null  null
 PROFIBUS with STEP 7 V12
___________________
Preface
1
___________________
Documentation guide
SIMATIC
PROFIBUS
PROFIBUS with STEP 7 V12
2
___________________
Description
Parameter
3
___________________
assignment/addressing
4
___________________
Diagnostics
5
___________________
Functions
Function Manual
01/2013
A5E03775446-01
A
___________________
Service & Support
Legal information
Warning notice system
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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.
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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
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ambient conditions must be complied with. The information in the relevant documentation must be observed.
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
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Siemens AG
Industry Sector
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90026 NÜRNBERG
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A5E03775446-01
Ⓟ 01/2013 Technical data subject to change
Copyright © Siemens AG 2013.
All rights reserved
Preface
Purpose of the manual
This function manual provides an overview of the PROFIBUS communication
in combination with SIMATIC STEP 7 V12.
STEP 7 V12 is integrated into the powerful graphic Totally Integrated Automation Portal
(TIA Portal), the new integration platform for all automation software tools.
This function manual supports you in planning a PROFIBUS system.
The manual is structured into the following subject areas:
● PROFIBUS basics
● PROFIBUS diagnostics
● PROFIBUS functions
Basic knowledge required
The following knowledge is required in order to understand the manual:
● General knowledge of automation technology
● Knowledge of the industrial automation system SIMATIC
● Knowledge about the use of Windows-based computers
● Proficiency with STEP 7
Scope
This function manual is the basic documentation for all SIMATIC products from the
PROFIBUS environment. The product documentation is based on this documentation.
The examples are based on the functionality of the S7-1500 automation system.
Conventions
STEP 7: In this documentation we use "STEP 7" to refer to the configuration and
programming software as synonym for "STEP 7 V12 (TIA Portal)" and later versions.
This documentation contains figures of the devices described. The figures may differ
slightly from the devices supplied.
Please also observe notes marked as follows:
Note
A note contains important information on the product, on handling of the product and on the
section of the documentation to which you should pay particular attention.
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Preface
Additional support
Information on the offers of our Technical Support are available in the appendix
Service & Support (Page 79).
The technical documentation for the individual SIMATIC products and systems is
available on the Internet (http://www.siemens.com/simatic-tech-doku-portal).
The online catalog and the online ordering system are available on the Internet
(http://mall.automation.siemens.com).
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Table of contents
Preface ...................................................................................................................................................... 3
1
Documentation guide................................................................................................................................. 7
2
Description................................................................................................................................................. 9
3
2.1
2.1.1
2.1.2
2.1.3
Introduction to PROFIBUS.............................................................................................................9
Applications of PROFIBUS DP ......................................................................................................9
PROFIBUS terminology ...............................................................................................................11
PROFIBUS DP interface..............................................................................................................15
2.2
2.2.1
2.2.1.1
2.2.1.2
2.2.1.3
2.2.1.4
2.2.1.5
2.2.1.6
2.2.2
2.2.2.1
2.2.2.2
2.2.2.3
2.2.3
2.2.3.1
2.2.3.2
2.2.4
2.2.4.1
2.2.4.2
2.2.4.3
2.2.4.4
2.2.4.5
Structure of PROFIBUS networks................................................................................................16
Passive network components for RS 485 networks ....................................................................18
RS 485 cables..............................................................................................................................18
PROFIBUS FastConnect system.................................................................................................19
PROFIBUS bus connector ...........................................................................................................21
M12 bus connector ......................................................................................................................23
Bus terminals for RS 485 networks .............................................................................................23
M12 bus terminating resistor........................................................................................................23
Passive components for optical networks....................................................................................24
Fiber-optic cables.........................................................................................................................24
Plastic and PCF fiber-optic cables ...............................................................................................25
Glass fiber-optic cables................................................................................................................26
Active network components .........................................................................................................28
Network components in electrical networks.................................................................................28
Network components in optical networks ....................................................................................32
Examples for topology .................................................................................................................34
Topology with RS485 repeater ....................................................................................................34
Topology with diagnostic repeater ...............................................................................................36
OLM topology...............................................................................................................................39
WLAN topology ............................................................................................................................39
Connecting PROFIBUS to PROFINET ........................................................................................40
Parameter assignment/addressing .......................................................................................................... 41
3.1
Assigning the DP slave to a DP master.......................................................................................42
3.2
PROFIBUS address.....................................................................................................................44
3.3
Network settings ..........................................................................................................................45
3.4
Cable configuration ......................................................................................................................48
3.5
Additional network stations ..........................................................................................................50
3.6
Bus parameters............................................................................................................................51
3.7
Constant bus cycle time...............................................................................................................54
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Table of contents
4
5
A
Diagnostics .............................................................................................................................................. 57
4.1
Overview ..................................................................................................................................... 57
4.2
Diagnostics using the display of the S7-1500 ............................................................................. 58
4.3
Diagnostics with the diagnostic repeater .................................................................................... 59
4.4
I&M data (Identification and Maintenance) ................................................................................. 60
Functions ................................................................................................................................................. 61
5.1
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.1.8
5.1.8.1
5.1.8.2
Isochronous mode....................................................................................................................... 61
What is isochronous mode?........................................................................................................ 61
Use of isochronous mode ........................................................................................................... 62
Isochronous applications............................................................................................................. 62
Sequence of synchronization ...................................................................................................... 64
Requirements for configuration ................................................................................................... 65
Configuring isochronous mode ................................................................................................... 66
Diagnostics and interrupt functions............................................................................................. 69
Parameter settings for isochronous mode .................................................................................. 70
Viewing isochronous mode parameters...................................................................................... 71
Change parameters .................................................................................................................... 72
5.2
Acyclical data exchange.............................................................................................................. 74
5.3
SYNC/FREEZE groups ............................................................................................................... 75
5.4
Interrupts ..................................................................................................................................... 77
Service & Support.................................................................................................................................... 79
Glossary .................................................................................................................................................. 83
Index........................................................................................................................................................ 89
PROFIBUS with STEP 7 V12
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Documentation guide
Introduction
This modular documentation of the SIMATIC products covers diverse topics concerning
your automation system.
The complete documentation for the S7-1500, ET 200SP and ET 200MP systems consists
of the respective system manual, function manuals and device manuals.
The STEP 7 information system (Online Help) also helps you configure and program your
automation system.
Overview of the additional documentation for PROFIBUS
The table below lists additional documents which supplement this description of PROFIBUS
and which are available on the Internet.
Table 1- 1
Documentation for PROFIBUS
Subject
Documentation
Most important contents
PROFIBUS overview
information
PROFIBUS
(http://www.automation.siemens.com/w
2/efiles/pcs7/pdf/76/prdbrief/kb_profibu
s_en.pdf) brochure
•
Overview
•
Application examples
•
Hardware
•
Software
STEP 7 (TIA Portal)
STEP 7 Professional V12 online help
System diagnostics
System Diagnostics
•
(http://support.automation.siemens.com
•
/WW/view/en/59192926) function
•
manual
Overview
S7-1500 automation system
•
(http://support.automation.siemens.com
•
/WW/view/en/59191792)
•
ET 200SP distributed I/O system
Application planning
Description of the
systems
Configuring and programming
with the engineering software
(http://support.automation.siemens.com •
/WW/view/en/58649293)
•
ET 200MP distributed I/O system
(http://support.automation.siemens.com
/WW/view/en/59193214)
Diagnostic evaluation
Hardware/software
Installation
Wiring
Commissioning
I&M data
PROFIBUS with STEP 7 V12
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Documentation guide
Subject
Documentation
Networks
PROFIBUS network manual
•
(http://support.automation.siemens.com
/WW/view/en/35222591)
•
Diagnostic repeater
Modules of the S7-1500
automation system
Most important contents
Basics of PROFIBUS
networks
Network configuration
•
Active and passive
components
•
Technical product
specifications
•
Installation instructions
SIMATIC NET Manual: Twisted-pair
•
and fiber-optic networks
•
(http://support.automation.siemens.com
•
/WW/view/en/8763736)
Ethernet networks
Manual Diagnostic repeater for
•
PROFIBUS DP
•
(http://support.automation.siemens.com
•
/WW/view/en/7915183)
Configuration options
Network configuration
Network components
Installation
Wiring
•
Commissioning
•
Diagnostics
Manuals for the S7-1500 product family •
(http://support.automation.siemens.com
/WW/view/en/56926743)
•
Interrupt, error and system
messages
Technical specifications
(including communication
services)
Additional information on PROFIBUS is available on the Internet (http://www.profibus.com).
SIMATIC manuals
All current manuals for SIMATIC products are available for download free of charge on the
Internet (http://www.siemens.com/automation/service&support).
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Description
2.1
2
Introduction to PROFIBUS
What is PROFIBUS?
PROFIBUS is a bus system that networks automation systems and field devices that are
compatible with PROFIBUS. As communication medium for the field level, PROFIBUS is
an important part of Totally Integrated Automation (TIA).
The different communication networks can be used independent of one another or they
can be combined with each other.
PROFIBUS protocols
PROFIBUS DP (distributed I/O) is a communication network for the field level according to
IEC 61158-2 / EN 61158-2 with the hybrid access protocols token bus and master-slave.
The networking takes place by means of two-wire lines or fiber-optic cables.
Data transmission rates of 9.6 kbps to 12 Mbps are possible.
PROFIBUS PA is the PROFIBUS for process automation (PA). It connects the
PROFIBUS DP communication protocol with the MBP (Manchester Bus Powered)
transmission technology to IEC 61158-2.
PROFIBUS PA networks can be designed based on shielded, twisted two-wire lines
intrinsically safe and are therefore suitable for hazardous areas (Ex zones 0 and 1).
The data transmission rate is 31.25 kbps.
2.1.1
Applications of PROFIBUS DP
Introduction
The efficiency of control systems is not determined by automation devices alone,
but depends to a large extent on the overall configuration of an automation solution.
This includes a powerful communication system in addition to plant visualization and
operator control and monitoring.
The STEP 7 engineering tool supports you during the engineering and configuration
of an automation solution.
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Description
2.1 Introduction to PROFIBUS
Applications of PROFIBUS DP
The PROFIBUS network offers wireless connection of several controllers, components and
subnets as electrical network, optical network or by using links. Sensors and actuators are
controlled centrally by means of PROFIBUS DP.
The example shows connection options to PROFIBUS DP:
SIMATIC Controller
SIMATIC HMI
7,$
352),%86
Repeater
DP/DP coupler
'LDJQRVWLF
UHSHDWHU
352),%86
,:/$13%
/LQN31,2
,(3%
/LQN
6&$/$1&(
:
352),1(7,QGXVWULDO(WKHUQHW
Figure 2-1
'3$6L
/LQN
$GYDQFHG
$6,QWHUIDFH
Connection options to PROFIBUS DP
Objectives of PROFIBUS DP
Distributed automation systems are increasingly used in production and process automation.
This means a complex control task is divided up into smaller, more transparent subtasks with
distributed control systems. This creates a high demand for communication between the
distributed systems.
Distributed systems offer the following benefits:
● An independent and simultaneous commissioning of individual devices is possible.
● Small, manageable programs
● Parallel processing due to distributed automation systems
● Reduced response times
● Higher-level structures can take on additional diagnostic and logging functions.
