ABB i-bus KNX Product Manual page 124

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ABB i-bus KNX
Planning and application
Configuration and function of the intermediate meters:
The meter readings of the intermediate meter are derived from the respective main meter. The meter read-
ing is not lost in the event of a bus voltage failure; however at bus voltage failure or ETS reset, it is possi-
ble that a trigger may be "missed". This is then indicated in the status byte of the intermediate meter.
Example
The intermediate meter should be started by the time 8:00. Due to a bus voltage failure, the time tele-
gram "8:00" is not sent by the timer and the Energy Actuator receives "8:01" after "7:59". As a result, the
intermediate meter is not started and, the intermediate meter is then not correct. (However, the meter
reading of the main meter is correct in this case).
Every intermediate meter has two triggers (trigger 1 and trigger 2).
Trigger 1 is the start event for the intermediate meter. It is possible to select whether the intermediate me-
ter is started by the receipt of a 1 bit telegram or a time (external timer). Optionally, the meter reading at
trigger 1 can be sent and/or reset. The start time can be parameterized but can also be changed via the
bus.
The meter reading is sent on trigger 2. Optionally, the intermediate meter can be stopped with trigger 2. A
switching reaction can be parameterized provided that the intermediate meter can be stopped by trigger 2.
(The switch reaction can only be parameterized with the intermediate meters of the outputs; the intermedi-
ate meter total cannot trigger a switch reaction.) For trigger 2, a 1 bit communication object, a time, a dura-
tion (in minutes) or a limit (in Watt hours) can be selected.
In addition to trigger 1 and trigger 2, a 1 bit communication object Enable reset meters can be enabled.
This enables a very flexible parameterization of the intermediate meter.
122 2CDC 505 084 D0203 | SE/S 3.16.1