Draws your attention to important information on handling the product, a particular part of
the documentation or the correct functioning of the product.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted,
in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior
written permission of the publisher.
Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning sign
and are marked as follows according to the level of danger:
Warning
This device and its components may only be used for the applications described in this manual and only in
connection with devices or components that comply with PROFIBUS and an RS 485 interface. This product can
only function correctly and safely if it is transported, stored, set up, installed, operated and maintained as
recommended.
Qualified Technicians
Only qualified technicians should be allowed to install and work with this equipment. Qualified technicians are
defined as persons who are authorized to commission, to ground, to tag circuits and systems in accordance
with established safety practices and standards. It is recommended that the technicians carry a Certified
PROFIBUS Installer or Certified PROFIBUS Engineer certificate.
Disclaimer of Liability
We have checked the contents of this manual as much as possible. Since deviations cannot be precluded
entirely, we cannot guarantee full agreement. However, the content in this manual is reviewed regularly and
any necessary corrections included in subsequent editions. Suggestions for improvement are welcomed.
This manual explains how to put the ProfiHub B2FO2+ into operation.
Recycling and Disposal
The parts of the ProfiHub can be recycled. For further information about environment-friendly recycling and
the procedure for disposing of your old equipment, please contact:
Document Updates
You can obtain constantly updated information on PROCENTEC products on the Internet at
www.procentec.com. You can also contact PROCENTEC Customer Support:
ProfiHub B2FO2+ is an advanced, flexible and robust network component for PROFIBUS DP installations, to
create fiber optic backbone structures and long multi-device star/tree segments.
PROFIBUS DP is a high speed communication bus that must comply with strict rules concerning spur lines,
because of possible reflections that could lead to communication disturbances. If spur lines or star segments
are required, costly investments in repeaters have to be done.
The innovative ProfiHub B2FO2+ is the perfect component for such applications. It is an economic solution to
realise reliable spur lines in high speed DP networks. They have the functionality of 2 galvanic isolated
transparent repeaters and an optical link module in one device. This allows network structures with extended
spur lines that individually can handle a maximum of 31 devices and a length equal to the main bus. The
ProfiHub B2FO2+ refreshes a received message on one Channel and transfers it to all the other Channels
(chicken foot topology).
Because the ProfiHub B2FO2+ creates isolated segments, the devices can now be removed and added during
operation. Also most electrical bus problems and EMC disturbances in a spur do not spread to the other
segments. The intelligent logic and isolation circuits of the ProfiHubs do not change the bit width. This means
the ProfiHubs do not have limitations in serial placement. The logic also detects the transmission speed
automatically.
To assist the installation work, termination is integrated and can be switched on/off. The grounding concept is
also selectable: direct or capacitive grounding. The ProfiHubs are powered by a 12 to 24 DC Voltage. For
troubleshooting, maintenance and commissioning the ProfiHubs are equipped with LEDs on the outside, which
indicate the status of each Channel (Data and Error).
2 Galvanic isolated outgoing channels (repeater segments).
2 Fiber Optic channels.
Transparent for all PROFIBUS DP protocols.
DP - RS 485 specifications for each channel.
Cable redundancy for copper channel 1 and 2
9.6 Kbps to 12 Mbps.
31 devices per channel.
3000 m cable length for FO channel 1 and 2
1200 m spur line length for copper channel 1 and 2 (depends on transmission speed).
Redundant power supply
No limit in serial placement or cascading of ProfiHubs.
Alarm contact, with manual reset button.
No address required.
Integrated termination facilities (switches).
Configurable grounding system (direct or capacitive).
IP 20 classification
Increased temperature range
Fig. 2 - ProfiHub connections
Fig. 3 - Long spur lines to instruments and the possibility to remove/insert them during operation. Short circuit protection on each
spur line is automatically provided
Create Fiber Optic backbones
Dynamic spur lines to actuators, flow meters and pH analyzers.
Removable drives and motors.
Pull/Plug motor control centers (drawers).
Roof mounted devices in tank farms.
Barrier for non-galvanic isolated equipment.
Networks with requirement for High Availability/uptime
Large star/tree structured networks.
1.4 Additional benefits
Hot slave insertion and removal during operation.
Short circuit protection on each Channel.
Option to create a redundant path to other supporting Hubs or ComBricks
Compact and robust construction.
Status and error display (per Channel).
Suitable for all DP cables.
Conveniently arranged networks.
Easy extendable installations.
On-board DB9 female connector on each channel for maintenance activities.