● Increased plant availability because the rest of the overall system can continue to work
when a subordinate station fails.
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Description
2.1 Introduction to PROFIBUS
2.1.2
PROFIBUS terminology
Definition: Devices in the PROFIBUS environment
In the PROFIBUS environment, "device" is the generic term for:
● Automation systems (for example, PLC, PC)
● Distributed I/O systems
● Field devices (for example, hydraulic devices, pneumatic devices)
● Active network components (e.g., diagnostic repeater, optical link module)
● Gateways to AS interface or other fieldbus systems
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Description
2.1 Introduction to PROFIBUS
Devices with PROFIBUS DP
The figure below shows the most important components with PROFIBUS DP.
The table below lists the designations of the individual components.
1
6
3*3&
2
3
352),%86
4
6
(763
7
6
+0,
5
Number PROFIBUS
①
②
Note
DP master system
DP master
Device used to address the connected DP slaves.
The DP master exchanges input and output signals with field
devices.
The DP master is often the controller on which the automation
program runs.
③
PG/PC
④
⑤
⑥
PG/PC/HMI device for commissioning and diagnostics
DP master of class 2
PROFIBUS
Network infrastructure
HMI
Device for operating and monitoring functions
DP slave
⑦
Distributed field device assigned to the DP master,
e.g., valve terminals, frequency converters.
I-slave
Intelligent DP slave
Figure 2-2
Devices with PROFIBUS
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Description
2.1 Introduction to PROFIBUS
Overview of I/O communication
I/O communication is the reading or writing of inputs/outputs of the distributed I/O.
The figure below gives you an overview of I/O communication using PROFIBUS DP:
'3'3FRXSOHU
'3PDVWHU
'3PDVWHU
$
%
&
%
352),%86
VXEQHW
352),%86
VXEQHW
,VODYH
,VODYH
'3VODYH
$'3PDVWHU'3PDVWHUFRPPXQLFDWLRQ
%'3PDVWHU,VODYHFRPPXQLFDWLRQ
Figure 2-3
&'3PDVWHU'3VODYHFRPPXQLFDWLRQ
I/O communication using PROFIBUS DP
I/O communication is also available with the communication module (CM) or the
interface module (IM) with integrated DP interface. These DP interfaces behave like
integrated DP interfaces of the CPU.
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Description
2.1 Introduction to PROFIBUS
I/O communication using PROFIBUS DP
Table 2- 1
I/O communication using PROFIBUS DP
Communication between …
Explanation
DP master and DP slave
The data exchange between a DP master and DP slaves with I/O modules takes place as
follows: The DP master queries the DP slaves of its master system one after the other and
receives input values from the DP slaves and transmits output data to the DP slaves
(master-slave principle).
DP master and I-slave
A fixed number of data is transmitted cyclically between the user programs in CPUs of
DP masters and I-slaves.
The DP master does not access the I/O modules of the I-slave, but instead accesses
configured address areas, called transfer areas, that can be inside or outside the process
image of the I-slave CPU. If parts of the process image are used as transfer areas, these
may not be used for actual I/O modules.
Data transmission takes place with load and transfer operations using the process image
or by direct access.
DP master and DP master
A fixed number of data is transmitted cyclically between the user programs in CPUs of
DP masters. A DP/DP coupler is required as additional hardware.
The DP masters mutually access configured address areas, called transfer areas, inside
or outside the process images of the CPUs. If parts of the process image are used as
transfer areas, these may not be used for actual I/O modules.
Data transmission takes place with load and transfer operations using the process image
or by direct access.
Additional information
You can find additional information on the hardware configuration in the STEP 7 online help.
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Description
2.1 Introduction to PROFIBUS
2.1.3
PROFIBUS DP interface
Properties
A PROFIBUS device has at least one PROFIBUS interface with an electrical (RS 485)
interface or optical (Polymer Optical Fiber, POF) interface.
Table 2- 2
Properties of the PROFIBUS DP interface
Standard
PROFIBUS: IEC 61158/61784
Bus configuration / media
PROFIBUS cables
(twisted two-wire lines RS 485 or fiber-optic cables)
Transmission rate
9.6 kbps to 12 Mbps
Representation of the PROFIBUS DP interface in STEP 7
In the device view of STEP 7, the PROFIBUS DP interfaces for a DP master and a DP slave
are highlighted by a purple rectangle:
Figure 2-4
PROFIBUS DP interfaces
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Description
2.2 Structure of PROFIBUS networks
2.2
Structure of PROFIBUS networks
Contents of this chapter
The following chapter provides background information on building your
communication network.
● Overview of the most important passive network components: These are network
components that forward a signal without the possibility of actively influencing it,
for example, cables, connectors.
● Overview of the most important active network components: These are network
components that actively affect a signal, for example, repeaters, diagnostic repeaters.
● Overview of the most common network structures (topologies)
Physical connections of industrial networks
PROFIBUS devices can be networked in industrial plants in two different physical ways:
● By means of electrical signals via copper cables
● By means of optical signals via fiber-optic cables
Selection criteria for networking
The table below includes selection criteria for electrical and optical networking of
PROFIBUS devices:
Table 2- 3
Selection criteria for electrical and optical networking
Criteria
Transmission
medium
Distances
Electrical
PROFIBUS
Optical network
with OLM
Optical network
with OBT
Shielded two-wire
line
●
–
–
POF
–
●
●
PCF
–
●
●
Glass
–
●
–
Max. network span
PROFIBUS DP:
9.6 km
90 km
9.6 km
PROFIBUS PA:
1.9 km
Topology
Transmission
protocols
Between two devices
up to 1 km 1)
up to 15 km 2)
up to 300 m 2)
Bus
●
–
–
Linear
–
●
●
Tree
●
●
●
Ring
–
●
●
DP, PA
DP, PA
DP
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Description
2.2 Structure of PROFIBUS networks
Criteria
Connection of
devices by means
of
Electrical
PROFIBUS
Optical network
with OLM
Optical network
with OBT
OLM
–
●
–
Integrated interfaces
●
–
●
Bus terminal
●
–
●
Bus connector
●
–
–
●
●
–
Electrical network
segments can be
connected
● Suitable
– Not relevant for this application
1) Depending on data rate and type of service used
2) Depending on cable type used
Installation guideline for PROFIBUS networks
A PROFIBUS segment must be terminated at the start and end;
passively with a connector or actively with a bus terminating resistor.
The same principles apply to the installation of a PROFIBUS network as described
in the SIMATIC NET PROFIBUS networks
(http://support.automation.siemens.com/WW/view/en/35222591) manual.
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Description
2.2 Structure of PROFIBUS networks
2.2.1
Passive network components for RS 485 networks
2.2.1.1
RS 485 cables
Introduction
The following applies to all RS 485 cables for PROFIBUS from Siemens:
● Their double shielding makes them especially suited for laying in industrial environments
with electromagnetic interference.
● A continuous grounding concept can be implemented by means of the outer shield
of the bus cable and the ground terminals of the bus terminals.
● The imprinted meter marking makes it easier to determine the length (accuracy ±5 %).
RS 485 cables for PROFIBUS
SIMATIC NET PROFIBUS cables are available in different versions which makes
for an optimum adaptation to different areas of application:
● FC Standard Cable GP (bus cable for fixed laying inside buildings)
● FC Standard Cable IS GP (bus cable for hazardous area)
● FC-FRNC Cable GP (bus cable with halogen-free protective jacket for use inside
buildings)
● FC Food Cable (bus cable with PE jacket for use in the food and beverage industry)
● FC Robust Cable (bus cable with PUR jacket for environments subject to chemical
and mechanical stress)
● FC Ground Cable (ground cable with PE jacket)
● PROFIBUS FC Trailing Cable (trailing cable for tow chains)
● PROFIBUS Festoon Cable (bus cable for festoon mounting)
● PROFIBUS Torsion Cable (torsion-free bus cable for networking movable plant parts,
for example, robots)
● PROFIBUS FC Flexible Cable (bus cable for machine parts that are moved infrequently
or cabinet doors)
● SIENOPYR-FR ship cable (for permanent laying on ships and off-shore units in all rooms
and on open deck)
● PROFIBUS Hybrid Standard Cable (hybrid cable with 2 power wires (1.5 mm2)
for data and power supply of the ET 200pro)
● PROFIBUS Hybrid Robust Cable (trailable hybrid cable with 2 power wires (1.5 mm2)
for data and power supply of the ET 200pro)
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Description
2.2 Structure of PROFIBUS networks
Maximum cable lengths
When using copper cables, the maximum size of a PROFIBUS segment depends on the
transmission rate.
If these lengths are not sufficient for your application, you can expand the network
by using repeaters. You can achieve a maximum size by cascading up to nine repeaters.
Table 2- 4
2.2.1.2
Maximum cable lengths
Transmission rate
Maximum cable length of a
bus segment
Maximum distance between
two stations
9.6 to 187.5 kbps
1000 m
10000 m
500 kbps
400 m
4000 m
1.5 Mbps
200 m
2000 m
3 to 12 Mbps
100 m
1000 m
PROFIBUS FastConnect system
PROFIBUS FastConnect (FC)
PROFIBUS FastConnect is a system for fast and easy fabrication of PROFIBUS
copper cables.
The system consists of three components:
● FastConnect bus cables for quick mounting
● FastConnect stripping tool
● FastConnect bus connector for PROFIBUS with insulation displacement method
FastConnect bus cables and stripping tool
The special design of the FastConnect bus cables allows for the use of the FastConnect
stripping tool to accurately strip away the outer jacket and the braided shield in one step.
The connection of the prepared cables takes place in the FastConnect bus connectors
using the insulation displacement method.
All PROFIBUS FastConnect bus cables can also be connected to the conventional bus
connectors with screw-type terminals.
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Description
2.2 Structure of PROFIBUS networks
Area of application
You need FastConnect bus connectors for PROFIBUS for the following applications:
● Connect devices with an electrical 9-pin D-Sub interface to IEC 61158-2 directly with
SIMATIC NET PROFIBUS cables.
● Connect electrical segments or individual devices to the Optical Link Module (OLM)
and Optical Bus Terminal (OBT).
● Connect devices or programming devices to the repeater.
Versions
The FastConnect bus connector in degree of protection IP20 is available in the
following versions:
● with integrated terminating resistor and isolating function
● with or without PG socket
● with a cable outlet of 35°, 90° or 180°
● with device category 3G suitable for hazardous area of zone 2
Figure 2-5
Example for PROFIBUS FastConnect bus connector with PG socket, cable outlet 90°
Additional information
For additional information on the available components visit the Siemens Mall
(http://mall.automation.siemens.com).
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Description
2.2 Structure of PROFIBUS networks
2.2.1.3
PROFIBUS bus connector
Area of application
You need PROFIBUS bus connectors for the following applications:
● Connect devices with a 9-pin D-Sub interface to IEC 61158-2 directly with the
SIMATIC NET PROFIBUS cables.
● Connect electrical segments or individual devices to the Optical Link Module (OLM)
and Optical Bus Terminal (OBT).
● Connect devices or programming devices to the repeater.
