1786-RPFS | Allen Bradley | ControlNet Repeater

Configured for signal amplification and media transition in ControlNet networks, the Allen Bradley 1786-RPFS (1786-RPFS Repeater) provides direct physical/electrical execution of fiber-optic signal extension. This module facilitates the transmission of ControlNet data over short-distance hard-clad silica (HCS) fiber media, effectively extending the physical reach of the network while maintaining deterministic communication timing across segmented media infrastructures.

Hardware Specifications

Deterministic Network Integration

The 1786-RPFS is engineered to maintain timing integrity within ControlNet deterministic networks. By converting coaxial copper signals to fiber-optic media, the module permits the scaling of network topologies beyond the limitations of standard copper cabling. The backplane bus communication velocity and latency characteristics are calibrated to remain consistent with ControlNet scheduling requirements, ensuring that no jitter or signal corruption is introduced during the media conversion process. Firmware flash compatibility and network scheduling must be validated through the host controller's configuration software to ensure alignment with the overall network segment configuration.

Frequently Asked Questions (FAQ)

Q: What is the maximum fiber link distance supported by the 1786-RPFS?

A: The module supports a maximum transmission distance of 300 meters when utilizing 200/230 micron hard-clad silica (HCS) fiber.

Q: Is this module compatible with standard 62.5/125 micron multimode glass fiber?

A: No. The 1786-RPFS is specifically designed for 200/230 micron HCS fiber. Attempting to use incompatible fiber diameters will result in severe signal attenuation and link failure.

Field Installation Guidelines

• Fiber Termination: Use an approved crimp-and-cleave or polished termination method compatible with 200/230 micron HCS fiber. Ensure the fiber end-face is clean and free of contaminants to meet the 4.2 dB attenuation limit.
• Cable Handling: Observe the minimum bend radius specifications for the HCS fiber cable during routing to prevent micro-cracks in the silica cladding, which can lead to signal loss.
• Grounding and Isolation: While the fiber optic link provides inherent electrical isolation, ensure that the 5 VDC power supply to the repeater module is referenced to a common system ground to minimize potential differences at the module power interface.
• Environmental Segregation: Route fiber optic cables in dedicated trays or conduits, keeping them separate from high-voltage AC lines. Although immune to electromagnetic interference, the cable jacket and fiber optics must be protected from physical crush forces and extreme heat.