Task; Introduction; Overview Of The Automation Task - Siemens S7 Series Communication Instruction Manual

1 Task

Task
1
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
SIMATIC
CPU
Communication with S7 CPU via KNX Gateway
Entry ID: 109739689, V1.0,
PROFINET
06/2017
KNX
gateway
KNX devices
KNX
4