Siemens Simatic S7-1500 Parts list manual

Communication

SIMATIC
S7-1500, ET 200MP, ET 200SP,
ET 200AL, ET 200pro
Communication
Function Manual
11/2019
A5E03735815
-AH
Preface
Function manuals
Documentation Guide
1
Product overview
2
Communications services
3
PG communication
4
HMI communication
5
Open User Communication
6
S7 communication
7
Point-to-point link
8
OPC UA communication
9
Routing
10
Connection resources
11
Diagnostics and fault
correction
12
Communication with the
redundant system S7-
1500R/H
13
Industrial Ethernet Security
with CP 1543-1
14

Siemens AG
Digital Industries
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A5E03735815-AH
Ⓟ
10/2019 Subject to change
Copyright © Siemens AG 2013 - 2019.
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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
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property damage.
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information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

Communication
Function Manual, 11/2019, A5E03735815-AH 3
Preface
Purpose of the documentation
This function manual provides you with an overview of the communication options, the
CPUs, communication modules and processors and PC systems of the systems SIMATIC
S7-1500, ET 200MP, ET 200SP, ET 200AL, ET 200pro and SIMATIC Drive Controller. This
function manual describes the connection-oriented, asynchronous communication.
The documentation covers the following:
●Overview of the communication services
●Properties of the communication services
●Overview of the user activities for setting up the communication services
Basic knowledge required
The following knowledge is required in order to understand the Function manual:
●General knowledge of automation technology
●Knowledge of the industrial automation system SIMATIC
●Knowledge about how to use STEP 7 (TIA Portal)
Scope of the documentation
This documentation is the basic documentation for all products of the SIMATIC S7-1500,
ET 200MP, ET 200SP, ET 200AL and ET 200pro systems. The product documentation is
based on this documentation.

Preface
Communication
4Function Manual, 11/2019, A5E03735815-AH
What's new in the Communication Function Manual, Edition 11/2019 as compared to Edition
10/2018?
What's new?
What are the customer benefits?
Where can I find the information?
IP forwarding Simple access from the control level to the field
level for configuration and parameter assignment
of devices, e.g. via PDM or Web browser.
IP forwarding (Page 294)
OPC UA server expansion For S7-1500 CPUs as of firmware V2.8 and TIA
Portal version 16, with a corresponding Runtime
license, you can benefit from the following ex-
pansions of the integrated OPC UA server:
•Improved diagnostics: The OPC UA user
receives information on the status of the OPC
UA server via messages in the diagnostic
buffer, an OPC UA category in the Online &
Diagnostics area of TIA Portal as well as an
improved connection resources display.
•Download behavior: In RUN mode, the OPC
UA server only performs a restart during
download from the TIA Portal when the newly
downloaded data has an effect on the data
management of the OPC UA server.
•Server interface modeling: It is now possible
in the TIA Portal to model server interfaces or
import OPC UA Companion Specifications
and map them to the PLC data management.
Section OPC UA communication
(Page 126)
What's new in the Communication Function Manual, Edition 10/2018 as compared to Edition
12/2017?
What's new?
What are the customer benefits?
Where can I find information?
Description of communication
with the redundant system
S7-1500R/H
You receive information on the particularities of
communication with the redundant system S7-
1500R/H
Section Communication with the
redundant system S7-1500R/H
(Page 324)
Scope of the function manual
expanded to include the redun-
dant system S7-1500R/H
Functions with which you are familiar from the
SIMATIC S7-1500 automation system are im-
plemented for the redundant system
S7-1500R/H.
Redundant System S7-1500R/H
System Manual
(https://support.industry.siemens.co
m/cs/ww/en/view/109754833)

