Moxa ICF-1280I-S-ST-T [2/16] Introduction
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Moxa ICF-1280I-S-ST-T [2/16] Introduction

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Introduction
The ICF-1280I series PROFIBUS-to-fiber converters are based on the
PROFIBUS DP standard, and are compliant with EN 50170. The converters
are mainly used to extend the transmission distance of PROFIBUS devices
over optical fiber, and provide redundant transmission. More specifically
the ICF-1280I series converts PROFIBUS signals between copper and
fiber wires, and extends PROFIBUS transmission up to 4 km (for
multi-mode models) or up to 45 km (for single-mode models). In addition,
the ICF-1280I series converters have dual fiber ports that can be used to
form a ring topology for redundant transmission, and avoid packet loss
when a fiber path is broken. The ICF-1280I converters also provide 2 kV
isolation protection for the PROFIBUS system and dual power inputs to
ensure uninterrupted operation.
The ICF-1280I series converters are uniquely designed with Remote Fiber
Diagnosis, which uses DIP switches to eliminate the need for fiber optic
sensors. Remote Fiber Diagnosis can detect fiber connections for the
overall topology from any individual converter, and determine which side
(Tx or Rx) is causing the problem for the converter.
Why Convert PROFIBUS to Fiber?
Optical fiber communication not only extends the communication
distance, but also provides the following advantages:
• Immunity to electrostatic interference: Fiber is immune to
electromagnetic interference and radio frequency interference. It
provides a clean communication path and is immune to cross-talk.
• Insulation: Optical fiber is an insulator interface; the glass fiber
eliminates the need for using electric currents as the communication
medium.
• Security: Fiber cannot be tapped by conventional electric means and
is very difficult to tap into optically, whereas radio and satellite
communication signals can be captured easily for decoding.
• High reliability and low maintenance: Fiber cable is immune to
adverse temperature and moisture conditions. As a result, it does not
corrode or lose its capacity to transmit signals, and is not affected by
short circuits, power surges, or static electricity.
Auto/Manual Baudrate Settings
The ICF-1280I series converters convert the signal back and forth
between PROFIBUS and fiber at baudrates from 9.6 kbps to 12 Mbps.
Engineers do not need to know the baudrate of the connected PROFIBUS
device; the ICF-1280I series 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.
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

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