Siemens S7 Series Use and care manual

Communication with
S7 CPU via KNX
Gateway
S7-1200, S7-1500, PROFINET, “Triple-X PROFINET +
KNX” Universal Gateway
https://support.industry.siemens.com/cs/ww/en/view/109739689
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Industry
Online
Support

Warranty and Liability
Communication with S7 CPU via KNX Gateway
Entry ID: 109739689, V1.0, 06/2017
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Warranty and Liability
Note
The Application Examples are not binding and do not claim to be complete
regarding the circuits shown, equipping and any eventuality. The Application
Examples do not represent customer-specific solutions. They are only intended
to provide support for typical applications. You are responsible for ensuring that
the described products are used correctly. These Application Examples do not
relieve you of the responsibility to use safe practices in application, installation,
operation and maintenance. When using these Application Examples, you
recognize that we cannot be made liable for any damage/claims beyond the
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If there are any deviations between the recommendations provided in these
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described in this Application Example shall be excluded. Such an exclusion shall
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Any form of duplication or distribution of these Application Examples or excerpts
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informa-
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Table of Contents
Communication with S7 CPU via KNX Gateway
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Table of Contents
Warranty and Liability ................................................................................................. 2
1Task..................................................................................................................... 4
1.1 Introduction........................................................................................... 4
1.2 Overview of the automation task.......................................................... 4
2Solution............................................................................................................... 5
2.1 Overview............................................................................................... 5
2.2 Description of the core functionality..................................................... 7
2.3 Hardware and software components ................................................... 8
3Mode of Operation........................................................................................... 10
3.1 Data points and signal chart............................................................... 10
3.2 Data point mapping............................................................................ 11
3.3 Correlation of the gateway configuration files.................................... 12
4Configuration and Project Engineering......................................................... 14
4.1 STEP 7 (TIA Portal) device configuration .......................................... 14
4.2 Gateway: Setting the LAN IP address................................................ 16
4.3 Gateway: Data backup....................................................................... 18
4.4 Gateway: Editing configuration files................................................... 19
4.4.1 Editing in the integrated web server................................................... 19
4.4.2 Configuration files............................................................................... 20
4.4.3 “eib1.cfg” gateway file ........................................................................ 20
4.4.4 “eib1.txt” gateway file ......................................................................... 21
4.4.5 “pnetd1.txt” gateway file..................................................................... 22
4.4.6 “pnetd1.cfg” gateway file .................................................................... 23
4.4.7 “dispatch.txt” gateway file................................................................... 24
4.5 Gateway: Overview of the configuration ............................................ 25
4.6 Gateway: Restart................................................................................ 26
5Installation and Commissioning .................................................................... 27
5.1 Installing the software......................................................................... 27
5.2 Installing the hardware....................................................................... 27
5.2.1 Installation under laboratory conditions.............................................. 27
5.2.2 Installation under plant conditions...................................................... 28
5.3 Commissioning................................................................................... 29
5.3.1 Commissioning the gateway .............................................................. 29
5.3.2 Commissioning the S7-1200 CPU ..................................................... 31
6Operation of the Application Example .......................................................... 33
7Links & Literature ............................................................................................ 35
8MBS GmbH –Contact...................................................................................... 35
9History............................................................................................................... 36

1 Task
Communication with S7 CPU via KNX Gateway
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1 Task
1.1 Introduction
Gateways enable communication between two networks/bus systems that use
different communications protocols.
KNX is a fieldbus for building automation. Technically, KNX is the successor to the
European Installation Bus (EIB), adding communication mechanisms and
transmission media.
The functionality of a KNX system can be extended by integrating an S7 CPU into
a KNX system via a gateway. An S7 CPU enables the use of various functions and
statements for creating a control program and processing data.
The “LGF (Library of general functions)” for STEP 7 (TIA Portal) and S7-1200 / S7-
1500 additionally provides complementary functions such as an astronomical clock,
weekly timer, FIFO and many more (see \4\).
1.2 Overview of the automation task
The task is to establish, using a KNX gateway, a communication connection
between an S7 CPU via PROFINET (PN) and a KNX device via the KNX bus.
Each KNX device has a physical address (PA) via which the device can be
accessed. The individual functions of a KNX device are addressed by group
addresses (GA).
Through bidirectional data exchange between a KNX gateway and an S7 CPU,
signals of a KNX device are to be processed in the S7 CPU or KNX devices are to
be controlled using the S7 CPU.
The figure below provides an overview of the automation task.
Figure 1-1: Block diagram of the automation task
KNX devices
KNX
gateway
PROFINET
SIMATIC
CPU
KNX

