Data Sheet for Product

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Siemens RDF880KN… A6V11282546_en--_e
Smart Infrastructure Touch Screen Flush-mount Room Thermostats with KNX Communications 2021-02-26
KNX S-Mode communication object
Obj.
Object Name
Function
Type
Length
CRWTU
Descriptions / Selections:
visibility depends on DIP switch setting
4
Fault information
alarm info
219.001
6 bytes
CT
CONTROL: all DIP switch Settings
It is a command to send out common alarm output in alarm numbers/codes.
5
Fault state
faulty/normal
1.005
1 bit
CT
CONTROL: all DIP switch Settings
It is a command to set the alarm flag if an alarm occurs.
6
Fault transmission
enable/disable
1.003
1 bit
CWU
STATUS: all DIP switch Settings
A value (enable or disable) is received from a supervisory alarm system to enable
or disable the broadcasting of alarms by the devices. This has no impact on the
local display of alarms. The sending of faults/alarms will be enabled automatically
after time out (48 hours).
7
Room operating mode:
Preselection
HVAC mode
20.102
1 byte
CWTU
CONTROL/STATUS: use for DIP switch Setting → 1: UFH, 3: BOTH
To change or to receive the room operating mode selection via the bus.
Note: The thermostat will switch from Precomfort to Economy or Comfort mode
(selectable via P88).
8
Room operating mode:
Preselection Auto
switch
1.001
1 bit
CW
STATUS: use for DIP switch Setting → 1: UFH, 3: BOTH
The value is received to switch the room operating mode to Auto, Comfort,
Economy or Protection.
9
Room operating mode:
Preselection Comfort
switch
1.001
1 bit
CW
10
Room operating mode:
Preselection Economy
switch
1.001
1 bit
CW
11
Room operating mode:
Preselection Protection
switch
1.001
1 bit
CW
12
Room operating mode:
Time switch
HVAC mode
20.102
1 byte
CWU
STATUS: use for DIP switch Setting → 1: UFH, 2: VRF
A time schedule defining the required operating modes is provided by a central
time switch or a supervisor.
Protection mode has the highest priority and cannot be overridden. (also refer to
P88 - Precomfort → Economy or Comfort)
13
Room operating mode:
Time switch Comfort
switch
1.001
1 bit
CW
STATUS: use for DIP switch Setting → 1: UFH, 2: VRF
The value is received to switch the room operating mode to Auto, Comfort,
Economy or Protection according to a time schedule provided by a central time
switch or a supervisor.
14
Room operating mode:
Time switch Economy
switch
1.001
1 bit
CW
15
Room operating mode:
Time switch Protection
switch
1.001
1 bit
CW
16
Room operating mode:
State
Comfort
Economy
Protection
20.102
1 byte
CRT
CONTROL: use for DIP switch Setting → 1: UFH, 3: BOTH
It is a command to set the operating mode to Comfort, Economy or Protection
depending on user selection, window contact, etc.
17
Room operating mode:
State Comfort
switch
1.001
1 bit
CT
CONTROL: use for DIP switch Setting → 1: UFH, 3: BOTH
it is a command to switch the room operating mode to Comfort, Economy or
Protection.
18
Room operating mode:
State Economy
switch
1.001
1 bit
CT
19
Room operating mode:
State Protection
switch
1.001
1 bit
CT
20
Room operating mode:
Window state
open/close
1.019
1 bit
CWU
STATUS: all DIP switch Settings
A value “1” (open) is received to set operating mode to Protection (UFH) or Off
(VRF) i.e. UFH to Protection, VRF to Off.
A value “0” (close) is received to switch back to the previous operating mode
"Window state" is received from a KNX control device or via the local window
contact X1, X2 (P38, P40).
Note: Only one input source must be used, either local input X1/X2 or KNX bus.
21
Room temperature
temperature
value (°C)
9.001
2 bytes
CRT
CONTROL: all DIP switch Settings
It is a command to send out the current room temperature measured using built-
in or external sensor (via X1 or X2).
22
Room temp: Comfort
basic setpoint
temperature
value (°C)
9.001
2 bytes
CWU
STATUS: all DIP switch Settings
If temporary setpoint function is enabled (P69=ON), after any operating mode
changes, the setpoint will be reset to the Comfort basic setpoint.
Note: User setpoint via the local HMI may be overwritten during a system startup
from a central control unit, e.g.RMB795B.
23
Room temp: Comfort
setpoint
temperature
value (°C)
9.001
2 bytes
CWTU
CONTROL/STATUS: all DIP switch Settings
Communication object is used to shift the setpoint for the thermostat. Same
priority as local setpoint shift on the thermostat.
Note: The Comfort basic setpoint (object 22) is not changed.
24
Room temp: Current
setpoint
temperature
value (°C)
9.001
2 bytes
CRT
CONTROL: all DIP switch Settings
It is the command to send out for the current setpoint under current operating
mode, including shift, compensation, etc., used by the thermostat for room
temperature control.
25
Heating output
primary
percentage
(0..100%)
5.001
1 byte
CRT
CONTROL: use for DIP switch Setting → 1: UFH, 3: BOTH
It is a command to send out to indicate the current position of the heating
actuator when UFH is active.
31
VRF Operating Mode:
State
HVAC
control mode
20.105
1 byte
CWU
STATUS: all DIP switch Settings
The value of the VRF operating mode is set by a KNX control device.
0 - Auto; 1 - Heat; 3 - Cool; 9 - Fan; 14 - Dehumidify
33
*)
Fan operation
switch
1.001
1 bit
CRWTU
CONTROL/STATUS: use for DIP switch Setting → 2: VRF
It is a command to set the current fan mode to the VRF: Auto (0); Manual (1).