Cables - Siemens Desigo TRA Engineering, Mounting And Installation Manual

Bus lines
Bus cable selection
Recommended cable
types
Bus cable screening
Bus cable: KNX
specified.
Network with internal
power supply from the
room automation
station
Network with external
power supply
Polarity
60 / 84
Siemens
Building Technologies

12.3 Cables

The bus lines (= twisted pair) are connected via PL+ (red) and PL– (black).
+
-
Choose the bus cable as per country-specific offerings. Comply with values
indicated in this document under "Technical data KNX PL-Link".
AC24V for field supply can be provided in the same (2 x 2 stands) or in a separate
cable.
Recommended bus cable are available on the KNX homepage under Downloads /
Support – 06 KNX Certification – 02 KNX Certified Products – Cable:
http://www.knx.org/downloads-support/downloads/:
– 1 x 2 x 0.8 mm (e.g. Belden YE00819 or YE00905 - non-halogen).
– 2 x 2 x 0.8 mm (e.g. Belden YE00820 or YE00906 - non-halogen).
In TRA plants, bus cables without screen are permitted. The screens available for
bus cables do not need to be connected.
If interference is expected on the KNX bus, use a cable with screen. Connect the
screen as per standard installation rules.
The indications for distances and line lengths in a network are designed for bus
cables specified by KNX.
Comply with the following distances for a KNX network with the internal power
supply from the room automation station:
Distance between device and
internal supply
Distance between devices
Total length of all lines on one line
Comply with the following distances for a KNX network with external bus power
supply (PSU) (see section 12.1.2):
Distance PSU to PXC3 with switched off internal supply
Distance device to next PSU
Distance between two PSU operated in parallel
Min. 0 m for the new Siemens power supply modules recommended
in section 12.1.2.
Distance between devices
Total length of all lines on one line
Important: The bus conductors must NOT be inverted.
(KNX terminals + and –).
Desigo TRA Engineering, mounting and installation
KNX PL-Link room bus
+ AC 24 V
-
DXR2
max. 80 m / 260 ft
max. 80 m / 260 ft
max. 80 m / 260 ft
PXC3
Max. 350 m / 1150 ft
Max. 350 m / 1150 ft
Max. 350 m / 1150 ft
Min. 0 m
Max. 350 m / 1150 ft
Min. 200 m / 650 ft
Max. 700 m / 2300 ft
Max.1000 m / 3280 ft
CM111043en_09
2016-02-22