60 kg |
| 1756-RM2XT | XT Redundancy Module | Harsh environment sync | Extreme temperature design | 13.5×11×14 cm | 0.45 kg |
| 1756-RM | Redundancy Module | Legacy system sync | Standard redundancy module | 13.5×11×14 cm | 0.75 kg |
Recommended Popular Models (Same Platform Ecosystem)
Widely Used ControlLogix Modules
| Model | Function | Network | Role | Dimensions | Weight kg（ ） |
|---|---|---|---|---|---|
| 1756-L85E | PLC Controller | EtherNet/IP | Main processor unit | 15×14×13 cm | 0.65 kg |
| 1756-EN2TR | Ethernet Module | EtherNet/IP | Network communication | 13×14×12 cm | 0.48 kg |
| 1769-L36ERM | Compact PLC | Ethernet | Mid-level controller | 15×11×10 cm | 0.75 kg |
| 1734-AENTR | I/O Adapter | EtherNet/IP | Remote I/O gateway | 7×7×7 cm | 0.20 kg |
| 5069-L320ER | Advanced PLC | EtherNet/IP | High-performance control system | 13×10×9 cm | 0.54 kg |
Installation Notes
Proper installation ensures stable redundancy communication performance.
Key requirements:
- Maintain minimum bend radius (≥30 mm)
- Protect LC connectors from dust and contamination
- Avoid mechanical stress on fiber cable
- Separate from high-voltage wiring routes
- Verify correct module pairing before operation
Maintenance Characteristics
- No electrical maintenance required
- Passive fiber-optic structure
- High environmental resistance
- Long operational life
- Simple replacement procedure
Final Summary
The 1756-RMC3 is a 3-meter fiber optic redundancy cable designed for ControlLogix systems, enabling stable and high-speed communication between redundant controllers.
Its main value lies in providing reliable medium-distance synchronization with complete immunity to electromagnetic interference, making it suitable for industrial environments requiring continuous and fault-tolerant operation.