Siemens Simatic S7-1500R User guide

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SIMATIC
S7-1500
S7-1500R/H redundant system
System Manual
10/2018
A5E41814787
-AA
Preface
Documentation guide
1
System overview
2
Application planning
3
Installation
4
Wiring
5
Configuration
6
Basics of program execution
7
Protection
8
Commissioning
9
Display
10
Maintenance
11
Test functions
12
Technical specifications
13
Dimension drawings
A
Accessories/spare parts
B
Safety symbols
C

Siemens AG
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A5E41814787-AA
Ⓟ
09/2018 Subject to change
Copyright © Siemens AG 2018.
All rights reserved
Legal information
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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
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DANGER
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WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
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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.
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Note the following:
WARNING
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Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 3
Preface
Purpose of the documentation
This documentation provides important information on the following aspects of the
S7-1500R/H redundant system:
●An overview of the redundant system
●Configuration and failure scenarios
●How to install, wire and commission the redundant system
●Information on maintenance and fault correction
Basic knowledge required
General knowledge in the field of automation engineering is required to understand this
documentation.
Validity of the documentation
This documentation applies to all products of the SIMATIC S7-1500R/H redundant system.
Conventions
STEP 7: In this documentation, "STEP 7" is used as a synonym for all versions of the
configuration and programming software "STEP 7 (TIA Portal)".
Please also see the notes indicated as follows:
Note
A note contains important information on the product described in the
documentation, on the
handling of the product or on the section of the documentation to which particular attention
should be paid.
Recycling and disposal
For environmentally friendly recycling and disposal of your old equipment, contact a certified
electronic waste disposal company and dispose of the equipment according to the applicable
regulations in your country.

Preface
S7-1500R/H redundant system
4System Manual, 10/2018, A5E41814787-AA
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens' products and solutions constitute one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be
connected to an enterprise network or the internet if and to the extent such a connection is
necessary and only when appropriate security measures (e.g. firewalls and/or network
segmentation) are in place.
For additional information on industrial security measures that may be implemented, please
visit (https://www.siemens.com/industrialsecurity).
Siemens' products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customers' exposure
to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed under (https://www.siemens.com/industrialsecurity).
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(https://support.industry.siemens.com).

Preface
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 5
Industry Mall
The Industry Mall is the catalog and order system of Siemens AG for automation and drive
solutions on the basis of Totally Integrated Automation (TIA) and Totally Integrated Power
(TIP).
You can find catalogs for all automation and drive products on the Internet
(https://mall.industry.siemens.com).

S7-1500R/H redundant system
6System Manual, 10/2018, A5E41814787-AA
Table of contents
Preface ................................................................................................................................................... 3
1 Documentation guide ............................................................................................................................ 11
2 System overview................................................................................................................................... 14
2.1 What is the S7-1500R/H redundant system? ........................................................................ 14
2.1.1 Areas of application ............................................................................................................... 15
2.1.2 Operating principle of the S7-1500R/H redundant system .................................................... 19
2.1.3 Plant components and automation levels .............................................................................. 25
2.1.4 Scalability............................................................................................................................... 26
2.1.5 Overview of features .............................................................................................................. 29
2.2 Configuration.......................................................................................................................... 30
2.2.1 Structure of the S7-1500R redundant system ....................................................................... 30
2.2.2 Structure of the S7-1500H redundant system ....................................................................... 31
2.2.3 Components........................................................................................................................... 33
2.3 S7-1500 R/H-CPUs................................................................................................................ 35
2.3.1 Overview of the CPU technical specifications ....................................................................... 35
2.3.2 Redundancy........................................................................................................................... 36
2.3.3 Security .................................................................................................................................. 38
2.3.4 Diagnostics............................................................................................................................. 39
2.3.5 Trace ...................................................................................................................................... 41
2.4 Communication ...................................................................................................................... 43
2.4.1 System and device IP addresses........................................................................................... 43
2.4.2 Integrated interfaces for communication................................................................................ 45
2.4.3 HMI devices ........................................................................................................................... 46
2.5 Power supply.......................................................................................................................... 46
2.6 Software ................................................................................................................................. 47
2.6.1 TIA Portal ............................................................................................................................... 47
2.6.2 SINETPLAN ........................................................................................................................... 48
2.6.3 PRONETA.............................................................................................................................. 48
3 Application planning.............................................................................................................................. 49
3.1 Requirements......................................................................................................................... 49
3.2 Restrictions compared to the S7-1500 automation system ................................................... 51
3.3 Configuration versions ........................................................................................................... 54
3.3.1 S7-1500R/H configuration with IO devices in the PROFINET ring........................................ 55
3.3.2 S7-1500R/H configuration with switches and linear topology................................................ 57
3.4 Redundancy scenarios .......................................................................................................... 59
3.4.1 Introduction ............................................................................................................................ 59
3.4.2 Failure of the primary CPU .................................................................................................... 60
3.4.3 Failure of the backup CPU..................................................................................................... 62
3.4.4 Failure of the PROFINET cable in the PROFINET ring......................................................... 64
3.4.5 Specific redundancy scenarios for S7-1500H........................................................................ 66
3.4.5.1 Failure of a redundancy connection in S7-1500H.................................................................. 66
3.4.5.2 Failure of both redundancy connections in S7-1500H > 1500 ms apart ............................... 68
3.4.5.3 Failure of both redundancy connections and the PROFINET cable in the PROFINET
ring ......................................................................................................................................... 70

