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Siemens
Wall-mounted sensors and room operator units for KNX/ETS and KNX/ACS
CM2N1602en_05
Building Technologies
ETS engineering
2018-09-14
5.3 Communication objects
The number and type of available objects as well as adjustable parameters can
vary depending on basic configuration. For detailed documentation on KNX data
point types, see [5].
Obj. Object name
Function
Type / Length Flags
Q
MX3
.P3
0
Q
MX3
.P4
0
Q
MX3
.P7
0
Q
MX3
.P3
4
Q
MX3
.P7
4
Q
MX3
.P0
2
Q
MX3
.P3
7
Room temperature sensor
1 Room Temperature [°C]
Temperature value in °C
9.001
2 bytes
CRT
X
X
X
X
X
X
X
Room temperature controller
2 Room temp. controller operating mode
HVAC control type (0 = Auto,
1 = Heating, 3 = Cooling, 6 = Off)
20.105
1byte
CRWU
X
X
X
X
X
X
X
3 Enable room temperature controller
Controller on = 1 / off = 0
1.003
1 bit
CRWU
X
X
X
X
X
X
X
4 Room temperature setpoint while cooling
Cooling temp. setpoint in °C
9.001
2 bytes
CRWU
X
X
X
X
X
X
X
5 Room temperature setpoint while heating
Heating temp. setpoint in °C
9.001
2 bytes
CRWU
X
X
X
X
X
X
X
6 Control value cooling - cont
(0..100%)
5.001
1 byte
CRT
X
X
X
X
X
X
X
7 Control value heating - cont
(0..100%)
5.001
1 byte
CRT
X
X
X
X
X
X
X
8 Control value cooling - on/off
On/Off
1.001
1 bit
CRT
X
X
X
X
X
X
X
9 Control value heating - on/off
On/Off
1.001
1 bit
CRT
X
X
X
X
X
X
X
The parameters Heating/cooling type adapt the controller to the heating type.
In addition, the controller knows two control algorithms, one for modulating mode (0..100%)
and one for PWM mode (on/off). The parameter "Positioning signal type" selects the mode. The
positioning signal type is the same for all operating mode.
In modulating mode (Obj. 6, 7), for a modulating positioning signal ≠ 0, the applicable,
associated PWM output is "on".
Devices
Provides the room temperature value from the integrated sensor.
Value of the outside temperature sensor: See object 53.
Must be placed in a group address to display the value on the display.
In the operating mode "Auto", the controller independently changes over between heating and cooling mode.
But only either the cooling or heating mode is always active.
If the object room temperature controller is enabled, the operating mode can changeover between "Off” (Obj. 3 = 0) and
"Auto” (Obj. 3 = 1). The standard operating mode is "Auto”.
The operating mode switches to "Auto" if the room temperature controller is enabled (1 = Controller on).
The operating mode switches to "Off" when switching off (0 = Controller off). The default value is controller on = 1.
The setpoints for cooling and heating mode do not lock out each other. In operating mode "Auto”, for
cooling setpoint < heating setpoint, the heating mode is nevertheless active.
The controller's comfort setpoints can be adjusted over the bus using these objects.
As long as no other values are received by the bus or adjusted on the device with display, the received setpoints of objects
4 and 5 apply.
Objects 4 and 5 act directly on the internal controller. The display on the device does not change!
In other words, you can adjust the active cooling setpoint as desired using object 4 (without limiting by the heating
setpoint) without this being visible on the display. The display for setpoint and operating mode remain unchanged. Object
4 is once again overwritten if something is adjusted on the device (setpoint and operating mode).
In other words, you can influence the controller for short periods using both objects.
In PWM mode (Obj. 8, 9 as well as Obj. 6, 7), the cycle time and pulse length is adapted to the
type of heating, the setpoint, and the measured room temperature. The minimum cycle is 12
minutes; the minimum pulse length 4 minutes. The modulating positioning signal outputs
values 0% or 100% in this operating mode.