Cost Savings
Fig. 4 - Creating a fiber optic backbone increases network reliability and network overview. It is also possible to mix ProfiHubs with
ComBricks
Each copper channel is electrically isolated and internally connected to the transparent intelligent backbone.
The termination is switchable and powered by the ProfiHub. The shielding of the PROFIBUS cable can be
directly grounded or indirectly grounded (see paragraph 1.6).
Fig. 5 - Channel structure
1.6 Grounding System
The ProfiHub B2FO2+ can be grounded by 3 methods:
1) Direct grounding on the Ground Rail
2) Indirect grounding (through a capacitor)
3) Combination of direct and indirect.
The power supply must be grounded directly on the Ground Rail. The shielding of the PROFIBUS cables can be
directly or indirectly grounded. If you do not want to ground all or some cables to the common ground, i.e.
compensating current, the cable shielding must be connected to pin ‘I’ which stands for Indirect grounding. A
capacitor with a parallel high value resistor will separate the 2 potentials (see Fig. 5), ensuring protection of
the signal against non-DC disturbances.
If by accident on 1 channel the Direct Grounding is connected with the Indirect Grounding, the connection to
the Direct Grounding bypasses the capacitor in the Indirect Ground connection. The current on the shield will
flow to Direct Ground.
The red error LEDs will blink shortly if a corrupt message enters the ProfiHub. More specifically, this can be a
Parity error (the parity checksum of the byte is incorrect) or a Framing error (the FCS byte is different than the
real message). It is necessary to investigate further with an oscilloscope to find out what the problem is. This
can easily be done with ProfiTrace.
Another reason for the red error LED is a problem in the redundant cabling (if the ProfiHub is set to redundant).
If the redundant line is fixed, press the ‘Alarm Reset’ button.
It can also be that the baudrate is not locked (no PROFIBUS master on the bus) or the baudrate was set
manually and incorrectly with the rotary switch.
The ProfiHub B2FO2+ can be installed everywhere in a non-hazardous area that complies with IP 20 (DIN 40
050) and the specified temperature range of -25 to +70o Celsius or -13 to +158° Fahrenheit.
2.2 Position
The ProfiHub B2FO2+ can be installed in every position, but it is recommended to install it with the cables
pointing down. In this position it is also easier to read the status LEDs.
2.3 Mounting
The ProfiHub B2FO2+ can be mounted on 35 mm DIN-rail with a minimum width of 130 mm. Mounting
brackets are available for mounting the B2FO2+ directly on a wall.
The supplied rubber studs need to be placed on the back of the housing of the ProfiHub B2FO2+ for extra
fixation. This is to prevent the product to potentially slide off the DIN-rail. See Fig. 9 for an example.
The two 2-pin screw type power connectors are located on the left of the ProfiHub B2FO2+ (Fig. 10).
1 = + (left)
2 = - (right)
Fig. 10 - Power connectors and LEDs
Both power connectors are linked 1-on-1 to the internal power supply of the B2FO2+. If one power supply fails,
the other takes over without delay time. When redundancy is not required, it is sufficient to use one power
connector. Please note that when using only one power supply, a voltage of max. 0.25 V will exist on the other
unconnected power connector, as shown in Fig. 11.
If only one power supply is used, the alarm contact is closed. If two power sources are connected, the contact
is open. As soon as one of the power supplies fails, the contact will close and the Power Indicator LED will blink.
Fig. 11 - Maximum voltage on unconnected Power Connector
The power supply must comply with the following specifications:
Limited Power Source (LPS) or NEC Class 2 or CEC Class 2
Voltage: 12 - 24 VDC
Current: min 275 mA
Wire diameter: < 2.5 mm2
Procedure
To connect the 24V supply to the 2-pin screw-type terminal, proceed as follows:
Strip the insulation from the cable or the conductors for the 24V power supply.
Add cable crimp terminals/wire ferrules to the conductors.
Secure the crimp terminals in the screw-type terminal.
To connect the power supply, you need a 3 mm screwdriver.
If the power is switched on it can be diagnosed by the following indicators:
LEDs should be blinking in a circular animation for a short time.
The POWER LED of the respective power connector (1, 2 or both) is ON.
The READY LED is ON or Blinking, depending on baud rate lock.
2.5 Grounding of the power
It is recommended to use a power supply with a ground lead (3-wire). Connect the ground lead of the
power lead to the Ground Rail of the ProfiHub B2FO2+. Connect the Ground Rail to the common ground with a
separate ground lead. See Fig. 12 for an example.