2 Solution
Communication with S7 CPU via KNX Gateway
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2 Solution
2.1 Overview
Diagrammatic representation
Representing all SIMATIC controllers, this solution uses an S7-1200 CPU. The
diagrammatic representation below shows the most important components for
communication between an S7-1200 CPU and a KNX network using the “Triple-
X PROFINET + KNX” universal gateway from MBS GmbH.
Figure 2-1: Block diagram of the solution with the components used
“Triple-X PROFINET+KNX”
universal gateway
PROFINET
KNX devices
S7-1200 CPU
KNX
The “Triple-X PROFINET + KNX” universal gateway enables communication
between an S7-1200 CPU and KNX devices via PROFINET and the KNX bus.
In this example, the KNX devices consist of:
KNX wall switch triple
KNX room control unit
KNX power supply
1
Correct communication is verified with the KNX devices and a STEP 7 (TIA Portal)
watch table.
1
An external KNX power supply is necessary for operating a KNX network and is no
communication node in the network.

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Communication with S7 CPU via KNX Gateway
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The following table shows the relevant interfaces of the gateway for this application
example:
Table 2-1: Gateway interfaces
Interface label
Communication
medium
Network
Connected device
PROFINET 1 or
PROFINET 2
Ethernet
PROFINET
SIMATIC CPU
(S7-1200 CPU)
LAN
Ethernet
LAN
PG / PC
KNX
Twisted pair cable
KNX
KNX devices (incl. KNX
power supply)
Advantages
The solution presented here offers the following advantages:
Easy adaptation to other controller families. Representing all other SIMATIC
controllers with a PROFINET IO interface, this solution uses the S7-1200 CPU.
Easy adaptation when expanding plants. The gateway is configured directly in
the gateway’s integrated web server.
Integration of the gateway as a PROFINET IO device via a GSD file.
Gateway as distributed I/O with up to 340 bytes of input and 340 bytes of
output.
Up to 2500 data points possible for communication between PROFINET and
KNX.
Scope
This document does not replace the gateway manual. If there are any
differences in the documentation, the documentation provided by MBS GmbH
always takes precedence.
This application example only describes how to get started with KNX
communication with SIMATIC CPUs using a KNX gateway. For more
information about the KNX gateway, please refer to the gateway manual or
directly contact MBS GmbH.
Configuring the KNX devices using the ETS
2
software and communication
between the gateway and the KNX devices are not part of this application
example.
Sales, distribution, training, service and support for the “Triple-
X PROFINET + KNX” universal gateway are provided exclusively by
MBS GmbH.
Required knowledge
Basic knowledge of STEP 7 (TIA Portal) programming and project engineering
Basic knowledge of PROFINET communication and configuration
Basic knowledge of the ETS software, KNX communication and KNX group
addresses
2
Engineering Tool Software (ETS) for programming nodes and assigning group addresses in a
KNX network.

