Assortment / System Description

Central function with groups
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8 Central function with groups
A central function implements central control functions and coordinated
demand and forced signals. A central function acts through a group in the
planned rooms or wings. The central function can also collect and compile, via
the group, demand signals or state signals from the wings or rooms.
Hidden behind the central control functions are system functions such as
operator interventions (via BACnet clients, e.g. a management station or via
local operator units), schedulers, automatic reactions, data from a weather
station, etc.
Central functions influence:
● Room operating mode (occupancy and use in room).
● HVAC control via various setpoint requirements dependent on the room
operating mode.
● HVAC setpoints via a weather-dependent adjustment.
Grouping can still be used to coordinate demand, operating, and forced signals,
i.e.:
● Request signals for hot water distribution (heating circuit).
● Request signals for chilled water distribution (cooling circuit).
Various source influence and control central functions:
● An external system or third-party device
● System user via BACnet client, e.g. Desigo CC
● Building user via BACnet client or local operator unit
● Scheduler or reaction program
● Commands from a higher, central control.
After evaluating signals and command, they are distributed via group by the
group master to the group members.
A group combine various rooms, the entire building, a wing, floor, or facade.
One group member exists for the various category that forwards the resulting
information to all associated group members.
Figure: Building with central control functions
Central function
Central function
control
Groups