The Electric Reheater - Siemens Desigo RXB Technical Manual

Technical manual
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Controller output
Safety thermostat
Desired output
K N X
CO
R
Reducing the bus load
HandyTool See parameters in the last column of the following table.
Short name
Heating outp bus el heating
Central disable signal
K N X
CO
R
Siemens
Building Technologies
8.4.3

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)
Flags
Type
R W K T U
1 0 1 1 0 5.001
DPT_scaling
In LTE mode, the "position" of the electric reheater is transmitted as follows:
Heating output bus electric heating (Output)
ActPosSetpHeatStageB
Geographical zone
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).
Range
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)
Flags
Type
R W K T U
0 1 1 0 0 1.003
DPT_Enable
RXB (KNX) application library
Control sequences
Send heartbeat
yes
Possible partner function blocks
352 HVA
HVAC Valve Actuator
369 EHEA
Electric Heater Element Actuator
Receive timeout
yes
FNC Description of functions for FC-10, FC-11, FC-12
Value
0...100%
255 = 100%
Known partner
devices
---
Basic setting
HandyTool
Disabled(0)
*089
Value
0 = Disabled
1 = Enabled
CM110385en_05
0 = 0%
97/166
28 Feb 2009

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