Description Of Communication Objects - Siemens KNX RDG400KN Basic Documentation
Room thermostats with communications
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Also See for KNX RDG400KN:
- Basic documentation (87 pages) ,
- Manual (14 pages) ,
- Operating instructions (2 pages)
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Obj
Object name
1
System time
System time for display on the thermostat (see P07 (3 or 4))
3
Time of day
Another object for receiving the time of day for display on the
thermostat (see P07 (3 or 4))
4
Fault information
Common alarm output. If an alarm occurs, the alarm number is
transmitted
5
Fault state
Common alarm output. If an alarm occurs, the alarm flag is set
6
Fault
transmission
A supervisor alarm system can disable the broadcasting of alarms
by the devices. This has no impact on the local display of alarms.
After a timeout of 48 hours, the sending of faults will automatically
be enabled again.
7
Room operating
mode:
Preselection
Controls the room operating mode selection of the thermostat via
bus.
The command can also be submitted as four 1-bit communication
objects (8...11). The last interaction wins – either from local
operating mode button or via bus.
Note: The thermostat changes Precomfort either into Economy or
Comfort (selectable via P88).
Operating mode:
Preselection
8
Auto
9
Comf
10
Eco
11
Prot
Switch room operating mode to either Auto, Comfort, Economy or
Protection.
The last interaction wins – either from the local operating mode
button or via bus.
12
Room operating
mode: Time
switch
This information is provided by a central time switch or a
supervisor and defines the actual HVAC operating mode.
The command can also be submitted via three 1-bit
communication objects (13...15).
Protection mode has the highest priority and cannot be overridden.
Note: The thermostat changes Precomfort either into Economy or
Comfort (selectable via P88).
Time switch
13
Comfort
14
Economy
15
Protection
Switch the HVAC mode to either Comfort, Economy or Protection.
16
Room operating
mode: State
62 / 86
Siemens
Smart Infrastructure
3.11.2 Description of communication objects
Function
Type/length
Time and
19.001
date
8 Byte
Time and
10.001
date
3 Byte
Alarm
219.001
Info
6 Byte
Faulty/
1.005
normal
1 bit
Enable/
1.003
disable
1 bit
Auto
20.102
Comfort
1 Byte
PreComf.
Economy
Protection
Trigger
1.017
1 bit
Comfort
20.102
Economy
1 Byte
PreComf.
Protection
Trigger
1.017
1 bit
Comfort
20.102
Economy
1 Byte
Protection
RDG400KN,RDG405KN Basic documentation
Flags
Obj
Object name
CWU
Effective room operating mode used by the thermostat
(considering time switch, user selection, window contact, etc.) This
state information is available via one 8-bit enumeration or three 1-
bit communication objects (17...19). Note: The thermostat does not
CWU
support Precomfort mode.
Room operating
mode:
17
State Comfort
CT
18
State Economy
19
State Protection
Corresponding communication object sends "True"
20
Window state
CT
The thermostat is set to Economy mode if value "1" (open) is
received. It switches back to the previous mode when the value is
CWU
"0" (closed).
"Window state" is sent e.g by a KNX switch or a KNX presence
detector. It has the same effect as the local operating mode
switchover contact X1, D1 (P38, P42).
Only one input source must be used, either local input X1-D1 or
the KNX bus.
CWTU
21
Room temperature
(RDG400KN)
The value of the room temperature acquired via built-in or external
sensor is available via this communication object.
22
Room tempera-
ture: Comfort
basic setpoint
If function "Temporary setpoint" is enabled via P69, then – after an
operating mode change – the setpoint adjustments made by the
user and via communication object 23 is dismissed and the
thermostat will be reset to the Comfort basic setpoint.
Note: Setpoints that have been changed via the local HMI may be
CW
overwritten during a system startup from a central master
controller, e.g.RMB795.
The Comfort basic setpoint is stored in EEPROM (see section
à
3.3.2).
The service life of the EEPROM depends on the number
of write cycles. Never write this communication object cyclically!
23
Room temperature:
Comfort setpoint
Communication object used to shift the setpoint used by the
thermostat (see section 3.3.2). Same priority as local setpoint shift
on the thermostat. The last intervention wins.
CWU
Note: The Comfort basic setpoint (object 22) will not be changed.
24
Room temperature:
Current setpoint
Current setpoint, including shift, compensation, etc., used by the
thermostat for temperature control
25
Control output
VAV
Indicates the position of the air damper. E.g. single-duct
26
Heating output
primary
CW
Indicates the position of the heating actuator of the electric
heating. E.g. single-duct with electric heater application: Output of
the electric heater.
CRT
27
Cooling output
primary
Function
Type/length
ON
1.002
OFF
1 bit
Open
1.019
Closed
1 bit
Temp.
9.001
value
2 Bytes
Temp.
9.001
value
2 Bytes
Temp.
9.001
value
2 Bytes
Temp.
9.001
value
2 Bytes
0...100%
5.001
1 Byte
0...100%
5.001
1 Byte
0...100%
5.001
1 Byte
CE1P3192en
2019-04-12
Flags
CT
CWU
CRT
CWU
CWTU
CRT
CRT
CRT
CRT
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