ABB i-bus EIB Product Manual page 172

®
ABB i-bus EIB / KNX
© 2006 ABB STOTZ-KONTAKT GmbH
Commissioning
Warm start
Options: Bus (read value) /
RAM (old value) /
none (no reaction)
The behaviour of the Application Unit Time on bus voltage recovery is
defined under Warm 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.
If the stored data is still available, the Application Unit Time carries out a so-
called warm start on bus voltage recovery i.e. it can work with the stored
data but it can also use preset data or read relevant data from other bus
devices.
It can be defined how the Application Unit Time should react in the event of
a warm start.
Option: Bus (read value)
After a 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.
In the event of a warm start, a group e.g. is no longer triggered if this group
was already activated in Range A and should be activated again in Range A
after reading the other bus devices and the Trigger parameter is no longer
set to A, B (always).
Option: RAM (old value)
After a bus voltage recovery, the Application Unit Time uses the stored
values. Depending on the stored values i.e. the state prior to the bus voltage
failure 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: 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.
In the event of a warm start, the group is only triggered if all other criteria
have been met e.g. the last value received prior to the bus failure was in
Range B and the first value received after bus voltage recovery is in Range
A.
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