Application
Ref. no. 2103 REG ES
Page 15
of 44
The counter levels are calculated in intervals of one second.
If there is a power failure to the KNX system, the values of the energy counters (but
not the 1/4-hour counters) are backed up and reloaded to the appropriate
communication objects on restarting.
5.2.3. Rate
counters
In addition, the device possesses three counting units (hereinafter referred to as cost
counters), which count the costs for each Rate. Exactly one communication object of
type DPT 13.xxx is assigned to each of these counters and their value reflects the
current cost level in Euro cents. The following figure shows the three cost counters in
relation to the basic measurand and the three-phase current counters:
Calculation of the cost counters
As Fig. 7 shows, all three Rate-related three-phase current counters are derived from
the measurand of the active three-phase current power. This is counted in the time
during which the appropriate Rate is active (or mathematically integrated by time).
The value of a cost counter results from the multiplication of the three-phase current
counter with the price of the appropriate Rate.
We would like to point out that the three-phase current counter values and cost
counter values shown in Fig. 7 can also be negative, if the basic active three-phase
current power is negative.