Preface
Communication
Function Manual, 11/2019, A5E03735815-AH 5
What's new in the Communication Function Manual, Edition 12/2017 compared to Edition 09/2016
What's new?
What are the customer benefits?
Where can I find the information?
OPC UA Companion Specifica-
tion
Through OPC UA Companion Specification,
methods can be specified in a uniform and
manufacturer-neutral way. Using these specified
methods, you can easily integrate devices from
various manufacturers into the plant and the
production processes.
Section OPC UA server interface
configuration (Page 199)
Setting up a secure connection
to a mail server over the CPU
interface
You can set up a secure connection to a mail
server without additional hardware.
Section Secure OUC via e-mail
(Page 107)
Secure communication over
Modbus TCP
You can establish secure TCP connections be-
tween a Modbus TCP client and a Modbus TCP
server.
Section Secure OUC with Modbus
TCP (Page 106)
What's new in the Communication Function Manual, Edition 09/2016 compared to Edition 12/2014
What's new?
What are the customer benefits?
Where can I find the information?
OPC UA server OPC UA is a uniform standard for data commu-
nication and is independent of any particular
operating system platforms.
OPC UA uses integrated safety mechanisms on
various automation systems, for example with
data exchange, at application level, for the legit-
imation of the user.
The OPC UA server provides a large amount of
data:
•Values of PLC tags that clients can access
•Data types of these PLC tags
•Information about the OPC UA server itself
and the CPU
In this way, clients can gain an overview of the
tag management and can read and write values.
Section OPC UA communication
(Page 126)
Secure Open User Communica-
tion
Secure data exchange with other devices. Section Secure Open User Com-
munication (Page 92)
Certificate handling in STEP 7 You can manage certificates for the following
applications in STEP 7:
•OPC UA server
•Secure Open User Communication
•Web server of the CPU
Section Managing certificates with
STEP 7 (Page 43)
Deactivating SNMP for the CPU You can deactivate SNMP for the CPU. This can
make sense under certain conditions, for exam-
ple if the security guidelines in your network do
not permit SNMP.
Section Disabling SNMP (Page 57)

Preface
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6Function Manual, 11/2019, A5E03735815-AH
Conventions
STEP 7: We refer to "STEP 7" in this documentation as a synonym for the configuration and
programming software "STEP 7 as of V12 (TIA Portal)".
"S7-1500 CPUs" also refers to the CPU variants S7 1500F, S7 1500T, S7 1500TF,
S7 1500C, S7-1500R/H, S7 1500pro, ET200S, S7 1500 Software Controller as well as
SIMATIC Drive Controller.
This documentation contains pictures of the devices described. The figures may differ
slightly from the device supplied.
You should also pay particular attention to notes such as the one shown below:
Note
A note contains important information on the pro
duct, on handling of the product and on the
section of the documentation to which you should pay particular attention.
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 visit (https://www.siemens.com/industrialsecurity).

Preface
Communication
Function Manual, 11/2019, A5E03735815-AH 7
Siemens Industry Online Support
You can find current information on the following topics quickly and easily here:
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All the information and extensive know-how on your product, technical specifications,
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●mySupport
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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).

Communication
8Function Manual, 11/2019, A5E03735815-AH
Table of contents
Preface ...................................................................................................................................................... 3
1 Function manuals Documentation Guide................................................................................................. 12
2 Product overview ..................................................................................................................................... 14
3 Communications services........................................................................................................................ 19
3.1 Overview of communication options ...................................................................................... 19
3.2 Communications protocols and port numbers used for Ethernet communication ................. 22
3.3 Overview of connection resources......................................................................................... 27
3.4 Setting up a connection ......................................................................................................... 27
3.5 Data consistency.................................................................................................................... 31
3.6 Secure Communication.......................................................................................................... 34
3.6.1 Basics of Secure Communication.......................................................................................... 34
3.6.2 Confidentiality through encryption.......................................................................................... 36
3.6.3 Authenticity and integrity through signatures......................................................................... 39
3.6.4 Managing certificates with STEP 7 ........................................................................................ 43
3.6.5 Examples for the management of certificates........................................................................ 47
3.6.6 Example: HTTP over TLS...................................................................................................... 53
3.7 SNMP..................................................................................................................................... 57
3.7.1 Disabling SNMP..................................................................................................................... 57
3.7.2 Example: Disabling SNMP for a CPU 1516-3 PN/DP............................................................ 58
4 PG communication .................................................................................................................................. 60
5 HMI communication ................................................................................................................................. 63
6 Open User Communication...................................................................................................................... 65
6.1 Overview of Open User Communication ............................................................................... 65
6.2 Protocols for Open User Communication .............................................................................. 66
6.3 Instructions for Open User Communication........................................................................... 68
6.4 Open User Communication with addressing via domain names........................................... 73
6.5 Setting up Open User Communication via TCP, ISO-on-TCP, UDP and ISO ...................... 75
6.6 Setting up communication over FDL...................................................................................... 82
6.7 Setting up communication with Modbus TCP........................................................................ 84
6.8 Setting up communication via e-mail ..................................................................................... 87
6.9 Setting up communication via FTP ........................................................................................ 88
6.10 Establishment and termination of communications relations................................................. 91

