Omron PROFIBUS DP GATEWAY User manual

Cat. No. W01E-EN-01 Note: Specifications subject to change without notice.
PRT1-SCU11 PROFIBUS-DP Gateway to Host Link/Compoway-F OPERATION MANUALCat. No. W01E-EN-01
OPERATION MANUAL
PROFIBUS-DP Gateway
to Host Link/Compoway-F
PRT1-SCU11
Cat. No. W01E-EN-02
Authorised Distributor:
Printed in Europe
W01E-EN-01_PROFIBUS.qxd 29.11.2004 11:58 Seite 1

PRT1-SCU11
PROFIBUS DP Gateway
Operation Manual
Revised September 19, 2005

iv

v
Notice:
OMRON products are manufactured for use by a trained operator and only for the purposes described
in this manual.
The following conventions are used to classify and explain the precautions in this manual. Always
heed the information provided with them.
!DANGER Indicates information that, if not heeded, is likely to result in serious injury or loss of life.
!WARNING Indicates information that, if not heeded, could possibly result in serious injury or loss of
life.
!Caution Indicates information that, if not heeded, could possibly result in minor or relatively serious
injury, damage to the product or faulty operation.
OMRON Product References
All OMRON products are capitalized in this manual. The first letter of the word Unit is also capitalized
when it refers to an OMRON product, regardless of whether it appears in the proper name of the prod-
uct.
The abbreviation
Ch appears in some displays and on some OMRON products. It often means word
and is abbreviated as Wd in the documentation.
The abbreviation
PLC means Programmable Logic Controller.
Visual Aids
The following headings appear in the left column of the manual to help you locate different types of
information.
Note Indicates information of particular interest for efficient and convenient opera-
tion of the product.
1, 2, 3...Indicates various lists such as procedures, checklists etc.

vi
Trademarks and Copyrights
PROFIBUS, PROFIBUS FMS, PROFIBUS DP, and PROFIBUS PA are trademarks of PROFIBUS
International.
Microsoft, Windows, Windows NT, Windows 2000, Windows XP, Windows Explorer and ActiveX are
trademarks of Microsoft Corporation.
Other product names and company names in this manual are trademarks or registered trademarks of
their respective companies.
The copyright of the PRT1-SCU11 PROFIBUS DP Gateway belongs to OMRON Corporation.
OMRON, 2005
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, o
r
by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission o
f
OMRON.
No patent liability is assumed with respect to the use of the information contained herein. Moreover, because OMRON is con-
stantly striving to improve its high-quality products, the information contained in this manual is subject to change without
notice. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON assumes no responsibility
for errors or omissions. Neither is any liability assumed for damages resulting from the use of the information contained in
this publication.

vii
TABLE OF CONTENTS
About this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
2 General Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
5 Application Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xiii
6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
SECTION 1
Features and Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1 Overview of PROFIBUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-2 PROFIBUS DP Network configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1-3 PROFIBUS DP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-4 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
SECTION 2
Installation and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2-1 Unit Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2-2 Installing the PRT1-SCU11 PROFIBUS DP Gateway . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2-3 Wiring the RS-422A / RS-485 Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2-4 Initial Setup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2-5 Setting up a PROFIBUS Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2-6 Configuring the PROFIBUS DP network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
SECTION 3
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3-1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3-2 PROFIBUS Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3-3 Compoway-F Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
3-4 K-Format Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
3-5 Host Link Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
3-6 Memobus Communication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3-7 PROFIBUS Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
3-8 Auxiliary RS-232C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

viii
TABLE OF CONTENTS
SECTION 4
Troubleshooting and Maintenance . . . . . . . . . . . . . . . . . . . . 57
4-1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4-2 Troubleshooting Using LED Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
4-3 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
4-4 Replacing the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Appendices
A Memory Mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
B Function Block Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

