A Desigo room automation system function group comprises parts of the Desigo room automation stations on the BACnet internetwork. Grouping occurs based on Desigo room automation stations assignment to PX system function responsible for the Desigo room automation subsystem functions.

Desigo room automation defines Desigo room automation system functions comprising life check and time synchronization.

The current limits for the Desigo room automation system function group are mainly imposed by life check and scheduling carried out by the Desigo room automation system function PX.

A PXC3 generally controls several (about 5..8) multiple rooms. The number of rooms in the Desigo room automation system function group are the decisive factor for some limits.

Desigo room automation stations are not part of a PX site. Data are not aligned between the primary PX site and the Desigo room automation stations.

Desigo room automation stations do not support BBMDs. This restricts the BACnet/IP network, that is, all Desigo room automation stations and their Desigo room automation system function PX or a PXG router must be located in the same IP segment.

Desigo room automation stations with own alarming

Item

Limit

Description

Trend per room

5

It is assumed that a maximum of 5 trend points are logged on average. Assumption for the trend interval: 15 minutes.

Number of external BACnet references

500

Maximum number of external BACnet references that support a Desigo room automation system function PX. The Desigo room automation system function PX requires external references for the life check and for scheduler functions. Examples of objects with external references:

- EventEnrollment: 1reference

- Schedule: 1-5 references

Event enrollment per Desigo room automation station

1

Number of event enrollment objects required on the Desigo room automation system functions PX for the life check per Desigo room automation station.

Sample number of Desigo room automation stations per Desigo room automation system function group

250

Desigo room automation system function PX with maximum scheduler functions.

The limit designates the maximum number of Desigo room automation stations in the Desigo room automation system function group. In this example, it is assumed that the following scheduler objects are available on the Desigo room automation system function PX:

- Maximum number of scheduler objects

- Per scheduler object, maximum number of external references

Sample number of Desigo room automation stations per Desigo room automation system function group

500

Desigo room automation system function PX without scheduler functions.

The limit designates the maximum number of Desigo room automation stations on the Desigo room automation system function group. In this example, it is assumed that no scheduler objects are available on the Desigo room automation system function PX.