Description Of Communication Objects - Siemens RDG100KN Basic Documentation

Obj Object name Function
1 System time Time and
date
System time for display on the room thermostat. See parameter
P07 (3 or 4)
3 Time of day Time and
date
Another object for receiving the time of day for display on the room
thermostat. See parameter P07 (3 or 4)
4 Fault information Alarm
Info
Common alarm output. If an alarm occurs, the alarm number is
transmitted
5 Fault state Faulty /
normal
Common alarm output. If an alarm occurs, the alarm flag is set
6 Fault Enable /
transmission disable
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 Auto
mode: Comfort
Preselection PreComf.
Economy
Protection
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 will transform Precomfort either into
Economy or Comfort (selectable via P88).
Operating mode: Trigger
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 Comfort
mode: Time Economy
switch PreComf.
Protection
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 has the highest priority and cannot be overridden.
Note: The thermostat will transform Precomfort either into
Economy or Comfort (selectable P88).
Time switch Trigger
13 Comfort
14 Economy
15 Protection
Switch the HVAC mode to either Comfort, Economy or Protection
mode.
Siemens
Building Technologies

3.12.2 Description of communication objects

Type/ length Flags
19.001 CWU
8 Byte
10.001 CWU
3 Byte
219.001 CT
6 Byte
1.005 CT
1 bit
1.003 CWU
1 bit
20.102 CWTU
1 Byte
1.017 CW
1 bit
20.102 CWU
1 Byte
1.017 CW
1 bit
RDG100KN Basic documentation
Functions
Obj Object name Function
16 Room operating Comfort
mode: State Economy
Protection
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
support Precomfort.
Room operating ON
mode: OFF
17 State Comfort
18 State Economy
19 State Protection
Corresponding communication object sends "True"
20 Window state Open
Closed
The thermostat is set to Economy mode if value "1" (open) is
received. It switches back to the previous mode when the value is
"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, X2, D1 (parameter P38, P40, P42).
Only one input source must be used, either local input X1/X2/D1 or
KNX bus.
21 Room Temp.
temperature value
The value of the room temperature measured via built-in or
external sensor is available via this communication object.
22 Room tempera- Temp.
ture: Comfort value
basic setpoint
If function "Temporary setpoint" is enabled via parameter P69, then
after an operating mode change, the setpoint adjustments made by
the user and via communication object 23 will be dismissed and
the thermostat will be reset to the Comfort basic setpoint.
Note: Setpoints that have been changed via the local HMI may be
overwritten during a system startup from a central master
controller, e.g.RMB795.
The Comfort basic setpoint is stored in EEPROM (see section
3.3.2).  The service life of the EEPROM depends on the number
of write cycles. Never write this communication object cyclically!
23 Room Temp.
temperature: value
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.
Note: The Comfort basic setpoint (object 22) will not be changed.
24 Current setpoint Temp.
value
Current setpoint, including shift, compensation, etc., used by the
thermostat for temperature control.
25 Heating output 0...100 %
primary
Indicates the position of the heating actuator of first stage.
E.g. 2-pipe with electric heater application: Output of heating coil.
26 Heating output 0...100%
secondary
Indicates the position of the heating actuator of the second stage.
E.g. 2-pipe with electric heater application: Output of the electric
heater.
Type/ length Flags
20.102 CRT
1 Byte
1.002 CT
1 bit
1.019 CWU
1 bit
9.001 CRT
2 Bytes
9.001 CWU
2 Bytes
9.001 CWTU
2 Bytes
9.001 CRT
2 Bytes
5.001 CRT
8 bit
5.001 CRT
8 bit
59 / 86
CE1P3191en
22 Jun 2010