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Communication with S7 CPU via KNX Gateway
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2.2 Description of the core functionality
Configuration
The connection between the S7-1200 CPU and the gateway is configured via
the configuration of the gateway as distributed I/O in STEP 7 (TIA Portal).
configuration files of the gateway (cfg and txt files) (see Figure 3-3) that
reference each other.
The configuration files are downloaded to the gateway using the integrated web
server or directly edited.
Configuring and programming the gateway requires no ETS software. The gateway
can access existing data points (group addresses) in the KNX network and provide
its own data points locally on the gateway.
The assignment of the devices’ group addresses and physical addresses is not
part of this description. For more information, please refer to the supplied ETS5
sample project. The gateway’s physical address (KNX) is set using the “eib1.cfg”
configuration file (see 4.4.3).
Function and data types
This application example contains a STEP 7 project and a data record for the
gateway, where data of different data types is exchanged between an S7-1200
CPU and KNX devices in both directions via the gateway. A decimal value is
transferred from the S7-1200 CPU to the KNX control room unit’s display and a
status LED of the KNX wall switch is controlled via a binary signal. Conversely, the
value of the integrated temperature sensor and a configurable decimal value are
transferred from the KNX room control unit. Using the KNX wall switch, a boolean
variable is set/reset in the S7-1200 CPU.
The following data types are used and parameterized:
Table 2-2: SIMATIC / gateway data types
SIMATIC (S7-1200
CPU)
Gateway
KNX
PROFINET
KNX
BOOL
↔
BIT
UINT1
↔
DPT-1
INT
↔
SINT16
SINT16
↔
DPT-7
REAL
←
FLOAT32
SFLOAT
←
DPT-9

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Communication with S7 CPU via KNX Gateway
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2.3 Hardware and software components
This application example was created with the following components:
Hardware components
Table 2-3: Hardware components
Component
No.
Article number
Note
POWER MODULE
PM1207
1
6EP1332-1SH71
Power supply
input: 120/230 V AC
output: 24 V DC/2.5 A
SIMATIC S7-1214C
DC/DC/DC FW4.2
1
6ES7214-1AG40-
0XB0
Alternatively, any other S7-1200
CPU (FW4.1 or higher) or S7-
1500 CPU (FW1.7 or higher) can
be used.
Compact Switch
Module
1
6GK7277-1AA00-
0AA0
(optional)
The switch is only required if you
want to simultaneously access
(without “replugging”) the S7-1200
and the gateway from the PG/PC.
“Triple-X PROFINET +
KNX”
universal gateway
(RS485)
1
Manufacturer: MBS
GmbH
Operating system:
Linux 2.6.34.7 #267
Software module:
V2_05W
Hardware module:
15.1.1
http://www.mbs-
solutions.de/profinet-knx
For the versions on the left, visit
the gateway web server’s page,
“Help > Device info”.
Alternative: RS232
Siemens Gamma KNX
room control unit
1
5WG1227-2AB11
Operating and installation
instructions
https://support.industry.siemens.c
om/cs/ww/en/view/76776544
Siemens Gamma KNX
wall switch triple
1
5WG1223-2DB13
-
Siemens Gamma KNX
bus coupling unit
1
5WG1117-2AB12
-
Siemens Gamma KNX
power supply
1
5WG1125-1AB01
Siemens Gamma KNX
USB interface
1
5WG1148-1AB12
Optional. Interface for
programming the KNX devices.

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Communication with S7 CPU via KNX Gateway
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Software components
Table 2-4: Software components
Component
No.
Article number
Note
SIMATIC STEP 7
Professional V14 (TIA
Portal)
1
6ES7822-1..04-..
-
GSDML-V2.31-MBS-
MICRO3004-20150206
1
Manufacturer: MBS
GmbH
The latest GSDML files are
available directly from MBS
GmbH.
The GSDMLV2.31 file was
used in this example. The
files are available in the
“AdditionalFiles – GSD”
folder in the STEP 7 project.
When opening the project,
the GSD file is installed
automatically.
ETS5 Demo
1
https://www.knx.org/kn
x-
en/software/ets/downl
oad/index.php
Maximum of 5 KNX devices
per project.
Sample files and projects
The following list contains all files and projects that are used in this example.
Table 2-5: Download files
Component
Note
109739689_KNX_DOC_V10_en.pdf
This document
109739689_KNX_S7_PROJ_V10.zip
This .zip file contains the
“MBS_KNX” STEP 7 project.
109739689_KNX_Gateway_RestoreFile_V10.zip
This zip file contains the
“ugwbackup.tgz” gateway
data backup with the
configuration files.
109739689_KNX_ETS5_PROJ_V10.zip
This .zip file contains the
ETS5 project.