ix
About this Manual
This manual describes the PRT1-SCU11 PROFIBUS DP Gateway, how to install it and how and oper-
ate the Unit. The Unit version number on the side case of the housing indicates supported functional-
ity. If no version number is shown, the version number is 1.0. The following table lists the functions
supported per version number.
Unit version 2.0 includes the same functions as Unit version 1.0, in addition to new protocols sup-
ported. Unit version 2.0 will eventually replace Unit version 1.0.
Note This manual describes the features and functions of Unit version 2.0.
Please read this manual carefully so that you understand the information provided before installing or
using the PRT1-SCU11 PROFIBUS DP Gateway. Start with the precautions in the following section.
They describe the operating environment and application safety measures which must be observed
prior to and when using the PRT1-SCU11 PROFIBUS DP Gateway.
The sections of this manual are as follows:
Section 1 introduces the PRT1-SCU11 PROFIBUS DP Gateway.
Section 2 describes the installation and setup of the PRT1-SCU11 PROFIBUS DP Gateway.
Section 3 describes operational aspects of the PRT1-SCU11 PROFIBUS DP Gateway.
Section 4 provides procedures for troubleshooting the PRT1-SCU11 PROFIBUS DP Gateway.
The
Appendices contain information supplementary to the information in the main body of the man-
ual. They are referred to in the various sections as required.
Unit name Unit Version Protocols supported
PRT1-SCU11 1.0 Compoway-F
Host Link
2.0 Compoway-F
Host Link
K-Format protocol
Memobus
Manual Products Contents Cat. No.
CS/CJ Series PROFIBUS DP
Master Units
Operation Manual
SYSMAC CS1/CJ1W-PRM21 Describes the Installation and Opera-
tion of the CS1/CJ1W-PRM21 PROFI-
BUS DP Master Units and CX-Profibus
Configurator.
W409-E2-
@
E5GN Temperature Controller
User manual
E5GN Temperature Controller Describes the Installation and Opera-
tion of the E5GN Temperature Control-
ler.
H101-E1-
@
E5EN Temperature Controller
User manual
E5EN Temperature Controller Describes the Installation and Opera-
tion of the E5EN Temperature Control-
ler.
H111-E1-
@
E5AN Temperature Controller
User manual
E5AN Temperature Controller Describes the Installation and Opera-
tion of the E5AN Temperature Control-
ler.
H112-E1-
@
E5CN Temperature Controller
User manual
E5CN Temperature Controller Describes the Installation and Opera-
tion of the E5CN Digital Temperature
Controller.
H129-E1-
@

x
E5 @ N Communication Func-
tions User manual
E5AN/E5EN/E5CN/E5GN Tem-
perature Controllers
Describes the Compoway-F Communi-
cation Functions for the E5AN/E5EN/
E5CN/E5GN Temperature Controllers.
H102-E1-
@
H130-E1- @
E5ZN Temperature Controller
User manual
E5ZN Temperature Controller Describes the Installation and Opera-
tion of the E5ZN Temperature Control-
ler.
H113-E1-
@
E5AR/E5ER Digital Controller
Users Manual
E5AR/E5ER Digital Controller Describes the Installation and Opera-
tion of the E5AR/E5ER Digital Control-
lers.
Z182-E1-
@
E5 @ K Communication Func-
tions User manual
E5AK/E5EK Process Controllers Describes the Installation and Opera-
tion of the E5AK/E5EK Intelligent Digi-
tal Controller.
H083-E1-
@
H085-E1- @
R88A-MCW151-E / R88A-
MCW151-DRT-E Motion Con-
trol Option Board Operation
Manual
R88A-MCW151-E / R88A-
MCW151-DRT-E Motion Control
Option Board
Describes the Installation and Opera-
tion of the R88A-MCW151-E / R88A-
MCW151-DRT-E Motion Control
Option Board.
I203-E2-
@
VARISPEED F7
Vector Control Frequency
Inverter User’s Manual
OMRON-Yaskawa VARISPEED
F7 Inverter
Describes the Installation and Opera-
tion of the OMRON-Yaskawa
VARISPEED F7 Inverter.
YEG-TOE-
S616-55.1-
OY
Manual Products Contents Cat. No.
!WARNING Failure to read and understand the information provided in this manual may result in per-
sonal injury or death, damage to the product, or product failure. Please read each section
in its entirety and be sure you understand the information provided in the section and
related sections before attempting any of the procedures or operations given.

