User Manual

System configuration
Desigo room automation system function group limits
22
CM110664en_07 317 | 351
22.3 Desigo room automation system function group limits
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.