Basic Documentation

BACnet/IP networks
Designing BACnet/IP networks
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● Unmanaged layer 2 switches are planned that are connected with copper cable.
● A managed layer 2 switch is planned for network diagnostics and troubleshooting where a management
platform is connected. An unmanaged layer 2 switch can be used as well if the customer has no special
requirements.
Edge level
Only unmanaged layer 2 switches are planned as edge switches. The following applies:
● Important rooms / Desigo room automation stations are implemented in a star topology on a
distribution switch or remote edge switch.
● Unimportant rooms / Desigo room automation stations (max. 20) are networked in a line topology
(daisy chain).
● Central functions / Desigo room automation stations are implemented using star cabling on the layer 2
switch (e.g. AS4001).
● PXC… for the primary plants and superposed functions in the equipment room are implemented in star
cabling on a layer 2 switch.
IP/VLAN overview
Network designation Network Address range
Building automation and control 192.168.11.0/24 192.168.11.2….192.168.11.254
Requires more than 200 IP addresses
Building automation and control 192.168.11.0/23 Max. 510 usable IP addresses
Desigo CC
Workstation
3. Floor -
Unmanaged
Layer 2 Switch
30x PXC3/DXR
AS_4001 AS_4002 ...
AS_4030AS_4029... AS_4028
2. Floor -
Unmanaged
Layer 2 Switch
1. Floor
Unmanaged
Layer 2 Switch
Managed/
Unmanaged
Layer 2 Switch
Central Functions & Monitoring
AS_5001
AS500
DXR2.E18
Central Functions
PXC00-E.D
Monitoring
PXC.. Primary Plants
IP Segment
Range 192.168.11.x
BACnet Network 100
UDP Port 0xBAC0
30x PXC3/DXR
AS_3001 AS_3002 ...
AS_3030AS_3029... AS_3028
AS01
AS02
AS05
5x PXC100-E.D
Air Treatment,
Heating-/Cooling Circuits
30x PXC3/DXR
AS_2001 AS_2002 ...
... AS_2030
Ground Floor
Unmanaged
Layer 2 Switch
30x PXC3/DXR
AS_1001 AS_1002 ...
... AS_1030