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One fiber-optic channel, split into 2 ports

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.

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

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 of optical data infrastructures offer.

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

Product Information


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

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

Fiber optic

  • One fiber-optic channel, split into two ports
  • Max. 5km cable length
  • Ring topology, bus topologies, star topologies, point-to-point
  • Multi-Mode 1310nm
  • Fiber cable G50-G62.5 / 125 (OM1)


  • 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

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