Fig. 12 - Connection to Ground Rail
2.6 Alarm contact
The ProfiHub B2FO2+ features a potential-free relay contact. This alarm contact can be used to monitor the
power supplies. Example applications are: Connect a LED tower, alarm buzzer, SMS server or use it as a digital
signal for the PLC.
If only one power supply is used, the alarm contact is closed. If two power sources are connected, the contact
is open. As soon as one of the power supplies fails, the contact will close and the Power Indicator LED will blink.
In the case of an interrupted power supply you can reset the contact by pressing the ‘Reset’ button. The
contact will open and the LEDs will stop blinking.
The maximum power to be connected to the alarm contact is 24 VDC. The maximum switching current is 500
mA.
Use the FO channels to create a fiber optic backbone to other ProfiHubs with FO channels or to ComBricks.
Connect the DP copper cable from the master or DCS to one of the two copper channels (Fig. 13).
Fig. 13 - PROFIBUS DP backbone connection
Pin layout of the screw terminals:
Pin “A”: Green wire
Pin “B”: Red wire
Pin “I”: Indirect cable shielding
Note: Connecting the Indirect cable shielding is not required when the ground clips are used.
Testing
If a channel recognizes valid PROFIBUS messages from one or more connected devices, the RXOK LED of the
corresponding channel should be blinking.
2.8 Calculating the delay time
Fiber optic applications require a delay time calculation to adjust the MinTSDR and Slottime (Tslot)
busparameters in the configuration of the master(s). The B2FO2+ complies with the following formulas:
The delay of the module itself is 1.8. This results in the following formula for Tdelay:
Tdelay = (FO cable delay +(2 × Module delay time))× 2
Tdelay = (22.5 +(2 × 1.8)) × 2 = 𝟓𝟐. 𝟐 Tbit
This is the delay between 2 fiber optic interfaces.
Outcome: Make sure the MinTSDR is at least 52.2 bittimes. Change the Max TSDR and Tslot to
appropriate numbers accordingly.
2.9 Spur Segments
Connect the spur segments to the connectors of Channel 1 and 2 (Fig. 14). The second method is to place a
PROFIBUS standardized plug on the DB9 connector of the specific Channel.
Fig. 14 - PROFIBUS DP spur connectors
Pin layout of the screw terminals:
Pin “A”: Green wire
Pin “B”: Red wire
Pin “I”: Indirect cable shielding, for reducing EMC and noise in demanding areas
Note: Connecting the Indirect cable shielding is not required when the ground clips are used.
Testing
If a Channel recognizes valid PROFIBUS messages from one or more connected devices, the RXOK LED of the
Channel should be blinking.
2.10 Termination
The termination of the Channels have been set to ON by default, because it is assumed that the new segment is
started at the ProfiHub (Fig. 15).
The termination LED of the corresponding Channel is activated when the termination switch is set to ON.
When the DB9 connector is used and the cable starts at the ProfiHub, it is recommended to use the
termination on the DB9 plug and NOT the ProfiHub. This way, the connector can be removed while maintaining
termination on the bus.
2.11 Baudrate switch
The ProfiHub B2FO2+ recognizes the transmission speed by default. If it is required that the ProfiHub B2FO2+ is
locked to a certain transmission speed, the baudrate switch should be set to the required value (Fig. 16).
0 = Normal repeating, Auto detect (default)
1 = 9.6 kbps
2 = 19.2 kbps
3 = 45.45 kbps
4 = 93.75 kbps
5 = 187.5 kbps
6 = 500 kbps
7 = 1500 kbps
8 = 3000 kbps
9 = 6000 kbps
A = 12000 kbps
B = Robust repeating, Auto detect
C = Robust repeating, redundancy on copper channel 1 and 2
D .. F = Reserved for future use
Please note that the position of the rotary switch is only sampled during start-up. Changing the position of the
switch will not have effect during operation.
The auto baudrate detect feature will search for the correct baud rate within 10 seconds of receiving the first
telegram. This baud rate lock will be lost after 50 seconds of incorrect or no message reception.
2.12 Robust Repeating mode
The B2FO2+ has two repeating modes: normal (default) and Robust Repeating (rotary switch setting B or C). In
normal mode the bits are transferred directly on the other channel with a minimal delay (see Delay Times in
the Technical Data chapter). In Robust mode, the first byte is checked to verify if the following bits are a real
PROFIBUS message. If the byte is illegal, the message will not be transferred to the other channel. This helps
network stability in EMC sensitive environments.
