Wednesday, December 8, 2010

Feedback for Analog Output objects

Trying to get through my email backlog, I saw a very good question from Jörg to the BACNET-L list (probably unanswered because it was sent just before a 4-day holiday weekend here in the U.S.): Why isn't there an optional Feedback_Value property in the Analog Output object?

As I answered in part on the list, in order to implement it in the way it is done on the Binary Output object one would also need Deadband and Time_Delay properties, different from the ones already present, in order to implement a COMMAND_FAILURE-like algorithm. Not that that's a bad thing. This might be a useful type of alarm.

Some of the work of the "Alarm Summit" group might provide a way to do this fairly easily perhaps and without new properties. But that work remains in the Objects & Services group for now. It's a big step and I can understand if folks are cautious about it.

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