Siemens SIMATIC NET PG PROFIBUS, SIMATIC NET PC PROFIBUS Operating Instructions Manual
PROFIBUS Optical Bus Terminal
(OBT)
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SIMATIC NET
PG/PC - PROFIBUS
PROFIBUS Optical Bus Terminal
(OBT)
Operating Instructions
04/2016
C79000
Introduction
1
Components of the product
2
Functional description
3
Network topology
4
Commissioning
5
Help with problems during
operation
6
Technical data
7
Approvals and certificates
8
-G8976-C122-07
Siemens AG
Division Process Industries and Drives
Postfach 48 48
90026 NÜRNBERG
GERMANY
Document order number: C79000-G8976-C122
Ⓟ
Copyright © Siemens AG 2009 - 2016.
All rights reserved
Legal information
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indicates that property damage can result if proper precautions are not taken.
Qualified Personnel
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Proper use of Siemens products
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
re required to ensure that the products operate safely and without any problems. The permissible
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damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
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The product/system described in this documentation may be operated only by
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
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avoiding potential hazards when working with these products/systems.
Note the following:
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance a
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We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
for the specific
04/2016 Subject to change
Table of contents
1 Introduction ............................................................................................................................................. 5
2 Components of the product ..................................................................................................................... 7
3 Functional description ............................................................................................................................. 9
4 Network topology .................................................................................................................................. 13
5 Commissioning ..................................................................................................................................... 17
6 Help with problems during operation ..................................................................................................... 27
7 Technical data ...................................................................................................................................... 29
8 Approvals and certificates ..................................................................................................................... 33
3.1 Interfaces .................................................................................................................................. 9
3.2 Opto-electrical signal conversion and signal regeneration ....................................................... 9
3.3 Supported FO fiber types ........................................................................................................ 10
3.4 Displays .................................................................................................................................. 10
3.5 Operator controls .................................................................................................................... 12
4.1 Optical bus .............................................................................................................................. 13
4.2 Integration of long FO cable runs ........................................................................................... 14
4.3 Integrating RS-485 segments ................................................................................................. 15
5.1 Procedure for commissioning ................................................................................................. 20
5.2 Installation ............................................................................................................................... 20
6.1 Help with problems during operation ...................................................................................... 27
8.1 Notes on the CE mark............................................................................................................. 33
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 04/2016, C79000-G8976-C122-07
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Table of contents
PROFIBUS Optical Bus Terminal (OBT)
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1
The PROFIBUS OBT (Optical Bus Terminal) it is a network component used in optical
PROFIBUS DP fieldbus networks. It allows the connection of either a single device without
an integrated optical interface or an RS-485 segment to the optical PROFIBUS DP. The
following figure shows an example of a configuration.
Image 1-1 Example of an optical PROFIBUS DP configuration
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 04/2016, C79000-G8976-C122-07
5
Introduction
Connections
Sensitivity
Power supply
Operating state
Mechanical construction
The connection between the individual bus nodes takes the form of an optical bus with twofiber plastic fiber-optic cables (plastic fiber-optic cables are also known as POF, Polymer
Optical Fiber) or PCF fiber-optic cables (PCF = Polymer Cladded Fiber, synonymous with
HCS1 fiber-optic cable). Since fiber-optic cables (FO cable) are completely insensitive to
EMC interference, complex grounding concepts and protection measures are unnecessary.
This also applies to the laying of a equipotential bonding cables. Due to be opto-electronic
conversion, there is automatically electrical isolation so that potential differences as can
occur in extensive plants are no longer noticed.
1) HCS is a registered trademark of Spectran Speciality Optics and stands for "Hard Polymer
Cladded Silica Fiber".
Just as the FO cable is insensitive to EMC interference, an FO cable also emits no
electromagnetic waves into its environment. Sensitive electronic devices located in the
vicinity of the fiber-optic cable therefore need no additional protection or suppression
measures.
The OBT requires an operating power supply of 24 VDC that is connected via two screw
terminals.
