Pl-Link Room Bus; Bus Power Supply; Pxc3 Internal Pl-Link Power Supply - Siemens Desigo TRA Mounting And Installation Manual

Note
Parallel operation not
permitted
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Siemens
Building Technologies
9

PL-Link room bus

• The PL-Link bus facilities communications from the PXC3 room automation
station to a maximum 64 PL-Link / KNX bus devices for various manufacturers.
• The PL-Link bus basic version comprises one cable and two stranded bus wires.
• The PXC3 has one internal bus power supply of 160mA.
• The PXC3 also includes an AC 24 V / 2A output for PL-Link / KNX bus devices
with increase power consumption that is supplied via AC 24 V rather than via the
PL-Link bus.
• The PL-Link is physically based on the KNX bus (Konnex).
• In PL-Link networks area/line couplers and IP routers are not admitted.
• Interconnection of PXC3 room automation stations via the PL-Link is not admiss-
ible; the connection is done exclusively via Ethernet switches (Section 8).
• The polarity of the PL-Link bus conductors must be respected
(terminals PL+ and PL–)
In most countries, specific /KNX know-how is transmitted through training centers
certified by the EIBA (see
9.1

Bus power supply

A bus power supply is required for bus communications. Throttled voltage DC 29 V
is used.
9.1.1

PXC3 internal PL-Link power supply

The PXC3 room automation station has an internal bus power supply of 29 V / 160
mA. The ABT recognizes if any devices are connected to the PL-Link rail (auto
detection) and the PXC3 then switches the power supply on. If an external supply
is used, the internal supply must be switched off manually in the ABT (PL-
Link rail properties), as parallel operation is not permitted.
Bus power and the PL-Link bus are galvanically isolated from device electronics for
devices with bus power.
Parallel operation of the internal PL-Link bus supply with an external bus power
supply is not permitted.
The internal bus power supply must be switched off in ABT when an external bus
power supply is used. Default = "Auto Detection".
Mounting and installation
PL-Link room bus
www.eiba.com or www.konnex.org).
CM111043en_03
2013-02-23