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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
FNC18 generates an additional energy demand signal for the heating surface:
Energy demand heating surface (Output)
Possible partner function blocks
Known partner devices
EnergyDemRD
Distr zone, heating
153 RHDTTU
Radiator Energy Demand
Transformer TU
Siemens:
Synco RMH760
RMU710 / 20 / 30
RMB795 / RMS705
The energy demand is independent of the changeover signal!
11.6 Heating/cooling signal output
The heating/cooling status display is mapped to a building automation and control
system via the following S-mode communication object (applies to States 1, 3, 20):
Effective application mode (Output communication object)
Flags
R W C T U
Type Send
heartbeat
States
1 0 1 1 0 20.105
DPT_HVACContrMode
yes
1 = Heat
3 = Cool
20 = No demand
11.7 Special functions
The special functions described in sections
ff are triggered by the following S-
mode communication object:
Application mode (Input communication object)
Flags
R W C T U
Type Receive
timeout
States
0 1 1 0 0 20.105
DPT_HVACContrMode
yes
0 = Auto
1 = Heat
2 = Morning Warmup
3 = Cool
4 = Night Purge
5 = Precool
6 = Off
7 = Test
*)
8 = Emergency Heat
9 = Fan Only
10 = Freecool
Other states not used
*) Exit from Test mode (7) is only possible with sequence Off (6) + normal mode (0).
The following communication object is used in LTE mode:
Application mode (Input)
Possible partner function blocks
Known partner devices
ContrMode
Timeswitch
zone
104 PMC
Programs to HVAC-Mode Conversion
109 BOS
Building/Occ-Mode Source
115 HVACOPT
HVAC Optimizer
Siemens:
Synco RMB795
Note
KNX
R
CO
KNX
R
CO