Heating/Cooling Signal Output; Special Functions - Siemens Desigo RXB Technical Manual

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Siemens
Building Technologies
FNC18 generates an additional energy demand signal for the heating surface:
Energy demand heating surface (Output)
Possible partner function blocks
EnergyDemRD
153 RHDTTU
Radiator Energy Demand
Distr zone, heating
Transformer TU
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 Type
R W C T U
1 0 1 1 0 20.105
DPT_HVACContrMode
11.7

Special functions

The special functions described in sections 11.8 ff are triggered by the following S-
mode communication object:
Application mode (Input communication object)
Flags Type
R W C T U
0 1 1 0 0 20.105
DPT_HVACContrMode
*) 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
104 PMC
ContrMode
Programs to HVAC-Mode Conversion
Timeswitch
109 BOS
zone
Building/Occ-Mode Source
115 HVACOPT
HVAC Optimizer
RXB (KNX) application library
General and central functions
Send heartbeat States
yes
Receive timeout
yes
FNC Description of functions for FC-10, FC-11, FC-12
Known partner devices
Siemens:
Synco RMH760
RMU710 / 20 / 30
RMB795 / RMS705
1 = Heat
3 = Cool
20 = No demand
States
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
Known partner devices
Siemens:
Synco RMB795
CM110385en_05
28 Feb 2009