Basic Documentation

BACnet networks with MS/TP t
runks
Application examples
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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.
BACnet MS/TP networks can have a max. cable length depending on the set baud rate. If the overall length
is, however, exceeded, a new BACnet network must be created and connected via a BACnet MS/TP IP
router to BACnet/IP over the Ethernet.
The rules apply again for BACnet/IP networks, i.e. the Ethernet network must be installed as an
unmanaged layer 2 switch. Of course, a PXC.. can integrated in the given zones to control primary plants,
depending on building planning.
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
Planning and implementation, BACnet networks
A BACnet internetwork is built using a multiple BACnet networks. All BACnet/IP capable Desigo devices
communicate on the same UDP port, e.g. 0xBAC0.
Desigo CC
Workstation
Floor 3 -
Unmanaged
Layer 2 Switch
30x DXR
AS_4002..
Floor 2 -
Unmanaged
Layer 2 Switch
Floor 1 -
Unmanaged
Layer 2 Switch
Managed/
Unmanaged
Layer 2 Switch
AS_5001 AS500
IP Segment
Range 192.168.11.x
BACnet Network 100
UDP Port 0xBAC0
AS01
AS02
AS05
Ground Floor -
Unmanaged
Layer 2 Switch
PXG3.M
AS_4030
......
BACnet
NW 40
30x DXR
AS_3002..
PXG3.M
AS_3030
......
BACnet
NW 30
30x DXR
AS_2002..
PXG3.M
AS_2030
......
BACnet
NW 20
30x DXR
AS_1002..
PXG3.M
AS_1030
......
BACnet
NW 10
AS_4001
AS_3001
AS_2001
AS_1001
5x PXC100-E.D
Air Treatment,
Heating/Cooling Circuits
PXC.. Primary Plants
DXR2.E18
Central Functions
PXC00-E.D
Time Control Switch & Monitoring
Central Functions & Monitoring
DXR2.E..
Central Functions
DXR2.E..
Central Functions
DXR2.E..
Central Functions
DXR2.E..
Central Functions