3 Mode of Operation
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3 Mode of Operation
The data between the two bus systems, PROFINET and KNX, is exchanged
between the drivers (PROFINET, KNX) in the gateway via data point mapping.
The data points are described in the pnetd1.txt and eib1.txt configuration files and
mapped to each other in the dispatch.txt dispatch file.
For each data point, the format specifies how the driver should interpret the data at
the data point address.
3.1 Data points and signal chart
Each interface of a device (CPU, KNX) that is used to transfer data represents a
data point. As the gateway connects two different bus systems, it has two data
points –the source data point and the target data point.
The example in the following figure shows a signal that is generated in the S7-1200
CPU and transmitted to the gateway via PROFINET. The gateway converts the
PROFINET signal to a KNX telegram and sends it to the appropriate group address
of the KNX device. In the same way, a signal can also be transmitted from a KNX
device to the S7-1200 CPU.
Figure 3-1: S7-1200 CPU KNX device –signal chart
E
PROFINET KNX
Gateway
Q
outbit
outbyte
GA
S7-1200 CPU KNX device
Signal chart
Q
Signal
Data point
E
GA
E
PROFINET KNX
Q Output
GA Group address
For the KNX driver and all other gateway drivers, the following types apply to the
definition of the data types:
Table 3-1: Definition of the data point types
Type
Meaning
M
Integer value (binary data points, counts) that can only be read by the gateway.
S
Integer value that can be read and written by the gateway.
X
Analog value (with decimal places) that can only be read by the gateway.
Y
Analog value (with decimal places) that can be read and written by the gateway.
For a definition of “data points”, please refer to the gateway manual (\3\), section 6
“Protocol properties and data points”.

3 Mode of Operation
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3.2 Data point mapping
The following figure shows all of the data used and the process image of the S7-
1200 CPU for the configuration with the gateway.
Please note: The input or output signal type always refers to the “perspective” of
the respective device.
Figure 3-2: Interaction between the process image of the S7 CPU and the data points in the gateway
OW 100
IW 100
O 102.0
O 102.0
setValInt
readValInt
setValBool
readValBool
PLC tags
Gateway
Name Data type
Length Address Name AddressFormat Length
PROFINET
S7-1200 CPU
Integrated
I/O
KNX-->S7
value S inbyte 0SINT16
2 bytes
S7-->KNX
statusLED M outbit 2.0BIT 1 bit
KNX-->S7
switch S inbit 2.0BIT 1 bit
S7-->KNX
value M outbyte 0
SINT16
2 bytes
INT
2 bytes
INT
2 bytes
BOOL
1 bit
BOOL
1 bit
PROFINET AddressFormat
Length
M 1/1/1SINT16
2 bytes
S 1/1/4
UINT1
1 bit
M 1/1/3UINT1
1 bit
S 1/1/2SINT16
2 bytes
EIB/KNX KNX
Process image
PLC_1 DI14 I0 *
I/O Address
INPUT_32B_1 I
100..131
OUTPUT_32B_1 O
100..131
O0 *
PLC_1 DO10_1
Data points
KNX devices
(wall switches, actuators…)
ID 103
readTemprInt REAL
4 bytes KNX-->S7
temperature Y inbyte 3
FLOAT32
4 bytes X 1/1/5SFLOAT 2 bytes
Note
*Compact CPUs (e.g., S7-1200) with integrated digital inputs and outputs:
In STEP 7 (TIA Portal), the smallest address 0 is automatically assigned to the
integrated digital inputs and outputs.
Other modules / I/O are automatically assigned to the next available address.
Here, the address space starting with 100 was selected in the process image.
This makes it easier to identify the connected tags between the S7-1200 CPU
and the gateway.

