Configured for optical signal regeneration in ControlNet fiber ring networks, the Allen-Bradley 1786-RPFM (1786-RPFM ControlNet Fiber Ring Medium Repeater) provides direct physical/electrical execution for dual fiber communication extension.

Model Configuration Summary

The 1786-RPFM is a ControlNet fiber optic repeater module designed for converting and extending ControlNet network communication through dual fiber optic channels. The module supports 62.5/125 um multi-mode fiber and provides fiber transmission distances up to 3 km under specified network conditions.

Configuration Details

Hardware Specifications

ControlNet Network Extension Characteristics

The 1786-RPFM performs physical layer signal regeneration for ControlNet networks by using fiber optic transmission paths. The module supports fiber ring architectures where optical channels are used to extend communication distance and provide alternative network routing paths.

The module operates with deterministic ControlNet communication timing and maintains network data transfer through optical conversion. Fiber media removes electrical interference effects commonly associated with long copper communication segments.

The module integrates with Allen-Bradley ControlNet infrastructure and supports network configurations requiring fiber media conversion, extended distance communication, and ring-based layouts.

Ordering Information

• 1 x Allen-Bradley 1786-RPFM ControlNet Fiber Ring Medium Repeater module
• 1 x Fiber optic communication interface assembly
• 1 x DIN rail mounting mechanism
• 1 x Hardware identification label
• 1 x Technical product documentation

Field Installation Guidelines

Mounting

• Install the module on a standard DIN rail with adequate mechanical support.
• Maintain sufficient cabinet clearance for fiber cable routing and connector access.
• Verify module placement according to ControlNet network layout requirements.

Fiber Connection

• Use 62.5/125 um multi-mode fiber optic cable as specified.
• Keep fiber connectors clean and protected from contamination during installation.
• Avoid sharp bending of fiber cables to prevent optical signal loss.

Power Connection

• Connect the module through the ControlNet system backplane power interface.
• Verify the 5 V DC backplane supply condition before installation.
• Confirm current loading remains within the available backplane capacity.

Network Wiring

• Separate fiber cables from high-voltage power conductors where possible.
• Confirm optical channel orientation before commissioning.
• Validate communication status after fiber link connection.

Frequently Asked Questions

• What communication protocol does the 1786-RPFM support?

  The module supports Allen-Bradley ControlNet communication networks and functions as a fiber optic repeater for ControlNet physical layer extension.

• What fiber type is compatible with this repeater?

  The 1786-RPFM is specified for 62.5/125 um multi-mode fiber optic cable used in ControlNet fiber applications.

• What is the maximum typical repeater distance?

  The module supports typical fiber repeater distances from 0 to 3 km depending on cable conditions and network design.

• What is the operating wavelength of the fiber interface?

  The fiber optic interface operates at 1300 nm wavelength for multi-mode optical communication.

• Does the module require external input power?

  The module uses a 5 V DC backplane power connection within the ControlNet communication system.

• How much backplane current does the module consume?

  The specified backplane current draw is 400 mA maximum at 5 V DC.

• Can the module be installed on a DIN rail?

  Yes. The 1786-RPFM is designed for DIN rail mounting inside industrial control cabinets.

• What installation consideration applies to fiber connections?

  Fiber connectors must remain clean, properly aligned, and protected from excessive bending or mechanical stress.