Multifunctional Input, Digital Input - Siemens RDF301 Basic Documentation
Semi-flush mount room thermostats with knx communications
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Also See for RDF301:
- Basic documentation (94 pages) ,
- Instructions manual (17 pages) ,
- Quick start manual (14 pages)
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K NX
R
#
0
1
2
K NX
R
Heating/
cooling
changeover
3
K NX
R
Window
state
4
5
K NX
R
Enable elec-
tric heater
Siemens
Building Technologies
3.9
Multifunctional input, digital input
The thermostat has 2 multifunctional inputs X1 and X2
An NTC type sensor like the QAH11.1 (AI, analog input) or a switch (DI, digital
input) can be connected to the input terminals. The functionality of the inputs can
be configured via parameters P38 + P39 for X1 and P40 + P41 for X2.
The current temperature or state of the inputs X1/X2 is available on bus for
monitoring purposes.
The parameters can be set to the following values:
Function of
Description
input
Not used
No function.
External / return
Sensor input for external room temperature sensor or
air temperature
return air temperature sensor to acquire the current
room temperature, or floor heating temperature sensor
to limit the heating output.
Note: The room temperature is acquired by the built-in
sensor if the floor temperature limitation function is
enabled via parameter P51.
Heating / cooling
Sensor input for "Automatic heating / cooling
changeover
changeover" function.
A switch can also be connected rather than a sensor
(switch closed = cooling, see section 3.5).
Heating / cooling changeover is also possible via bus.
In this case, the function must not be assigned to any
local input X1, X2. See also section 3.5.
Diagnostic value 0 ˚C is displayed for closed contact /
100 ˚C for open contact, if a switch is connected.
Operating mode
Digital input to switch over the operating mode to
switchover
Economy.
If the operating mode switchover contact is active, user
operations are ineffective and "OFF" is displayed.
Operating mode switchover is also possible via bus. In
this case, the function must not be assigned to any local
input X1, X2. See also section 3.2.
Dew point
Digital input for a dew point sensor to detect
monitor
condensation. Cooling is stopped if condensation
occurs.
Enable electric
Digital input to enable / disable the electric heater via
heater
remote control.
Enable electric heater is also possible via bus. In this
case, the function must not be assigned to any local
input X1, X2. See also section 3.6.
RDF301, RDF301.50 Basic documentation
Functions
Type
X1/X2
--
AI
AI /
DI
DI
DI
DI
43 / 80
CE1P3171en
22 Jun 2010
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