KNX control elements and application parameters
Application "Internal RTC"
Product manual 2CKA001473B5342
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231
10.24.2 Heating control
Notice
Only available when the "Control function" parameter is set either on "Heating,"
"Heating with additional stage," "Heating and cooling" or "Heating and cooling
with additional stages".
10.24.3 Heating control - Control value type
Options:
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil unit
The actuation of the control valve is determined by the selection of the controller type.
–
2-Point 1 Bit, Off/On
: The 2-point control is the simplest type of control. The controller
switches on when the room temperature drops below a certain level (setpoint temperature
value minus hysteresis) and switches off when a particular value (setpoint temperature
value plus hysteresis) is exceeded. The switch-on and switch-off commands are sent as 1-
bit commands.
–
2-Point 1 Byte, 0/100%
: This is another two-point control as described above. In this case,
however, the switch-on and switch-off commands are transmitted as 1-byte values (0% /
100%).
–
PI continuous, 0-100%
: The PI controller adjusts its output value between 0% and 100% to
match the difference between the actual value and the setpoint value and enables a precise
regulation of the room temperature to the setpoint value. It sends the control value to the
bus as a 1-byte value (0% - 100%). To reduce the bus load, the control value is only
transmitted if it has changed by a predefined percentage in relation to the previous sent
value. In addition, the control value can be sent cyclically.
–
PI PWM, On/Off
: This also is a PI controller. The output is as a 1-bit command. For this, the
calculated control value is converted into a pulse-interval signal.
–
Fan coil unit
: The fan coil controller functions similar to the PI continuous controller. In
addition, it allows the separate control of the fan in the fan coil unit (e.g. fan speed levels 1 -
3).
Notice
The controller parameters "Type of heating" and "Basic-stage heating" are only
available in dependence of the selected parameters "Type of control value" and
"Extended settings".
10.24.4 Heating control — Heating type
Optionen:
PI continuous, 0 – 100% and PI PWM, On/Off:
■
Area (e.g. floor heating) 4°C 200 min
■
Convector (e.g. heater) 1.5°C 100 min
■
Free
configuration
