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- Allen Bradley
- 1786-RPFRXL
- ControlNet Ultra-Long Distance Fiber Optic Ring Repeater Module
- USA
- 108 x 69 x 107 mm
- 0.18 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
Price advantage
All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
The Allen-Bradley 1786-RPFRXL is a ControlNet fiber optic ring repeater module designed by Rockwell Automation for extending industrial communication networks over very long distances using fiber optic media.
It is used in ControlNet systems to regenerate, retime, and extend network signals while maintaining deterministic real-time communication. The “XL” version supports ultra-long distance transmission and fiber ring redundancy architectures.
This module is commonly used in large industrial plants where ControlNet nodes must be connected across wide physical areas or electrically noisy environments.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1786-RPFRXL |
| Product Type | ControlNet Fiber Optic Ring Repeater |
| Network Type | ControlNet (5 Mbps) |
| Function | Signal regeneration, retiming, fiber ring extension |
| Fiber Media | Single-mode / multi-mode fiber (depending on system design) |
| Topology | Ring, star, or point-to-point |
| Max Distance | Up to ~20 km (single-mode fiber dependent) |
| Backplane Power | 5 V DC (via repeater adapter) |
| Power Consumption | ~2.8 W typical |
| Isolation | Optical isolation between network segments |
| Installation | DIN rail / ControlNet repeater adapter system |
| Dimensions | 108 × 69 × 107 mm |
| Weight | 0.18 kg |
Function and Working Principle
The 1786-RPFRXL works as a physical layer repeater for ControlNet fiber networks.
Its operation includes:
- Receiving optical ControlNet signals from one fiber segment
- Regenerating and retiming the digital signal for integrity
- Transmitting the signal to the next fiber segment
- Maintaining deterministic timing required by ControlNet
- Enabling redundant ring topology communication paths
This ensures reliable communication even over long distances or in high-noise industrial environments.
Key Features
- Ultra-long distance fiber optic transmission support
- ControlNet ring topology redundancy
- High immunity to EMI and RFI interference
- Signal regeneration and retiming for network stability
- Supports distributed industrial network architectures
- Optical isolation between network segments
Industrial Applications
- Large-scale manufacturing plants
- Oil and gas facilities
- Power generation stations
- Mining and heavy industry sites
- Water treatment and utility networks
- Geographically distributed automation systems
Role in Industrial Systems
The module is used to:
- Extend ControlNet communication beyond standard limits
- Connect remote PLC racks and I/O systems
- Improve network reliability using ring redundancy
- Maintain signal integrity over long fiber distances
It is a network infrastructure component, not a control or I/O module.
Installation Notes
- Installed within ControlNet repeater adapter systems
- Requires compatible fiber optic cabling (single-mode or multi-mode depending on design)
- Must be properly configured within ControlNet network topology
- Power supplied via repeater adapter backplane
- Fiber polarity and termination must be correctly maintained
Compatible Equipment
- ControlNet PLC systems
- 1771 and 1756-series communication modules (via gateways)
- ControlNet repeaters (1786-RPA/B series)
- Industrial fiber optic infrastructure
Advantages
- Enables very long-distance industrial communication
- High resistance to electromagnetic interference
- Supports redundant ring network design
- Stable real-time ControlNet performance
- Suitable for harsh industrial environments
Limitations
- Legacy ControlNet technology (largely phased out in modern systems)
- Requires specialized fiber network design
- Not compatible with EtherNet/IP without gateway conversion
- Installation and configuration complexity is relatively high
Conclusion
The Allen-Bradley 1786-RPFRXL ControlNet Fiber Optic Ring Repeater Module is a specialized networking device used to extend and stabilize ControlNet communication over ultra-long distances using fiber optics.
It plays a critical role in legacy industrial automation systems where deterministic, high-reliability network communication is required across large physical installations.