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3.3 Correlation of the gateway configuration files
The gateway is configured using various configuration files (cfg, txt files). Once
programming is complete, these files are uploaded in a text editor (for example,
Notepad++) using the integrated web server in the gateway or directly edited and
enabled in the integrated web server. A configuration check is performed in the
gateway and any errors are displayed.
As the gateway supports different bus systems (PROFINET, KNX, BACnet…),
there are different driver files with protocol information (files with the .cfg extension)
and a file with the definition of the data points (.txt extension).
The dispatch file (dispatch.txt) is an integral part. It contains the mapping of the
data points of the different protocols to each other.
The data points are programmed as objects. For the exact meaning and structure
of these files, please refer to the gateway manual (\3\). The gateway data backup
cfg and txt files also contain this information as comment lines.
For the complete configuration, please refer to the supplied “ugwbackup.tgz”
gateway data backup in the “ugw > config” folder and the included comments
(109740160_KNX_Gateway_RestoreFile_Vxx.zip).
Figure 3-3: Gateway configuration files
pnetd1.cfg
PROFINET
pnetd1.txt dispatch.txt eib1.cfg
KNX
Protocol
information Definition of
data points Definition of
data points Protocol
information
Assignment between
data points
eib1.txt
Table 3-2: Gateway configuration files
File
Contents
Description
pnetd1.cfg
PROFINET protocol
information
This file contains information and settings
for the PROFINET network, including the
I/O used in the network.
Here: I/O configuration of the gateway in
STEP 7 (TIA Portal)
pnetd1.txt
Definition of the
PROFINET data points
Defines how and with which data type the
data points are interpreted.
dispatch.txt
Assignment between
KNX data points and
PROFINET data points
This file describes the assignment of the
data points between the PROFINET side
(pnetd1.txt) and the KNX side (eib1.txt).
eib1.txt
Defines the KNX data
points
This file contains the description of the
individual data points on the KNX side.
eib1.cfg
KNX protocol
information
This file contains information and settings
for the KNX protocol.

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Note
In the gateway configuration files, KNX objects are identified by “eib…” and
PROFINET objects are identified by “pnetd…”.
This application example describes how to edit and customize these files so that
they can be used for data exchange (see Chapter 4.4 Gateway: Editing
configuration files). Along with this description, you are provided with a data backup
file with the ready-to-use sample files that you can customize for your own
application.
Note
In addition, the following configuration files exist that need to be downloaded to
the gateway but not edited:
driver.cfg
ugwc1.cfg
ugwc1.txt
gateway.cfg
ntp.cfg
plants.cfg
These files are not described in greater detail in this application. If you require
more information, please contact MBS GmbH.

4 Configuration and Project Engineering
Communication with S7 CPU via KNX Gateway
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4 Configuration and Project Engineering
This chapter describes the configuration in STEP 7 (TIA Portal) and the
programming of the gateway configuration files.
If you want to use the sample configuration of this application example without any
changes, you can download the STEP 7 project directly to the S7-1200 CPU and
the gateway configuration to the gateway (see Chapter 5.3.1 Commissioning the
gateway).
4.1 STEP 7 (TIA Portal) device configuration
Note
Before you can configure the gateway in STEP 7 (TIA Portal), you must install
the gateway’s GSD file. The GSD file can be found on the gateway’s web user
interface, “Profinet > GSDML file”. \6\ provides a description of how to install a
GSD file in TIA Portal.
When you open the supplied “MBS_KNX” STEP 7 project, the GSD file is
installed automatically, see 5.3.2 Commissioning the S7-1200 CPU.
Table 4-1: Device configuration in STEP 7 (TIA Portal)
No.
Action
Comment
1.
Create a STEP 7 (TIA Portal) project and
insert an S7-1200 CPU (S7-1214C DC/DC/DC
FW4.2).
Requirement: You have STEP 7 (TIA Portal)
V14 or higher installed on your computer.
2.
In “Devices & networks”, open the “Network
view”.
In the hardware catalog, navigate to “Head
module”, “UGW-micro”.
Make sure that the firmware version (V2.31) is
correct.

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No.
Action
Comment
3.
Use drag and drop to move the “UGW-micro”
from the hardware catalog to the “Devices &
networks” editor.
4.
Click “Not assigned”) for the UGW-micro and
select the interface of the S7-1200 CPU used
(“PLC_1.PROFINET…”).
5.
Set the following PROFINET IP address:
S7-1200 CPU: 192.168.0.1
UGW-micro: 192.168.0.2
6.
Double-click the UGW-micro to open the
UGW-micro device view.
7.
Open the hardware catalog and navigate to
the gateway’s input/output modules.
Equip the UGW-micro with the required
modules.
Change the I/Q addresses to the range
starting with 100.
8.
Create a PLC tag table, for example
“TagsUGW”, as shown in the figure on the
right.
9.
Create the watch table, for example
“WatchTableUGW”, to monitor and modify the
tags.
Note
As the tags directly access the process image, no system blocks (SFC, SFB) are
necessary.

