There are central functions within Desigo Automation for occupancy, lighting, shading, and emergency lights. This permits joint control of rooms belonging to a group as well as manual operation on the management platform or using a scheduler. The individual states can be displayed and switched using the Central Function Viewer.

What are central functions?

Central control functions permit and support the centralized control and coordination of defined groups. Typical centralized control functions include:

  • Central occupancy definition
  • Central setpoints.
  • Central hot water/chilled water coordination (Optimization of primary plants, supply chain optimization).
  • Central lighting control.
  • Central emergency lighting control
  • Central blinds control.
Building overview

Various source provide input for a central control function, including:

  • Signals from an external system.
  • Commands from a system operator.
  • Commands from a building user.
  • Signal from Desigo automation stations
  • Commands from a scheduler program.
  • Commands from superposed central control.

These signals and commands are evaluated by the central control function. The central control function sends the result via the group master and group members to the subordinate control functions.

 

HVAC Application

The figure illustrates how the central function acts on the individual rooms, if data does not flow. There are only two renters.

Central function HVAC

Control Concept for Central Operator Function

 

Function

Description

A

Central function

Controls the rooms for renter A.

B

Room operation

Controls the room for renter A.

C

Central function

Controls the rooms for renter B.

D

Room Operation

Controls the room for renter B.

NOTE:
In contrast to lighting and blinds, central function HVAC cannot be controlled hierarchically (Renter > Floor > Building).

 

Lighting

The figure illustrates how the central function acts on the individual rooms, if data does not flow. There are only two renters.

Central function lighting

Control Concept for Central Operator Function

 

Function

Description

A

Fire alarm

Switches the light in the hallways and stairwells.

B

Central function

Controls the light throughout the building.

C

Central function

Control the light on an entire floor.

D

Central function

Controls the light in rooms for renter B.

E

Room operation

Controls the light in the room for renter B.

F

Central function

Controls the light in rooms for renter A.

G

Room operation

Controls the light in the room for renter A.

NOTE:
Central function lighting an be controlled hierarchically (Renter > Floor > Building).

 

Shading

The figure illustrates how the central function acts on the individual rooms, if data does not flow. The west facade is not depicted.

Central function shading

Control Concept for Central Operator Function

 

Function

Description

A

Fire alarm

Raise the blinds throughout the building.

B

Wind or frost.

Raise the blinds throughout the building.

C

Scheduler program

Acts on the entire building (priority 8 or 13).

D

Central function

Control blinds throughout the building.

E

Service function

Controls blinds for the applicable area.

F

Central function

Controls blinds for the applicable area.

G

Scheduler program

Controls blinds for the applicable area.

H

Room operation

Controls the blinds in the room.

NOTE:
The central function shading can be controlled hierarchically (Facade > Building).

 

Emergency lighting

The figure illustrates how the central function for emergency lighting acts on the individual emergency lights in a building, if data does not flow.

Central Function Emergency Lighting

Control Concept for Central Emergency Lighting

 

Function

Description

A

Test group 1

Controls the test function for emergency lighting for group 1.

B

Test report group 1

Controls the test report for emergency lighting for group 1.

C

Test group 2

Controls the test function for emergency lighting for group 2.

D

Test report group 2

Controls the test report for emergency lighting for group 2.

E

Fire alarm

Switches on emergency lighting in halls and stairwells. The signal occurs via a binary input that normally is controlled by a separate Danger Management System. Desigo Automation is then used to control lighting.

NOTE:
A building must be subdivided into a minimum of two test groups to guarantee the availability of emergency lighting.