Example for planning and implementing a project:

Project Description

  • New office building with room automation for 136 rooms over 4 floors as well as preparing the appropriate primary plants.
  • Each floor is leased by another tenant and has its own occupancy and use, i.e. the room operating mode as well as associated room setpoints, lighting per floor with central operation, and emergency function over all floors.
  • Blinds control for each facade, including protection, service, and emergency function over all floors, a central weather station, demand-control of primary plants.
  • Schedulers together with a calendar for room operating modes and lighting for each floor, superposed functions on a monitoring device.
  • Primary plants for air handling, heat generation and distribution as well as central distribution of refrigeration on equipment rooms.
  • Primary plants and general: 5 PXC4.E16-2 and 1 PXC5.E003
  • Desigo room automation: 121 DXR2 or PXC3.E…
  • Network infrastructure: Visualization and monitoring in the event of failure

Functional display of an example topology

Planning and implementation, IP network

Core level

A core switch is not needed since everything is located on one IP segment.

Distribution level

In the distribution level, in the riser zones, i.e. floor distributors:

  • 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

Planning and implementation, BACnet network

A BACnet internetwork is built using a BACnet network. All Desigo devices communicate on the same UDP port, e.g. 0xBAC0.

Local and global broadcasts are not critical for this amount of devices, rooms, and plants, i.e. BBMD configuration is not required.

Planning and implementation, HVAC and room automation

Plant scope:

  • Desigo PXC4/7 to control primary plants.

Building scope:

  • Desigo PXC5/7 for superposed functions, e.g. scheduler for occupancy and use times by floor and monitoring Desigo room automation stations.
  • Desigo DXR2.E18/PXC3.E… for central functions over multiple floors.
  • Desigo PXC5.E003 for HVAC central functions

Floor scope:

  • Desigo DXR2.E18/PXC3.E… for central functions.
  • Desigo PXC4/PXC5.E003 for HVAC central functions
  • Desigo DXR2.E../PXC3.E... for room and room segments / HVAC, lighting, and blinds.

If project implementation permits (from a cost standpoint), we recommend distributing monitoring of Desigo room automation stations or schedulers for the floors over different monitoring units (PXC5.E003).

Planning and implementation of central functions

Central function

1st floor

Tenant A

Floor 1

Tenant B

Floor 2

Tenant C

Floor 3

Tenant D

The entire building, across floors

Hardware

AS1001

AS2001

AS3001

AS4001

AS5001

Central weather station

 

 

 

 

CenWthStn

Central setpoint generation via seasonal compensation

 

 

 

 

CenSsn

Central operating mode determination

CenOp_EG

CenOp_1OG

CenOp_2OG

CenOp_3OG

 

AS500

Scheduler for room operating mode

SchedOp0

Scheduler, room operating mode ground floor

SchedOp1

Scheduler, room operating mode 2nd floor

SchedOp2

Scheduler, room operating mode 3rd floor

SchedOp3

Scheduler, room operating mode 4th floor

 

Central operation lighting

CenOpLgt_EG

CenOpLgt_1OG

CenOpLgt_2OG

CenOpLgt_3OG

 

AS500

Scheduler for lighting, building occupancy

SchedLg0

Scheduler, lighting occupancy, ground floor

SchedLg1

Scheduler, lighting, building occupancy, 2nd floor

SchedLg2

Scheduler, lighting, building occupancy, 3rd floor

SchedLg3

Scheduler, lighting, building occupancy, 4th floor

 

AS500
Scheduler for lighting, system operation

SchedLg6

Scheduler, lighting system operation. First floor

SchedLg7

Scheduler, lighting system operation. 2nd floor

SchedLg8

Scheduler, lighting system operation. 3rd floor

SchedLg9

Scheduler, lighting system operation. 4th floor

 

Central emergency function lighting

CenEmgLgt_EG

CenEmgLgt_1OG

CenEmgLgt_2OG

CenEmgLgt_2OG

 

Central emergency lighting (overall)

 

 

 

 

CenEmgLgt

Central shading operation

CenOpShd_EG

CenOpShd_1OG

CenOpShd_2OG

CenOpShd_3OG

 

