Data Sheet for Product

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Building Technologies Data sheet KNX bus CE1N3127en
HVAC Products 18.02.2008
The network address is composed of the area, line, and device address (A.L.D) even if
no area and line couplers are used.
The network address reflects the bus device's unique position in a KNX network and is
unique within the related network.
Area and line coupler addressing must already be laid out during planning in accord-
ance with the network structure. See document P3127 for more information on
addressing.
Up to 64 bus devices can be installed on one line (also area line 0 and main lines
1…15). No restrictions apply to mixing Synco and third-party devices.
Synco 700 extension modules RMZ78x and operator units RMZ790, RMZ791 as well
as room units at room controllers RXB/RXL (connected via PPS2) have no KNX
interface and thus need not be counted as bus devices.
Each bus device has a specific bus loading number E, considered the measure for
average data traffic on the bus caused by the device.
On a line with 64 Synco devices, the E-number need not be calculated (the total
of 300 E-numbers is not reached).
The bus loading numbers E are listed in the bus devices data sheets.
A bus power supply is required for bus communications. We differentiate between
"decentral (distributed) bus power supply unit DPSU" and "central bus power supply
unit PSU" (PSU = power supply unit).
Synco 700 control devices supply power to the bus. In this case, a network line may
contain max. eight supplying control devices.
A power supply unit supplies power to the bus. In this case, a network line may contain
max. two power supply units.
See document P3127 for more information on bus supplies DPSU and PSU.
Power supply units are used to establish a "central bus power supply". Commercially
available power supply units feature power outputs of 160, 320 and 640 mA.
DC 29 V voltage for the bus supply requires a voltage source with choke
. The DC 24 V
auxiliary voltage for the Siemens IP router requires a voltage source without choke
.
Calculate the power consumption of the bus devices (from KNX bus) to determine the
PSU for the bus power supply.
Depending on the bus topology and the number of bus devices (per line), several
power supply units featuring different power outputs may be necessary in a KNX
network.
See document P3127 for more information on power consumption of the bus devices
from the KNX bus.
Addressing
Network address
64 bus devices
on one line
Note
Bus loading number E
Bus power supply
Decentral bus
power supply DPSU
Central
bus supply PSU
Power supply unit
PSU
Notes