xi
PRECAUTIONS
This section provides general precautions for using the PRT1-SCU11 PROFIBUS DP Gateway modules, Programmable
Controllers and related devices.
The information contained in this section is important for the safe and reliable operation of the PRT1-SCU11
PROFIBUS DP Gateway. You must read this section and understand the information contained before attempting
to set up or operate a PROFIBUS DP Gateway system.
1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xii
4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii
6 Conformance to EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
6-1 Applicable Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
6-2 Concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv
6-3 Conformance to EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . xv

xii
Intended Audience 1
1 Intended Audience
This manual is intended for the following personnel, who must also have a
knowledge of electrical systems (an electrical engineer or the equivalent).
• Personnel in charge of installing FA systems.
• Personnel in charge of designing FA systems.
• Personnel in charge of managing FA systems and facilities.
2 General Precautions
The user must operate the product according to the performance specifica-
tions described in the operation manuals.
Before using the product under conditions which are not described in the
manual or applying the product to nuclear control systems, railroad systems,
aviation systems, vehicles, combustion systems, medical equipment, amuse-
ment machines, safety equipment, and other systems, machines, and equip-
ment that may have a serious influence on lives and property if used
improperly, consult your OMRON representative.
Make sure that the ratings and performance characteristics of the product are
sufficient for the systems, machines, and equipment, and be sure to provide
the systems, machines, and equipment with double safety mechanisms.
This manual provides information for programming and operating OMRON
PROFIBUS DP Gateway. Be sure to read this manual before attempting to
use the Unit and keep this manual close at hand for reference during opera-
tion.
!WARNING It is extremely important that the Unit is used for its specified purpose and
under the specified conditions, especially in applications that can directly or
indirectly affect human life. You must consult your OMRON representative
before using it in a system in the above-mentioned applications.
3 Safety Precautions
!WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing
so may result in electric shock.
!WARNING Never touch any of the terminals while power is being supplied. Doing so may
result in serious electrical shock or electrocution.
!WARNING Do not attempt to disassemble, repair, or modify any of the Units. Any attempt
to do so may result in malfunction, fire, or electric shock.

xiii
Operating Environment Precautions 4
4 Operating Environment Precautions
!Caution Do not operate the Unit in the following places:
• Locations subject to direct sunlight.
• Locations subject to temperatures or humidities outside the range speci-
fied in the specifications.
• Locations subject to condensation as the result of severe changes in tem-
perature.
• Locations subject to corrosive or flammable gases.
• Locations subject to dust (especially iron dust) or salt.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to shock or vibration.
Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
• Locations near to power supply lines.
!Caution The operating environment of the PROFIBUS DP Gateway can have a large
effect on the longevity and reliability of the system. Unsuitable operating envi-
ronments can lead to malfunction, failure and other unforeseeable problems
with the system. Ensure that the operating environment is within the specified
conditions at installation time and remains that way during the life of the sys-
tem. Follow all installation instructions and precautions provided in the opera-
tion manuals.
5 Application Precautions
Observe the following precautions when using the PROFIBUS DP Gateway.
!WARNING Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always connect to a class-3 ground (100 Ωor less) when installing the
Units.
!Caution Failure to abide by the following precautions could lead to faulty operation of
the Unit or the system or could damage the Unit or Temperature Controllers
and R88A-MCW151-E. Always heed these precautions.
• Install double safety mechanisms to ensure safety against incorrect sig-
nals that may be produced by broken signal lines or momentary power
interruptions.
• When adding a new device to the network, make sure that the baud rate
is the same as other nodes.