ATTENTION:
Using the ProfiHub B2FO2+ in Robust Repeating mode causes a delay in processing the telegrams. It is required
to increase the default MinTSDR in the PLC busparameters slightly. Recommended is to increase the MinTSDR
with a value according to the Delay Time table, column ‘Robust Mode’, described in the Technical Data chapter.
Generally a MinTSDR of 25 is sufficient. If long fiber optic cables or many optical link modules (OLMs) are used,
check paragraph 2.8 for an example of the MinTSDR calculation.
2.13 Channel Redundancy
To use the Redundancy option of the B2FO2+, set the rotary switch to the ‘C’ position. This enables the two
copper channels (1 and 2) to be one redundant path to another B2FO2+, a B2+, to a redundant ComBricks, or
to any other supporting product. See Fig. 17 for an example.
Fig. 17 - Redundant path between multiple ProfiHubs
The telegrams are transferred onto both redundant channels. The logic inside the ProfiHub determines which
telegram is used to be transferred onto the other channels. A message received by a redundant channel is
repeated on all other channels, except the other redundant channel. A message received by a normal channel
is repeated on all other channels.
When one redundant cable breaks, the other cable ensures safe delivery of the telegram. In this event the
built-in alarm contact will close. The red ‘ERROR’ LED will blink with an interval of 100ms. When the redundant
path is fixed, press the ‘ALARM RESET’ pushbutton to reset the alarm.
ATTENTION:
Using the ProfiHub B2FO2+ in Redundancy mode causes a delay in processing the telegrams. It is required to
increase the default MinTSDR in the PLC busparameters slightly. Recommended is to increase the MinTSDR
with a value according to the Delay Time table, column ‘Robust Mode’, described in the Technical Data chapter.
Generally a MinTSDR of 25 is sufficient. If long fiber optic cables or many optical link modules (OLMs) are used,
check paragraph 2.8 for an example of the MinTSDR calculation.
IRELAND
PROFIBUS Ireland T: +353-61-202107 or +35361240240
Automation Research Centre F: +353-61-202582
University of Limerick E: info@profibus.ie
National Technology Park, Plassey I: www.profibus.ie
Limerick
Ireland
ISRAEL
Instrumetrics Industrial Control T: +972-9-8357090
8 Hamlacha St. F: +972-9-8350619
New Industrial Zone E: info@instrumetrics-ic.co.il
Netanya, 42170 I: www.inst-ic.co.il
Israel
ITALY
PROCENTEC Italy T: +39 030 200 8610
Via Branze n. 43/45 F: +39 030 238 0059
25123 Brescia E: www.procentec.it
Italy W: www.procentec.it
Genoa FIELDBUS Competence Centre Srl T: +39 010 86 02 580
Via Greto di Cornigliano, 6R/38 F: +39 010 65 63 233
16152 Genova E: procentec@gfcc.it
Italy W: www.gfcc.it
JAPAN
TJ Group T: +81-3-6450-3739
C/O Japanese PROFIBUS Organisation F: +81-3-6450-3739
West World Building 4F E: info@profibus.jp
3-1-6 Higashi-Gotanda,
Shinagawa-ku,
Tokyo, 141-0022
Japan
KOREA
Hi-PRO Tech. Co., Ltd. T: +82 82-31-216-2640
SAUDI ARABIA
ASM Process Automation T: +966 2 691 2741
Al-Zahra Dist. – Attas st. F: +966 2 682 8943
cross section with helmy Kutby St. E: info@asmestablishment.com
Villa no.25 I: www.asmestablishment.com
Jeddah-21553
Saudi Arabia
SINGAPORE / SOUTH EAST ASIA
Allegro Electronics T: +65 62878063
Unique number of a device connected to the network. With PROFIBUS this can
be 0 to 126. 127 is a broadcast address.
Analyzer
Software tool to observe the protocol traffic. Combi-Analyzers can also inspect
the signal quality.
Other term: Bus Monitor.
Example: ProfiTrace.
Backbone
The primary bus cable. Most of the time only the control systems, ProfiHubs and
fiber optic couplers are connected to this cable. The field devices are connected
behind the ProfiHubs and fiber optic couplers.
Bit Time (Tbit)
The bit time Tbit is the time, which elapses during the transmission of one bit. It
depends on the baudrate and is calculated as follows Tbit = 1 (bit) / baudrate
(bps).
Examples:
12 Mbps --> Tbit = 83 ns
1.5 Mbps --> Tbit = 667 ns
Busparameters
Settings that define the timing behaviour on the bus. They are defined in the
master. Examples: Tslot, MaxTSDR.
