Dali Network; Bus Power Supply; Bus Topologies - Siemens Desigo TRA Engineering, Mounting And Installation Manual

Additional information
Supply is compulsory
Power consumption
PXC3
Notes
64 operational devices
in a circuit
Permissible bus
topologies
Siemens
Building Technologies
13

DALI network

The DALI network allows the PXC3 room automation station to a maximum 64
DALI operational devices.
The DALI network comprises one cable and two stranded bus wires. The mains
power may also be available in the same cable (L, N, PE).
The PXC3 possesses a DALI bus supply of 128mA to power up to 64 DALI
operational devices.
Detailed information is available on the DALI homepage at www.dali-ag.org.

13.1 Bus power supply

A bus power supply is required for bus communications.
PXC3 room automation stations each have switchable (via the ABT) bus supply of
16 V / 128 mA. They are switched on at the factory.
Parallel switching with an external power supply is NOT permitted.
An external power supply cannot be connected if the internal power supply is
switched off.
Power consumption of all operational devices on the DALI circuit may not
exceed 128 mA (64 x 2 mA).
Bus power and the DALI bus must be galvanically isolated from device
electronics for devices with bus power.

13.2 Bus topologies

Up to 64 DALI operational devices may be installed on one DALI circuit. No
restrictions apply to the type mix.
Permissible bus topologies are: Tree, line, and star topologies. These topologies
can be mixed as needed. However, ring topologies are not allowed.
Tree topology (with stub lines)
N2
N1
DALI
N6
N1 .. N7 Operational devices
Desigo TRA Engineering, mounting and installation
DALI network
Line topology (with loops)
N3 N4
N5
N7
N2
N1
DALI
N3
CM111043en_09
N4
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2016-02-22