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PROFIBUS Single-Mode Fiber Optic Ring

PROFIBUS Single-Mode Fiber Optic Ring

The ComBricks Fiber Optic Ring module for single-mode technology (ComBricks FO Ring SM) ensures reliable optical data transmission in PROFIBUS networks. This multifunctional module is specifically designed by PROCENTEC to create optical redundant ring topologies with singlemode fiber optics. It allows long cable distances up to 30 km and a galvanic isolation between devices and segments. The ComBricks FO Ring SM module is especially suitable for applications in heavy EMC environments such as water treatment, mines and tanks.

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The ComBricks FO Ring SM module contains diagnostic LEDs which indicates the detection of a low level on the optics. Just like any other communication module, the channels are connect directly to the ProfiTrace OE core in the Head Station. An advanced email functionality will alert you when faults like low level or broken ring arise. Because busmonitor data is directly available in the web server, it allows technicians to optimal maintain a PROFIBUS installation.

ComBricks FO Ring SM can be placed side by side with repeater modules allowing spur line diagnostics. It can also easily be used as a fully dedicated fiber optic modules mixed with copper segments. The advanced 12 Mbps core of the fiber optic module can be cascaded unlimited with other fiber modules.

combricks fiber optic single mode combricks fiber optic point to point single mode



This product is UL-listed. Read more about UL-certification.


Technical specifications

Characteristics fiber optics

  • 2 fiber optic channels (single mode)
  • Max. cable length 30 km
  • Ring, point-to-point and line topologies
  • 4 ST/BFOC-connectors
  • Single mode cable G9 / 125 (OS1) – 1310 nm
  • Ring redundancy (switchable)
  • Unlimited cascading
  • Optical budget: 17dB
  • Optical loss: 0,4dB per km

ComBricks characteristics

  • Warning at low fiber optic signal levels
  • Email notifications in case of certain events


  • Transparent for all PROFIBUS protocols
  • 9,6 kbps – 12 Mbps (automatic baudrate detection)
  • No PROFIBUS address needed
  • Transmission speed detection: Auto detect (< 10 s detection and 50 s time out)


  • 4 networks selectable with DIP-switches
  • 10 modules (in the first 10 slots)
  • Power supply: provided through the backplane
  • Compatible backplane units: 101-200011, 101-200012, 101-200023, 101-200024, 101-200027


  • Dimensions (LxWxH): 115 x 100 x 25 mm (without backplane)
  • Weight: 122 g
UL listed ePLAN

Want more information? Ask us.

Jonathan Machin ENG

Jonathan Machin

Global Sales Manager
T: +31(0) 682671130


Below you can find all available downloads for this product.

Product card
User manual
Data sheet

Service & Support


Check the most frequently asked questions about ComBricks.

On-site & Online Support

Worldwide PROFIBUS and PROFINET support; on-site and online.

Network Certification

Find out what PROCENTEC can certify in your network.

GSD files

Find and download all the GSD files you need.


  • Procentec PROFIBUS Bytesize Training

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

  • PROFIBUS Troubleshooting & Maintenance

    09 November 2021, 17 November 2021, 06 December 2021

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

  • Certified PROFIBUS Installer

    09 November 2021, 17 November 2021, 06 December 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