User Manual

Network architecture
KNX architecture (ALN)
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KNX can use twisted pair cables, radio frequency (RF) or data transmission networks in connection with
the Internet Protocol for communication between the devices. KNX has links and interfaces for connection
to Ethernet/IP, RF, lighting control with DALI and building automation and control systems.
Structure
The following figure shows the structure of the KNX network:
● KNX: KNX devices, e.g., third-party KNX
● PX KNX: Automation station PXC001.D or PXC001-E.D and PX KNX firmware
Line
A KNX network consists of lines. Up to 64 devices can be connected to each line.
Area
Up to 15 lines can be connected to a main line via line couplers (LC). This is called an area.
Backbone line
The topology can be expanded by means of a backbone line. Up to 15 areas can be connected to the
backbone line via backbone couplers (BC). Technically, these are the same devices as line couplers.
Line/Backbone couplers
Couplers separate the areas and lines. Couplers keep the bus traffic within bounds. Datagrams that are
only needed on one line should not create a load on the entire network and hence have to be confined to
that line. Respective filter tables are created (ETS) when setting up the project/network.
Engineering Tool Software (ETS)
The KNX Engineering Tool Software (ETS) is used to create KNX projects. A bus interface is required to
commission the devices with ETS.
For a detailed description of the KNX topology, see
http://www.knx.org/fileadmin/template/documents/downloads_support_menu/KNX_tutor_seminar_page/
basic_documentation/Topology_E1212c.pdf.
System Devices
PX KNX
The PX KNX system controller maps KNX devices to BACnet objects. PX KNX also supports different
system functions, such as grouping, scheduling, alarming, trending, etc.
EIB
EIB
EIB
EIB
EIB
EIB
Backbone line
Area 1 Area 3
Backbone
coupler
(1.0.0)
Backbone
coupler
(2.0.0)
Backbone
coupler
(3.0.0)
PX KNX
(0.0.y)
PX KNX
(3.0.y)
PX KNX
(3.1.y)
Line
coupler
(3.1.0)
Line
coupler
(3.2.0)
Line 1
Line 2