Allen-Bradley 1786-RPFRL
Allen-Bradley 1786-RPFRL
Allen-Bradley 1786-RPFRL
Allen-Bradley 1786-RPFRL
Allen-Bradley 1786-RPFRL
Allen-Bradley 1786-RPFRL
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  • Lifecycle status

    Discontinued
    Discontinued date: 2022-09-30
    Replacement category: Engineering Replacement

1786-RPFRL

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Allen-Bradley 1786-RPFRL is a two-channel ControlNet fiber-ring repeater for 62.5/125 µm multimode fiber with a 15 dB optical budget.
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Technical specifications for 1786-RPFRL

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1786-RPFRL
  • Product Family:
    1786 Repeaters
  • Product Type:
    Long-Distance ControlNet Fiber Ring Repeater Module
  • Stock:
    1
  • Fiber Topology:
    Redundant optical ring
  • Fiber Channels:
    2
  • Fiber Type:
    62.5/125 µm multimode
  • Communication Rate:
    5 Mbps
  • Required Adapter:
    1786-RPA/B
  • Current Load:
    570 mA at 5 V DC maximum
  • Power Dissipation:
    2.8 W
  • Relay Rating:
    900 mA at 30 V DC, Class 2 resistive
  • Operating Temperature:
    0°C to 60°C
  • Storage Temperature:
    -40°C to 85°C
  • Relative Humidity:
    5% to 95%, non-condensing
  • Dimensions:
    10.5 × 11.5 × 7 cm
  • Maximum ControlNet Network Length:
    20 km or less
  • Ring Member Modules:
    20 maximum
  • Weight:
    0.18 kg
  • Tariff Code:
    8517623990
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Ring Layout Optical Link Return to Service Application
  • Two-channel long-distance ControlNet fiber-ring repeater
  • Works with the 1786-RPA/B repeater adapter
  • Supports 62.5/125 µm multimode fiber

1786-RPFRL carries ControlNet traffic around a redundant optical ring rather than extending a single radial fiber path.

Its two channels maintain the ring path while local indicators and a relay expose conditions needed during commissioning and fault isolation.

Correct fiber polarity and distance budgeting are central to a successful replacement because optical continuity cannot be inferred from physical connector engagement alone.

Availability, condition, price, and shipping time for 1786-RPFRL are confirmed during quotation.

Allen-Bradley 1786-RPFRL Long-Distance ControlNet Fiber Ring Repeater Module Manuals, Datasheets, Links

Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

  • Install no more than two 1786-RPFRL/B modules on one 1786-RPA/B adapter
  • Limit a fiber ring to 20 member modules and the complete ControlNet network to 20 km or less
  • Route the two optical channels separately and preserve the documented RX-to-TX ring direction
  • Use 62.5/125 µm multimode fiber at 1300 nm with ST connectors
  • Keep total connector, splice and fiber loss below the 15 dB optical budget
  • Use plastic or ceramic ST connectors; do not install metal ST connectors
  • Set SMAX at least one address above the highest scheduled ControlNet node
  • Verify both channel LEDs and the external fault-relay response during a controlled link interruption
  • Confirm ring recovery without exceeding the 20-member or 20 km network limits
  • Long-distance ControlNet segment extension
  • Redundant fiber-ring communication
  • EMI-resistant links between separated industrial areas
Description
Allen-Bradley 1786-RPFRL extends ControlNet through a redundant long-distance fiber ring and operates with a 1786-RPA/B repeater adapter.

The module provides two optical channels for 62.5/125 µm multimode fiber, channel activity indication, and a relay contact used to report ring or module conditions to external monitoring circuits.

A replacement must preserve the ring direction, paired fiber paths, connector type, adapter placement, optical distance budget, relay wiring, and the order of adjacent repeater modules.
Revisions

Revision Part #

Also known as

1786-RPFRL/B
1786-RPFRL Series B
Alternative Names
1786-RPFRL Allen-Bradley 1786-RPFRL Rockwell Automation 1786-RPFRL 1786-RPFRL/B Allen-Bradley 1786-RPFRL/B Allen-Bradley ControlNet 1786-RPFRL
Technical notes
1786-RPFRL/B requires a 1786-RPA/B adapter, 62.5/125 µm multimode fiber, plastic or ceramic ST connectors and a verified 15 dB optical-loss budget; use no more than two ring repeaters per adapter, 20 members per ring and 20 km for the complete ControlNet network.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What must remain unchanged when replacing Allen-Bradley 1786-RPFRL in a live ring design?
Preserve the two fiber-channel paths, ring direction, multimode fiber type, connector assignments, relay wiring, and physical position beside the 1786-RPA/B adapter.
Can Allen-Bradley 1786-RPFRL be installed without 1786-RPA/B?
No. The official architecture requires the repeater adapter to power and connect the fiber-ring repeater module.
Is single-mode fiber suitable for Allen-Bradley 1786-RPFRL?
No. Rockwell Automation specifies 62.5/125 µm multimode fiber for this model; use the catalog specifically intended for other fiber types and distances.
What can cause channel activity to disappear on Allen-Bradley 1786-RPFRL?
Check fiber polarity, connector seating and cleanliness, damaged fiber, excessive optical loss, the paired repeater, adapter power, and ring continuity.
How should Allen-Bradley 1786-RPFRL be positioned with other repeater modules?
Follow the official module-ordering rules at the 1786-RPA/B adapter, especially when copper or extra-long-distance repeater modules share the assembly.
What should be proven after servicing Allen-Bradley 1786-RPFRL?
Verify both optical channels, ring recovery behavior, channel indicators, external relay operation, and stable ControlNet communication before closing the maintenance window.
Why can Allen-Bradley 1786-RPFRL restore one optical channel without restoring ring redundancy?
Check both transmit and receive paths, channel polarity, ring direction, connector cleanliness, optical loss, the partner repeater, and the 1786-RPA/B assembly rather than treating one active channel as a complete ring.