ABB i-bus
®
KNX
Function
AC/S 1.x.1 | 2CDC508198D0211 Rev. A 33
4.6 Special operating states
4.6.1 Reaction on bus and supply voltage failure, recovery, download and ETS reset
4.6.1.1 Bus voltage failure
Bus voltage failure describes the sudden drop in/failure of the bus voltage, e.g. due to a power failure.
If the bus voltage fails but the supply voltage is present, the device continues to operate normally and
signals a corresponding error on the web user interface. The device can still be reached using the web
user interface and BACnet.
4.6.1.2 Bus voltage recovery
Bus voltage recovery is the state after bus voltage is restored after failing previously due to a bus voltage
failure.
On bus voltage recovery, a corresponding message is output on the web user interface and the group
objects are updated, however not initially sent on the bus. New values after bus voltage recovery are sent
normally again.
4.6.1.3 Supply voltage failure and recovery
On the failure of the supply voltage, the device stops its function and, with the aid of the built-in backup
power, saves the operating states within 20 to 60 seconds before it shuts down automatically. An error
message is output on the web user interface.
After the supply voltage has been restored, also while on backup power, the device restarts and restores
the operating states saved.
The internal device clock status remains "invalid" until the device receives the time and date after starting.
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