K N X
Reducing the bus load
HandyTool See parameters in the last column of the following table.
Heating outp bus el heating
Central disable signal
K N X
The electric reheater
In the case of the RXB22.1 room controller, the electric reheater is switched directly via
output Q44 (max. 1.8 kW resistive).
The controller output of the electric reheater can be disabled locally via a safety
thermostat connected to one of the hardware inputs. The alarm input and the way in
which it operates can be configured with the tool (see "Digital inputs", page 126).
When the safety thermostat trips, an alarm is generated, which is output via the
communication object Alarm (see page 134).
The "position" of the electric reheater is also mapped to the bus.
In S-mode, the following communication object is used for this purpose:
Heating output bus electric heating (Output communication object)
R W K T U
1 0 1 1 0 5.001
In LTE mode, the "position" of the electric reheater is transmitted as follows:
Heating output bus electric heating (Output)
If the LTE bus information is not required, it can be disabled (see pages 90 and 143 for
notes on reducing the load on the bus).
0 = Disabled / Off
1 = Enabled / On
In applications involving an electric reheater, the latter can be disabled (e.g. for reasons
associated with tariff regulations).
The communication objects are as follows:
Enable electric heating (Input communication object)
R W K T U
0 1 1 0 0 1.003
RXB (KNX) application library
Possible partner function blocks
HVAC Valve Actuator
Electric Heater Element Actuator
FNC Description of functions for FC-10, FC-11, FC-12
255 = 100%
0 = Disabled
1 = Enabled
0 = 0%
28 Feb 2009