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Industrial PROFIBUS-to-fiber converters with redundant fiber ring



Industrial PROFIBUS to Fiber Optic Converter, Single-mode, ST connector, 0 to 60°C

0 products currently in stock.

The stock was last updated at 5:02 pm Friday, 12 July, 2024. Please contact us for lead times if needed.

Series Description


The ICF-1280I industrial PROFIBUS-to-fiber converters are used to convert PROFIBUS signals from copper to optical fiber. The converters are used to extend serial transmission up to 4 km (multi-mode fiber) or up to 45 km (single-mode fiber). The ICF-1280I Series provides 2 kV isolation protection for the PROFIBUS system and dual power inputs to ensure that your PROFIBUS device will perform uninterrupted.

Remote Fiber Diagnosis

Optical fiber cables are often deployed for long-distance communication and a fiber-optic inspection pen is used by engineers to ensure proper communication quality of the fiber cable. The ICF-1280I Series eliminates the need for a fiber-optic inspection pen by providing a Remote Fiber Diagnosis function that uses DIP switch adjustments.

There are two major functions provided by Remote Fiber Diagnosis: (1) determining which side (Tx or Rx) is causing the problem on the converter; (2) examining the fiber connections for the overall topology from any individual converter. Fiber cable abnormalities can be automatically detected and identified by the LED indicator even if it is not adjacent to the converter. Remote Fiber Diagnosis facilitates fiber cable deployment and management, and also significantly shortens troubleshooting time by examining fiber connections for the overall topology from any individual converter.

Redundant Ring

The ICF-1280I Series of converters can connect PROFIBUS devices in a redundant fiber ring topology. Use the DIP switch to configure all the ICF- 1280I converters to redundant ring mode. When a PROFIBUS master transmits a signal from one converter to the PROFIBUS slave devices, this signal will travel to all the converters around the ring until it returns to the original converter and terminate. The redundant ring structure ensures no packet loss with zero recovery time.

PROFIBUS Fail-safe

Electrical noise may be generated
when a PROFIBUS device malfunctions or the serial interface fails,
resulting in bus failure. Traditional media converters transmit noise
signals through the fiber wire to the other converter. This not only
disrupts data communication between the two buses, but will also bring
communication across the entire system to a halt. When this occurs,
the engineers will not be able to easily locate the failed device
because the entire PROFIBUS network is down. To avoid this situation,
the ICF-1280I Series has a mechanism to detect and recognize noise
signals. If the bus fails on one side, the noise signal will not propagate
through the ICF-1280I converter and affect additional bus segments.
In addition, the ICF-1280I converter will also trigger an alarm to
provide the location of the failure to the field engineer.

Auto/Manual Baudrate Settings

The ICF-1280I converters convert signals back and forth between PROFIBUS and fiber at baudrates between 9.6 kbps to 12 Mbps. Engineers do not need to know the baudrate of the connected PROFIBUS device; the ICF-1280I converters can automatically detect the baudrate of the PROFIBUS device and apply this baudrate directly. This is an extremely convenient feature. If necessary, baudrates can be set to a fixed value via DIP switches to shorten the baudrate detection period when the system initializes.

Fiber Link Monitor

The ICF-1280I converters support a fiber link monitoring function to detect communication errors on both sides of the fiber connection and determine which side (Tx or Rx) is causing the problem. When a communication error occurs, a red LED status indicator will turn on and the relay alarm will activate. If a fiber abnormality occurs at a remote fiber segment, the Fault LED will flash to indicate the abnormality was in the remote segment. Engineers can use the fiber test function for troubleshooting.

Fiber Signal Intensity Diagnosis

In some circumstances, you may need to measure the receive level of the fiber-optic port with a voltmeter, which can be connected while the device is operating (doing so will not affect data transmission). The measurement can be taken with a voltmeter and read on a PLC that uses floating high impedance analog inputs, which allow you to do the following:

  • Record the incoming optical power for later measurement (e.g., to indicate aging or damage).

  • Carry out a good/bad test (limit value).

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Product Brand

Moxa is a leading provider of edge connectivity, industrial computing, and network infrastructure solutions for enabling connectivity for the Industrial Internet of Things (IIoT). With over 35 years of experience, they help industrial enterprises overcome roadblocks and achieve operational resilience through purpose-built OT networking and cybersecurity. They are dedicated to changing the world through the power of connectivity, driving industrial transformation.

ICF-1280I Series

The ICF-1280I-S-ST is part of a wider series. A series refers to a collection of related products or components designed to work together seamlessly, typically within a specific industry or application. These series often share similar features and functionalities, ensuring compatibility and ease of integration for users.

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Name Type Version Release Date

Datasheet for ICF-1280I Series

2.3 MB


Dec 19, 2022

Dec 19, 2022

QIG for ICF-1280I Series

2.2 MB


May 04, 2021

May 04, 2021

2D CAD for ICF-1280I

300.5 KB

2D CAD  
May 20, 2016

May 20, 2016

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Supported Documents & Firmware Last Updated: July 12, 2024