Siemens SIMATIC NET PG PROFIBUS Bedienungsanleitung

PROFIBUS Optical Bus Terminal

(OBT)

___________________

SIMATIC NET

PG/PC - PROFIBUS

PROFIBUS Optical Bus Terminal

(OBT)

Operating Instructions

04/2016

C79000

-G8976-C122-07

Introduction

Components of the product

Functional description

Network topology

Commissioning

Help with problems during

operation

Technical data

Approvals and certificates

Siemens AG

Division Process Industries and Drives

Postfach 48 48

90026 NÜRNBERG

GERMANY

Document order number: C79000-G8976-C122

Ⓟ

04/2016 Subject to change

Legal information

Warning notice system

This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent

damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert

symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are

graded according to the degree of danger.

DANGER

indicates that death or severe personal injury will result if proper precautions are not taken.

WARNING

indicates that death or severe personal injury may result if proper precautions are not taken.

CAUTION

indicates that minor personal injury can result if proper precautions are not taken.

NOTICE

indicates that property damage can result if proper precautions are not taken.

If more than one degree of danger is present, the warning notice representing the highest degree of danger will

be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to

property damage.

Qualified Personnel

The product/system described in this documentation may be operated only by

personnel qualified

for the specific

task in accordance with the relevant documentation, in particular its warning notices and safety instructions.

Qualified personnel are those who, based on their training and experience, are capable of identifying risks and

avoiding potential hazards when working with these products/systems.

Proper use of Siemens products

Note the following:

WARNING

Siemens products may only be used for the applications described in the catalog and in the relevant technical

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

re required to ensure that the products operate safely and without any problems. The permissible

ambient conditions must be complied with. The information in the relevant documentation must be observed.

Trademarks

All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication

may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.

Disclaimer of Liability

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.

PROFIBUS Optical Bus Terminal (OBT)

Operating Instructions, 04/2016, C79000-G8976-C122-07 3

Table of contents

1 Introduction............................................................................................................................................. 5

2 Components of the product ..................................................................................................................... 7

3 Functional description ............................................................................................................................. 9

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 Network topology .................................................................................................................................. 13

4.1 Optical bus ..............................................................................................................................13

4.2 Integration of long FO cable runs ...........................................................................................14

4.3 Integrating RS-485 segments .................................................................................................15

5 Commissioning ..................................................................................................................................... 17

5.1 Procedure for commissioning .................................................................................................20

5.2 Installation...............................................................................................................................20

6 Help with problems during operation ..................................................................................................... 27

6.1 Help with problems during operation ......................................................................................27

7 Technical data ...................................................................................................................................... 29

8 Approvals and certificates ..................................................................................................................... 33

8.1 Notes on the CE mark.............................................................................................................33

Table of contents

PROFIBUS Optical Bus Terminal (OBT)

4Operating Instructions, 04/2016, C79000-G8976-C122-07

PROFIBUS Optical Bus Terminal (OBT)

Operating Instructions, 04/2016, C79000-G8976-C122-07 5

Introduction

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

Introduction

PROFIBUS Optical Bus Terminal (OBT)

6Operating Instructions, 04/2016, C79000-G8976-C122-07

Connections

The connection between the individual bus nodes takes the form of an optical bus with two-

fiber 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".

Sensitivity

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.

Power supply

The OBT requires an operating power supply of 24 VDC that is connected via two screw

terminals.

Operating state

LEDs signal the current operating state and any problems affecting operation.

Mechanical construction

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)

Operating Instructions, 04/2016, C79000-G8976-C122-07 7

Components of the product

Supplied

●1 x PROFIBUS OBT

●1 x Operating instructions (Compact) A5E03345735-01

Not supplied

●Plastic fiber-optic cables, sold in meters

●Assembly tool for fiber-optic cable connectors

●Operating Instructions for the PROFIBUS OBT

●Fiber-optic cable connectors

Components of the product

PROFIBUS Optical Bus Terminal (OBT)

8Operating Instructions, 04/2016, C79000-G8976-C122-07

PROFIBUS Optical Bus Terminal (OBT)

Operating Instructions, 04/2016, C79000-G8976-C122-07 9

Functional description

The OBT is a repeater with 3 channels.

3.1

Interfaces

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.

3.2

Opto-electrical signal conversion and signal regeneration

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.

Functional description

3.3 Supported FO fiber types

PROFIBUS Optical Bus Terminal (OBT)

10 Operating Instructions, 04/2016, C79000-G8976-C122-07

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

Fiber type

Link length between 2 devices

Plastic FO cable 980/1000 μm with 2 fibers

and max. max. 200 dB/km cable attenuation

0.1 to 50 meters

PCF FO cable 200/230 μm with 2 fibers and

max. max. 10 dB/km cable attenuation

0 to 300 meters

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.

3.4

Displays

The OBT has 4 LEDs to display the operating state.

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

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