113Re: [BACnetLighting] Feedback DMF-011
- Nov 8, 2006Steve,
We use the On_Delay in our lighting products. The main user of this feature is in large warehouses. It's not a "real" lighting application but here is how it is used. The large exhaust fans in warehouses have louvers that need opened before a fan starts and needs to close only after the fan stops. Typically the user will open the louvers 10 seconds before turning the fan on and wait a certain period of time after turning the fan off before closing them. I am not sure if there are other similar applications that are not lighting apps, but are used with lighting devices.
Staff Firmware Engineer
Square D / Schneider Electric
Steve Karg <steve@...>
Sent by: BACnetLighting@yahoogroups.com
11/08/2006 10:45 AMPlease respond to
BACnetLighting@yahoogroups.comccSubject Re: [BACnetLighting] Feedback DMF-011
Hi Jörg (and other interested parties),
> o On_Delay (REAL, seconds) Off_Delay (REAL, seconds): If thevice
> Present_Value is changed from 0 to some value greater than zero or
> versa the dim action is delayed for the time given in these properties.We are discussing DMF-011-10 in SSPC 135 BACnet committee today, and are
discussing the use-case for On_Delay. The only use-case that we see is
using it for distributed start to keep the load from many Lighting
Output objects from creating a load spike.
The objections of having an On_Delay property is that this use-case
should really be a client feature, not an end-point object feature,
since scheduling a lot of Lighting Output objects would happen once, for
example, in the morning. Any subsequent accesses to the Ligthing Output
objects would probably not need the On_Delay, and so On_Delay creates
more problems than it solves.
Any discussion for or against having On_Delay property in the Lighting
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