Planning And Application; Functions - ABB i-bus KNX Product Manual

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ABB i-bus KNX

Planning and application

4 Planning and application
4.1

Functions

The following functions are available and are explained in this chapter. A detailed description of the pa-
rameters and communication objects can be found in chapter 3.
•
Meter reading
•
Instruments and power values
•
Load control
•
Time
•
Scene
•
Connection/logic
•
Safety/forced operation
The following illustration indicates the sequence, in which the functions are processed. Communication ob-
jects, which lead to the same box, have the same priority and are processed in the sequence, in which the
telegrams are received.
Example
If both communication objects Logical connection x are activated, a telegram received via a communica-
tion object Switch is connected to them. The result of this action serves as the input signal for the
function Time. If this is not blocked, a corresponding switch signal is generated, e.g. delay or flashing. In
the next step, a check is performed to determine if a shedding stage has been received, whether an
intermediate meter has triggered a switch telegram or whether a value has exceed or is below a thresh-
old value. Before the switch telegram of the relay is reached, the communication objects Safety priority
x and Forced operation are checked and undertaken, if required, as a priority. Subsequently, the switch-
ing action is only dependent on the state of the bus voltage. The relay is switched if a switching action
allows it.
SE/S 3.16.1 | 2CDC 505 084 D0203 119