ABB i-bus
®
KNX
Parameters
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 292
7.12.1
Connect analog room control unit to physical device input a
Options:
No
Yes
This parameter determines whether an analog room control unit should be connected to the device
in order to adjust setpoints and fan speed.
•
No
: No analog room control unit is connected.
•
Yes
: An analog room control unit is connected to the device.
Note
Selecting
Yes
means that the device's setpoints can no longer be adjusted with a KNX analog
room control unit, and therefore this option also hides the parameters concerned.
When the device is in controller mode, setpoint adjustments made on the analog room control
unit are forwarded directly to the internal controller. This setting also hides the group objects
Request setpoint adjustment (master)
,
Confirm setpoint (master)
,
Request fan manually (master)
,
Confirm fan manually (master)
,
Request fan speed (master)
and
Confirm fan speed (master)
.
Device input a is set to
Analog room control unit
. Consequently, this input can only be used to
connect the control unit.
The dependent parameters
Maximum setpoint increase
and
Maximum setpoint reduction
appear.
Actuator mode displays the group objects
Request setpoint adjustment (slave)
,
Request fan
manually (slave)
and
Request fan speed (slave)
.
These group objects transmit manual adjustments to the controller.
Note
The group objects used for confirmation are hidden, because the actuator cannot evaluate value
confirmation. Caution! This may result in a discrepancy between the analog room control unit and
the setpoint/fan speed actually set. Since the analog room control unit is manual and cannot send
a value back to the device, someone may set a value that the external controller will not permit.
The easiest way to prevent this is by using the device's own controller instead of an external one.
Alternatively, either ensure that changes made via the analog room control unit are implemented
by the controller, or accept that discrepancies between the actual setpoint/fan speed and the one
set on the device are inevitable.