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Siemens
Installation guide RXB, RXL
CM110381en_01
Building Technologies
Konnex bus technology
28 Feb 2009
4.2.3
Bus power supply
RXB and RXL controllers work without bus supply if the following conditions are
adhered to:
•
Parameterize only using the Handy Tool (not with ETS3 or ACS).
•
No integration in a building automation and control system (e.g. DESIGO,
Synco).
•
No changeover operation (sensor signal via bus).
•
No outside air temperature via bus.
•
No master/slave combinations.
When RXB and RXL controllers are operated In a network, the Konnex bus, used
by room controllers for communications, requires a bus supply.
Each controller consumes 5 mA. Thus, select the supply according to the number
of controllers.
We recommend the following products:
Manufacturer
Product No.
Designation
Siemens Building Technologies
ACX95.320/ALG
Power Supply 320 mA
Siemens Automation Technologies 5WG1 125-1AB01 Power Supply 160 mA
5WG1 125-1AB11 Power Supply 320 mA
5WG1 125-1AB21 Power Supply 640 mA
4.2.4
Bus line polarity
The Konnex bus is dependent on polarity.
CE+ normally red core
CE+ normally black core
Standalone operation,
commissioning offline
Operation in a network