Central function

A central function implements central control functions and coordinated demand and forced signals. A central function acts through a group in the 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 Desigo CC management platform 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).

Control of
central functions

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 operating element
  • Schedulers or reaction programs
  • Commands from a higher, central control.

After evaluating signals and command, they are distributed via group by the group manager to the group members.

Groups

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

Grouping functions help structure and centrally control large numbers of different system elements and data. Grouping can take place by organizational, geographic, functional, or cross-discipline criteria. Group cooperation supports data exchange between central control functions and individual system elements.

Hierarchical groups

A group manager can for its part be a group member of a superposed group manager.

Grouping on multisegment
applications

The group function is also used to combine multiple DXR2 room automation stations to large rooms to coordinate room segments on the individual automation stations.