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System Manual, 10/2018, A5E41814787-AA 7
3.5 Failure scenarios.....................................................................................................................72
3.5.1 Failure of an IO device in the PROFINET ring .......................................................................73
3.5.2 Failure of a switch (with line topology) in the PROFINET ring................................................75
3.5.3 Specific failure scenarios with S7-1500R ...............................................................................77
3.5.3.1 Two cable interruptions in the PROFINET ring in S7-1500R > 1500 ms apart ......................77
3.5.3.2 Two cable interruptions in the PROFINET ring in S7-1500R within ≤ 1500 ms .....................79
3.5.3.3 Failure of the primary CPU when IO devices have failed in the PROFINET ring...................81
3.5.4 Specific failure scenarios with S7-1500H ...............................................................................84
3.5.4.1 Failure of both redundancy connections in S7-1500H ≤ 1500 ms apart ................................84
3.5.4.2 Failure of one redundancy connection and the primary CPU in S7-1500H............................86
3.6 Hardware configuration...........................................................................................................88
3.7 Use of a system power supply................................................................................................90
3.8 Using HMI devices ..................................................................................................................92
4 Installation ............................................................................................................................................ 96
4.1 Basics......................................................................................................................................96
4.2 Installing the mounting rail ......................................................................................................98
4.3 Installing a load current supply .............................................................................................102
4.4 Installing a system power supply ..........................................................................................104
4.5 Installing R/H-CPUs ..............................................................................................................106
5 Wiring ................................................................................................................................................. 108
5.1 Rules and regulations for operation......................................................................................108
5.2 Operation on grounded infeed ..............................................................................................110
5.3 Electrical configuration..........................................................................................................113
5.4 Wiring rules ...........................................................................................................................114
5.5 Connecting the supply voltage..............................................................................................115
5.6 Connecting system power supply and load current supply ..................................................117
5.7 Connecting the CPU to the load power supply.....................................................................118
5.8 Connecting interfaces for communication with S7-1500R....................................................120
5.8.1 Connecting the PROFINET ring to S7-1500.........................................................................120
5.9 Connecting interfaces for communication with S7-1500H....................................................123
5.9.1 Connecting redundancy connections (fiber-optic cables).....................................................123
5.9.1.1 Synchronization modules for S7-1500H ...............................................................................123
5.9.1.2 Selecting fiber-optic cables...................................................................................................124
5.9.1.3 Installing fiber-optic cables ...................................................................................................128
5.9.1.4 Connecting redundancy connections (fiber-optic cables) to S7-1500H ...............................130
5.9.2 Connecting the PROFINET ring to S7-1500H ......................................................................134

