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ProfiHub B2FOR+ (Single-Mode)

ProfiHub B2FOR+ (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 optic channel, split into 2 ports
  • 2 galvanically isolated channels
  • Ring redundancy
  • available in Multi-mode and Single-Mode
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ProfiHub B2FOR+ - Fiber Optic to Multi Segment Coupler

The B2FOR+ 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 B2FOR+ is equipped with 2 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

  • 2 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): 129 x 111 x 40 mm

Downloads and extra information

EU Certificate of Conformity



  • PROFIBUS Troubleshooting & Maintenance

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

  • Certified PROFIBUS Installer

    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.

  • Certified PROFIBUS Engineer

    'Distinguish yourself from the others and show that you are the expert.....Become a Certified PROFIBUS Engineer.'

Training overview