ABB i-bus
®
KNX
Group objects
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 338
No.
Function
Group object name Data Type
Flag
73
Status Control value Addi-
tional-stage cooling
Channel – Controller 1 byte / 1 bit
DPT 5.001 / 1.001
C, R, T
The group object is enabled if "Deactivated" was not selected for the parameter "Additional-stage cooling" in
the "Application parameters" parameter window.
This group object is hidden in actuator mode.
The group object data point type depends on the selected application and the associated control.
Output is via a 1-byte value (DPT 5.001) when the following control types are selected:
•
2-point 1 byte (0/100 %)
•
PI continuous (0…100 %)
•
PI continuous (0…100 %) for Fan Coil
Output is via a 1-bit value (DPT 1.001) when the following control types are selected:
•
2-point 1 bit (On/Off)
•
PI PWM (On/Off)
Note
The control type is preselected by the parameter
Additional-stage cooling
in this case. A certain type of
control is preset depending on the selected application. The control type is freely selectable if
Free
configuration
is selected in this parameter.
This group object outputs the control value for Additional-stage cooling.
Use of a physical device output (e.g. valve) for Additional-stage cooling.
•
The group object contains the control value that the controller uses to control the output.
Additional-stage cooling is controlled only via group object (no internal use):
•
The group object sends the control value for controlling a different actuator.
Note
Depending on the input group objects of the actuator, it could be necessary to change the output of the
control value between 1 byte and 1 bit. This is performed via the parameters described above.
Note
Cyclical sending and sending on change of the group object can be set under Extended settings in the
Room thermostat – Basic-stage heating
parameter window.
74
Not assigned
75
Actual temperature
Channel – Controller 2 bytes
DPT 9.001
C, R, T
This group object is always enabled in controller mode.
This group object is hidden in actuator mode.
This group object indicates the current actual temperature value (room temperature) that the controller is us-
ing.
This value consists of the value(s) measured via the physical device inputs and the values received via the
two group objects
External temperature 1
and
External temperature 2
.
The values recorded via the inputs are averaged, and this mean value is then combined with the values re-
ceived via the group object. A weighting factor can be defined for the combination process.
The transmission reaction of this group object is set in the
Room thermostat
parameter window.
Note
This group object can also be used for display on analog room control units and visual display sys-
tems.