Table of Contents
Advertisement
KNX Technical Reference Manual
®
ABB-i-Bus
-KNX Millenium
Pos: 31.7.26 /DinA-4 -- Online/Applikations- / Parameterbeschreibungen -- (KNX)/Applikation/Objekt-RTR/ModuleRegelung Zusatzstufe Heizen — Art der Stellgröße @ 40\mod_1421680743735_15.docx @ 312708 @ 3 @ 1
11.3.22
Control of additional heating stage - Control value type
Options:
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 transmitted
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. The control value can also be transmitted cyclically.
–
PI PWM, On/Off: This also is a PI controller. Here, the output is a 1-bit command. For this to
occur, the calculated control value is converted into a pulse-interval signal.
–
Fan coil: The fan coil controller operates like the PI continuous controller. In addition, it
allows the separate activation of the fan in the fan coil unit (e.g. fan speed levels 1 - 3).
Pos: 31.7.27 /Systemmodule/++++++++++++++ Seitenumbruch +++++++++++++++ @ 41\mod_1422789416992_0.docx @ 333487 @ @ 1
KNX Technical Reference Manual | 1473-1-8681
Description of applications /
2-point 1 bit, Off/On
2-point 1 byte, (0/100%)
PI continuous, 0-100%
PI PWM, On/Off
Fan coil
objects
— 38 —
Advertisement
Table of Contents
