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Siemens RDG100KN Basic documentation CE1P3191en

Building Technologies Functions 22 Jun 2010

3.9 Multifunctional input, digital input

The thermostat has 2 multifunctional inputs X1 and X2 and a digital input D1.

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, P40 + P41 for X2, and P42 + P43

for D1.

The current temperature or state of the inputs X1/X2 and D1 is available on bus for

monitoring purposes.

The parameters can be set to the following values:

# Function of

input

Description Type

X1/X2

Type

0 Not used No function. -- --

1 External / return

air temperature

Sensor input for external room temperature sensor or

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.

AI --

KNX

Heating/

cooling

changeover

2 Heating / cooling

changeover

Sensor input for “Automatic heating / cooling

changeover” function.

A switch can also be connected rather than a sensor

(switch closed = cooling, see section 3.5).

Heatin

g / cooling changeover is also possible via bus.

In this case, the function must not be assigned to any

local input X1, X2, D1. See also section 3.5.

Diag

nostic value 0 ˚C is displayed for closed contact /

100 ˚C for open contact, if a switch is connected.

AI /

KNX

Window

state

3 Operating mode

switchover

Digital input to switch over the operating mode to

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, D1. See also section 3.2.

DI DI

4 Dew point

monitor

Digital input for a dew point sensor to detect

condensation. Cooling is stopped if condensation

occurs.

DI DI

KNX

Enable elec-

tric heater

5 Enable electric

heater

Digital input to enable / disable the electric heater via

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, D1. See also section 3.6.

DI DI

KNX

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