Bus Power Supply; Bus Line Polarity - Siemens Desigo RXB Technical Manual

Standalone operation,
commissioning offline
Operation in a network
14 / 22
Siemens
Building Technologies
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
Siemens Building Technologies
Siemens Automation Technologies
4.2.4

Bus line polarity

The Konnex bus is dependent on polarity.
CE+ normally red core
CE+ normally black core
Installation guide RXB, RXL
Konnex bus technology
Product No. Designation
ACX95.320/ALG Power Supply 320 mA
5WG1 125-1AB01 Power Supply 160 mA
5WG1 125-1AB11 Power Supply 320 mA
5WG1 125-1AB21 Power Supply 640 mA
CM110381en_01
28 Feb 2009