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6.11 Secure Open User Communication........................................................................................92
6.11.1 Secure OUC of an S7-1500 CPU as TLS client to an external PLC (TLS server) .................92
6.11.2 Secure OUC of an S7-1500 CPU as TLS server to an external PLC (TLS client) .................95
6.11.3 Secure OUC between two S7-1500 CPUs .............................................................................97
6.11.4 Secure OUC via CP interface...............................................................................................101
6.11.5 Secure OUC with Modbus TCP............................................................................................106
6.11.6 Secure OUC via e-mail .........................................................................................................107
7 S7 communication ................................................................................................................................. 112
8 Point-to-point link................................................................................................................................... 121
9 OPC UA communication........................................................................................................................ 126
9.1 What you need to know about OPC UA ...............................................................................126
9.1.1 OPC UA and Industrie 4.0 ....................................................................................................126
9.1.2 General features of OPC UA ................................................................................................126
9.1.3 OPC UA for S7-1200/S7-1500 CPUs ...................................................................................130
9.1.4 Access to OPC UA applications ...........................................................................................131
9.1.5 Addressing nodes .................................................................................................................135
9.1.6 What you need to know about OPC UA clients....................................................................139
9.1.7 Mapping of data types ..........................................................................................................142
9.2 Security at OPC UA ..............................................................................................................146
9.2.1 Security settings....................................................................................................................146
9.2.2 Certificates pursuant to ITU X.509........................................................................................147
9.2.3 Certificates with OPC UA......................................................................................................151
9.2.4 Creating self-signed certificates............................................................................................152
9.2.5 Generating PKI key pairs and certificates yourself...............................................................153
9.2.6 Secure transfer of messages................................................................................................156
9.3 Using the S7-1500 as an OPC UA server ............................................................................159
9.3.1 Interesting information about the OPC UA server of the S7-1500 CPUs.............................159
9.3.1.1 The OPC UA server of the S7-1500 CPUs...........................................................................159
9.3.1.2 End points of the OPC UA server.........................................................................................161
9.3.1.3 Runtime behavior of the OPC UA server..............................................................................163
9.3.2 Configuring access to PLC tags ...........................................................................................165
9.3.2.1 Managing write and read rights ............................................................................................165
9.3.2.2 Managing write and read rights for a complete DB ..............................................................167
9.3.2.3 Coordinating write and read rights for CPU tags ..................................................................169
9.3.2.4 Consistency of CPU tags......................................................................................................171
9.3.2.5 Accessing OPC UA server data............................................................................................173
9.3.2.6 MinimumSamplingInterval attribute ......................................................................................174
9.3.2.7 Export OPC UA XML file.......................................................................................................174
9.3.3 Configuring the OPC UA server............................................................................................175
9.3.3.1 Enabling the OPC UA server ................................................................................................175
9.3.3.2 Access to the OPC UA server ..............................................................................................177
9.3.3.3 General settings of the OPC UA server................................................................................179
9.3.3.4 Settings of the server for subscriptions.................................................................................181
9.3.3.5 Handling client and server certificates..................................................................................183
9.3.3.6 Generating server certificates with STEP 7..........................................................................190
9.3.3.7 User authentication...............................................................................................................193
9.3.3.8 Users and roles with OPC UA function rights.......................................................................194
9.3.3.9 Diagnostic settings of the server...........................................................................................197
9.3.3.10 License for OPC UA..............................................................................................................198

