ABB i-bus EIB Product Manual page 137

®
ABB i-bus EIB / KNX
© 2006 ABB STOTZ-KONTAKT GmbH
Commissioning
Cold start
Options: Bus (read value) /
Init (use initial value) /
none (no reaction)
The behaviour of the Application Unit Time on bus voltage recovery is
defined under Cold start.
Information that is currently stored in the Application Unit Time e.g. Group 1
triggered, is stored for at least 1 h on bus voltage failure. If the bus voltage
failure lasts for longer than 1 h, the Application Unit Time automatically
detects whether the information is still stored or whether there has been a
data loss. The application program and the parameters are permanently
stored in the Application Unit Time.
In the event of a data loss, the Application Unit Time carries out a so-called
cold start on bus voltage recovery i.e. it can no longer access the stored
data and must either work with preset data or read relevant data from other
bus devices.
It should further be noted that the time switch program does not start
automatically after a cold start as the current time or date are no longer
available. See also Internal clock.
It can be defined how the Application Unit Time should react in the event of
a cold start.
Option: Bus (read value)
After bus voltage recovery, the Application Unit Time reads out the relevant
data from other bus devices. Depending on the value received and the
criteria for triggering the group, it either triggers the group in Range A or
Range B or it does not trigger the group.
Option: Init (use initial value)
The Application Unit Time uses preset values after bus voltage recovery.
Depending on the preset values and the criteria for triggering the group, it
either triggers the group in Range A or Range B or it does not trigger the
group.
What is the initial value?
If the Application Unit Time should use a preset value after a bus voltage
recovery with data loss i.e. after a cold start, this value is listed under Initial
value.
Option: none (no reaction)
The Application Unit Time only triggers a group if a telegram with a value in
Range A or Range B has been received.
The group is always triggered in principle after a cold start on receipt of the
first value which lies in Range A or Range B.
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