AS500

Scheduler for shading, building occupancy

SchedSh0

Scheduler, shading, occupancy, ground floor

SchedSh1

Scheduler, shading, occupancy, 2nd floor

SchedSh2

Scheduler, shading, occupancy, 3rd floor

SchedSh3

Scheduler, shading, occupancy, 4th floor

 

AS500

Scheduler for shading, system operation

SchedSh6

Scheduler, shading system operation. Ground floor

SchedSh7

Scheduler, shading system operation. 2nd floor

SchedSh8

Scheduler, shading system operation. 3rd floor

SchedSh9

Scheduler, shading system operation. 4th floor

 

Central emergency shading (overall)

 

 

 

 

CenEmgShd

Central protection function shading

 

 

 

 

CenPrtShd

Central service function

Blinds

CenSrvShd_EG

CenSrvShd_1OG

CenSrvShd_2OG

CenSrvShd_3OG

 

Central facade shading west

 

 

 

 

CenFcdShd_W

Central facade shading south

 

 

 

 

CenFcdShd_S

Central facade shading east

 

 

 

 

CenFcdShd_E

Hot water supply chain

 

 

 

 

SplyHw

Supply chain chilled water

 

 

 

 

SplyChw

Recommendation: Network components

  • Siemens SCALANCE XB005 - as the edge switch for cabling PXC and Desigo room automation stations.
  • Siemens SCALANCE XB005 - At the distribution level in the riser zones.
  • Siemens SCALANCE XB205 - At the distribution level with port mirroring for diagnostics.

IT security and IT basic protection

The elements of infrastructure, IT systems, networks, and applications must be discussed under the aspects of security and appropriate measures need to be developed. Customer, domestic, or industry guidelines and directives must be observed under all circumstances.

For additional details, see Desigo Cybersecurity Guidelines Application Guide (A6V14142297) and Practical Guide on IP Networks in Building Automation and Control Systems (CM110668).

Summary

The following tables show how to depict all devices and network components in a small project.

Plant category

Number of IP devices

PXC primary plants

5

PXC3/DXR2 individual room control & central functions

121

PXC5.E003 system controller, building scope

1

Reserves 5%

6

Amount

133

Network components

Type Siemens

Layer

Managed

No.

Edge switch per floor

XB005

2

No

9

Distribution switch in the equipment rooms

XB200

2

Yes

1

Description

2nd floor

DXR2

3rd floor

DXR2

4th floor

DXR2

5th floor

DXR2

Primary plant

System level

VLAN

VLAN 01

VLAN 01

VLAN 01

VLAN 01

VLAN 01

VLAN 01

UDP port

BAC0

BAC0

BAC0

BAC0

BAC0

BAC0

Subnet mask

255.255.255.0

255.255.255.0

255.255.255.0

255.255.255.0

255.255.255.0

255.255.255.0

Default gateway

192.168.11.254

192.168.11.254

192.168.11.254

192.168.11.254

192.168.11.254

192.168.11.254

Engineering notebook XWP/ABT

 

 

 

 

 

192.168.11.251

Number of DXR2

30

30

30

30

 

 

Reserve IP addresses

220

220

220

220

 

 

IP address range for DXR2 from…

192.168.11.11

192.168.11.51

192.168.11.101

192.168.11.151

 

 

IP address range for DXR2 ...to

192.168.11.50

192.168.11.100

192.168.11.150

192.168.11.200

 

 

Central functions floor (DXR2…)

192.168.11.50

192.168.11.100

192.168.11.150

192.168.11.200

 

 

Central functions for the overall building (PXC3/DXR2)

 

 

 

 

 

192.168.11.201

System controller monitoring floors (PXC5.E003)

 

 

 

 

 

192.168.11.202

Number of PXC

 

 

 

 

5

 

Reserve IP addresses

 

 

 

 

249

 

IP address range PXC primary plants from…

 

 

 

 

192.168.11.203

 

IP address range PXC primary plants ...to

 

 

 

 

192.168.11.210

 

IP address range Mgmt'stations Desigo CC from…

 

 

 

 

 

192.168.11.211

IP address range Mgmt'stations Desigo CC f...to

 

 

 

 

 

192.168.11.215