Technical data

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Siemens RDG400KN Basic documentation CE1P3192en
Building Technologies Functions 20 Jul 2010
Obj Object name Function Type/ length Flags
27 Cooling output
primary
0…100% 5.001
8 bit
CRT
Indicates the position of the cooling actuator of the first stage.
E.g. single duct with h/c coil application: Output of the cooling coil
28 Enable electric
heater
Enable /
disable
1.003
1 bit
CWU
An electric heater can be disabled with this communication object
(e.g. to meet tariff regulations).
The same function is also available via local multifunctional input
X1/ D1 (parameter P38, P42).
Only one input source must be used, either local input X1 /D1or
KNX bus.
29 Heating / cooling
changeover
Heat /
Cool
1.100
1 bit
CWU
Changeover information transmitted via bus. Only available with
application "Single duct with heating / cooling coil".
Default: Current mode before power down.
The same function is also available via local multifunctional input
X1/ D1 (parameter P38, P42).
Only one input source must be used, either local input X1/X2/D1or
KNX bus.
30 Supply air
temperature
Tem p .
value
9.001
2 Byte
CWU
The supply air temperature sent by the supply air controller
indicates whether cold or hot air is supplied (for VAV changeover).
The controller determines the necessity to open or close the air
damper according to the supply air temperature, the room tempe-
rature setpoint, and the current room temperature.
The same function is also available via local multifunctional input
X1/ D1 (parameter P38, P42).
Only one input source must be used, either local input X1/X2/D1or
KNX bus.
Obj Object name Function Type/ length Flags
31 Application mode HVAC
control
mode
20.105
8 bit
CWU
0 Auto (default) Heating and/or cooling
1 Heat Heating only
2 Morning warmup* Heating only
3 Cool Cooling only
4 Night purge Open damper fully
5 Precool* Cooling only
6 OFF Neither heating nor cooling
8 Emergency heat* Heating only
9 Fan only Open damper fully (= night purge)
* Function handled like Heat (1) or Cool (3)
32 X1: Temperature Te m p .
value
9.001
2 Byte
CRT
Indicates the values of the temperature sensors connected to the
local inputs X1 / X2
33
37
X1: Digital
D1: Digital
ON
OFF
1.001
1 bit
CRT
Indicate the status of the digital inputs (adjusted by parameters
P39 /P43) including considering of operating action
36 U1: 0..10V 0…100% 5.001
8 bit
CRT
Voltage DC 0…10 V at input U1 is indicated as a value 0…100%
38 Outside
temperature
Tem p .
value
9.001
2 Byte
CWU
The outside temperature measured by a KNX sensor can be
displayed on the thermostat, if parameter P07 "Additional user
information” is set = 2 (outside temperature).