Technical Data Knx Pl-Link - Siemens Desigo TRA Engineering, Mounting And Installation Manual

KNX bus
Communication signal
KNX bus cable
Note
Bus power supply
Max. number of devices
62 / 84
Siemens
Building Technologies

12.5 Technical data KNX PL-Link

Transmission medium (bus cable)
Baud rate
Bus line polarity
Bus terminating resistor
The communication signal (information) is transferred symmetrically, i.e., as
voltage difference between the two bus lines (and not as a voltage difference to the
earthing potential). The sign preceding the voltage between PL+ and PL–
determines signal values 0 and 1.
Cable type
Wire diameter
Line resistance
Specific capacity
Specific inductivity
Screens
PXC3 devices do not have a connection for bus cable screens
Internal bus power from room automation station
PXC3... DC 30 V, 160 mA for max. 16 KNX devices with 10 mA each
DXR2... DC 30 V, 50 mA for max. 5 KNX devices with 10 mA each
If the consumption is more than 160 / 50 mA (more than 16 / 5 devices or more
than 10 mA per device), one or two external bus power supplies are required.
In this case the internal bus power supply must be disabled via tool, as parallel
operation of the internal supply with external supplies is not admissible.
64 devices in a KNX PL-Link network.
Desigo TRA Engineering, mounting and installation
KNX PL-Link room bus
TP (twisted pair)
9.6 kbps
(fixed for TP)
PL+, PL–
(not interchangeable)
Not required
2-wire, stranded (
one wire pair)
or 2x2-wire, stranded
or spiral quad
Min. 0.8 mm (AWG20)
Max. 1.0 mm (AWG18)
20 ... 75 /km
10 ...100 nF/km at 10 kHz
450 ...850 µH/km at 10 kHz
Not required
CM111043en_09
2016-02-22