Table of contents
S7-1500R/H redundant system
8System Manual, 10/2018, A5E41814787-AA
6 Configuration .......................................................................................................................................136
6.1 Configuring the CPU ............................................................................................................ 136
6.2 Configuration procedure ...................................................................................................... 136
6.3 Project tree........................................................................................................................... 143
6.4 Parameters........................................................................................................................... 144
6.5 Process images and process image partitions .................................................................... 145
6.5.1 Process image - overview.................................................................................................... 145
6.5.2 Updating process image partitions in the user program ...................................................... 146
7 Basics of program execution ................................................................................................................148
7.1 Programming the S7-1500R/H............................................................................................. 148
7.2 Restrictions .......................................................................................................................... 150
7.3 Events and OBs ................................................................................................................... 153
7.4 Special instructions for S7-1500R/H redundant systems .................................................... 157
7.4.1 Disabling/enabling SYNCUP with the RH_CTRL instruction ............................................... 157
7.4.2 Determining the primary CPU with "RH_GetPrimaryID" ...................................................... 160
7.5 Asynchronous instructions ................................................................................................... 161
8 Protection ............................................................................................................................................168
8.1 Overview of the protection functions.................................................................................... 168
8.2 Configuring access protection for the CPU.......................................................................... 168
8.3 Using the display to set additional password protection...................................................... 172
8.4 Using the user program to set additional access protection................................................ 172
8.5 Know-how protection ........................................................................................................... 173
8.6 Protection by locking the CPU ............................................................................................. 177
9 Commissioning ....................................................................................................................................178
9.1 Overview .............................................................................................................................. 178
9.2 Check before powering on for the first time ......................................................................... 179
9.3 Commissioning procedure ................................................................................................... 180
9.3.1 Removing/plugging in SIMATIC memory cards................................................................... 181
9.3.2 First power-on of the CPUs.................................................................................................. 184
9.3.3 CPU pairing.......................................................................................................................... 184
9.3.4 Redundancy IDs................................................................................................................... 187
9.3.5 Downloading projects to the CPUs ...................................................................................... 192
9.4 Operating and system states ............................................................................................... 197
9.4.1 Overview .............................................................................................................................. 197
9.4.2 STARTUP operating state ................................................................................................... 200
9.4.3 STOP operating state .......................................................................................................... 203
9.4.4 SYNCUP operating state ..................................................................................................... 203
9.4.5 RUN operating states........................................................................................................... 204
9.4.6 SYNCUP system state......................................................................................................... 205
9.4.7 System and operating state transitions................................................................................ 217
9.4.8 Loss of redundancy.............................................................................................................. 226
9.4.9 Displaying and changing the system state .......................................................................... 229

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System Manual, 10/2018, A5E41814787-AA 9
9.5 CPU memory reset ...............................................................................................................231
9.5.1 Automatic memory reset .......................................................................................................232
9.5.2 Manual memory reset ...........................................................................................................233
9.6 Backing up and restoring the CPU configuration..................................................................234
9.7 Time synchronization ............................................................................................................239
9.7.1 Example: Configuring the NTP server ..................................................................................240
9.8 Identification and maintenance data.....................................................................................241
9.8.1 Reading out and entering I&M data ......................................................................................241
9.8.2 Record structure for I&M data...............................................................................................243
9.8.3 Example: Read out firmware version of the CPU with Get_IM_Data ...................................245
10 Display................................................................................................................................................ 248
10.1 CPU display ..........................................................................................................................248
11 Maintenance ....................................................................................................................................... 257
11.1 Replacing components of the S7-1500R/H redundant system ............................................257
11.1.1 Checking before replacing components ...............................................................................257
11.1.2 Replacing defective R/H-CPUs.............................................................................................260
11.1.3 Replacing defective redundancy connections ......................................................................261
11.1.3.1 Replacing two defective PROFINET cables with S7-1500R ................................................262
11.1.3.2 Replacing a defective redundancy connection with S7-1500H ............................................263
11.1.3.3 Replacing defective synchronization module with S7-1500H...............................................263
11.1.3.4 Replacing both defective redundancy connections with S7-1500H .....................................264
11.1.4 Replacing defective PROFINET cables................................................................................265
11.1.5 Replacing a defective SIMATIC memory card......................................................................266
11.1.6 Replacing a defective system power supply PS or load power supply PM ..........................267
11.1.7 Replacing defective IO devices/switches..............................................................................268
11.2 Replacing the front cover......................................................................................................269
11.3 Replacing the coding element at the power connector of the system power supply and
load current supply................................................................................................................270
11.4 Firmware update ...................................................................................................................272
11.5 Resetting CPUs to factory settings .......................................................................................277
11.6 Maintenance and repair ........................................................................................................281
12 Test functions ..................................................................................................................................... 282
12.1 Test functions........................................................................................................................282
12.2 Reading out/saving service data...........................................................................................287
13 Technical specifications ...................................................................................................................... 289
13.1 Standards and Approvals .....................................................................................................290
13.2 Electromagnetic compatibility ...............................................................................................296
13.3 Shipping and storage conditions...........................................................................................298
13.4 Mechanical and climatic ambient conditions ........................................................................299
13.5 Information on insulation tests, protection class, degree of protection and rated voltage....300
13.6 Use of S7-1500R/H in Zone 2 hazardous area ....................................................................301

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S7-1500R/H redundant system
10 System Manual, 10/2018, A5E41814787-AA
A Dimension drawings.............................................................................................................................302
B Accessories/spare parts.......................................................................................................................305
C Safety symbols ....................................................................................................................................307
C.1 Safety-related symbols for devices without Ex protection ................................................... 307
C.2 Safety-related symbols for devices with Ex protection ........................................................ 308
Glossary ..............................................................................................................................................310
Index ...................................................................................................................................................323