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9.3.4 OPC UA server interface configuration................................................................................ 199
9.3.4.1 What is a server interface? .................................................................................................. 199
9.3.4.2 Creating a user-defined server interface ............................................................................. 201
9.3.4.3 Using OPC UA companion specifications............................................................................ 206
9.3.4.4 Rules for OPC UA XML files................................................................................................ 213
9.3.4.5 Data types for companion specifications ............................................................................. 214
9.3.4.6 Creating a server interface for companion specification...................................................... 218
9.3.4.7 Creating a server interface for reference namespace ......................................................... 223
9.3.4.8 Notes on configuration limits when using server interfaces................................................. 226
9.3.5 Providing methods on the OPC UA server .......................................................................... 227
9.3.5.1 Useful information about server methods ............................................................................ 227
9.3.5.2 Boundary conditions for using server methods.................................................................... 231
9.3.6 Using diagnostics options .................................................................................................... 233
9.3.6.1 Diagnostics of the OPC UA server....................................................................................... 233
9.3.6.2 Server state transition diagnostics....................................................................................... 235
9.3.6.3 Session state transition diagnostics..................................................................................... 236
9.3.6.4 Check for security events..................................................................................................... 237
9.3.6.5 Request of a remote client failed ......................................................................................... 238
9.3.6.6 Subscription diagnostics ...................................................................................................... 240
9.3.6.7 Summarizing diagnostics..................................................................................................... 243
9.4 Using the S7-1500 CPU as an OPC UA client .................................................................... 245
9.4.1 Overview and requirements................................................................................................. 245
9.4.2 Useful information about the client instructions ................................................................... 246
9.4.3 Number of client instructions that can be used simultaneously........................................... 248
9.4.4 Example configuration for OPC UA ..................................................................................... 249
9.4.5 Creating client interfaces ..................................................................................................... 251
9.4.6 Determine server interface online........................................................................................ 260
9.4.7 Using multilingual texts ........................................................................................................ 264
9.4.8 Rules for the access to structures........................................................................................ 266
9.4.9 Using connection parameter assignment ............................................................................ 268
9.4.9.1 Creating and configuring connections ................................................................................. 268
9.4.9.2 Handling of the client certificates of the S7-1500 CPU........................................................ 272
9.4.9.3 User authentication .............................................................................................................. 275
9.4.9.4 Using a configured connection............................................................................................. 276
9.5 Tips and recommendations.................................................................................................. 284
9.5.1 Rules for subscriptions......................................................................................................... 284
9.5.2 Rules for the user program .................................................................................................. 285
9.5.3 Master copies for OPC UA communication ......................................................................... 286
10 Routing .................................................................................................................................................. 288
10.1 Overview of the routing mechanisms of S7-1500 CPUs ..................................................... 288
10.2 S7 routing............................................................................................................................. 289
10.3 IP forwarding........................................................................................................................ 294
10.4 Data record routing .............................................................................................................. 301
10.5 Virtual interface for IP-based applications ........................................................................... 303

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11 Connection resources............................................................................................................................ 307
11.1 Connection resources of a station ........................................................................................307
11.2 Allocation of connection resources.......................................................................................311
11.3 Display of the connection resources.....................................................................................316
12 Diagnostics and fault correction............................................................................................................. 320
12.1 Connection diagnostics.........................................................................................................320
12.2 Emergency address..............................................................................................................323
13 Communication with the redundant system S7-1500R/H....................................................................... 324
13.1 System IP addresses............................................................................................................325
13.2 Response to Snycup.............................................................................................................331
13.3 Response to primary-backup switchover..............................................................................331
13.4 Connection resources of the redundant system S7-1500R/H ..............................................332
13.5 HMI communication with the redundant system S7-1500R/H..............................................334
13.5.1 HMI connection via the system IP address ..........................................................................334
13.6 Open User Communication with the redundant system S7-1500R/H ..................................336
13.6.1 Setting up the connection of the Open User Communication with the redundant S7-
1500R/H system ...................................................................................................................336
14 Industrial Ethernet Security with CP 1543-1 .......................................................................................... 342
14.1 Firewall..................................................................................................................................343
14.2 Logging .................................................................................................................................344
14.3 NTP client .............................................................................................................................345
14.4 SNMP....................................................................................................................................345
14.5 VPN.......................................................................................................................................346
Glossary ................................................................................................................................................ 347
Index...................................................................................................................................................... 359

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12 Function Manual, 11/2019, A5E03735815-AH
Function manuals Documentation Guide
1
The documentation for the SIMATIC S7-1500 automation system, for CPU 1516pro-2 PN
based on SIMATIC S7-1500, and for the distributed I/O systems SIMATIC ET 200MP,
ET 200SP and ET 200AL is divided into three areas.
This division allows you easier access to the specific information you require.
Basic information
System manuals and Getting Started manuals describe in detail the configuration,
installation, wiring and commissioning of the SIMATIC S7-1500, ET 200MP, ET 200SP and
ET 200AL systems; use the corresponding operating instructions for CPU 1516pro-2 PN.
The STEP 7 online help supports you in configuration and programming.
Device information
Product manuals contain a compact description of the module-specific information, such as
properties, terminal diagrams, characteristics and technical specifications.