xiv
Application Precautions 5
• When adding a new Host Link or Compoway-F node to the network, make
sure that the PROFIBUS DP Gateway is powered down, to prevent unex-
pected results when starting up the new node.
• Use specified communications cables.
• Do not extend connection distances beyond the ranges given in the spec-
ifications.
• Always turn OFF the power supply to the personal computer, Slaves, and
Communications Units before attempting any of the following.
• Mounting or dismounting the PROFIBUS DP Gateway, Power Supply
Units, I/O Units, CPU Units, or any other Units.
• Assembling a Unit.
• Setting DIP-switches or rotary switches.
• Connecting or wiring the cables.
• Connecting or disconnecting connectors.
• Be sure that all the mounting screws, terminal screws, Unit mounting
screws, and cable connector screws are tightened to the torque specified
in the relevant manuals. Incorrect tightening torque may result in malfunc-
tion.
• Leave the label attached to the Unit when wiring. Removing the label may
result in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dis-
sipation. Leaving the label attached may result in malfunction.
• Always use the power supply voltage specified in this manual.
• Double-check all the wiring and connection of terminal blocks and con-
nectors before mounting the Units.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals.
• Observe the following precautions when wiring the communications
cable.
• Separate the communications cables from the power lines or high-ten-
sion lines.
• Do not bend the communications cables.
• Do not pull on the communications cables.
• Do not place heavy objects on top of the communications cables.
• Be sure to wire communications cable inside ducts.
• Use appropriate communications cables.
• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied in places where the power supply
is unstable. An incorrect power supply may result in malfunction.
• Install external breakers and take other safety measures against short-cir-
cuits in external wiring. Insufficient safety measures against short-circuits
may result in burning.
• Double-check all the wiring and switch settings before turning ON the
power supply.
• When transporting or storing the product, cover the PCB’s with electrically
conductive materials to prevent LSI’s and IC’s from being damaged by
static electricity, and also keep the product within the specified storage
temperature range.

xv
Conformance to EC Directives 6
• When transporting the Unit, use special packing boxes and protect it from
being exposed to excessive vibration or impacts during transportation.
• Do not attempt to disassemble, repair, or modify any Units.
6 Conformance to EC Directives
6-1 Applicable Directives
•EMCDirectives
• Low voltage directive
6-2 Concepts
OMRON units complying with EC Directives also conform to related product
standards making them easier to incorporate in other units or machines. The
actual products have been checked for conformity to product standards.
Whether the products conform to the standards in the system used by the
customer, however, must be checked by the customer.
Product related performance of OMRON units complying with EC Directives
will vary depending on the configuration, wiring, and other conditions of the
equipment or control panel in which OMRON devices are installed. The cus-
tomer must, therefore, perform final checks to confirm that units and the over-
all system conforms to product standards.
A Declaration of Conformity for the PROFIBUS DP Gateway can be
requested at your nearest OMRON representative.
6-3 Conformance to EC Directives
PROFIBUS units should be installed as follows, for the complete configuration
to meet the EC directives:
1,2,3... 1. The units are designed for installation inside control panels. All units must
be installed within control panels.
2. Use reinforced insulation or double insulation for the DC power supplies
used for the communications power supply, internal circuit power supply,
and the I/O power supplies.
3. The PROFIBUS DP Gateway product meets the generic emission stan-
dard. However as EMC performance can vary in the final installation, ad-
ditional measures may be required to meet the standards. It should
therefore be verified that the overall machine or device also meets the rel-
evant standards. You must therefore confirm that EC directives are met for
the overall machine or device, particularly for the radiated emission re-
quirement (10 m).

1
SECTION 1
Features and Specifications
This section provides an introductory overview of PROFIBUS, its functions and how to setup and configure a network. It
also addresses the PRT1-SCU11 PROFIBUS DP Gateways and the Configurator, their features and specifications.
1-1 Overview of PROFIBUS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-2 PROFIBUS Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . 2
1-1-3 Device Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1-1-4 Bus Access Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1-1-5 Diagnostic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1-1-6 Protection mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1-1-7 Network Operation Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1-2 PROFIBUS DP Network configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1-3 PROFIBUS DP Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-3-1 PROFIBUS DP Gateway Features . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1-3-2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1-4 Basic Operating Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1-4-1 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1-4-2 Procedures Prior to Starting Communications . . . . . . . . . . . . . . . . . 15

