Moxa Technologies ICF-1280I Hardware Installation Manual

 2013 Moxa Inc. All rights reserved.

P/N: 1802012800011

Moxa ICF-1280I Series

Industrial PROFIBUS-to-Fiber

Converter

Hardware Installation Guide

First Edition, August 2013

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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 package lost
when a fiber path is broken. The ICF-1280I converter also provides 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 that eliminates the need for a fiber optic sensor by using DIP
switch adjustments instead. 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 while radio and satellite
communication signals can be captured easily for decoding.

• High reliability and low maintenance: Fiber wires are immune to
adverse temperature and moisture conditions. As a result, they do
not corrode or lose signals, and are not affected by short circuits,
power surges, or static electricity.

Auto/Manual Baudrate Settings

The ICF-1280I series converters simply convert the signal 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 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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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 converter 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.

Fiber Link Monitoring

The ICF-1280I series converter provides a fiber link monitoring function
to detect the communication errors on both sides of the fiber connection.
When a communication error occurs, a red LED status indicator (P1, P2,
or Fault LED) will turn on and the relay alarm will activate. If a fiber
abnormality occurs on a remote fiber segment, the Fault LED will flash.
Engineers can then use the Fiber Diagnosis function for troubleshooting.

Reverse Power Protection

The Reverse Power Protection feature protects against accidentally
connecting the power cables to the wrong terminal. The converter is
designed to detect automatically which power wire is positive and which is
negative, and then adjust the power supply accordingly.

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 converters
eliminate 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.

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Using Remote Fiber Diagnosis:

Set DIP switch SW8 to the ON position on any ICF-1280I converter and
see the Ready LED status. A flashing green Ready LED indicates that the
Fiber Diagnosis has finished. The Fault LED indicates the location of the
fiber connection abnormality. The P1 or P2 LED indicates which side (Tx
or Rx) is causing the problem.

The Fault LED will shine a steady red to indicate an adjacent fiber
connection error, or flash red to indicate a non-adjacent fiber connection
error. If there are no fiber connection errors in the entire topology, the
related LEDs will shine green or remain OFF. If the fiber connection error
is adjacent to the converter, the status will also be indicated by the P1
(Port 1) or P2 (Port 2) LEDs. A flashing red light on P1 (or P2) means that
the Rx fiber cable connected to this port is broken. Similarly, a solid red
light on P1 (or P2) means that the Tx fiber cable in this port is broken. If
the fiber connection error is not adjacent to the converter (i.e., the fiber
cables connected to this converter are working properly), the Fault LED
will flash red. As a result, you should run Remote Fiber Diagnosis on every
other (second) converter in the topology to recursively troubleshoot the
problem. Further descriptions and troubleshooting can be found in the

Troubleshooting table.

Redundant Ring

The ICF-1280I series converters can connect PROFIBUS devices in a
redundant ring topology. Use the DIP switch to configure all the ICF­1280I 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.

How to form a redundant ring topology:

To form a redundant ring topology, connect the Tx Port (Port 1) on the
first ICF-1280I converter to the Rx Port (Port 2) on the following
converter. Then, connect the Tx Port (Port 2) on the first ICF-1280I
converter to the Rx Port (Port 1) on the preceding converter. Similarly,
connect the Rx Port (Port 1) on the first ICF-1280I converter to the Tx

Port (Port 2) on the following converter. Then, connect the Rx Port
(Port 2) on the first ICF-1280I converter to the Tx Port (Port 1) of the

preceding converter.