Function manuals Documentation Guide
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Function Manual, 11/2019, A5E03735815-AH 13
General information
The function manuals contain detailed descriptions on general topics such as diagnostics,
communication, Motion Control, Web server, OPC UA.
You can download the documentation free of charge from the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109742705).
Changes and additions to the manuals are documented in product information sheets.
You will find the product information on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/us/en/view/68052815)
●ET 200SP (https://support.industry.siemens.com/cs/us/en/view/73021864)
●ET 200AL (https://support.industry.siemens.com/cs/us/en/view/99494757)
Manual Collections
The Manual Collections contain the complete documentation of the systems put together in
one file.
You will find the Manual Collections on the Internet:
●S7-1500/ET 200MP (https://support.industry.siemens.com/cs/ww/en/view/86140384)
●ET 200SP (https://support.industry.siemens.com/cs/ww/en/view/84133942)
●ET 200AL (https://support.industry.siemens.com/cs/ww/en/view/95242965)
"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).
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).

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Product overview
2
CPUs, communications modules and processors, and PC systems of the S7-1500,
ET 200MPET 200SPET 200pro and ET 200AL systems provide you with interfaces for
communication via PROFINET, PROFIBUS and point-to-point connections.
CPUs, communications modules and communications processors
PROFINET and PROFIBUS DP interfaces are integrated in the S7-1500 CPUs. The
CPU 1516-3 PN/DP for example has two PROFINET interfaces and one PROFIBUS DP
interface. Other PROFINET and PROFIBUS DP interfaces are available by using
communications modules (CM) and communications processors (CP).
①
PROFINET interface (X2) with 1 port
②
PROFINET interface (X1) with 2-port switch
③
PROFIBUS DP interface (X3)
④
PROFINET interface (X1) with 3-port switch
Figure 2-1 Interfaces of the CPU 1516-3 PN/DP and CPU 1512SP-1 PN

Product overview
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Function Manual, 11/2019, A5E03735815-AH 15
Interfaces of communications modules
Interfaces of communications modules (CMs) extend the interfaces of CPUs (for example,
the communication module CM 1542-5 adds a PROFIBUS interface to S7-1500 automation
system).
①
PROFIBUS DP interface
Figure 2-2 PROFIBUS DP interface of the CM 1542-5 and CM DP (to an ET 200SP CPU)

Product overview
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16 Function Manual, 11/2019, A5E03735815-AH
Interfaces of communications processors
Interfaces of communication processors (CP) offer additional functionality to what is provided
by the integrated interfaces of the CPUs. CPs allow special applications, for example the
CP 1543-1 provides Industrial Ethernet security functions for protecting Industrial Ethernet
networks via its Industrial Ethernet interface.
①
Industrial Ethernet interface
Figure 2-3 Industrial Ethernet interface of the CP 1543-1

Product overview
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Interfaces of communications modules for point-to-point connections
The communication modules for point-to-point connections provide communication via their
RS 232-, RS 422- and RS 485 interfaces, for example, Freeport or Modbus communication.
①
Interface for point-to-point connections
Figure 2-4 Example of interface for point-to-point connection at the CM PtP RS422/485 BA

Product overview
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18 Function Manual, 11/2019, A5E03735815-AH
Interfaces of interface modules
PROFINET and PROFIBUS DP interfaces of the interface modules (IM) in ET 200MP,
ET 200SP and ET 200AL are used to connect the distributed I/O ET 200MP, ET 200SP and
ET 200AL to PROFINET or PROFIBUS of the higher-level IO controller or DP master.
①
PROFINET interface with 2-port switch
Figure 2-5 PROFINET interfaces IM 155-5 PN ST (ET 200MP), IM 155-6 PN ST (ET 200SP), and
IM 157-1 PN (ET 200AL)
Communications services
The communications services described below use the interfaces and communication
mechanisms provided by the system via CPUs, communication modules and processors.

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Communications services
3
3.1 Overview of communication options
Overview of communications options
The following communications options are available for your automation task.
Table 3- 1 Communications options
Communications options
Functionality
Via interface:
PN/IE1
DP
serial
PG communication
2
On commissioning, testing, diagnostics
X
X
-
HMI communication
2
On operator control and monitoring
X
X
-
Open communication via TCP/IP2Data exchange via PROFINET/Industrial Ethernet
with TCP/IP
Instructions:
•TSEND_C/TRCV_C
•TSEND/TRCV
•TCON
•T_DISCON
X - -
Open communication using ISO-on-
TCP2
Data exchange via PROFINET/Industrial Ethernet
with ISO-on-TCP
Instructions:
•TSEND_C/TRCV_C
•TSEND/TRCV
•TCON
•T_DISCON
X - -
Open communication via UDP2Data exchange via PROFINET/Industrial Ethernet
with UDP
Instructions:
•TSEND_C/TRCV_C
•TUSEND/TURCV
•TCON
•T_DISCON
X - -