2
Overview of PROFIBUS Section 1-1
1-1 Overview of PROFIBUS
1-1-1 Introduction
Standard EN50170 PROFIBUS (PROcess FIeldBUS) is an open fieldbus standard for a wide
range of applications in manufacturing, processing and building automation.
The Standard, EN 50170 (the Euronorm for field communications), to which
PROFIBUS adheres, guarantees vendor independence and transparency of
operation. It enables devices of various manufacturers to intercommunicate
without having to make any special interface adaptations.
The PROFIBUS family comprises three mutually compatible versions:
PROFIBUS FMS, PROFIBUS DP and PROFIBUS PA.
PROFIBUS FMS FMS means Fieldbus Message Specification. This version is the general-pur-
pose solution for high-level extensive and complex communication tasks.
Powerful services open up a wide range of applications and provide great
flexibility.
PROFIBUS DP DP means Decentralized Periphery. PROFIBUS DP is optimized for high
speed and low-cost interfacing. It is specially designed for communication
between automation control systems and distributed I/O at the device level.
PROFIBUS PA PA means Process Automation. It permits sensors and actuators to be con-
nected to one common bus even in areas where intrinsically safe products are
required. It also permits data and power to be supplied over the bus using
2-wire technology according the international standard IEC 1158-2.
Uniform Bus Access
Protocol PROFIBUS DP and PROFIBUS FMS use the same transmission technology
and uniform bus access protocol. Consequently, both versions can be oper-
ated simultaneously on the same bus. FMS field devices, however, cannot be
controlled by DP masters and vice versa.
!Caution It is not possible to exchange one of these family members by another family
member. This will cause faulty operation.
The rest of this section describes the PROFIBUS DP Protocol architecture.
1-1-2 PROFIBUS Communication Protocol
OSI reference model
ISO-7498
In general, the PROFIBUS communication protocol is based on the Open
System Interconnection (OSI) reference model in accordance with the inter-
national standard ISO-7498 (see the following illustration). The model defines
7 layers of communication functions, three of which - layers 1, 2, and 7 - are
used in PROFIBUS.
• Layer 1, the Physical Layer of this model, defines the physical transmis-
sion characteristics.
• Layer 2, the Data Link Layer of this model, defines the bus access proto-
col. This protocol also includes data security and the handling of trans-
mission protocols and telegrams.
• Layer 7, the Application Layer of this model, defines the application func-
tions. This Layer is only applicable to PROFIBUS FMS.

3
Overview of PROFIBUS Section 1-1
OSI Layer 1, 2 and User
Interface
PROFIBUS DP uses layers 1 and 2, and the user interface. Layers 3 to 7 are
not defined for PROFIBUS DP. The user interface Layer defines the interface
functions for specific application areas, i.e. the PROFIBUS DP basic functions
and communication profiles.This streamlined architecture ensures fast and
efficient data transmission. The application functions which are available to
the user, as well as the system and device behaviour of the various PROFI-
BUS DP device types, are specified in the user interface.
OSI Layer 1: Transmission
Medium
RS-485 transmission technology or fibre optics are available for transmission.
RS-485 transmission is the most frequently used transmission technology. Its
application area includes all areas in which high transmission speed and sim-
ple inexpensive installation are required. PROFIBUS modules are intercon-
nected by single twisted-pair shielded copper wires.
RS-485 Technology The RS-485 transmission technology is very easy to handle. Installation of the
twisted pair cable does not require expert knowledge. The bus structure per-
mits addition and removal of devices or step-by-step commissioning of the
system without influencing the other devices. Later expansions have no effect
on devices which are already in operation.
RS-485 Transmission
Speed Transmission speeds between 9.6 kbit/s and 12 Mbit/s can be selected as
shown in the table below. One unique transmission speed must selected for
all devices on the bus (master and slave devices) when the system is com-
missioned
Cable length The maximum cable length values depend on the transmission speed and are
based on type-A cable (see
Bus Cable Connector on page 34). The length
can be increased by the use of repeaters.However, it is not recommended to
use more than three repeaters in series in a PROFIBUS network.
DP-Profiles
User Interface Layer DP Basic Functions
(7) Application Layer
(6) Presentation Layer
(5) Session Layer NOT DEFINED
(4) Transport Layer
(3) Network Layer
(2) Data Link Layer Fieldbus Data Link (FDL)
(1) Physical Layer RS-485 / Fibre Optics
Baud rate (kbit/s) Distance / segment (m)
9.6 1200
19.2 1200
45.45 1200
93.75 1200
187.5 1000
500 400
1500 200
3000 100
6000 100
12000 100

