Assortment / System Description

Technical principles, terms
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Room automation stations have a fixed number of I/O data points for
connecting field devices as well as an interface to KNX. The automation
stations are supplied with pre-loaded applications that only need be configured.
A comprehensive library with tested, standardized applications is available that
can be used instead of the pre-loaded applications. Buttons, sensors, and
actuators for lighting and shading are connected to the room automation
station via the KNX PL-Link.
Both preloaded as well as tested standardized applications in the library are
configured in ABT Site and offer a high degree of flexibility, since, in addition to
the functions, even inputs and outputs on the DXR2… can be configured.
DXR2 room automation stations:
● DXR2 assume the control functions for a room.
● DXR2s communicate with each other or other system components via
BACnet/IP or MS/TP. Scope and functionality of supported BACnet objects
are matched to the requirements of room automation.
● DXR2s provide a 2-port Ethernet interface for cost-effective cabling via line
topology.
● DXR2s receive bus power for the KNX PL-Link. Internal bus power can be
extended needed with an external supply module.
The KNX PL-Link (Peripheral Link) connects communicating room and field
devices (room devices, sensors, actors) to the DXR2 room automation station.
Plug&play allows for connecting selected Siemens field devices to the KNX PL-
Link using plug and play.
KNX PL-Link is not suitable for KNX subsystem integration, as communication
is not directly between field devices but field devices and room automation
station.
The DXR2 has its own KNX PL-Link has bus-internal supply allowing for cost-
effective installation without requiring additional wiring. The 2-wire bus allows
for connecting up to 64 devices.
DXR2 applications include an optimum set of preconfigured devices. They
support simple engineering.
KNX PL-Link provides extended functionality and additional diagnostic
functions compared to direct connected field devices.
In Desigo room automation, numerous system elements and system data are
grouped by means of grouping functions.
● Groups allow structuring and central control of system elements and data.
● Groups support data exchange between central control functions and
individual system elements.
System elements and data can be grouped by either geographical, functional, or
discipline-specific criteria.
Typical reasons for exchanging data within a group:
● Distributing common group data by central function.
● Collecting data from individual group elements.
● Calculating resulting group data via central function.
● Merging room segments to multiple DXR2s into one large room
DXR2
KNX PL-Link
Groups