KNX Technical Reference Manual
ABB-i-Bus
®
-KNX Millenium
Description of applications /
objects
KNX Technical Reference Manual | 1473-1-8681
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11.3.5
General - Send cyclic "In operation" (min)
Options:
Setting option between 5 - 3000 minutes
– The "In operation" communication object serves to inform that the controller still operates.
Value "1" is sent cyclic. This parameter is used to set the cycle for sending. If the cyclic
telegram fails, the function of the device is faulty and the air-conditioning of the room can be
maintained with a forced operation. However, for this the system and/or actuator must have
"Forced operation" function.
Note
This parameter is only available if the "Additional function" parameter is set to
"Yes".
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11.3.6
Heating control
Note
Only available when the "Device function" parameter is set on either "Single
device" or "Master device" and the control function parameter is set on either
"Heating", "Heating with additional stage", "Heating and cooling" or "Heating and
cooling with additional stages".
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11.3.7
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
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).
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