4
Overview of PROFIBUS Section 1-1
1-1-3 Device Types
PROFIBUS distinguishes between master devices and slave devices.
Master Devices Master devices determine the data communication on the bus. A Master can
send messages without an external request, as long as it holds the bus
access right (the token). Masters are also referred to as active devices in the
PROFIBUS standard.
There are two types of master devices:
Class 1 Master (DPM1) A PROFIBUS DP Class 1 Master (DPM1) device is a central controller, which
exchanges information with the decentralized devices (i.e. DP slaves) within a
specified message cycle.
Class 2 Master (DPM2) PROFIBUS DP class 2 Master (DPM2) devices are programmers, configura-
tion devices or operator panels. They are used during commissioning, for con-
figuration of the DP system, or for operation and monitoring purposes.
Slave Devices Slave devices are peripheral devices. Typical slave devices include input/out-
put devices, valves, drives, and measuring transmitters. They do not have bus
access rights and they can only acknowledge received messages or send
messages to the master when requested to do so. Slave devices are also
called passive devices. The PRT1-SCU11 is a slave device.
Device Profile To enable the exchange of devices from different vendors, the user data has
to have the same format. The PROFIBUS DP protocol does not define the for-
mat of user data, it is only responsible for the transmission of this data. The
format of user data may be defined in so called profiles. Profiles can reduce
engineering costs since the meaning of application-related parameters is
specified precisely. Profiles have been defined for specific areas like drive
technology, encoders, and for sensors / actuators.
1-1-4 Bus Access Protocol
OSI Layer 2: Bus Access
Protocol
The PROFIBUS bus access protocol is implemented by OSI layer 2. This pro-
tocol also includes data security and the handling of the transmission proto-
cols and messages.
Medium Access Control The Medium Access Control (MAC) specifies the procedures which determine
when a device is permitted to transmit data. A token passing procedure is
used to handle the bus access between master devices, and a polling proce-
dure is used to handle the communication between a master device and its
assigned slave device(s).
Token Passing The token passing procedure guarantees that the bus access right (the token)
is assigned to each master within a precisely defined time frame. The token
message, a special message for passing access rights from one master to the
next master, must be passed around the logical token ring - once to each
master - within a specified target rotation time. Each master executes this pro-
cedure automatically.
Polling Procedure The polling or master-slave procedure permits the master, currently in pos-
session of the token, to access its assigned slaves. The figure below shows a
possible configuration The configuration shows three active devices (masters)
and six passive devices (slaves).
The three masters form a logical token ring. When an active device receives
the token message, it can perform its master role for a certain period of time.
During this time it can communicate with all assigned slave devices in a mas-
ter-slave communication relationship, and a DPM2 master can take the initia-

5
Overview of PROFIBUS Section 1-1
tive to communicate with DPM1 master devices in a master-master
communication relationship.
Multi-peer Communication In addition to logical peer-to-peer data transmission, PROFIBUS DP provides
multi-peer communication (broadcast and multicast).
Broadcast
Communication
In the case of broadcast communication a master device sends an unac-
knowledged message to all other devices (masters and slaves).
Multicast Communication In the case of multicast communication a master device sends an un-
acknowledged message to a predetermined group of devices (masters and
slaves).
1-1-5 Diagnostic functions
Extensive Diagnostics Extensive diagnostic functions defined in PROFIBUS DP enable the fast loca-
tion of error at slave devices. Diagnostic messages are transmitted over the
bus and collected at the master. Three levels of diagnostic messages are
defined:
Device Related
Diagnostics
• Messages concerning the general operational status of the whole device,
e.g. over temperature, low voltage.
Module Related
Diagnostics
• Messages indicating that an error is present in a specific I/O range of a
device, e.g. an 8-bit output module.
Channel Related
Diagnostics
• Messages indicating an error at a given input or output, e.g. short circuit
on Output 5.
1-1-6 Protection mechanisms
Monitoring Time PROFIBUS DP provides effective protection functions against parameteriza-
tion errors or failure of the transmission equipment. Time monitoring is pro-
vided both at the master and the slave devices. The monitoring interval is
specified when the system is configured.
Monitoring at the Master The PROFIBUS DP Master monitors data transmission of the slaves with the
Data-Control-Timer. A separate control timer is used for each slave. This
timer expires if response data is not correctly transmitted by the slave within
the monitoring interval. The user is informed when this happens. If the auto-
matic error reaction (Auto-CLEAR) has been enabled, the PROFIBUS DP