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Description
2.2 Structure of PROFIBUS networks
Versions
The PROFIBUS bus connector in degree of protection IP20 is available
in the following versions:
● with integrated terminating resistor and isolating function
● with or without PG socket
● with a cable outlet of 35°, 90° or 180°
● with device category 3G suitable for hazardous area of zone 2
Figure 2-6
Example for PROFIBUS bus connector with PG socket, cable outlet 35°
Additional information
For additional information on the available components visit the Siemens Mall
(http://mall.automation.siemens.com).
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Description
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2.2.1.4
M12 bus connector
Area of application
Devices with an electrical M12 interface can use the M12 bus connector for
SIMATIC NET PROFIBUS for direct connection with the SIMATIC NET PROFIBUS cables.
The M12 bus connector in degree of protection IP65 is available in the following versions:
● with screw-type terminals
● with insulation displacement termination
● with a cable outlet of 180°
2.2.1.5
Bus terminals for RS 485 networks
Bus terminal RS 485 and bus terminal M12
A bus terminal is used for the connection of an individual PROFIBUS station with
RS485 interface to the PROFIBUS bus cable.
Bus terminals in degree of protection IP20 are available in the following versions:
● Bus terminal RS 485 with or without PG interface, transmission rate 9.6 kbps to 1.5 Mbps,
integrated terminating resistor combination (connectible), with 1.5 m and 3 m connecting
cable
● Bus terminal M12, transmission rate 9.6 kbps to 12 Mbps, integrated terminating
resistor combination with isolating function, with 1.5 m connecting cable
2.2.1.6
M12 bus terminating resistor
Terminating segment with terminating resistor
If there is a station with M12 connection system at the beginning or end of a
PROFIBUS segment, you need an M12 bus terminating resistor.
The M12 PROFIBUS connection of a device consists of an M12 socket for the
infeed and an M12 male connector to loop-through the bus signal.
This means you need one bus terminating resistor with male contacts (6GK1905-0EC00)
and with female contacts (6GK1905-0ED00) for each M12 bus cable.
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Description
2.2 Structure of PROFIBUS networks
2.2.2
Passive components for optical networks
2.2.2.1
Fiber-optic cables
Types of fiber-optic cables
Data transmission with fiber-optic cables takes place through modulation of electromagnetic
waves in the range of visible and invisible light. These cables are made of high-quality
plastic fibers and glass fibers:
● Plastic and PCF fiber-optic cables (Page 25)
● Glass fiber-optic cables (Page 26)
The different types of fiber-optic cables provide solutions matched to the operating and
environmental conditions for the connection of components with each other.
Benefits
Fiber-optic cables offer the following benefits when compared with electrical cables:
● Galvanic isolation of the devices and segments
● No potential equalization currents
● No impact on transmission path through external electromagnetic interference
● No lightning protection elements required
● No noise radiation along the transmission route
● Low weight
● Depending on the type of fiber you can implement cable lengths up to few kilometers
at even higher transmission rates.
● No dependency of the maximum permitted distances on the transmission rate
Additional information
Additional information of the properties and technical specifications of the passive
components and connectors for fiber-optic cables is available in the PROFIBUS network
manual (http://support.automation.siemens.com/WW/view/en/35222591).
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Description
2.2 Structure of PROFIBUS networks
2.2.2.2
Plastic and PCF fiber-optic cables
Plastic and PCF fiber-optic cables
Plastic (POF) and PCF fiber-optic cables are used for the connection of Optical Link
modules with connections for plastic fiber-optic cables (OLM/P), Optical Bus Terminal (OBT)
and devices with integrated optical interfaces. Under certain conditions, they are an
inexpensive alternative to conventional glass fiber-optic cables.
Plastic Fiber Optic duplex core
The plastic fiber-optic duplex core is a flat dual core with PVC inner jacket without protective
jacket. The cable can be easily assembled on-site.
The cable is intended for indoor applications with low mechanical loads or inside cabinets.
For OLM connections and with integrated optical interfaces you cover a length of up to 50 m
between two devices with this cable.
Plastic Fiber Optic standard cable
The plastic fiber optic standard cable consists of two plastic fibers with robust polyamide
inner jacket surrounded by Kevlar tensile elements and a purple PVC protective jacket.
The cable can be easily assembled on-site.
The robust round cable is suited for indoor applications. The maximum distance that can be
covered is 80 m for OLM/P connections and 50 m with integrated optical interfaces and OBT.
PCF Standard Cable
The pre-assembled PCF Standard Cable consists of two PCF fibers surrounded by Kevlar
tensile elements and a purple PVC protective jacket. It is always supplied with a pulling aid
installed on one end to pull in the cable channels.
The robust round cable is suited for indoor applications with cable lengths up to 400 m
(OLM) or 300 m (integrated optical interfaces, OBT) between two devices.
PCF Standard Cable GP
The PCF Standard Cable GP consists of two PCF fibers surrounded by Aramid tensile
elements and a green PVC protective jacket. The cable is pre-assembled and can be
ordered by the meter. It is supplied with a pulling aid installed on one end to pull in the
cable channels.
The robust round cable is suited for indoor and outdoor applications with cable lengths
up to 400 m (OLM) or 300 m (integrated optical interfaces, OBT) between two devices.
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Description
2.2 Structure of PROFIBUS networks
PCF Trailing Cable
The PCF Trailing Cable consists of two PCF fibers surrounded by Aramid tensile elements
and a green PUR protective jacket. The cable is pre-assembled and can be ordered by the
meter. It is supplied with a pulling aid installed on one end to pull in the cable channels.
The robust round cable is suited for moving indoor and outdoor applications with cable
lengths up to 400 m (OLM) or 300 m (integrated optical interfaces, OBT) between two
devices.
PCF Trailing Cable GP
The PCF Trailing Cable GP consists of two PCF fibers surrounded by Aramid tensile
elements and a green PVC protective jacket. The cable is pre-assembled and can be
ordered by the meter. It is supplied with a pulling aid installed on one end to pull in the
cable channels.
The robust round cable is suited for moving indoor and outdoor applications with cable
lengths up to 400 m (OLM) or 300 m (integrated optical interfaces, OBT) between two
devices.
2.2.2.3
Glass fiber-optic cables
Glass fiber-optic cables
Glass fiber-optic cables are suitable for connection of optical interfaces that work in the
wavelength range around 850 nm and around 1300 nm. They include two graded-index
multimode fibers of the type 62.5/125 μm.
The glass fiber-optic cables are available in different versions which makes for an optimum
adaptation to different areas of application:
● Fiber Optic standard cable
● INDOOR Fiber Optic indoor cable
● Flexible Fiber Optic trailing cable
Fiber Optic standard cable
The standard cable is the universal cable for indoor and outdoor use.
INDOOR Fiber Optic indoor cable
The indoor cable is intended for weather-proof indoor use. It is halogen-free,
non-crush and flame-retardant.
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Description
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Flexible Fiber Optic trailing cable
The trailing cable was designed for the special application of forced movement, for example,
for constantly moved machine parts such as trailing chains. It is mechanically designed for
100,000 bending cycles by ±90° (with the specified minimum radius). Integrated dummy
elements ensure a round cross-section of the cable. The trailing cable can be used indoors
and outdoors.
Maximum distances between two optical link modules
The following distances may not be exceeded between two OLMs regardless of the
optical power budget:
● OLM/P11, OLM/P12: 400 m
● OLM/G11, OLM/G12, OLM/G12-EEC: 3 km
● OLM/G11-1300, OLM/G12-1300: 15 km
Additional information
All operating instructions
(http://support.automation.siemens.com/WW/view/en/10805951/133300) of the
SIMATIC NET bus components include information on distances that can be covered with
the SIMATIC NET glass fiber-optic cables. You can configure your optical network without
any calculations using simple limits.
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Description
2.2 Structure of PROFIBUS networks
2.2.3
Active network components
2.2.3.1
Network components in electrical networks
Active network components
The following active network components are available for PROFIBUS in electrical networks:
● Repeater RS485
● Diagnostic repeater
● PROFIBUS Terminator
● DP/DP coupler
● IE/PB Link PN IO
● IWLAN/PB Link PN IO
● Active components for the connection of CAN
● Active components for the gateway between PROFIBUS and AS-Interface
– DP/AS-i LINK Advanced
– DP/AS-Interface Link 20E
– DP/AS-i F-Link
RS485 repeater
The RS485 IP20 repeater connects two PROFIBUS bus segments in RS485 technology
with up to 32 devices. It provides transmission rates from 9.6 kbps to 12 Mbps.
The RS485 repeater refreshes a signal regarding amplitude, signal width and edge
steepness between two segments. It is used when more than 32 stations are connected to
the bus or the maximum cable length of a segment is exceeded.
Bus segments can be operated ungrounded (galvanic isolation of segments) with a RS485
repeater.
Diagnostic repeater
The diagnostic repeater connects three PROFIBUS segments in RS485 technology,
two of which are diagnostics-capable segments with 31 devices each. It is designed as
DP slave to send diagnostic messages to the DP master.
The diagnostic function provides the location and the cause of cable faults, such as wire
break or missing terminating resistors. The fault location is indicated relative to the existing
devices.
The diagnostic repeater refreshes a signal regarding amplitude, signal width and edge
steepness between two segments. The cascading depth between any two PROFIBUS
devices is limited to nine diagnostic repeaters.
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PROFIBUS Terminator
The PROFIBUS Terminator forms an active bus termination. Bus devices can be switched
off, removed or replaced without affecting data transmission. This is particularly true for bus
devices on both ends of the bus cable at which terminating resistors must be connected or
supplied. The PROFIBUS Terminator can be mounted on a standard mounting rail.
IE/PB Link PN for the connection of a PROFIBUS segment to an Industrial Ethernet network
The IE/PB Link PN IO as independent component provides the seamless transition between
Industrial Ethernet and PROFIBUS. By using the IE/PB Link PN IO as substitutes on the
Ethernet, the existing PROFIBUS devices can still be used and integrated into a PROFINET
application.
A PROFINET IO controller is required for this configuration. The IE/PB Link PN acts as
master on the PROFIBUS end.
IWLAN/PB Link PN IO as gateway between LAN and PROFIBUS
PROFIBUS devices can be coupled to PROFINET IO by means of IWLAN/PB Link PN IO.
This means you can integrate existing PROFIBUS configurations into PROFINET.
The IWLAN/PB Link PN IO supports the use of IWLAN and WLAN antennas for wireless
data transmission, for example, in suspended monorail systems or conveyor systems.
By supporting PROFINET, the numerous PROFIBUS system services,
for example, diagnostic by bus, can still be used.
A PROFINET IO controller is required for this configuration. The IWLAN/PB Link PN IO
acts as master on the PROFIBUS end.
CANopen module for connection to CAN
You can use the CANopen module to easily connect CANopen applications to PROFIBUS.
Typical areas of application:
● Control of hydraulic valves / hydraulic axles in vehicles
● Control of motors in packaging machines and on conveyor belts
● Use in wind turbines for detection of angular encoders
● Detection of HMI devices on machines, e.g., joysticks
● Detection of measured data from displacement transducers, inclination sensors or angle
encoders on tower cranes or gantry cranes
DP/DP coupler for connection of two PROFIBUS networks
The PROFIBUS DP/DP coupler is used to connect two PROFIBUS DP networks.
Data (0 to 244 bytes) is transmitted from the DP master of the first network to the
DP master of another network and vice versa.
