
Application Examples
System overview
18/5
Siemens ET G1 · 10/2008
System data
Bus cable
• Cable type mm
2
YCYM 2 x 2 x 0.8
One core pair (red, black) for signal transmission and power supply,
One core pair (yellow, white) for additional applications (SELV or voice)
Cable length
• Cable lengths of one line in total (core diameter: 0.8 mm) m Max. 1000 (including all junctions)
• Length between two bus devices m Max. 700
• Length between bus device and
power supply unit (320 mA)/reactor
m Max. 350
• Length between power supply unit (320 mA) and reactor Side-by-side mounting necessary
(on standard mounting rail with integrated data rail)
Bus devices
• Number of areas Max. 15
• Number of lines per area Max. 15
• Number of bus devices per line Max. 64
Topology Line, star or tree structure
Power supply
• Power supply V DC 24 (SELV safety extra-low voltage)
• Power supply units per line One power supply unit (160, 320 or 640 mA)
• Power supply units per line for high current demand Max. two power supply units at a distance of at least 200 m
Transmission
• Transmission technology Distributed, event-controlled, serial, symmetric
•Baud rate bit/s 9600
Device features (unless otherwise specified)
Degree of protection according to EN 60529 IP 20
Protective measure Bus: safety extra-low voltage SELV 24 V DC
Overvoltage category III
Rated insulation voltage U
i
V 250
Degree of pollution 2
EMC requirements Complies with EN 50081-1 and prEN 50082-2 (severity 3),
prEN 50090-2-2, KNX/EIB manual
Resistance to climate prEN 50090-2-2, KNX/EIB manual
Operating conditions
• Application For fixed installation indoors, for dry rooms and
installation in heavy-current distribution boards
• Ambient operating temperature °C -5 to +45
• Humidity in operation % Max. 93
• Storage temperature °C -40 to +55
• Humidity in storage % Max. 93
Certification KNX/EIB certified
CE marking Compliant with EMC Directive (residential and non-residential buildings),
Low Voltage Directive
ET_G1_2009_en.book Seite 5 Freitag, 28. November 2008 9:50 09
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