LEDs signal the current operating state and any problems affecting operation.
The mechanical construction consists of a compact plastic housing that can be mounted
either on a DIN rail or any flat surface.
PROFIBUS Optical Bus Terminal (OBT)
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Supplied
Not supplied
● 1 x PROFIBUS OBT
● 1 x Operating instructions (Compact) A5E03345735-01
● Plastic fiber-optic cables, sold in meters
● Assembly tool for fiber-optic cable connectors
● Operating Instructions for the PROFIBUS OBT
● Fiber-optic cable connectors
PROFIBUS Optical Bus Terminal (OBT)
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Components of the product
PROFIBUS Optical Bus Terminal (OBT)
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3
3.1
Interfaces
3.2
Opto-electrical signal conversion and signal regeneration
The OBT is a repeater with 3 channels.
The OBT has the following interfaces for connection of PROFIBUS DP segments:
● Channel 1 (CH1) is an electrical RS-485 interface. It is designed as a 9-pin D-sub female
connector. A PROFIBUS DP node or a PC, PG, OP or an RS-485 segment can be
connected to the OBT via this channel. The copper segment should be kept as short as
possible since this can couple in disturbances into the optical PROFIBUS DP.
● Channel 2 (CH2) and channel 3 (CH3) are optical interfaces. These are designed as
duplex female connectors. The end a two-fiber plastic or PCF fiber-optic cable fitted with
two simplex male connectors is connected to each of these duplex female connectors.
The OBT also has a 3-pin terminal for connection of the 24 V power supply and, if
necessary, a ground cable.
The OBT converts the RS-485 level received at channel 1 into an optical signal level that is
output via channels 2 and channel 3.
Signals received at channel 2 or 3 are converted to electrical signals and
● output on channel 1 as an electrical signal
● they are then converted into an optical signal again and output on the other optical
channel.
There is no echo on the receive channel; in other words, received signals are not sent back
on the same channel.
The OBT regenerates the signals in amplitude and time. This makes it possible to cascade
up to 126 modules in an optical bus. The cascading depth is simply limited by the monitoring
times of the connected devices.
The latency per OBT is 6 bit times.
PROFIBUS Optical Bus Terminal (OBT)
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Functional description
3.3
Supported FO fiber types
Fiber type
Link length between 2 devices
and max. max. 200 dB/km cable attenuation
3.4
Displays
L+ 24 V (green)
not lit:
Power supply missing or internal power supply is defective or short
circuited
flashes:
Power supply present, transmission speed not yet set
lit green:
Transmission speed set, power supply functioning correctly
3.3 Supported FO fiber types
The OBT supports the fiber types listed in the following table:
Table 3- 1 Achievable FO cable distance between the two devices on optical PROFIBUS DP
Plastic FO cable 980/1000 μm with 2 fibers
PCF FO cable 200/230 μm with 2 fibers and
max. max. 10 dB/km cable attenuation
The specified link length between the devices assumes that the partner devices use the
same optical components as the OBT. This is, for example, the case with the IM 153–2 FO
and IM 467 FO.
The transmission speed is not dependent on the fiber type used or the cable length. This can
be up to 12 Mbps.
The following accessories are available:
● Plastic fiber-optic cable (sold in meters), connectors/polishing set and the assembly tool
for plastic fiber-optic cable
The plastic fiber-optic cables do not have connectors fitted. The plastic simplex
connectors can be fitted easily on site with the available tools.
● PCF FO cable (preassembled)
PCF cables with 4 PCF simplex connectors fitted are available in fixed lengths.
0.1 to 50 meters
0 to 300 meters
The OBT has 4 LEDs to display the operating state.
PROFIBUS Optical Bus Terminal (OBT)
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Functional description
CH1, CH2 , CH3 (channel 1 to 3, yellow)
not lit:
Data is not being received
lit yellow:
Data is being received
3.4 Displays
PROFIBUS Optical Bus Terminal (OBT)
Operating Instructions, 04/2016, C79000-G8976-C122-07
Image 3-1 LEDs on the front panel
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