The DP/DP coupler comes equipped with two independent DP interfaces that establish the
connection to the two DP networks. There is always one slave at the DP networks. The data
exchange between the two DP networks takes place by internal copying in the coupler.
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Description
2.2 Structure of PROFIBUS networks
DP/PA bus link for connection of PROFIBUS PA
The DP/PA bus link is the connection between PROFIBUS DP and PROFIBUS PA.
This means it connects the process control systems with the field devices of the
process automation.
The following components are available for a DP/PA bus link:
● DP/PA coupler Ex [ia]
● DP/PA coupler FDC 157-0
● Interface module IM 153-2 for establishing a DP/PA link.
● Active field distributor AFDiS for hazardous areas
Active components for the gateway between PROFIBUS and AS-Interface
● DP/AS-i LINK Advanced
The DP/AS-i LINK Advanced is PROFIBUS DPV1 slave (to IEC 61158-2 / EN 61158-2)
and AS-Interface master (to AS-Interface-specification V3.0 to EN 50295) and provides
transparent data access to AS-Interface from PROFIBUS DP.
PROFIBUS DP masters can cyclically exchange I/O data with the AS-Interface;
DP masters with acyclical services can also make AS-Interface master calls.
The DP/AS-i LINK Advanced is particularly suited for distributed configurations
and for the connection of a subordinate AS-Interface network.
The DP/AS-i LINK Advanced in the version as AS-Interface single master is completely
sufficient for applications with typical quantity structures.
For applications with high quantity structures, the DP/AS-i LINK Advanced is used as
AS-Interface double master. In this case, the duplicate quantity structures can be used
on two independently running AS-Interface strands.
● DP/AS-Interface Link 20E
The DP/AS-Interface Link 20E is PROFIBUS DP slave (in accordance with EN 61158)
and AS interface master (in accordance with AS interface specification V3.0 according to
EN 50295) and supports operation of the AS-Interface on PROFIBUS DP.
Single PROFIBUS masters can cyclically exchange I/O data with the AS interface;
masters with acyclical services can exchange I/O data and make master calls.
● DP/AS-i F-Link
The DP/AS-i F-Link is PROFIBUS DP-V1 slave (to EN 61158) and AS-i master
(to AS-Interface-specification V3.0 to EN 50295) and provides transparent data access
to AS-Interface from PROFIBUS DP. The DP/AS-i F-Link is also the only AS-i master that
can forward safety-oriented input data of ASIsafe slaves to a fail-safe CPU with
PROFIBUS DP master by means of the PROFIsafe protocol. An additional safety cabling
or monitoring is not required (especially no AS-Interface safety monitor). Depending on
the slave type, you can transmit binary values or analog values. All slaves to AS-Interface
specification V2.0, V2.1 or V3.0Als can be operated as AS-i slaves.
As fully adequate AS-i master to specification V3.0, you can use higher quantity
structures on the AS-i network (496 inputs and outputs each, up to 62 digital or analog
slaves).
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Description
2.2 Structure of PROFIBUS networks
Additional information
Information on the components is available in the Siemens Mall
(http://mall.automation.siemens.com).
Additional information is available in these manuals:
● PROFIBUS network manual
(http://support.automation.siemens.com/WW/view/en/35222591)
● Diagnostic repeater (http://support.automation.siemens.com/WW/view/en/7915183)
● DP/DP coupler (http://support.automation.siemens.com/WW/view/en/1179382)
● SIMATC NET Twisted-Pair and Fiber-Optic Networks
(http://support.automation.siemens.com/WW/view/en/8763736)
● Basics for installation of an Industrial Wireless LAN
(http://support.automation.siemens.com/WW/view/en/9975764)
● SIMATIC bus links, DP/PA coupler, active field distributors, DP/PA Link and Y Link
(http://support.automation.siemens.com/WW/view/en/1142696)
● Information on the CANopen module is available on the Internet
(http://www.hms-networks.com/can-for-et200s).
● DP/AS-INTERFACE LINK Advanced
(http://support.automation.siemens.com/WW/view/en/22502958/133300) manual
● DP/AS-i F-Link (http://support.automation.siemens.com/WW/view/en/24196041) manual
See also
Topology with RS485 repeater (Page 34)
OLM topology (Page 39)
WLAN topology (Page 39)
Connecting PROFIBUS to PROFINET (Page 40)
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Description
2.2 Structure of PROFIBUS networks
2.2.3.2
Network components in optical networks
Active network components
The following active network components are available for PROFIBUS in optical networks:
● Optical Link Module OLM
● Optical Bus Terminal OBT
Optical Link Module OLM
You can use the PROFIBUS Optical Link Modul OLM to install PROFIBUS networks in line,
star structure and redundant ring structure.
The transmission rate of a fiber-optic cable line does not depend on the distance
and can be 9.6 kbps to 12 Mbps.
Applications for OLM include, for example, plant buses on PROFIBUS base, networking
across buildings using glass fiber-optic cables, mixed networks with electrical and optical
segments, large networks (road tunnels, traffic guidance systems) and networks with high
demands on availability (redundant ring networks).
Optical Link modules can be combined by means of an RS485 interface and individual
devices or entire electrical segments can be integrated into the optical PROFIBUS network.
The following distances may not be exceeded between two OLMs regardless of the optical
power budget:
● OLM/P11, OLM/P12: 400 m
● OLM/G11, OLM/G12, OLM/G12-EEC: 3 km
● OLM/G11-1300, OLM/G12-1300: 15 km
Optical Bus Terminal OBT (optical bus terminal)
The Optical Bus Terminal connects an individual PROFIBUS device without integrated
optical interface or a PROFIBUS RS 485 segment with up to 31 devices to an optical
PROFIBUS.
An individual PROFIBUS DP device is connected with its RS 485 interface by means of a
PROFIBUS cable with integrated terminating resistor, for example, connecting cable 830-1T,
to the RS 485 interface of the OBT. The OBT is integrated into the optical line by means of
two optical interfaces.
The following optical transmission media can be connected to the OBT:
● Plastic fiber-optic cable up to 50 m single distance length.
They can be assembled on-site with two 2x2 Simplex connectors.
● PCF fiber-optic cable up to 300 m single distance length.
The cables are delivered pre-assembled.
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Description
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Additional information
Information on the components is available in the Siemens Mall
(http://mall.automation.siemens.com).
Additional information is available in these manuals:
● PROFIBUS network manual
(http://support.automation.siemens.com/WW/view/en/35222591)
● SIMATIC NET PROFIBUS, Optical Link Module
(http://support.automation.siemens.com/WW/view/de/56606534/0/en)
● SIMATC NET Twisted-Pair and Fiber-Optic Networks
(http://support.automation.siemens.com/WW/view/en/8763736)
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Description
2.2 Structure of PROFIBUS networks
2.2.4
Examples for topology
2.2.4.1
Topology with RS485 repeater
Configuration options with the RS485 repeater
You can operate the RS485 repeater in the following configurations:
6HJPHQW
Repeater
6HJPHQW
Figure 2-7
Segment 1 and segment 2 connected to RS485 repeater
6HJPHQW
Repeater
6HJPHQW
Figure 2-8
Segment 1 and segment 2 looped-through to RS485 repeater
6HJPHQW
Repeater
6HJPHQW
Figure 2-9
Segment 1 connected to RS485 repeater and segment 2 looped-through to
RS485 repeater
① Connect terminating resistor
② Do not connect terminating resistor
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Description
2.2 Structure of PROFIBUS networks
Configuration example
S7-300
HMI
&3831'3
ET 200S
ET 200SP
PG
HMI
Repeater
Repeater
Repeater
HMI
ET 200SP
HMI
Repeater
HMI
HMI
ET 200SP
ET 200S
Repeater
Figure 2-10
Configuration example with five RS485 repeaters
① Connect terminating resistor
② Do not connect terminating resistor
Maximum configuration
If you install a PROFIBUS network with RS485 repeaters, you may not connect more than
nine RS485 repeaters in series.
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Description
2.2 Structure of PROFIBUS networks
2.2.4.2
Topology with diagnostic repeater
Diagnostic repeater with three segments
You may not exceed the maximum permitted cable length of 100 m per segment that can
be monitored for the diagnostic repeater. The segments connected to DP2 and DP3 are
diagnostics-capable. The cable length that can be monitored is limited for some cable types.
Maximum cascade depth
You can connect up to nine diagnostic repeaters in series between any two
PROFIBUS stations.
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'3
'3
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Figure 2-11
Schematic layout of a PROFIBUS network with maximum possible cascade depth
at diagnostic repeaters
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Description
2.2 Structure of PROFIBUS networks
Example: Maximum cascade depth exceeded
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352),%86
'LDJQRVWLFUHSHDWHU
(763
(763
Figure 2-12
Maximum cascade depth exceeded
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Description
2.2 Structure of PROFIBUS networks
Layout with several segments
You can increase the number of used diagnostic repeaters by using several segments. The
example shows a layout in which the maximum cascade depth is exceeded at two segments.
&3831'3
(763
(763
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Figure 2-13
Layout with several segments, maximum cascade depth exceeded
Additional information
Additional information is available in the Diagnostic Repeater
(http://support.automation.siemens.com/WW/view/en/7915183) manual.
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Description
2.2 Structure of PROFIBUS networks
2.2.4.3
OLM topology
Combination of electrical and optical networks with OLM
Additional distances can be covered by means of the Optical Link Module.
Because bus cables across several buildings are particularly vulnerable to damage
caused by overvoltage (effect of lightning), the devices in the connected bus segment
must be protected against overvoltage.
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2/0
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2/0
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2SWLFDO
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Figure 2-14
2.2.4.4
%XLOGLQJ
Combination of electrical and optical networks
WLAN topology
IWLAN/PB Link PN IO as gateway between Industrial Wireless LAN and PROFIBUS
The IWLAN/PB Link PN IO supports the use of IWLAN and WLAN antennas for wireless
data transmission. This means the numerous PROFIBUS system services, for example,
diagnostic by bus, can be used throughout.
6&$/$1&(
:
352),%86
352),1(7
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,QGXVWULDO(WKHUQHW
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:
6&$/$1&(
:
Figure 2-15
PROFIBUS and WLAN
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Description
2.2 Structure of PROFIBUS networks
2.2.4.5
Connecting PROFIBUS to PROFINET
PROFIBUS can be integrated in PROFINET. In this way, you can set up any hybrid systems
consisting of fieldbus and Ethernet-based subsystems. This provides a continuous data
exchange.
Coupling of PROFIBUS and PROFINET
With a proxy-capable PROFINET device that is equipped with a PROFIBUS interface in
addition to a PROFINET interface, you can integrate existing PROFIBUS configurations
into the PROFINET configuration.
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6
3*3&
352),1(7,QGXVWULDO(WKHUQHW
,(3%
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Figure 2-16
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Connection of PROFIBUS and PROFINET with IE/PB link
PROFINET device with proxy functionality
The PROFINET device with proxy functionality is the substitute for a PROFIBUS device on
Ethernet. The proxy functionality allows a PROFIBUS device to communicate not only with
its master but also with all devices on PROFINET.
With PROFINET, existing PROFIBUS systems can be integrated into the PROFINET
communication with the aid of an IE/PB link. The IE/PB link PN IO then handles
communication via PROFINET on behalf of the PROFIBUS components.