S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 11
Documentation guide
1
The documentation for the redundant S7-1500R/H system is divided into three areas.
This division enables you to access the specific content you require.
Figure 1-1 S7-1500R/H guide
Basic information
The System Manual and Getting Started describe in detail the configuration, installation,
wiring and commissioning of the redundant S7-1500R/H system. The STEP 7 online help
supports you in the configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, wiring diagrams, characteristics and technical specifications.
General information
The function manuals contain detailed descriptions on general topics regarding the
redundant S7-1500R/H system, e.g. diagnostics, communication.
You can download the documentation free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742691).
Changes and supplements to the manuals are documented in a Product Information.
You can download the product information free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742691).

Documentation guide
S7-1500R/H redundant system
12 System Manual, 10/2018, A5E41814787-AA
S7-1500/ET 200MP Manual Collection
The S7-1500/ET 200MP Manual Collection contains the complete documentation on the
redundant S7-1500R/H system gathered together in one file.
You can find the Manual Collection on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86140384).
SIMATIC S7-1500 comparison list for programming languages
The comparison list contains an overview of which instructions and functions you can use for
which controller families.
You can find the comparison list on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/86630375).
"mySupport"
With "mySupport", your personal workspace, you make the best out of your Industry Online
Support.
In "mySupport", you can save filters, favorites and tags, request CAx data and compile your
personal library in the Documentation area. In addition, your data is already filled out in
support requests and you can get an overview of your current requests at any time.
You must register once to use the full functionality of "mySupport".
You can find "mySupport" on the Internet (https://support.industry.siemens.com/My/ww/en/).
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"mySupport" - CAx data
In the CAx data area in "mySupport", you can access the current product data for your CAx
or CAe system.
You configure your own download package with a few clicks.
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●Product images, 2D dimension drawings, 3D models, internal circuit diagrams, EPLAN
macro files
●Manuals, characteristics, operating manuals, certificates
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(https://support.industry.siemens.com/my/ww/en/CAxOnline).

Documentation guide
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 13
Application examples
The application examples support you with various tools and examples for solving your
automation tasks. Solutions are shown in interplay with multiple components in the system -
separated from the focus on individual products.
You will find the application examples on the Internet
(https://support.industry.siemens.com/sc/ww/en/sc/2054).
PRONETA
With SIEMENS PRONETA (PROFINET network analysis), you analyze the PROFINET
network during commissioning. PRONETA features two core functions:
●The topology overview independently scans PROFINET network and all connected
components.
●The IO check is a fast test of the wiring and the module configuration of a system.
You can find SIEMENS PRONETA on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/67460624).
SINETPLAN
SINETPLAN, the Siemens Network Planner, supports you in planning automation systems
and networks based on PROFINET. The tool facilitates professional and predictive
dimensioning of your PROFINET installation as early as in the planning stage. In addition,
SINETPLAN supports you during network optimization and helps you to exploit network
resources optimally and to plan reserves. This helps to prevent problems in commissioning
or failures during productive operation even in advance of a planned operation. This
increases the availability of the production plant and helps improve operational safety.
The advantages at a glance
●Network optimization thanks to port-specific calculation of the network load
●Increased production availability thanks to online scan and verification of existing systems
●Transparency before commissioning through importing and simulation of existing STEP 7
projects
●Efficiency through securing existing investments in the long term and optimal exploitation
of resources
You can find SINETPLAN on the Internet (https://www.siemens.com/sinetplan).

S7-1500R/H redundant system
14 System Manual, 10/2018, A5E41814787-AA
System overview
2
2.1
What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
For the S7-1500R/H redundant system, the CPUs are duplicated, in other words redundant.
The two CPUs process the same project data and the same user program in parallel. The
two CPUs are synchronized over two redundancy connections. If one CPU fails, the other
CPU maintains control of the process.
Aims of using redundant automation systems
Redundant automation systems are used in practice to achieve greater availability or fail-
safety.
●Purpose of fault-tolerant systems: to reduce the probability of production downtime by
operating two systems in parallel.
●Purpose of fail-safe systems: to protect life, the environment and capital with safe
shutdown to a secure state.
WARNING
Please note the difference between fault-tolerant and fail-safe systems.
S7-1500R/H is a fault-tolerant automation system, but not a fail-safe system. The S7-
1500R/H system must not be used to control safety-critical processes.

