OBT_HB_E.PDF

Contents

SIMATIC NET

Introduction

The SIMATIC NET PROFIBUS

OBT Product

PROFIBUS Optical Bus

Terminal (OBT)

Functional Description

Network Topology

Installation and Startup

Manual

Troubleshooting

Technical Specifications

Notes on the CE Label

References

Abbreviations

C79000-G8976-C122-01

Release 1

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

triangle and are marked as follows according to the level of danger:

Danger

indicates that death, severe personal injury or substantial property damage will result if proper

precautions are not taken.

Warning

indicates that death, severe personal injury or substantial property damage can result if proper

precautions are not taken.

Caution

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

Note

draws your attention to particularly important information on the product, handling the product, or to a

particular part of the documentation.

Qualified Personnel

Only qualified personnel should be allowed to install and work on this equipment Qualified persons are

defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and sy-

stems in accordance with established safety practices and standards.

Correct Usage

Note the following:

Warning

This device and its components may only be used for the applications described in the catalog or the

technical description, and only in connection with devices or components from other manufacturers which

have been approved or recommended by Siemens.

This product can only function correctly and safely if it is transported, stored, set up, and installed cor-

rectly, and operated and maintained as recommended.

Trademarks

SIMATIC , SIMATIC HMI and SIMATIC NET are registered trademarks of SIEMENS AG.

Third parties using for their own purposes any other names in this document which refer to trademarks

might infringe upon the rights of the trademark owners.

The reproduction, transmission or use of this document or its contents is not

permitted without express written authority. Offenders will be liable for

damages. All rights, including rights created by patent grant or registration of

a utility model or design, are reserved.

Disclaimer of Liability

We have checked the contents of this manual for agreement with the hard-

ware and software described. Since deviations cannot be precluded entirely,

we cannot guarantee full agreement. However, the data in this manual are

reviewed regularly and any necessary corrections included in subsequent

editions. Suggestions for improvement are welcomed.

Siemens AG

Bereich Automatisierungstechnik

Geschäftsgebiet Industrie-Automatisierung

Postfach 4848, D-90327 Nürnberg

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-01

Index-2

Siemens Aktiengesellschaft

Order no. C79000–G8976–C122

Siemens AG 1998

Subject to technical change.

Contents

Introduction

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

The SIMATIC NET PROFIBUS OBT Product

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-1

Functional Description

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.1

Interfaces

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-1

3.2

Optoelectric Signal Conversion and Signal Regeneration

. . . . . . . . . . . . . .

3-1

3.3

Automatic Transmission Rate Detection

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.4

Supported FO Fiber Types

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.5

Displays

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2

3.6

Operator Controls

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-4

Network Topology

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.1

Optical Bus

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1

4.2

Using Long Fiber Optic Sections

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-2

4.3

Attaching RS-485 Segments

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3

Installation and Startup

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-1

5.1

Precedure for Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2

5.2

Installation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3

Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6-1

Technical Specifications

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-1

Notes on the CE Label

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8-1

References

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9-1

Abbreviations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10-1

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-01

Introduction

The PROFIBUS OBT (Optical Bus Terminal) is a network component for use in

optical PROFIBUS DP fieldbus networks. It allows the attachment of a single

device without an integrated optical interface to the optical PROFIBUS DP. The

following figure illustrates a typical configuration.

Programming Device

Operator Panel

SIMATIC S7-400

with IM 467 FO

RT 200M with

FO interface

DP node without

FO interface

OBT

1) PROFIBUS cable (terminated at both ends)

2) Plastic FO cable or PCF FO cable with two fibers

Figure 1-1

Example of an Optical PROFIBUS DP Configuration

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-01

1-1

Introduction

Connections

1) fiber-optic cable). Since fiber-optic cables are

completely insensitive to electromagnetic disturbance, no grounding concept

whatsoever is necessary. For the same reason, equipotential bonding is also not

necessary. The optoelectronic conversion provides automatic isolation so that

differences in potential as can occur in extensive systems have no effect.

1) HCS is a registered trademark of Ensign-Bickford Optics

Company and stands for “Hard Polymer Cladded Silica Fiber”.

Sensitivity

Just as fiber-optic cable is insensitive to electromagnetic noise, a fiber-optic cable

emits no electromagnetic noise into the environment. Sensitive electronic devices

close to the fiber-optic cable therefore need no additional protection or noise

suppression.

Power Supply

The OBT requires an operating power supply of 24 V direct voltage that is

connected via two terminal screws.

Operating Mode

LEDs signal the current mode and any problems in operation.

Mechanical Design

The optical bus terminal consists of a compact plastic casing which can be

installed either on a standard rail or on any flat surface.

1-2

PROFIBUS Optical Bus Terminal (OBT)

C79000-G8976-C122-01

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

two-fiber plastic FO cables (plastic fiber-optic cables are also known as POF,

Polymer Optical Fiber) or PCF FO cables (PCF = Polymer Cladded Fiber,

corresponds to HCS

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