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Parameter assignment/addressing
3
To set up an automation system, you will need to configure, assign parameters and link
the individual hardware components. The work needed for this is undertaken in the STEP 7
device, topology and network view.
Configuration
"Configuring" is understood to mean arranging, setting and networking devices and
modules within the device or network view.
A PROFIBUS address is automatically assigned to each module. The addresses can be
subsequently modified.
The CPU compares the preset configuration created in STEP 7 with the actual configuration
of the plant. Errors can be detected and signaled immediately this way.
The exact procedure for configuring devices is described in detail in the STEP 7 online help.
Parameter assignment
"Parameter assignment" is understood to mean setting the properties of the components
used. The settings for the hardware components and for data exchange are assigned, for
example, activating diagnostics, input delay with DI.
The parameters are downloaded into the CPU and transferred to the corresponding modules
when the CPU starts up. Modules can be replaced with ease because with SIMATIC CPUs
the set parameters are automatically downloaded into the new module during each startup.
Adjusting the hardware to the project requirements
You need to adapt the hardware if you want to set up, expand or change an automation
project. To do this, add hardware components to your layout, link them with existing
components, and adapt the hardware properties to the tasks.
The properties of the automation systems and modules are preset so that in many
cases you do not have to assign parameters again.
But parameter assignment is required in the following cases:
● You want to change the preset parameters of a module.
● You want to use special functions.
● You want to configure communication connections.
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Parameter assignment/addressing
3.1 Assigning the DP slave to a DP master
Basic procedure for creating a PROFIBUS DP system
● Configuration
– Creating PROFIBUS devices and modules in STEP 7
– Assigning the DP slave to a DP master (Page 42)
● Optional: Parameter assignment
– Assigning the PROFIBUS address (Page 44)
– Making network settings (Page 45)
– Considering cable configuration (Page 48)
– Considering additional network devices (Page 50)
– Bus parameters – creating a user-defined profile (Page 51)
– Configuring constant bus cycle time (Page 54)
3.1
Assigning the DP slave to a DP master
PROFIBUS DP system
A PROFIBUS DP system consists of a PROFIBUS DP master and its assigned
PROFIBUS DP slaves. Once the devices have been placed in the network view or device
view, STEP 7 assigns default parameter values to them. Initially, you only have to assign
the DP slaves to one DP master.
Requirement
● The network view of STEP 7 is open.
● A CPU has been placed (e.g., CPU 1516-3 PN/DP).
● A DP slave has been placed (e.g., IM151-1 HF).
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Parameter assignment/addressing
3.1 Assigning the DP slave to a DP master
Procedure
To assign DP slaves to a DP master, follow these steps:
1. On the DP slave, use the left mouse button to click on the "Not assigned" link.
The "Select DP master" menu opens.
2. Select the DP master in the menu to which you want to assign the DP slave.
Result: A subnet with a DP system is created on the CPU. The CPU is now the
PROFIBUS DP master. The DP slave is assigned to the DP master.
3. Repeat steps 1 and 2 for all other DP slaves that you want to assign to the DP master.
Figure 3-1
Assigning the DP slave to a DP master
Network overview
You can check the communication relationships of the activated interface in the network
overview. The network overview is context-sensitive for selection in the network view:
● The selection of the CPU shows the DP communication of the CPU.
● The selection of the station shows the communication of the entire station.
● The selection of the interface shows the DP communication of the interface.
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3.2 PROFIBUS address
3.2
PROFIBUS address
Devices can be connected to the PROFIBUS subnet that communicate by means
of configured connections or that are part of a PROFIBUS DP master system.
If the DP slave has already been assigned to a DP master, the PROFIBUS subnet
to which the device is connected is automatically displayed under "Interface linked with".
In the Inspector window under "PROFIBUS", select the subnet to which the interface is
linked or add a new subnet.
All devices of a subnet must have different PROFIBUS addresses.
Figure 3-2
PROFIBUS address
Rules for address assignment
STEP 7 automatically assigns device addresses.
You can change the addresses if you observe the following points:
● Assign a unique PROFIBUS address to each device in the PROFIBUS network,
each DP master and each DP slave in the PROFIBUS network.
● Depending on the DP slave, not all permitted PROFIBUS addresses are supported.
For devices with BCD switches, it is often the case that only the PROFIBUS
addresses 1 to 99 are supported.
Changing the PROFIBUS address
You change the PROFIBUS address under "Parameter".
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3.3 Network settings
3.3
Network settings
Highest PROFIBUS address (HSA)
Outputs the highest PROFIBUS address of an active device. PROFIBUS addresses
greater than HSA are permitted for passive devices, but only up to 126.
Profile
Depending on the connected device types and the protocols used, different profiles are
available on the PROFIBUS. The profiles differ with respect to their setting options and
calculation of the bus parameters.
The PROFIBUS subnet will only work properly if the bus parameters of all devices have
the same values.
Figure 3-3
Network settings
Profiles and transmission rates
Table 3- 1
Profiles and transmission rates
Profiles
Supported transmission rates
DP
9.6 kbps to 12 Mbps
Standard
9.6 kbps to 12 Mbps
Universal (DP/FMS)
(FMS is not supported)
9.6 kbps to 1.5 Mbps
User-defined
9.6 kbps to 12 Mbps
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3.3 Network settings
DP (recommended profile)
Select the "DP" profile if only devices meeting the requirements of the standard
EN 61158-6-3 are connected to the PROFIBUS subnet. The setting of the bus parameters
has been optimized for these devices. These include devices with DP master and DP slave
interfaces of SIMATIC S7 as well as distributed I/O devices from third parties.
Note
Profile for constant bus cycle time and isochronous mode
DP is the recommended profile for the configuration of constant bus cycle time and
isochronous mode.
Standard
Compared with the "DP" profile, the "Standard" profile gives you the option to take into
consideration devices of another project or devices that have not been configured here for
calculation of the bus parameters. The bus parameters are then calculated with a simple
algorithm that was not optimized.
Universal (DP/FMS) (FMS is not supported)
Select the "Universal (DP/FMS)" profile if individual devices in the PROFIBUS subnet
use the FMS service (e.g., CP 343-5, PROFIBUS FMS devices).
As with the "Standard" profile, here, too, you have the option to take additional devices
into consideration for calculation of the bus parameters.
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3.3 Network settings
User-defined
The PROFIBUS subnet will only work properly if the parameters for the profile have been
synchronized. Select the "User-defined" profile if none of the other profiles "match" for
operation of a PROFIBUS device and if you have to adapt the bus parameters for your
special layout.
You cannot configure all theoretically possible combinations with the user-defined profile
either. The PROFIBUS standard prescribes some parameter limits depending on other
parameters. It is, for example, not permitted that a responder responds (Min Tsdr) before
the initiator is able to receive the frame (Trdy). These standard specifications are also
checked in the "User-defined" profile.
Note
User-defined settings
Use user-defined settings only if you are familiar with the PROFIBUS parameters.
It is usually better to work with the "DP" profile.
Contact Customer Support (Page 79) if you have any questions.
The bus parameters that were last valid on the PROFIBUS subnet are automatically set
as user-defined. If the "DP" bus profile was valid for the subnet, for example, the bus
parameters for "DP" are set in the "User-defined" bus profile. You can modify the parameters
based on these settings.
The monitoring times are not automatically recalculated in the "User-defined settings"
setting so that the uniformity of the set values is not changed without your knowledge,
for example, to configure other configuration tools.
You can calculate the monitoring times Ttr and watchdog based on the parameters
you have set. To do so, click on the "Recalculate" button.
See also
Additional network stations (Page 50)
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3.4 Cable configuration
3.4
Cable configuration
Considering cable configuration
Information on the cable configuration can be taken into consideration for calculation of
the bus parameters. To do so, select the check box "Consider following cable configuration"
in the properties of the PROFIBUS subnet.
The other information depends on the type of cable used.
Figure 3-4
Cable configuration
Cable configuration: Fiber-optic cables / optical ring
The calculation depends on the used OLM types. Select the corresponding check box.
Multiple selections are possible.
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3.4 Cable configuration
Adapt bus parameters in the optical ring
With the layout as ring, there is a kind of redundancy because you have the option to
address all devices using the ring structure even if the connection to other devices is
interrupted.
The following configuration conditions must be met in the optical ring:
● A free address below HSA (Highest Station Address)
● Increasing the retry value to at least 3
(Network settings: user-defined profile)
● Checking and adapting the slot time
(Network settings: user-defined profile; bus parameters: Tslot parameter:
You need short slot time values for OLM / P12, median slot time values for OLM / G12
and OLM / G12-EEC and high slot time values for OLM / G12-1300. This results in a high
performance for small networks and a medium to low performance with medium to large
networks.
Additional information
Additional information on adaptation of the retry value and the slot time is available in the
PROFIBUS network manual
(http://support.automation.siemens.com/WW/view/en/35222591).
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3.5 Additional network stations
3.5
Additional network stations
Communication load - considering additional network stations
The bus parameters depend on the communication volume of the active network stations.
There are differences between cyclical communication (DP) and connection-oriented,
acyclical communication (S7 communication, Send/Receive (FDL)). Contrary to DP,
the number and size of the communication jobs (communication load) depends on the user
program. This means the communication load cannot always be determined automatically.
If you select the check box "Consider the following network stations", you can consider
network stations in the calculation of the bus times that were not configured in the project.
Figure 3-5
Additional network stations
Calculating the bus times
You can specify a network configuration in the parameter group "Additional network stations"
for calculation of the bus times that deviates from the configured network configuration.
The network configuration is available for the following profiles:
● Standard
● Universal (DP/FMS)
● User-defined
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3.6 Bus parameters
Quantification of the communication load
The following settings are possible to take the communication load into consideration:
● Number of network stations that are not configured
● Information on the communication load from the user programs for FDL or
S7 communication. You can choose from the following levels:
– Low: Typical for DP, no larger data communication except DP.
– Medium: Typical for mixed operation of DP and other communication services
(e.g., S7 communication), if DP has high time requirements and with medium,
acyclical communication volume.
– High: For mixed operation of DP and other communication services
(e.g., S7 communication), if DP has low time requirements and with high,
acyclical communication volume.
3.6
Bus parameters
Introduction
Bus parameters control the transmission behavior on the bus.
Each device on the bus must correspond with the bus parameters of other devices.
Note
The PROFIBUS subnet will only work properly if the parameters for the bus profile have
been synchronized. Change the preset values only if you are familiar with the parameter
assignment of the bus profile for PROFIBUS.
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3.6 Bus parameters
Cyclical distribution of the bus parameters
If the check box "Activate cyclical distribution of bus parameters" is selected under
"Bus parameters" with the selected PROFIBUS subnet in the Inspector window, the bus
parameters are sent cyclically during operation by the modules that support this function.
This way you can, for example, connect a programming device to the PROFIBUS during
operation.
Disable this function in the following cases:
● In constant bus cycle time mode to minimize the bus cycle.
● If third-party devices are connected in the PROFIBUS subnet whose protocol uses
the DSAP 63 (Destination Service Access Point) for multicast.
Figure 3-6
Bus parameters
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3.6 Bus parameters
Bus parameters for the bus profile of PROFIBUS subnets
Note
Display of offline values
The offline values of the bus parameters are always displayed even if they are connected
online with the target system.
