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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12 CM110385en_05
Building Technologies
General and central functions
28 Feb 2009
11.5 Heating and cooling demand
To provide the required heating or cooling energy, the heating and/or cooling demand
from each room is transmitted to the building automation and control system.
Refer to the application example in section
for more detailed information on
heating/cooling demand.
In the case of changeover applications the
real demand
is transmitted, independent
from the state of the changeover input (therefore it might be that a controller demands
heat, if c/o = cooling and room temp < SpH).
With ETS3 Professional, this function can be disabled in the room controller.
This parameter is not supported.
HandyTool
See parameters in the last column of the table below
Parameter
Description
HandyTool
Heating demand signal
Heating demand transmitted to the BAC system.
*131
Cooling demand signal
Cooling demand transmitted to the BAC system.
*132
Parameter Range
Basic
setting
*131, *132
0 = disabled, 1 = enabled
1 = enabled
The heating or cooling demand can be evaluated via the following S-mode
communication object.
Energy demand room (Output communication object)
Flags
R W C T U
Type Send
heartbeat Value
1 0 1 1 0 6.001
DPT_Percent_V8
yes
–100...100% : (-128 ... +127)
–100% = Full heat
+100% = Full cool
In LTE mode the energy demand is determined by two signals:
Heating coil energy demand (Output)
Possible partner function blocks
Known partner devices
EnergyDemAH
Distr. zone, heating
154 AHDTTU
Air Heater Energy Demand
Transformer TU
Siemens:
Synco RMH760
RMU710 / 20 / 30
RMB795 / RMS705
Cooling coil energy demand (Output)
Possible partner function blocks
Known partner devices
EnergyDemAC
Distr.zone, cooling
217 ACDTTU
Air Cooler Energy Demand
Transformer TU
Siemens:
Synco RMU710 / 20 / 30
RMB795 / RMS705
Note
ETS3
Professional
ACS
Service
KNX
R
CO