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ABB i-bus
KNX
Parameters
Settings
Engine Settings parameters
Cycle time
Options:
Defines the minimum time for the logic calculation cycle
Use persisting values
Options:
•
Yes: The device stores the internal information of certain function elements. To see which data are
saved, please refer to the descriptions of the relevant function elements.
Persisting values
Power failure
If the power fails (24 V DC or PoE) the device safeguards certain internally calculated values, e.g.
staircase lighting time or the integral value of the PID controller. The device continues to operate for 20 to
60 seconds using backup power (depending on the processing power). If power is restored during this
time, the device continues to operate normally.
If the power failure exceeds the backup time, the logic shuts down safely.
When power has been restored, the device restarts.
Failure of the bus voltage
If the bus voltage fails but the power supply is running, the device continues to operate normally and saves
all internal values. Bus-dependent calculations such as the Calendar or Timer function also run normally,
but no telegrams are sent.
On bus voltage recovery bus the ASM sockets are updated to their current values.
ETS download
After an ETS download, all internal information is saved and restored. This also applies to internally
calculated values (e.g. staircase lighting time and the integral value of the PID controller).
If an element was removed from the previous parametrization, its internal value is discarded.
If an element was added, its internal value will be set to the default (usually 0).
80 2CDC508198D0211 Rev. A | AC/S 1.x.1
200...65535 ms (unsigned integer)
No (checkbox cleared)
Yes (checkbox selected)
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