C
Capacitance.
DGND
Digital Ground.
DIN
German Institute for Standardization (www.din.de).
DP-V0
DP-V0 is the basic stage of the PROFIBUS DP communication protocol. DP-V0
devices (master and slaves) perform the following basic functionalities:
- Cyclic exchange of I/O data between controlling and slave devices
- Device, Identifier (module) and Channel related Diagnosis
- Parameterization of DP-slaves
- Configuration of DP-slaves
DP-V1
DP-V1 is the first stage of extension of PROFIBUS DP after DP-V0. DP-V1 devices
shall comply with the following features:
- Device related diagnosis is replaced by status and alarms.
- The first three octets of the user parameterization data are now standardized
DP-V2 is the second stage of extension of PROFIBUS DP after DP-V1. DP-V2
devices shall comply with the following features:
- Data Exchange Broadcast (DxB) for slave to slave communication
(publisher/subscriber principle).
- Isochronous Mode (time tick synchronized operating slaves, e.g. drives)
- Up- and/or download of Load Region Data (domains)
- Clock Control (synchronization within slaves) and Time Stamping
- Redundancy.
Electromagnetic
Compatibility
See EMC.
EMC
The extent to which an electric or electronic device will tolerate electrical
interference from other equipment (immunity), and will interfere with other
equipment. Within the European Community as well as in other countries it is
regulated by law that electric and electronic components and equipment comply
with basic standards such as IEC 61000-6-2 or IEC 61326 or corresponding
individual product standards.
Hub
A Hub refreshes a signal and passes the information on to all nodes which are
connected to the Hub. Data frames which were received on one port are
transferred to all the other ports (chicken foot topology).
MPI
Multiple Protocol Interface. Protocol defined by Siemens which uses the layer 1
and 2 of PROFIBUS (FDL).
PCB
Printed Circuit Board.
PROFIBUS DP
Acronym for "PROFIBUS for Decentralized Peripherals". Specification of an open
fieldbus system with the following characteristics:
- Flying masters with robin round token passing coordination (MM)
- Connection based (MS1) and connectionless (MS2, MS3) acyclic communication
between masters and slaves
Options (e.g.):
- Data exchange broadcast (DXB), i.e. slave to slaves communication
- Isochronous mode of slaves
- Clock synchronization
- Redundancy
PROFIBUS DP is standardized within IEC 61158 and IEC 61784, communication
profile families 3/1 and 3/2
The term "PROFIBUS DP" also is a synonym for the RS485 based deployments
within factory automation.
Repeater
Active physical layer device that receives and retransmits all signals over a
different port to increase the distance and number of devices for which signals
can be correctly transferred for a given medium.
Spur line
A cable attached to a bus segment with a T-connection . Spurs are not
recommended with PROFIBUS DP. They are prohibited with 12 Mbps and
PROFIsafe operations. German term is "Stichleitung".
PROCENTEC is a specialist in PROFIBUS and PROFINET technology and develops products to optimize the
production processes of end users. Our innovative solutions ensure that our customers successfully operate
in the world of industrial automation and enjoy maximum results from their processes.
PROCENTEC globally supplies all the components required to install a measurable and controllable network.
Our products measure, signal and connect the various elements of a process installation and ensure it runs
optimally. We develop and produce all products in the Netherlands and export them through our worldwide
distribution network. PROCENTEC also is the international accredited Competence and Training center for
PROFIBUS and PROFINET. We provide training courses that help employees using those techniques optimally
for their business objectives. In addition we also provide the necessary support to end users during their
implementation procedures, certification processes, audits and malfunctions.
We are of the opinion that the industrial markets need the confidence of believing in the reliable PROFIBUS /
PROFINET technology and applications, to ensure their processes are not threatened in any way and the
continuity remains guaranteed. In view of the possible negative consequences and impact in that industry, we
therefore think that those companies have the right to the best solutions and honest expert advice. Based on
that belief, PROCENTEC continues to innovate and develop, which makes us the most reliable service provider
and knowledge partner for our customers. We do all of this with total dedication.
We believe that it is important to communicate with our customers, partners, distributors and suppliers in a
transparent and decent way. We are empathic, truly interested and passionate in everything we do. Quality,
continuity, service and sustainability are essential to us. That enables us to provide our customers with
groundbreaking and tailor-made solutions.
Products Training courses Services
• ProfiTrace • PROFIBUS training courses • Competence center
• ComBricks • PROFINET training courses • Support & Consultancy