Siemens Desigo RXB Technical Manual page 42

Application
Use of spare
inputs/outputs
Note
Functions
2/16
Siemens
Building Technologies
The RXB21.1 and RXB22.1 room controllers are optimized for control of fan-coil
systems in individual rooms.
The following options are available with fan-coil systems:

RXB21.1: Single-speed to 3-speed automatic fan control

RXB22.1: Single-speed to 3-speed automatic fan control
with integrated relay for electric re-heater
The application of each controller is determined by the application software.
The controllers are delivered with a fixed set of applications, each of which contains
various individual applications. The relevant application is selected and activated during
commissioning using one of the following tools:

ETS3 Professional (EIB / KNX Tool Software)

Synco ACS

"HandyTool" (the QAX34.3 room unit includes a tool function allowing you
to parameterize the connected RXB controller).
Some of the applications do not make full use of all the inputs and outputs. These I/Os
can be used freely in conjunction with a building automation and control system to
register digital signals, for example, or to control various items of equipment (ON/OFF
or pulse control with AC 24 V or volt-free relay contacts).
The inputs can then be read and the outputs controlled via the building automation and
control system.
Not suitable for time-critical processes <1 s.
The room controller functions are determined by the selected application and its
parameters, and by the input/output configuration.
For details, refer to the FNC description of functions, document CA110385.
When DESIGO RXB controllers are integrated into a building automation and control
system, or into a Synco system, additional functions become available such as time
scheduling, central control of setpoints, etc.
RXB21.1, RXB22.1 Room controllers CM2N3873en_06
02 Apr 2010