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Siemens
RXB (KNX) application library
FNC Description of functions for FC-10, FC-11, FC-12
CM110385en_05
Building Technologies
Setpoint calculation
28 Feb 2009
HandyTool
See Parameters in the last column of the table below
Name
Basic setting
Range 1)
Resolution
Parameter
Protection
cooling setpoint
40 °C
10 ... 40 °C
0.5 K
*030
Economy
cooling setpoint
35 °C
10 ... 40 °C
0.5 K
*031
Precomfort
cooling setpoint
28 °C
10 ... 40 °C
0.5 K
*032
Comfort
cooling setpoint
24 °C
10 ... 40 °C
0.5 K
*033
Comfort
heating setpoint
21 °C
10 ... 40 °C
0.5 K
*034
Precomfort
heating setpoint
19 °C
10 ... 40 °C
0.5 K
*035
Economy
heating setpoint
15 °C
10 ... 40 °C
0.5 K
*036
Protection
heating setpoint
12 °C
10 ... 40 °C
0.5 K
*037
Frost protection
limit value *)
5 °C
2 ... 10 °C *)
0.5 K
*040
1) ACS checks the values / ranges for intersection.
There is no check in ETS and HandyTool.
2) The
Frost protection
limit can only be changed in applications with an outside air
damper. In the other applications it is fixed at 5°C.
HandyTool: If setpoints are irrelevant for the application (e.g. heating setpoints for
chilled ceiling), they are hidden, and they are set equal to the Protection setpoints
internally.
For reasons of symmetry, all communication objects are always available.
6.3
Setpoint adjustment runtime
The setpoints are stored in the EEPROM so that they are retained when the controller
is reset. If a value different from a previous value is received on the communication
objects
setpoints for heating
and
setpoints for cooling
, a write process is triggered
in the EEPROM.
Æ
The service life of the EEPROM depends on the number of Write cycles.
Separate heating and cooling setpoints for
Comfort, Precomfort
and
Economy
may also
be defined
via the bus, either
individually
or
as triplets
.
Economy cooling setpoint (Input communication object)
Precomfort cooling setpoint (Input communication object)
Comfort heating setpoint (Input communication object)
Comfort cooling setpoint (Input communication object)
Precomfort heating setpoint (Input communication object)
Economy heating setpoint (Input communication object)
Flags
R W C T U
Type Receive
timeout
States
0 1 1 0 0 9.001
DPT_Value_Temp
no
Floating point (°C)
Setpoints heating (Input communication object)
Setpoints cooling (Input communication object)
Flags
R W C T U
Type Receive
timeout
States
0 1 1 0 0 222.100
DPT_TempRoomSetp
SetF16[3]
no
3 floating point values
- Comfort (°C)
- Precomfort (°C)
- Economy
(°C)
Setpoints
STOP
Note!
EEPROM service
life
KNX
R
CO
