ABB i-bus FCC/S 1 1 Series Product Manual page 182

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ABB i-bus KNX
Parameters
The differences between the individual controller types are explained in the following:
• 2-point 1 bit (On/Off): 2-point control is the simplest form of control. The controller switches on if
the room temperature has dropped below a specific level (temperature setpoint minus hystere-
sis) and off as soon as a specific value (temperature setpoint plus hysteresis) is exceeded. The
switch-on and switch-off commands are sent as 1-bit commands.
The dependent Status Control value Additional-stage heating group object is enabled as a 1-bit
group object.
• 2-point 1 byte (0/100 %): This is also two-point control as above. The difference is that switch-
on and switch-off commands are sent as 1-byte values (0 %/100 %).
The dependent Status Control value Additional-stage heating group object is enabled as a 1-
byte group object.
• PI continuous (0...100 %): The PI controller adjusts its output value, between 0 % and 100 %,
to the difference between the actual value and setpoint and permits exact regulation of the
room temperature to the setpoint. It outputs the control value on the bus as a 1-byte value
(0...100 %). To reduce the bus load, the control value is only sent if it has changed by a previ-
ously specified percentage in relation to the value sent last. In addition, the control value can be
sent cyclically.
The dependent Status Control value Additional-stage heating group object is enabled as a 1-
byte group object.
• PI PWM (On/Off): This is also a PI controller. The output is as a 1-bit command. For this pur-
pose the control value calculated is implemented using a pulse-pause ratio.
The dependent Status Control value Additional-stage heating group object is enabled as a 1-bit
group object.
• PI continuous (0...100 %) for Fan Coil: The fan coil controller operates like the PI continuous
controller. In addition, the fan output is also actuated in the automatic mode corresponding to
the control value for the basic-stage heating.
The dependent Status Control value Additional-stage heating group object is enabled as a 1-
byte group object.
For a detailed description of the individual controller types, see Explanation of controller function,
Page 365.
7.5.1.7.1.1 2-point 1 bit (On/Off), 2-point 1 byte (0/100%)
The following parameters are enabled if the 2-point 1 bit (On/Off) or 2-point 1 byte (0/100%) option
has been selected in the Additional-stage heating control value type parameter.
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7.5.1.7.1.1.1 Dependent Parameter
Temperature difference from basic-stage heating
Options:
The temperature difference from basic-stage heating specifies the value from which or up to which
the additional-stage heating is to be active. If the actual temperature is below the setpoint tempera-
ture by the value selected here, the additional stage is active.
This action occurs both if the actual temperature drops below the threshold and if it is already be-
low the threshold.
Example 1:
Temperature difference from basic-stage heating: 2 K
Setpoint temperature: 23 °C
Actual temperature: 19 °C
Additional stage is active until the actual temperature reaches 21 °C.
Note
00.0...02.0...25.5
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 182