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4.2 Gateway: Setting the LAN IP address
Table 4-2: Setting the IP address of the gateway
No.
Action
Comment
1.
Make sure that
your computer is in the same subnet as all
the components involved,
all the components are connected using
LAN cables,
all the components are connected to a
power supply and turned on.
See Chapter 5.2 Installing the hardware
2.
Start your preferred web browser and connect
to the gateway web server.
Factory default:
IP address: 169.254.0.1
User name: gw
Password: GATEWAY
3.
Select “General > IP-Network” to set the IP
address of the gateway’s LAN interface.
4.
1. Change the IP address.
2. Select “Save” to save the setting.
Note
After saving, you need to reconnect to the
gateway using the new IP address you have
just set.
Note
For successful communication with the
gateway, the IP address of your PC must be in
the same subnet. If necessary, change the IP
address of your PC.

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No.
Action
Comment
5.
When you have logged back on to the gateway
using the new IP address, a complete system
restart is required.
Click the “Restart required!” button to perform
a restart.
Use the “complete system restart” option to
restart the gateway as described in Chapter
4.6.

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4.3 Gateway: Data backup
Table 4-3: Perform the gateway data backup
No.
Action
Comment
1.
Make sure that
your computer is in the same subnet as all
the components involved,
all the components are connected using
LAN cables,
all the components are connected to a
power supply and turned on.
See Chapter 5.2 Installing the hardware
2.
Start your preferred web browser and connect
to the gateway web server.
Default settings:
IP address: 169.254.0.1
User: “gw”
Password: “GATEWAY”
3.
If necessary, back up all gateway configuration
files using the “Backup/Restore” menu that
allows you to restore the default settings if
necessary (see the “Help > Online help” UGW
menu item).
To back up data, navigate to “General >
Backup/Restore > Backup gateway
configuration”.
Click “Start” and follow the menu prompts.

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4.4 Gateway: Editing configuration files
This chapter provides a detailed description of the structure and editing of the
gateway configuration files.
You can edit the files directly in the integrated web server or download the files,
edit them with a text editor (for example, Notepad++) and then upload them back to
the gateway.
Chapter 3.3 Correlation of the gateway configuration files provides you with an
overview of how the configuration files correlate.
4.4.1 Editing in the integrated web server
The following instructions describe how to edit the configuration files directly in the
integrated web server.
Table 4-4: Editing in the integrated web server
No.
Action
Comment
1.
From the top menu bar, select “EIB” to edit the
configuration files for the KNX protocol.
Alternative: From the top menu bar, select
“Profinet” to edit the files of the PROFINET
protocol.
2.
From the left menu bar, select “Files”.
3.
Click the Edit icon of the configuration file you
want to edit.
4.
A new window opens where you can make the
changes.
Click “Save” to save the changes.
5.
After saving, the window closes automatically
and the “Restart required!” message appears.
Restart the gateway as described in Chapter
4.6.

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4.4.2 Configuration files
For the configuration of the gateway, the following files are edited and then
downloaded to the gateway using the integrated web server or directly edited in the
integrated web server.
pnetd1.cfg
pnetd1.txt
eib1.cfg
eib1.txt
dispatch.txt
4.4.3 “eib1.cfg” gateway file
The KNX protocol settings are made in the “eib1.cfg” configuration file.
Table 4-5: Structure of the “eib1.cfg” gateway file
No.
Description
Comment
1.
Make the necessary parameter settings such
as the physical address in the KNX network
(PhysicalAddress). The physical address
must be freely available in the KNX network.
You can also keep the default setting.
For a detailed description of the individual
parameters, please refer to the “eib1.cfg” file’s
comment.
…
[EIB]
Baudrate = 38400
Queuesize = 2000
ForceAuto = 0
MonitorMode = 0
AliveCheck = 0
BcuType = 2
PhysicalAddress = 1.1.99
…