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ProfiHub B4FOR+ (Single-Mode)

ProfiHub B4FOR+ (Single-Mode)

The ProfiHub B4FOR+ is a cost-effective solution to link PROFIBUS fiber optic to multiple RS 485 segments and vice versa. Additional to the other fiber optic repeaters, this module enables the installation of a ring topology, of which the status can be remotely monitored via the ComBricks web browser.

  • One fiber opitc channel, divided into 2 ports
  • 4 galvanically isoltated channels
  • Ring redundancy
  • Available in Multi-Mode and Single-Mode
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ProfiHub B4FOR+ - Fiber Optic to Multi Segment Coupler

The B4FOR+ supports multiple fiber optic topologies; ring-, point-to-point, bus and star. The protocol transparency without configuration, allows direct integration in existing PROFIBUS networks to benefit from the advantages optical data infrastructures offer.

The ProfiHub B4FOR+ is equipped with 4 galvanic isolated RS 485 channels utilizing a maximum of 31 devices per channel.

The mechanical design consists of a compact, flat and stable metal housing which can be mounted on a DIN-rail. It contains an alarm relay, redundant power supply, diagnostic LEDs and it supports the redundancy feature.


Technical specifications

RS 485

  • 4 galvanically isolated channels
  • 9.6 Kbps .. 12 Mbps (auto detection)
  • 1200m segment length (depends on baudrate)
  • Bus redundancy
  • Screw terminals and DB9 connectors
  • integrated termination


  • Transparent for all PROFIBUS DP protocols
  • Suitable for PROFISafe and MPI
  • High integrity telegram tracking

Fiber optic

  • One fiber optic channel, split into two ports
  • Max. 30km cable length
  • ring topology, bus topologies, star topolgies, point-to-point
  • Single-Mode 1310nm
  • Fiber cable G9 / 125 (OS1 or OS2)


  • Alarm contact
  • Power supply 12 ... 24 VDC
  • Redundant power supply
  • IP 20 classification
  • Temperature =25 ... +70*C
  • Dimensions (LxWxH): 167 x 111 x 40 mm

Want more information? Ask us.

Jonathan Machin ENG

Jonathan Machin

Global Sales Manager
T: +44(0)7534307696

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  • Procentec PROFIBUS Bytesize Training

    26 November 2020, 10 December 2020

    This online training is a mixture of an introductory course and a refresher training for users of PROFIBUS.

  • PROFIBUS Troubleshooting & Maintenance

    26 October 2020, 18 November 2020, 30 March 2021

    The PROFIBUS Troubleshooting and Maintenance training course is fully concentrated on those who install and maintain PROFIBUS installations.

  • Certified PROFIBUS Installer

    18 November 2020, 30 March 2021

    The Certified PROFIBUS Installer course is essential for electrical engineers and technicians requiring the necessary installation and testing skills for their PROFIBUS DP/PA projects.

Training overview