Basic Documentation

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Siemens Wall-mounted sensors and room operator units for KNX/ETS and KNX/ACS CM2N1602en_07
Smart Infrastructure Functionality / Use 2020-06-20
4.4.2 Control and operation
Type
Control and operation
PID control temperature
Threshold value switc
h humidity
Threshold value switc
h CO
2
Operation of light, shading and scenes
Manu
al switching of ventilation
Room operating mode
Presence function
Only operation and display
Sensors
QMX3.P30 X X
QMX3.P40 X
QMX3.P70 X X X
Room
operator
units
QMX3.P02 X X X
QMX3.P34 X X X X X X X
QMX3.P44 X X X X X X X
QMX3.P74 X X X X X X X
QMX3.P37 X X X X X X X X
The room operator units can be connected via bus to suitable KNX heating,
ventilating, and air conditioning actuators via integrated control functions for room
temperature, humidity, and air quality.
A proven PID controller for heating and cooling is provided to control the room
temperature. The controller supplies a continuous or a pulse-width-modulated PID
signal for one heating and one cooling actuator. The room temperature setpoints
for the two operating modes heating and cooling as well as a blocking object can
be set using the touch keys and the display or received from the bus. Changeover
to the operating mode Heating/Cooling is automatic. Preset control parameters,
adjusted for the heating type or cooling type, are available for selection.
The integrated room humidity controller and room air quality controller can be
used for ventilation control. For both controllers, the setpoints can be adjusted
using touchkeys and display, or they can receive up to three switching point values
via the bus.
When the respective switching point is exceeded, up to three control signals and
one quasi-continuous signal to control the ventilation actuators are transmitted to
other bus members. In addition, a signal with the max. control value from both
Control functions
(KNX all types)