Allen-Bradley 1786-RPFS ControlNet Short-Distance Fiber Module

Allen-Bradley 1786-RPFS ControlNet Short-Distance Fiber Module

Configured for optical signal regeneration and physical media translation in ControlNet communication networks, the Allen-Bradley 1786-RPFS (1786-RPFS ControlNet Short-Distance Fiber Repeater Module) provides direct physical/electrical execution. It interfaces directly with ControlNet repeater adapter bases to extend deterministic network segments through multi-mode optical fiber links, providing complete galvanic isolation and immunity to high-intensity electromagnetic interference (EMI).

Hardware Specifications

Deterministic Network Isolation & Media Translation

The module interfaces directly with ControlNet repeater backplanes to translate electrical coax signals into optical pulses without adding packet frame latency. Built for high-noise industrial environments, it enforces complete channel-to-channel ground isolation across nodes. System architecture relies on strict backplane bus communication velocity and firmware flash compatibility to ensure real-time deterministic frame retiming, signal amplification, and fault containment without degrading overall network throughput or frame synchronicity.

Frequently Asked Questions

Q: Can the 1786-RPFS module be replaced under power without stopping network traffic?

A: Yes. The module supports hot-swappable installation into a powered 1786 repeater adapter base, provided the surrounding environment is non-hazardous or determined to be free of ignitable gas concentrations.

Q: What are the backplane current draw requirements for this module?

A: The module draws a maximum backplane current of 300 mA at 5 VDC from the host 1786 repeater base assembly.

Q: Does the module support single-mode fiber optic cabling for distances exceeding 300 meters?

A: No. The 1786-RPFS transceivers are calibrated specifically for 850 nm multi-mode fiber (62.5/125 um) up to 300 m. For long-distance single-mode links, an equivalent long-distance fiber module must be utilized.

Field Installation Guidelines

Mount the 1786-RPFS firmly into the designated 1786 repeater base slot until the side locking mechanisms engage completely. Ensure all ST optical connectors are clean and dust-free prior to insertion; use dedicated lint-free optical wipes cleaned with isopropyl alcohol if contamination occurs. Maintain the minimum bending radius of the multi-mode fiber cable according to manufacturer specs (typically no less than 30 mm) to prevent micro-bending signal attenuation. Ensure the outer metal chassis of the repeater base assembly connects to a low-impedance functional earth (FE) bus via DIN-rail contact points or grounding straps.