User Manual

Network architecture
KNX PL-Link architecture (FLN)
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Up to 15 lines can be connected to a main line via line couplers (LC). This is
called an area.
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.
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.
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
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.
The system controller must be positioned correctly in relation to the topology
and the load on the bus caused by the devices and connections (group
addresses).
Each line and each area must include a bus power supply.
14.4 KNX PL-Link architecture (FLN)
KNX PL-Link (PeripheraL-Link) connects communicating room and field
devices (room devices, sensors, actors) with the PXC3 room automation station
and the DXR2 compact room automation station. KNX PL-Link fully complies
with the KNX standard.
Siemens field devices can be connected to the KNX PL-Link using the KNX PL-
Link plug & play capability. KNX PL-Link devices are configured using the
Desigo tools. The KNX commissioning software (ETS) is not needed.
One or more KNX PL-Link devices are connected to the trunk of the
corresponding room automation station in a line topology.
A comprehensive library with preconfigured devices supports simple
engineering.
The PXC3 room automation station allows for simultaneous integration of
devices with KNX PL-Link and KNX S-Mode on a single bus line. Devices with
KNX S-Mode are additionally commissioned using ETS.
Structure
The following figure shows an example of a logical network topology with KNX
PL-Link devices, a room automation station and several rooms.
Area
Backbone line
Line/Backbone couplers
Engineering Tool
Software (ETS)
PX KNX
Bus power supply