Multifunctional Input - Siemens RDF300 Documentation

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Siemens
Building Technologies
4.9

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
0 Not used
1 External/Return air temp.
2 Heat/cool changeover
3 Operating mode switchover
4 Dewpoint monitor
5 Enable electrical heater
6 Alarm
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".
RDF300.../RDF340.../RDF400... Basic Documentation
4BFunctions
Description
No function.
Sensor input for external room
temperature sensor or return air
temperature sensor to measure the
current room temperature, or floor
heating temperature sensor to limit
the heating output.
Note: The room temperature is
measured by the built-in sensor if
the floor heating limitation function
is enabled via parameter P51.
Sensor input for automatic heating /
cooling changeover function.
A switch can also be connected
rather than a sensor (switch closed
= cooling, see section 4.5).
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.
Digital input for a dewpoint sensor
to detect condensation. Cooling is
stopped if condensation occurs.
Digital input to enable/disable the
electrical heater via remote control.
Digital input to signal an alarm. If
the input is active, "ALx"
displayed.
Note : Alarm displays do not influ-
ence controller operations. They
merely represent a visual signal.
Example: dirty air filter
Type
-
AI
AI/(DI)
DI
DI
DI
DI
is
(x:=1 or 2)
CE1P3076en
28 Aug 2008