System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 15
2.1.1
Areas of application
Objective
The S7-1500R/H redundant system offers a high degree of reliability and system availability.
A redundant configuration of the most important automation components reduces the
probability of production downtimes and the consequences of component errors.
The higher the risks and costs of a production downtime, the more worthwhile the use of a
redundant system. You can compensate for the generally higher investment costs by
avoiding production downtimes.
Use
In redundantly operated systems, failure or malfunction of individual automation components
must not impede the operation of the plant. S7-1500R/H redundant systems are used in the
following areas, for example:
●Tunnels
●Airports (for example baggage conveyors)
●Subways
●Shipbuilding
●Wastewater treatment plants
●High-bay warehouse

System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
16 System Manual, 10/2018, A5E41814787-AA
Example 1: Avoiding downtimes
Automation task
An automation solution is required for a road tunnel to:
●Control the lighting in the tunnel
●Control the ventilation in the tunnel in line with the concentration of pollutants in the tunnel
Feature
Uninterrupted operation of the ventilation system is required to keep the concentration of
pollutants below a set level. Constant availability must be ensured for the event that
individual automation components fail, for example because of a fire in the tunnel.
Solution
Three fans (M) ventilate the tunnel. The automation solution controls the fan speeds in line
with the measured pollutant concentration. Three sensors in the tunnel measure the pollutant
levels in the air. The S7-1500H redundant system with two redundant CPUs is used to
ensure fan availability.
As well as controlling the fans, the S7-1500H redundant system also controls the illumination
and the traffic lights.
Figure 2-1 Example: Tunnel automation
Benefits
The user program for controlling the fans runs on both CPUs in the S7-1500H redundant
system. You can position the two CPUs up to 10 kilometers apart. If one CPU or one
redundancy connection fails due to a local incident, the incident does not affect the
controlled process. The fans continue to operate.
You can find a detailed description of tunnel automation with S7-1500H in Getting started
(https://support.industry.siemens.com/cs/ww/en/view/109757712) Redundant system S7-
1500R/H.

System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 17
Example 2: Avoiding high system restart costs as a result of data loss
Automation task
A logistics company needs a matching automation solution for controlling the storage and
retrieval unit in a high-bay warehouse.
Feature
The failure of a controller would have serious consequences. After the system restart, you
would have to reposition the storage and retrieval units and record the content of the
containers again. The automation solution must ensure that no data is lost if a CPU fails and
that the warehouse can continue to operate.
Solution
To store goods in and retrieve them from the bays, the storage and retrieval unit moves
along an X, Y and Z axis. If the process is interrupted, data can be lost and the location of
the goods is not known. To guard against the loss of data, the storage and retrieval unit is
controlled by the S7-1500R redundant system.
Figure 2-2 Example: High-bay warehouse
Benefits
If one CPU fails, the second CPU maintains control of the process. The project data and the
user program are saved redundantly and are not lost if a CPU fails. Once you have replaced
the defective CPU and switched it to RUN, the redundant system automatically synchronizes
the project data with the user program in the new CPU. The solution saves you service time
and downtime costs for the warehouse.

System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
18 System Manual, 10/2018, A5E41814787-AA
Example 3: Avoiding equipment and material damage
Automation task
A steel works needs a matching automation solution to control a blast furnace for the steel
production.
Feature
Failures, especially in the process industry, can result in damages to the system, workpieces
or material. In a steelworks, there is a danger of the pig iron cooling if the process is
interrupted. The pig iron then cannot be used for the production of steel. The automation
solution must ensure that the plant continues to run if a CPU fails and that the material is not
damaged.
Solution
The S7-1500R redundant system controls the blast furnace. The distributed automation
components of the redundant system control the temperature, volume and pressure
parameters.
Figure 2-3 Example: Blast furnace
Benefits
The S7-1500R redundant system compensates for the possible failure of a CPU or
redundant connection. You do not have to interrupt the smelting process when replacing a
CPU while the plant is running. Uninterrupted plant operation avoids high restart and
material costs.

System overview
2.1 What is the S7-1500R/H redundant system?
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA 19
2.1.2
Operating principle of the S7-1500R/H redundant system
Introduction
S7-1500R/H redundant systems tolerate the failure of one of the two CPUs or an interruption
in the PROFINET ring. The S7-1500R and S7-1500H systems differ in structure,
configuration limits and performance.
S7-1500 design and operating principle
The figure below shows the typical structure of the S7-1500R redundant system.
①
S7-1500R CPU
②
PROFINET cable (redundancy connections, PROFINET ring)
③
IO device
④
Switch
Figure 2-4 Structure of an S7-1500R redundant system