Table 3- 2
Bus parameters - value ranges
Bus parameters
Adjustable 1
Limit values
Tslot_Init
Yes
Max. Tsdr + 15 <= Tslot_Init <= 16.383 t_Bit
Max. Tsdr
Yes
35 + 2*Tset + Tqui <= Max. Tsdr <= 1,023 t_Bit
Min. Tsdr
Yes
11 t_Bit <= Min. Tsdr <= MIN(255 t_Bit, ...
Tset
Yes
... Max. Tsdr - 1, 34 + 2*Tset + Tqui)
Tqui
Yes
0 t_bit <= Tqui <= MIN(31 t_bit, Min. Tsdr - 1)
GAP factor
Yes
1 <= GAP factor <= 100
Retry limit
Yes
1 <= Retry limit <= 15
Tslot ( slot time)
No
-
Tid2
No
Tid2 = Max. Tsdr
Trdy
No
Trdy = Min. Tsdr
Tid1
No
Tid1 = 35 + 2*Tset + Tqui
Ttr (Target Rotation Time)
Yes
256 t_Bit <= Ttr <= 16,777,960 t_bit
Ttr typical
No
This time is for information only and is not transmitted
to the devices.
Watchdog
1
1 t_bit <= Tset <= 494 t_bit
10 ms <= Watchdog <= 650 s
depending on bus profile
User-defined bus profile
Use the following settings to create a user-defined bus profile:
● minimum Target Rotation Time (Ttr) = 5000x HSA
(highest PROFIBUS address of an active device)
● minimum watchdog (Watchdog) = 6250x HSA
Recalculate
Use the button "Recalculate" to recalculate the parameters.
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3.7 Constant bus cycle time
3.7
Constant bus cycle time
Constant bus cycle time
The DP master addresses its assigned DP slaves cyclically. S7 communication may cause
the intervals to vary. You can enable a "bus cycle with constant bus cycle time" to achieve
identical intervals. This ensures data transmission at the same (constant bus cycle time)
intervals.
Figure 3-7
Enabling a bus cycle with constant bus cycle time
Number of OPs/PGs/TDs at the PROFIBUS
Here you enter the number of devices that are not configured.
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3.7 Constant bus cycle time
Increasing DP cycle time manually
The following situation can occur especially with very short DP cycle times:
The runtime of the user program is greater than the shortest cycle
(see Technical specifications of the CPU, section "Isochronous mode").
You have to manually increase the automatically calculated DP cycle time in this case.
See also
Configuring isochronous mode (Page 66)
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3.7 Constant bus cycle time
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Diagnostics
4.1
4
Overview
Diagnostic options
In case of an error you can determine the current status of your automation system
and react specifically by using the event-related diagnostics and the evaluation of interrupts.
You can use the following options for diagnostics of the PROFIBUS components:
● Determine the status of the system using the Lifelist in STEP 7.
● Evaluate the module status, error and message texts by using the display of the
S7-1500 CPU.
● Run cable diagnostics during operation by means of the diagnostic repeater.
● Evaluate the diagnostics and interrupt behavior in isochronous mode. (Page 69)
● Determine status information for fault localization and fault rectification by using the
DP/PA coupler FDC 157-0 configured as PROFIBUS diagnostic slave.
Additional information
Additional information on diagnostics is available in these manuals:
● In the Diagnostic repeater for PROFIBUS-DP
(http://support.automation.siemens.com/WW/view/en/7915183) manual for diagnostics
with STEP 7, diagnostics in the user program, monitoring function isochronous
PROFIBUS, topology display in STEP 7.
● In the System diagnostics
(http://support.automation.siemens.com/WW/view/en/59192926) system manual for
diagnostic options that are available for the automation systems S7-1500, ET 200MP
and ET 200SP.
● In the PROFIBUS (http://support.automation.siemens.com/WW/view/en/35222591)
network manual for diagnostics of fiber-optic cables.
● In the DP/PA coupler, active field distributors, DP/PA Link and Y Link
(http://support.automation.siemens.com/WW/view/en/1142696) manual.
● In the Web server (http://support.automation.siemens.com/WW/view/en/59193560)
manual for diagnostic options (depending on the functionality of the CPU).
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Diagnostics
4.2 Diagnostics using the display of the S7-1500
4.2
Diagnostics using the display of the S7-1500
Displays
Each CPU in the S7-1500 automation system has a front cover with a display and operating
buttons. Control and status information is displayed in different menus on the display.
You use the operating buttons to navigate through the menus.
The following states can be evaluated on the display:
● Module status for central and distributed modules
● Error and alarm texts (system diagnostics, user-defined alarms)
Module status
From the station overview you go to the module status for a distributed module via the
module overview.
Figure 4-1
Example: Station overview, module overview, module status
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4.3 Diagnostics with the diagnostic repeater
Error and alarm texts
Figure 4-2
Example: Diagnostic buffer, alarms
Additional information
Additional information on the topic "Functions and operation of the display" is available
in the documentation for the S7-1500 automation system on the Internet
(http://support.automation.siemens.com/WW/view/en/59191792).
4.3
Diagnostics with the diagnostic repeater
Introduction
The diagnostic repeater is a repeater that can monitor two segments of a RS485-PROFIBUS
subnet (copper cable) during operation and signal cable faults to the DP master by sending a
diagnostic frame. Fault location and the cause of the fault can be displayed in plain text by
means of STEP 7 as well as operator control and monitoring devices (SIMATIC HMI).
With its cable diagnostics during operation, the diagnostic repeater allows you to detect and
localize cable faults early on. This means plant faults are detected early and plant downtimes
can be prevented.
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Diagnostics
4.4 I&M data (Identification and Maintenance)
Diagnostic functions
● The diagnostic function provides the location and the cause of cable faults,
such as wire break or missing terminating resistors. The fault location is specified
relative to the devices present, for example "Break on signal line A and/or B".
● Reading out the saved diagnostic and statistical information.
● Monitoring of the isochronous PROFIBUS, e.g., violation of cycle time.
● Providing identification data.
Additional information
Additional information on diagnostics with STEP 7 and for reading out the diagnostics
with the user program is available in the Diagnostic repeater for PROFIBUS DP
(http://support.automation.siemens.com/WW/view/en/7915183) manual.
4.4
I&M data (Identification and Maintenance)
Definition and properties
Identification and maintenance data (I&M) is information saved in a module
to provide support when:
● Checking the plant configuration
● Locating hardware changes in a plant
Identification data (I data) is module information (some of which may be printed on the
module housing) such as the order and serial number. I data is read-only, vendor-specific
module information.
Maintenance data (M data) is system-specific information such as the installation location
and date. M data is generated in the course of configuration and is written to the module
memory.
The modules can be uniquely identified in online mode by means of the I&M data.
Additional information
Information if and to what extent a DP device supports I&M data is available
in the respective device manual of the device.
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Functions
5.1
Isochronous mode
5.1.1
What is isochronous mode?
Why isochronous mode?
Assuming public transport were to operate at maximum speed while reducing stop times
at the passenger terminals to absolute minimum, the last thing many potential passengers
would notice of the departing contraption are its red tail lights. The overall travel time is,
however, decided by the train, bus or underground clock, because well adjusted timing is
essential to a good service. This also applies to distributed automation engineering. Not only
fast cycles but also the adaptation and synchronization of the individual cycles result in
optimum throughput.
Just-In-Time
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The high speed and reliable reaction time of a system operating in isochronous mode
is based on the fact that all data is provided just-in-time. The constant bus cycle time
PROFIBUS DP cycle beats the time here.
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Functions
5.1 Isochronous mode
Advantages of isochronous mode
The use of isochronous mode provides:
● Optimized controls
● Determinism
● Consistent (simultaneous) reading of input data
● Consistent (simultaneous) output of output data
5.1.2
Use of isochronous mode
The system property "isochronous mode" enables recording of measured values and
process data in a defined system cycle. Signal processing takes place in the same system
cycle all the way to switching to the "output terminal". This means isochronous mode
improves the control quality and provides greater manufacturing precision. Isochronous
mode drastically reduces the possible fluctuations of process response times. The timeassured processing can be used for a higher machine cycle.
Isochronous mode is basically always the choice when acquisition of measured values
needs to be synchronized, movements need to be coordinated and process reactions need
to be defined and take place simultaneously. This means the areas of applications for
isochronous mode are manifold.
5.1.3
Isochronous applications
Example: Isochronous measurement at several measuring points
QC requires precise measurement of dimensions within a camshaft production process.
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Functions
5.1 Isochronous mode
Isochronous workflow
By using the system property "isochronous mode" and the associated simultaneous
measured value acquisition, measurement can be performed continuously and the time
required for measurement is reduced. Resultant workflow:
● Continuous turning of the camshaft.
● During the continuous turning, measure the positions and cam excursion synchronously.
● Process the next camshaft.
All camshaft positions and the corresponding measured values (red) are measured
synchronously within a single rotation of the camshaft. This increases machine output
and maintains or enhances precision of the measurement.
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5.1 Isochronous mode
5.1.4
Sequence of synchronization
From reading of input data to output of output data
The sequence of all components involved in the synchronization is explained
in the paragraphs below:
● Isochronous reading of input data
● Transport of input data by means of the PROFIBUS subnet to the DP master (CPU)
● Further processing in the isochronous application of the CPU
● Transport of output data by means of the PROFIBUS subnet to the output DP slave
● Isochronous output of output data
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TI
Time for reading the input data
TO
Time for output of output data
Figure 5-3
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Time sequence of synchronization
To ensure that all input data is ready for transportation via the PROFIBUS DP line when the
next PROFIBUS DP cycle begins, the I/O read cycle has a lead time TI so that it starts
earlier. The TI is the "flash gun" for all inputs. This TI is necessary to compensate for analog
to digital conversion, backplane bus times, etc. The lead time TI can be configured by
STEP 7 or by the user. We recommend that you have TI assigned automatically by STEP 7.
The PROFIBUS DP line transports the input data to the DP master. The synchronous cycle
interrupt OB SynchronousCycle is called. The user program in the synchronous cycle
interrupt OB decides the process reaction and provides the output data in time for the start of
the next data cycle. The length of the data cycle is always configured by the user.
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Functions
5.1 Isochronous mode
To is the compensation from the backplane bus and the digital to analog conversion within
the slave. The To is the "flash gun" for all outputs. The time To can be configured by STEP 7
or by the user. We recommend that you have To assigned automatically by STEP 7.
Without isochronous mode, application, data transmission and field devices have their own,
unsynchronized processing cycles; these result in a higher total cycle time with high jitter.
With isochronous mode, application, data transmission and field device are synchronized
resulting in a minimum total cycle with minimum jitter.
Isochronous mode and non isochronous mode distributed I/O
It is possible to combine isochronous mode distributed I/O with non isochronous mode
distributed I/O on one DP master.
5.1.5
Requirements for configuration
Note the following requirements for configuration of isochronous mode:
● Isochronous mode cannot be used in optical PROFIBUS networks.
● Constant bus cycle time and isochronous mode are only possible with the bus profiles
"DP" and "User-defined".
● Isochronous mode is only possible with the DP interfaces integrated in the CPU.
Isochronous mode with CPs for PROFIBUS is not possible.
● Only the constant bus cycle time master is permitted as active station on the isochronous
PROFIBUS DP. OPs and PGs (for example, PCs with PG functionality) influence the time
behavior of the isochronous DP cycle and are therefore not permitted.
