Siemens S7 Series, S7-1200, S7-1500 Communication Instruction 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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Warranty and Liability

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

Note

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Table of Contents

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

Table of Contents

Warranty and Liability ................................................................................................. 2

1 Task ..................................................................................................................... 4

1.1 Introduction ........................................................................................... 4

1.2 Overview of the automation task .......................................................... 4

2 Solution............................................................................................................... 5

2.1 Overview............................................................................................... 5

2.2 Description of the core functionality ..................................................... 7

2.3 Hardware and software components ................................................... 8

3 Mode 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

4 Configuration 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

5 Installation 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

6 Operation of the Application Example .......................................................... 33

7 Links & Literature ............................................................................................ 35

8 MBS GmbH – Contact ...................................................................................... 35

9 History............................................................................................................... 36

1 Task

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

KNX devices

KNX

gateway

PROFINET

SIMATIC

CPU

KNX

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 / S71500 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

2 Solution

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

“Triple-X PROFINET+KNX” universal gateway

PROFINET

KNX devices

S7-1200 CPU

KNX

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 “TripleX PROFINET + KNX” universal gateway from MBS GmbH.

Figure 2-1: Block diagram of the solution with the components used

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 supply1

Correct communication is verified with the KNX devices and a STEP 7 (TIA Portal) watch table.

An external KNX power supply is necessary for operating a KNX network and is no

communication node in the network.

2 Solution

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

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 following table shows the relevant interfaces of the gateway for this application example:

Table 2-1: Gateway interfaces

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 ETS2 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

Engineering Tool Software (ETS) for programming nodes and assigning group addresses in a

KNX network.

2 Solution

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

SIMATIC (S7-1200

CPU) Gateway

KNX

PROFINET

KNX

BOOL

↔

BIT

UINT1 ↔ DPT-1

INT

↔

SINT16

SINT16 ↔ DPT-7

REAL

←

FLOAT32

SFLOAT ← DPT-9

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

2 Solution

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

Component

No.

Article number

Note

POWER MODULE PM1207

6EP1332-1SH71

Power supply input: 120/230 V AC output: 24 V DC/2.5 A

SIMATIC S7-1214C DC/DC/DC FW4.2

6ES7214-1AG400XB0

Alternatively, any other S7-1200 CPU (FW4.1 or higher) or S71500 CPU (FW1.7 or higher) can be used.

Compact Switch Module

6GK7277-1AA000AA0

(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)

Manufacturer: MBS GmbH

Operating system: Linux 2.6.34.7 #267 Software module: V2_05W Hardware module:

15.1.1

http://www.mbssolutions.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

5WG1227-2AB11

Operating and installation instructions

https://support.industry.siemens.c om/cs/ww/en/view/76776544

Siemens Gamma KNX wall switch triple

5WG1223-2DB13

Siemens Gamma KNX bus coupling unit

5WG1117-2AB12

Siemens Gamma KNX power supply

5WG1125-1AB01

Siemens Gamma KNX USB interface

5WG1148-1AB12

Optional. Interface for programming the KNX devices.

2.3 Hardware and software components

This application example was created with the following components:

Hardware components

Table 2-3: Hardware components

2 Solution

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

Component

No.

Article number

Note

SIMATIC STEP 7 Professional V14 (TIA Portal)

6ES7822-1..04-..

GSDML-V2.31-MBSMICRO3004-20150206

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

https://www.knx.org/kn xen/software/ets/downl oad/index.php

Maximum of 5 KNX devices per project.

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.

Software components

Table 2-4: Software components

Sample files and projects

The following list contains all files and projects that are used in this example.

Table 2-5: Download files

3 Mode of Operation

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

PROFINET KNX

Gateway

outbit

outbyte

S7-1200 CPU

KNX device

Signal chart

Signal

Data point

PROFINET KNX

Q Output

GA Group address

Type

Meaning

Integer value (binary data points, counts) that can only be read by the gateway.

Integer value that can be read and written by the gateway.

Analog value (with decimal places) that can only be read by the gateway.

Analog value (with decimal places) that can be read and written by the gateway.

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

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

For a definition of “data points”, please refer to the gateway manual (\3\), section 6 “Protocol properties and data points”.

3 Mode of Operation

Communication with S7 CPU via KNX Gateway Entry ID: 109739689, V1.0, 06/2017

OW 100

IW 100

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

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

I 0 *

I/O Address

INPUT_32B_1 I

100..131

OUTPUT_32B_1 O

100..131

O 0 *

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.

3.2 Data point mapping

The following figure shows all of the data used and the process image of the S71200 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

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Siemens S7 Series, S7-1200, S7-1500 Communication Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Communication with S7 CPU via KNX Gateway

Warranty and Liability

1 Task

1.1 Introduction

1.2 Overview of the automation task

2 Solution

2.1 Overview

2.2 Description of the core functionality

2.3 Hardware and software components

3 Mode of Operation

3.1 Data points and signal chart

3.2 Data point mapping