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Introduction
Power consumption
PXC3
Notes
64 operational devices
in a circuit
Permissible bus
topologies
36 / 56
Siemens
Building Technologies
10
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.
For basic and planning know-how see the DALI manual:
http://www.dali-ag.org/c/manual_gb.pdf.
10.1 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.
10.2 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
Mounting and installation
DALI network
Line topology (with loops)
N3
N4
N5
N7
N2
N1
DALI
N3
CM111043en_03
N4
2013-02-23
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