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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
  • 4 galvanically isolated channels
  • Ring redundancy
  • available in Multi-mode and Single-Mode


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.

ProfiHub B4FOR+ (Multi-Mode)

SKU: 17430
  • 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. 5km cable length
    • ring topology, bus topologies, star topolgies, 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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