● Isochronous mode is not permitted across lines.
● Isochronous I/O can only be processed in process image partitions. Isochronous
consistent data transmission is not possible without the use of process image partitions.
The adherence to quantity structures is monitored because the number of slaves and
bytes on the DP master system is limited for each process image partition.
● The addresses of isochronous modules must be located in a process image partition.
● Full isochronous mode from "terminal" to "terminal" is only possible if all components
involved in the chain support the system property "isochronous mode".
Make sure you look for the entry "Isochronous mode" or "Isochronous processing"
in the information box of the module when you select it in the catalog.
● When you configure isochronous mode, you may not assign a SYNC/FREEZE group
to the slave.
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5.1 Isochronous mode
5.1.6
Configuring isochronous mode
Introduction
A SIMATIC automation solution can be connected to the isochronous PROFIBUS with the
isochronous mode function. Isochronous mode guarantees the synchronous reading of input
data, the processing and output of output data at the same (isochronous) intervals.
Basic procedure for configuration of isochronous mode
1. Setting the properties for isochronous mode on the DP slave:
– Isochronous DP cycle
– Isochronous mode of the modules
2. Setting the properties for isochronous mode on the modules:
– Synchronous cycle interrupt (SynchronousCycle)
– Process image partition
– Input delay
3. Create user program with access to isochronous I/O
Requirement
● The network view in STEP 7 is open.
● A S7-1500 CPU has been placed (e.g., CPU 1516-3 PN/DP).
● An interface module has been placed and networked with the CPU (e.g., IM 151-1 HF).
● I/O modules have been placed (e.g., 2DI x DC24V HF and 2DO x DC24V/0,5A HF).
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5.1 Isochronous mode
Configuring isochronous mode on the DP slave
1. Select the DP slave in the network view and navigate to the "isochronous mode"
area in the Inspector window.
2. Enable the option for synchronization to the DP cycle for the DP slave.
Default: The DP slaves get the Ti/To values from the subnet which means the values
are automatically the same for all DP slaves of the DP master system.
3. Enable the "Isochronous mode" option the the "Detail view" for all I/O modules you
want to operate in isochronous mode.
4. Repeat steps 1 and 3 for all DP slaves that you want to operate in isochronous mode.
Figure 5-4
Configuring isochronous mode on the DP slave
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5.1 Isochronous mode
Configuring synchronous cycle interrupt on the I/O module
1. Select an I/O module in the device view and navigate to the "I/O addresses"
area in the Inspector window.
– The option for isochronous mode is selected.
2. Select the synchronous cycle interrupt in the drop-down list.
Figure 5-5
I/O addresses - creating the synchronous cycle interrupt OB
3. Assign the process image partition configured in the CPU.
Figure 5-6
I/O addresses - assigning process image partitions
4. Repeat steps 1 and 3 for all I/O modules that you want to operate in isochronous mode.
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5.1 Isochronous mode
Programming isochronous mode
To operate your plant in isochronous mode, the user program must be structured
accordingly. This means you have to add a synchronous cycle interrupt in the STEP 7
project tree.
You access the isochronous I/O by means of a process image partition, which means the
addresses of the isochronous modules must be located in a process image partition. You
program access to isochronous I/O with the SYNC_PI instructions (updating the process
image partitions of the inputs) and SYNC_PO (updating the process image partition of the
outputs) in the synchronous cycle interrupt OB.
You call the SYNC_PI instruction at the start of the synchronous cycle interrupt OB,
provided you have selected the automatic setting for the delay time. You call the SYNC_PO
instruction at the end of the synchronous cycle interrupt OB.
5.1.7
Diagnostics and interrupt functions
The diagnostic and interrupt functions of STEP 7 are available for isochronous mode.
These reduce downtimes and simplify localization and elimination of faults.
Events, causes of errors and remedies
Below, you will find the events for diagnostic and interrupt functions and remedies
for the problem.
Table 5- 1
Events, causes of errors and remedies
Event
Cause of the error
Remedy
Synchronous cycle interrupt OB is
started with the input parameter
EventCount > 0 (number of lost OB
calls since last OB call)
If configured:
The synchronous cycle interrupt OB
takes too long.
•
Shorten the synchronous cycle
interrupt OB.
•
Increase the DP cycle.
•
Reduce the delay time setting
(setting with isochronous mode at
synchronous cycle interrupt OB).
•
Increase the delay time.
•
Increase the DP cycle.
•
Adapt the program.
•
•
Call of the time error OB
•
Diagnostic buffer entry "Buffer
overflow for OB6x events"
Error (negative RetVals) when updating SYNC_PI / SYNC_PO are not called in
the isochronous process image
the permitted access window in the
partition with SYNC_PI / SYNC_PO:
synchronous cycle interrupt OB, which
means they are called or processed
• Consistency warning
during the I/O data transfer on
• Update time is after / before the
PROFIBUS.
permitted access window.
Error when updating the isochronous
process image partition with
SYNC_PI / SYNC_PO:
•
DP slave / module does not respond /
is not available.
Access error
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Functions
5.1 Isochronous mode
5.1.8
Parameter settings for isochronous mode
Parameter changes as task of the field service technician
The task of a field service technician is to maintain the production process.
In this context the technician has to detect, localize and eliminate errors and performance
losses of isochronous mode.
All parameters which influence isochronous mode can be checked and configured using
the "Isochronous mode" dialog box.
Parameters should only be changed by experienced users or service technicians.
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Functions
5.1 Isochronous mode
5.1.8.1
Viewing isochronous mode parameters
"Isochronous mode" dialog box
1. Select "Properties > Isochronous mode" in the Inspector window.
The "isochronous mode" dialog box opens with an overview of parameters which
influence isochronous mode.
Information on the individual parameters is available under "Detail overview".
2. Compare the values shown with the values in the documentation, or with the
value specified by a technician.
Figure 5-7
Viewing parameters for isochronous mode
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Functions
5.1 Isochronous mode
5.1.8.2
Change parameters
Changing parameters for the DP master system
You can change the parameters for isochronous mode in the "Constant bus cycle time"
dialog box.
1. Select the DP master system in the network view.
2. Select the section "Constant bus cycle time" in the Inspector window.
3. Change the parameters according to the received instructions.
Figure 5-8
Changing parameters for the DP master system
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Functions
5.1 Isochronous mode
Adapting the input delay
1. Select the input module in the device view.
2. Select the section "Inputs" in the Inspector window.
3. Adapt the input delay.
Figure 5-9
Adapting the input delay
Compile, load and save the changed configuration
1. Put the plant out of operation.
2. Select the CPU in the project navigator.
3. Select "Compile > Hardware" in the shortcut menu.
4. Select "Download to device" in the shortcut menu.
5. Save the project.
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Functions
5.2 Acyclical data exchange
5.2
Acyclical data exchange
Additional functionality with DPV1 devices (DP master / DP slaves)
DP masters and DP slaves that support DPV1 have the following additional functions
compared to the devices that support only DPV0:
● The acyclical data exchange between master and slave is supported.
● Interrupts can be set by a DPV1 slave which ensures treatment of the interrupt-triggering
event in the master CPU.
Acyclical data exchange
Read/write data record, for example, to change the parameters of a slave during operation.
The data records of a module and the structure of these data records is available in the
documentation for the respective module.
The table below includes the instructions with their functions for access to DPV1 slaves.
Detailed information is available in the STEP 7 online help.
Table 5- 2
Instructions for access to DPV1 slaves
Instructions
Function (DPV1)
RDREC
Read data record
WRREC
Write data record
RALRM
Receive interrupt from a DP slave.
(The instruction must be called in the OB that triggers the interrupt.)
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Functions
5.3 SYNC/FREEZE groups
5.3
SYNC/FREEZE groups
Assigning the SYNC/FREEZE group to the DP slave
A DP master with the corresponding functionality can send the control commands
SYNC and/or FREEZE for synchronization of the DP slaves simultaneously to a group
of DP slaves. You must assign SYNC/FREEZE groups to the DP slaves for this purpose.
Requirement: A DP master system has been created in the project.
Procedure
To assign a DP slave to a SYNC/FREEZE group, follow these steps:
1. Select the DP interface of the DP slave you want to assign to a group in the
device view or network view.
2. Select the check boxes for the required SYNC/FREEZE groups under the group
"SYNC/FREEZE" in the Inspector window.
You can assign each DP slave to only one SYNC/FREEZE group.
Figure 5-10
Assigning the DP slave to a SYNC/FREEZE group
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Functions
5.3 SYNC/FREEZE groups
Important information on the control commands SYNC and FREEZE
You can use the control commands SYNC and FREEZE in the DP master to synchronize the
DP slaves event-controlled. The DP master sends the control commands simultaneously to a
group of DP slaves in its master system. It does not take into consideration DP slaves that
have failed or are currently sending diagnostic information.
Requirement for synchronization using control commands is that you have assigned the
DP slaves to SYNC/FREEZE groups.
For a S7 CPU use the instruction DPSYC_FR (SFC 11) to synchronize the DP slaves.
When you select the DP master, you see a list of the eight SYNC/FREEZE groups under
"Properties > DP interface > SYNC/FREEZE" in the Inspector window.
Figure 5-11
SYNC/FREEZE groups on DP master
SYNC control command
The DP master uses the SYNC control command to cause a group of DP slaves to freeze
the states of their outputs to the current value.
The DP slaves save the output data of the DP master for the following frames.
But the states of the DP slave outputs remain unchanged.
Only after each new SYNC control command does the DP slave set its outputs
to the values that it has saved as the output data of the DP master.
The outputs are not updated cyclically again until the DP master has sent a
UNSYNC control command.
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Functions
5.4 Interrupts
FREEZE control command
After receiving the FREEZE control command from the DP master, the DP slaves of a group
freeze the current status of their inputs. The DP slaves send these frozen input data to the
DP master with the following cyclical frames.
The DP slaves freeze the current state of their inputs again after each new FREEZE control
command.
The state of the DP slave inputs is only send to the DP master cyclically again when the
DP master sends the UNFREEZE control command.
5.4
Interrupts
Interrupts and interrupt OBs for DPV1
Interrupts can be set by a DPV1 slave which ensures treatment of the interrupt-triggering
event in the master CPU. The interrupt data is evaluated in the CPU even in the "STOP"
operating mode and the diagnostic buffer and the module state are updated.
The OB is not processed in STOP.
The following DPV1 interrupts are supported:
● Status interrupt
● Update interrupt
● Vendor-specific interrupt
Detailed information is available in the descriptions on the OBs. You can use the
corresponding OBs for diagnostic interrupts, process interrupts, pull/insert interrupts
that are provided by the operating system of the S7-CPUs.
OB 55 interrupt - Status interrupt
The status interrupt can be triggered when the operating mode of a device or module
changes, for example, from RUN to STOP.
OB 56 interrupt - Update interrupt
An update interrupt can be triggered if the parameters of a slot were changed.
This may be caused by local access or partner access to the parameters.
OB 57 interrupt - Vendor-specific interrupt
The event that triggers the vendor-specific interrupt can be specified by the manufacturer
of a DPV1 slave.
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Functions
5.4 Interrupts
Additional information
A detailed description of the events at which interrupts are triggered is available in the
documentation of the respective manufacturer of the DPV1 slave.
