Profibus Fiber Optic Converter

Profibus to Self-healing Ring Fiber Converter

HFD-FO-PRO Profibus Ring Optical Link Module

Transmission rate:

The HFD-FO-PRO Profibus Ring Optical Link Module support all the transmission speeds (transmission rates) defined in the EN 50170 standard::  9.6 kBit/s, 19.2 kBit/s, 45.45 kBit/s, 93.75 kBit/s, 187.5 kBit/s,500 kBit/s,1.5 MBit/s, 3 MBit/s, 6 MBit/s

The transmission rate is set automatically as soon as the

HFD-FO-PRO Profibus Ring Optical Link Module

receives a frame. The setting or adjustment is dependent on the transmission rate. Depending on the

HFD-FO-PRO Profibus Ring Optical Link Module

Settings in automatical mode, this can last a maximum of between 0.1 s (at 12 MBit/s) and 2.5 s (at 9.6 KBit/s).If the transmission speed has not been recognized, the outputs of all ports are blocked. If the transmission rate changes during operation, this is detected by the modules, which then automatically adjust their settings accordingly.Transfer malfunctions may temporarily occur while the rate is being altered.

Signal regenerationThe modules regenerate the signal form and amplitude of the data received. This allows up to HFD-FO-PRO Profibus Ring Optical Link Module to be cascaded.

Segment monitoring at the RS 485 port

Each receiver monitors the RS 485 bus segment connected to it for faulty frames or continuously busy networks. If faulty frames are received by the receiver, or if the network is busy for longer than the maximum permitted send time, forwarding of the received signals is blocked until frames can be received again correctly, or if no signal is received for 3 * 11385 BIT Times.

Segment monitoring at the optical line

Each receiver monitors the optical line port connected to it for receiving frames and status. If faulty frames are received by the receiver, or no single for longer than the maximum permitted time, forwarding of the received signals is blocked until the port status is ok, frames can be received again correctly.

Network Topology: Redundant ring(Self-healing Ring)

Technical Data

Voltage/power supply

5V/12V/24V DC,Dual Power Supply

Operating voltage


Current consumption

typ. 80 mA@24V

Output voltage/current (Pin 6 Sub-D socket)

5 V +5%,–10%/ 90 mA

Signaling contact Signal transmission

Max .switch DC24V@2A or This email address is being protected from spambots. You need JavaScript enabled to view it.

Transmission rate

9.6; 19.2; 45.45; 93.75; 187.5; 500 kBit/s,1.5; 3; 6M;

Setting transmission rate

Automatic or Switch setting

Bit error rate

< 10-9

Electrical port

DB9 Female Connector or Terminal

Input/output signal

RS 485 level

PIN assignment

EN 50170 Part 1

Optical ports

2 or 4 (4 as standard)



optical power:– in glass fiber 9/125um

– in glass fiber G 62.5/125

-9dBm  –  -18 dBm

-13 dBm –  -20 dBm

Receiver sensitivity


Transmission distance:with glass fiber 9/125um

with glass fiber G 62,5/125

0 – 20,000 m (0.3 dB/km)

0 – 3,000 m  (2.0 dB/km)





Ambient temperature

-30 °C to +70 °C

Storage temperature

–40 °C to +85 °C

Relative humidity

<95 %, non-condensing

Protection class

IP 30

Dimensions (W x H x D)

43(W) x 88.5(D) x 124.5(H) mm

Housing material/Color

Die-cast zinc/Black


approx. 650 g


Electromagnetic compatibility (EMC)

Limit class B (EN 55022)

EN 61000-4-2

EN 61000-4-3)

Burst:     On power supply lines and shielded RS 485 bus lines: ±2 kV (EN 61000-4-4)

Surge: Power lines: ±1 kV symmetrical,Shielded RS 485 lines: ±2 kV asymmetrical (EN 61000-4-5)

Ordering Information:

Model Number


Fiber No.

Fiber Mode

Fiber Connector


Redundant Ring Link,Dual Fiber(BI-DI), 2km


Multi Mode



Redundant Ring Link,4 Fiber, 2km


Multi Mode



Redundant Ring,Dual Fiber(BI-DI), 20km


Single Mode



Redundant Ring,4 Fiber, 20km


Single Mode



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