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Siemens RDU340… Basic Documentation CE1P3078en

Building Technologies Functions 2014-09-05

4.8 Multifunctional input

The controller offers two multifunctional inputs X1 and X2. A sensor of type NTC

like QAH11.1 (AI) or a switch (DI) can be connected to the input terminals. The

functionality of both inputs can be configured via parameters P38 for input X1 and

P40 for input X2.

# Function of input X1/X2 Description Type

0 Not used No function. -

1 External/Return air temp. Sensor input external room

temperature sensor or return air

temperature sensor to measure the

current room temperature.

2 Heat/cool changeover Sensor input for automatic

heating/cooling changeover

function. A switch can also be

connected rather than a sensor.

AI/(DI)

3 Operating mode switchover Digital input to switch over the

operating mode to Energy Saving.

If the operating mode switchover

contact is active, user operations

are ineffective and “OFF” is

displayed.

4 Dewpoint monitor Digital input for a dewpoint sensor

to detect condensation. Cooling is

stopped if condensation occurs.

5 Enable electrical heater Digital input to enable/disable the

electrical heater via remote control.

6 Alarm Digital input to signal an alarm.

If the input is active, “ALx” (x:=1 or 2)

is displayed.

Note: Alarm displays do not influ-

ence controller operations. They

merely represent a visual signal.

Example: No air flow or el. heater

overheated.

Operational action can be changed between normally open (N.O.) and normally

closed (N.C.) via parameter P39 or P41 if it is a digital input (DI).

Each function can only be assigned to input X1 or X2; only “Alarm” can be

assigned to both inputs.

X1 is factory-set to “Operating mode switchover” (3) and X2 to “Heating/cooling

changeover” (2).

For more information see section 4.4 “Applications”.

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