Program description
FB-KE: 07
SRC KNX
Rev 1
SRC_KNX_620_BMA_E_2009_10_08_001.doc
Seite 9 von 14
Erstellt am 12.01.2010
Temperature controller, continuous
This controller sends value telegrams (type KNX: 5.001, EIB: EIS 6) as control values, e.g. for servo drives or fans for
controlling room temperature. For each current value received by the sensor, a new control value is calculated and
sent if necessary.
The input values of the controller can be handled by any KNX device with suitable communication objects. However,
the channel is optimised for operating with an EnOcean temperature sensor supported by the gateway. Output
objects of a sensor channel and the matching input objects of a control channel can be connected in the same device
via group addresses.
The send interval of the temperature sensor is usually adjustable via jumpers in the device. For the sensors tested
with the device, the best results were obtained with a send interval of max. 16 minutes. With this value, the sensors
were easily able to continue transmitting through the night if installed in a location that was not too dark during the
day. The installation location of the sensor is decisive for the effectiveness of the control and should be selected with
care and after sufficient testing.
The control value from the controller is calculated by the following method:
Control value change = 42 * (set value – current value)
Control value = old control value + control value change;
Example:
A temperature difference of 3 °C results in a control value change of ~50 % (without limitation).
Communication objects
The devices printed in italics are typical application examples.
Input objects:
Presence:
From a time switch;
presence detector or presence key of a supported room control unit. The
presence is switched on with an ON telegram and off with an OFF telegram or after a switch-off delay
Temperature:
From a temperature sensor;
current temperature value; used as the current value for the control
Set value adjustment:
From the set value adjustment of a supported room control unit;
used for set value
adjustment but also for specification of a basic set value.
Window:
From a window contact;
When an ON telegram is received via this communication object, the valves
switch off after a delay defined in the parameters and the control pauses. When an OFF telegram is received,
the delay is switched off and the control is activated.
Switch between heating/cooling:
From the central control unit;
If heating/cooling via a communication object
is set in the parameters settings, this communication object is visible. It can be used to change over the
operating mode of the channel. Heating is activated with an ON telegram and cooling with an OFF telegram.
Comm. object
KNX (EIB) type
Size
Channel … : Presence
1.001 (EIS 1)
1 bit
Channel … : Temperature
9.002 (EIS 5)
2 bytes
Channel … : Set value
adjustment
9.002 (EIS 5)
2 bytes
Channel … : Frost
1.001 (EIS 1)
1 bit
Channel… : Switch between
heating/cooling
1.001 (EIS 1)
1 bit
Output objects:
Heating on/off:
To a boiler or visualisation;
If the sent control value from the heating controller changes from
0 % to a value greater than 0 %, an ON telegram is sent via this communication object; an OFF telegram is sent
in the opposite case.
Cooling on/off:
To an air conditioner or visualisation;
If the sent control value from the cooling controller
changes from 0 % to a value greater than 0 %, an ON telegram is sent via this communication object; an OFF
telegram is sent in the opposite case.
Heating value:
To a drive;
control value from the heating controller
Cooling value:
To a fan or flap control;
control value from cooling controller
