ABB PFXA401SF (3BSE024388R4) – PROFIBUS DP Single‑Mode Fiber Link Adapter for Long‑Distance, Noise‑Immune Fieldbus

• Warranty: 365 days

• Lead time: In-stock items ship in about 1 week; no more than 1 month at the latest

• Payment: 50% advance payment; full payment prior to delivery

• Express: FedEx, UPS, DHL

• Tested before shipment: Functional check and visual inspection, anti‑static packaging

• Single‑mode fiber extension for PROFIBUS DP – Typically deployed when you need reliable communication over long distances or across high‑noise areas.

• Electrical to optical isolation – Breaks ground loops and reduces EMC susceptibility on RS‑485 copper runs.

• Transparent to the PLC/DCS – No application changes; it appears as a standard DP link component to controllers and devices.

• DIN‑rail cabinet mounting – Fits standard TS‑35 rails for fast installation alongside existing I/O and network gear.

• Industrial power input – 24 VDC supply typical for control cabinets.

• Designed for ABB ecosystems – Commonly used with ABB PROFIBUS DP networks in Freelance/800xA environments, and compatible with multi‑vendor DP devices in most cases.

Plants typically deploy the PFXA401SF wherever PROFIBUS must cross long distances or harsh electrical environments. Common cases include:

• Process automation (refining, chemicals, pharmaceuticals) where cabinets are far from field skids

• Water & wastewater facilities connecting remote pump stations or clarifiers

• Metals, mining and cement, where VFDs and heavy machinery create significant EMI

• Power generation and utilities – turbine halls to control rooms over single‑mode fiber

• Food & beverage lines with distributed PROFIBUS nodes across multiple halls

A maintenance engineer told us they swapped copper for fiber after intermittent DP faults near large drives; the PFXA401SF stabilized the segment without touching device parameters—just a tidy cabinet rewire and it ran for months with zero retries logged.

• Reliability – Optical isolation helps reduce CRC errors and bus resets in noisy areas.

• Compatibility – Works within ABB PROFIBUS DP networks and, in many cases, mixed‑vendor DP topologies.

• Cost control – Extends existing DP infrastructure over fiber without replacing PLCs, remote I/O, or device GSDs.

• Simple lifecycle – Standard 24 VDC supply, DIN‑rail mounting, and straightforward wiring save installation time.

• Technical support – Documentation and diagnostics align with common ABB fieldbus practices, easing commissioning.

• Cabinet environment – Mount on TS‑35 rail in a clean, ventilated enclosure; keep ambient within typical control‑room ranges and avoid direct heat sources.

• Wiring tips – Use shielded PROFIBUS cable on the copper side; maintain proper termination. Route fiber away from sharp bends; observe minimum bend radius for single‑mode.

• Grounding & EMC – Bond shields at designated points; separate power and signal wiring. Fiber side provides galvanic isolation, which usually helps in high‑noise bays.

• Commissioning – Verify DP baud rate and segment planning; check optical power with a light meter if available to confirm link budget.

• Routine maintenance – Periodically clean fiber connectors, inspect for cable stress, and log DP diagnostics. Firmware updates are rarely needed for passive link adapters, but if supported, schedule during planned outages.

• Safety – De‑energize 24 VDC before wiring; use ESD protection when handling electronics; cap fiber connectors when not in use.

• Certifications – CE and RoHS compliance are typical for ABB industrial networking components; manufacturing under ISO 9001 quality systems.

• Warranty – 12 months (365 days) replacement/repair support as stated above.