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Service & Support
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The unmatched complete service for the entire life cycle
For machine constructors, solution providers and plant operators: The service offering from
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Online Support
The comprehensive online information platform supports you in all aspects of our
Service & Support at any time and from any location in the world.
You can find Online Support on the Internet at the following address: Internet
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Support in planning and designing your project: From detailed actual-state analysis,
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Optimization
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To help you achieve this potential, we are offering a complete range of optimization services.
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You can also rely on our support when it comes to modernization –
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Our service programs are selected service packages for an automation and drives system
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Glossary
Automation system
Programmable logic controller for the open-loop and closed-loop control of process chains
of the process engineering industry and manufacturing technology. The automation system
consists of different components and integrated system functions according to the
automation task.
Bus
A common transfer route to which all nodes are connected; it has two defined ends.
In the case of PROFIBUS, the bus is a two-wire line or a fiber-optic cable.
Bus connector
Physical connection between the node and bus cable.
Bus system
All stations physically connected to a bus cable form a bus system.
Device
In the PROFIBUS environment, "device" is the generic term for:
● Automation systems (for example, PLC, PC)
● Distributed I/O systems
● Field devices (for example, hydraulic devices, pneumatic devices)
● Active network components
● Gateways to AS interface or other fieldbus systems
Device that can send, receive or amplify data via the bus, for example,
a DP slave by means of PROFIBUS DP.
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Glossary
Device
In the PROFIBUS environment, "device" is the generic term for:
● Automation systems (for example, PLC, PC)
● Distributed I/O systems
● Field devices (for example, hydraulic devices, pneumatic devices)
● Active network components
● Gateways to AS interface or other fieldbus systems
Device that can send, receive or amplify data via the bus,
for example, a DP slave by means of PROFIBUS DP.
Diagnostics
Monitoring functions for the recognition, localization, classification, display and further
evaluation of errors, faults and alarms. They run automatically during plant operation.
This increases the availability of plants because commissioning times and downtimes
are reduced.
DP master
CPU or device that conducts the communication with the DP slaves according to a defined
algorithm. To do this, the DP master uses the functions for communication with the
DP slaves which are defined by PROFIBUS DP. It acts according to standard EN 50170,
part 3.
See also Master
DP slave
Slave in the distributed I/O that is operated on the PROFIBUS with PROFIBUS DP protocol
and acts according to standard EN 50170, part 3. It is addressed by the DP master and
provides it with specified functions (I/O data, diagnostics, etc.).
See also Slave
DPV1
The designation DPV1 refers to the functional extension of acyclic services
(to include new interrupts, for example) provided by the DP protocol. The DPV1
functionality is integrated in IEC 61158/EN 50170, volume 2, PROFIBUS.
FDL
Fieldbus Data Link (bus access protocol). Step 2 with PROFIBUS.
HMI device
Human Machine Interface, device for visualization and control of automation processes
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Glossary
HSA
Highest Station Address. A bus parameter for PROFIBUS. Outputs the highest PROFIBUS
address of an active device. PROFIBUS addresses greater than HSA are permitted for
passive devices, up to 126.
Industrial Ethernet
Guideline for establishing an Ethernet in an industrial environment. The major difference
to the standard Ethernet is the mechanical loading capacity and noise immunity of the
individual components.
I-slave
The "I-slave" functionality of a CPU supports the exchange of data with a DP master
and can thus be used, for example, as intelligent preprocessing unit of partial processes.
The I-slave is connected in its role as DP slave to a "higher-level" DP master.
Master
A master device that is in possession of the token can send data to other devices and
request data from them (= active device).
PCF
Polymer Cladded Fiber (plastic-covered glass fiber)
POF
Polymer Optical Fiber (plastic fiber-optic cable made of light-conducting plastics)
Process image
Address area in the system memory of the DP master. At the start of cyclic program
execution, the signal states of the input modules are transmitted to the process image
of the inputs. And the end of cyclic program execution, the process image of the outputs
is transmitted to the DP slave as signal state.
PROFIBUS
PROcess Field BUS, in IEC 61158-2 as "Type 3" standardized, bit-serial fieldbus system.
The standard specifies functional, electrical and mechanical properties.
PROFIBUS is a bus system that networks automation systems and field devices compatible
with PROFIBUS at the cell and field level. PROFIBUS is available with the protocols DP
(= distributed periphery), FMS (= fieldbus message specification) or PA
(process automation).
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Glossary
PROFIBUS address
Unique identification of a device connected to PROFIBUS. The PROFIBUS address is
transmitted in the frame for addressing a device. A PC or programming device has the
PROFIBUS address "0". DP masters and DP slaves have a PROFIBUS address in the
range from 1 to 125.
PROFIBUS device
A PROFIBUS device has at least one PROFIBUS interface with an electrical (RS485)
or optical (Polymer Optical Fiber, POF) interface.
PROFIBUS DP
A PROFIBUS with DP protocol that complies with EN 50170. DP stands for distributed I/O
(fast, real-time capable, cyclic data exchange). From the perspective of the user program,
the distributed I/O is addressed in exactly the same way as the centralized I/O.
PROFINET
Open, component-based industrial communication system based on Ethernet for distributed
automation systems. Communication technology supported by the PROFIBUS User
Organization.
RS 485
Asynchronous data transmission process for PROFIBUS DP to ANSI TIA/EIA-RS485-A.
RS 485 repeater
Equipment for amplifying bus signals and for coupling segments over long distances.
Segment
The bus line between two terminating resistors forms a bus segment.
A bus segment can contain up to 32 bus nodes. Segments can be coupled,
for example, by means of RS 485 repeaters or diagnostic repeaters.
Slave
Distributed device in a fieldbus system that may exchange data with a master after being
requested to do so by the master. Slaves are all DP slaves, for example, such as ET 200SP,
ET 200MP.
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Glossary
Standard mounting rail
Standardized metal profile to EN 50022.
The standard mounting rail is used for quick snap-on installation of network components,
such as OLM, repeaters, etc.
Subnet
Part of a network whose parameters must be synchronized with the devices
(e.g., with PROFIBUS). It includes the bus components and all connected stations.
SynchronousCycle
Name for synchronous cycle interrupt OB in STEP 7.
Target-Rotation-Time (Ttr)
Bus parameter for PROFIBUS. The token is the send permission for a device on
PROFIBUS. A device compares a token rotation time it has measured with the
Target-Rotation-Time and controls the sending of frames with high priority or low
priority based on this comparison.
Terminating resistor
Component that terminates the ends of a data transmission line to prevent reflections
in the transmission medium.
Terminator
Terminating resistor of bus segments with transmission rates of 9.6 kbps to 12 Mbps.
The power supply is separate from the bus nodes.
TIA Portal
Totally Integrated Automation Portal
Topology
Structure of a network. Common structures are line topology, ring topology, star topology
and tree topology.
Transmission rate
Specifies the number of bits transmitted per second.
Watchdog
Mechanism for monitoring the readiness for operation.
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Index
A
Acyclical data exchange, 74
Address assignment, 44
Addressing, 41
B
Bus connector
IP20, 21
M12 with IP65, 23
Bus parameters
Adapting, 49
Description, 51
Value ranges, 53
Bus profile, user-defined, 53
Bus terminal
M12, 23
RS 485, 23
C
Cable configuration, 48
Cables, 18
Calculate bus times, 50
CANopen module, 29
Communication
I/O communication, 13
Communication load, 50
Components, 28
Configuration, 41
Configuring isochronous mode, 67
Basic procedure, 66
DP slave, 67
Requirements, 65
Updating the process image partition, 68
Connecting PROFIBUS DP with PROFINET IO, 40
Constant bus cycle time, 54
D
Diagnostic repeater
Cascade depth, 36
Description, 28
Diagnostics, 59
Topology, 36
Diagnostics, 57
Display alarms, 58
Isochronous mode, errors and remedies, 69
Display, diagnostic messages, 58
Documentation, 7
DP slave, 42
DP/AS-i F-Link, 30
DP/AS-i LINK Advanced, 30
DP/AS-Interface Link 20E, 30
DP/DP coupler, 29
DP/PA bus link, 30
E
Example of isochronous mode, 62
F
FastConnect system, 19
Fiber-optic, 26
Fiber-optic cables, 24
Glass, 26
Optical ring, 48
PCF, 25
Plastic, 25
G
GAP factor, 53
H
Hardware
Configuring, 41
Parameter assignment, 41
I
I/O addresses, 68
I/O communication, 13
Identification and maintenance data (I&M data), 60
IE/PB Link PN, 29
Increasing DP cycle time, 55
Installation, 16
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Index
Active network components, 28
Bus connection, 21
Cables, 18
FastConnect, 19
Topology, 34
Interrupt OBs, 77
Interrupts
DPV1, 77
Isochronous mode, 69
Isochronous mode
Change parameters, 70
Description, 61
Diagnostics, 69
Dialog box for isochronous mode, 71
Example, 62
Interrupts, 69
Sequence, in principle, 64
IWLAN/PB Link PN IO, 29, 39
M
M12
Bus connector, 23
Bus terminating resistor, 23
M12 bus terminating resistor, 23
Maximum cable lengths
Maximum cable lengths, 19
N
Network, 16
electrical, conducted, 28
Optical, 32
optical, electrical, 16
Selection criteria, 16
Topology, 34
Network components
Bus connections, 19
CANopen module, 29
Diagnostic repeater, 28
DP/AS-i F-Link, 30
DP/AS-i LINK Advanced, 30
DP/AS-Interface Link 20E, 30
DP/DP coupler, 29
Fiber-optic cables, 24
IE/PB Link PN, 29
IWLAN/PB Link PN IO, 29
OBT, Optical Bus Terminal, 32
OLM, Optical Link Module, 32
PROFIBUS terminator, 29
RS 485 cables, 18
RS485, 28
Network settings, 45
O
Optical Bus Terminal, OBT, 32
Optical Link Module, OLM
Description, 32
Topology, 39
Optical ring, 48, 49
P
Parameter assignment, 41
Process image partition, 68
PROFIBUS
Address, 44
Devices, 11
Installation, 16
PROFIBUS DP, 9
Protocols, 9
RS 485 cables, 18
PROFIBUS address, 44
Change, 44
HSA, 45
PROFIBUS DP
Applications, 10
Assigning the DP slave, 42
Connecting with PROFINET, 40
Definition, 9
Devices and designations, 12
Interface, 15
PROFIBUS DP interface
Properties, 15
Representation in STEP 7, 15
PROFIBUS terminator, 29
Profiles for network settings
DP, Standard, 45
User-defined, 47
PROFINET Proxy functionality, 40
Programming isochronous mode, 69
R
Retry limit, 49, 53
RS 485 cables, 19
RS485 repeater
Description, 28
Topology, 34
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Index
S
Slot time, 49, 53
SYNC/FREEZE, 75
Synchronization, sequence, 64
Synchronous cycle interrupt, 68
Synchronous cycle interrupt OB,
SynchronousCycle, 69
SynchronousCycle, synchronous cycle interrupt OB, 69
T
Target Rotation Time, 53
Topology
Connecting PROFIBUS DP with PROFINET, 40
OLM, 39
RS485 repeater, 34
WLAN, 39
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Index
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