ABB i-bus KNX Product Manual page 38

®
ABB i-bus KNX
Commissioning
•
No: The DG/S does not assign DALI addresses, either in normal mode or on gateway supply voltage
recovery. If a DALI device without an address has been installed, the DG/S can only control it using a
broadcast telegram (manual operation). A DALI address is not necessary for this purpose. If a DALI
device with an existing address has been installed, the DG/S will not change it.
Pause between two DALI QUERY polls
Options:
This parameter sets the interval between DALI QUERY polls. The gateway automatically and cyclically
sends a brightness value query on the DALI to each possible DALI device (Actual Level DALI query).
A 0 setting runs the QUERY poll as quickly as possible. The interval between QUERY telegrams is around
30...40 ms.
The gateway uses this poll to establish whether a DALI device with a DALI address is present. If it does
not receive a response from the monitored DALI device, the gateway interprets this as a device fault.
If it does receive a response, it polls other properties of the DALI device (e.g. lamp faults and DALI device
type).
This time setting has a direct impact on the DALI telegram bus load. A long interval reduces the load
significantly. However, the disadvantage of this is that a fault on a DALI device may not be detected
straight away. Likewise, it takes longer to detect a new or recovered device.
Other than this, the setting has no influence on DALI telegram rate. DALI commands (e.g. switching,
dimming and brightness value settings etc.) and status signals (e.g. brightness values, emergency lighting
information etc.) or functions in progress (e.g. staircase lighting, forced operation etc.) are neither
influenced nor delayed.
Note
We recommend that you keep the default settings. The only time that it makes sense to increase the
interval between DALI QUERY polls is for example if an emergency lighting switch is installed in the
DALI line, so as to allow more time for switching.
36 2CDC507164D0201 | DG/S x.64.1.1
0...2...255 x 100 ms