Configured for short-distance optical signal regeneration in ControlNet networks, the Allen-Bradley 1786-RPFS (1786-RPFS Distance Fiber Module) provides direct physical execution between ControlNet communication segments through HCS fiber media.

Model Configuration Details

The 1786-RPFS is a ControlNet short-distance fiber repeater module designed for converting and extending network communication through hard-clad silica (HCS) fiber. The module operates with 650 nm optical transmission and supports typical repeater distances up to 300 m.

Fiber Module Identification

Hardware Specifications

ControlNet Fiber Communication Characteristics

The 1786-RPFS provides optical conversion for ControlNet networks by regenerating communication signals between copper and fiber-based network segments. The module uses HCS fiber technology for short-distance transmission applications where optical isolation and signal extension are required.

The 650 nm optical interface is designed for the specified HCS fiber medium. Signal attenuation characteristics must be considered during network planning to maintain proper communication quality.

As part of the ControlNet repeater family, the module supports deterministic network communication by extending the physical transmission layer without modifying the ControlNet protocol structure.

Ordering Information

• 1 x Allen-Bradley 1786-RPFS ControlNet Distance Fiber Module
• 1 x ControlNet repeater module hardware assembly
• 1 x Fiber optic interface connection
• 1 x Product identification label
• 1 x Installation documentation

Field Installation Guidelines

Fiber Connection

• Use compatible 200/230 micron HCS fiber cable for the optical connection.
• Keep fiber connectors clean during installation to avoid optical signal degradation.
• Avoid excessive bending or mechanical stress on fiber cables.

Power Installation

• Verify the 5 V DC backplane power source before module installation.
• Confirm available backplane current capacity before adding the repeater module.
• Install the module according to the ControlNet network architecture.

Network Layout

• Place the repeater within the specified fiber distance range.
• Maintain correct fiber transmit and receive channel orientation.
• Verify attenuation values when commissioning extended communication paths.

Cabinet Installation

• Install the module in a protected industrial enclosure.
• Maintain sufficient clearance for cable routing and inspection.
• Separate fiber routing from high-current electrical wiring.

Frequently Asked Questions

• What is the primary function of the 1786-RPFS?

  The 1786-RPFS extends ControlNet communication by converting and regenerating signals through short-distance HCS fiber connections.

• What fiber cable type is supported by this module?

  The module is specified for 200/230 micron HCS (hard-clad silica) fiber used in ControlNet repeater applications.

• What optical wavelength does the module use?

  The fiber interface operates at 650 nm red optical wavelength for communication signal transmission.

• What is the typical repeater distance capability?

  The module supports typical repeater distances from 0 to 300 m according to the specified fiber medium.

• What power source does the module require?

  The 1786-RPFS receives power through a 5 V DC backplane connection within the ControlNet system.

• How much backplane current does the module draw?

  The specified backplane current draw is 300 mA during operation.

• Does the module change ControlNet communication protocol data?

  No. The module operates at the physical layer and regenerates network signals without changing protocol data.

• What installation factor affects optical performance?

  Fiber cleanliness, cable condition, connector alignment, and attenuation levels affect optical communication performance.