Manualshelf

User Manual

ManualsBrandsSiemens ManualsBuilding automationDesigo Building Automation System 6.2 - Technical Principles
111112113114115116117118119120
Global objects and functions
Life check
7
120 | 353 CM110664en_07
The role of the Desigo room automation server and third-party
BACnet device
Server/Function Function and description
Desigo room automation server /
Third-party BACnet device
The Desigo room automation server acts like a standard BACnet device.
Life check The Desigo room automation server / third-party BACnet device is monitored by the primary
server or the backup server.
Start-up No coordinated start-up.
Replication No global objects to be replicated.
The role of the clients
Server/Function Function and description
Clients A client can read global objects from the primary server or any backup server. A client may only
modify a global object (e.g., with WriteProperty) on the primary server. Each client must therefore
recognize the primary server of a site. A client can query the identification of the primary server of
a site.
Replicated objects from backup servers which are not online or which are connected to the
BACnet network at a later stage, are updated by the primary server as soon as the primary server
becomes aware of them. This occurs after a restart of the automation station, after connecting it
to the network or on expiry of the synchronization request period [SynReqp].
The role of the alternative primary server
Server/Function Function and description
Alternative primary server If the primary server fails, no global objects can be modified. You can configure any backup server
of the site to act as the primary server using a client or Xworks Plus (XWP).
7.3 Life check
The life check checks if all devices of the site (primary server, backup server,
Desigo room automation server or third-party BACnet device) work correctly,
that is, if they are operating and if they are running their application.
● The primary server monitors if the backup servers / Desigo room
automation servers are active.
● The backup servers monitor if the primary server is active.
● The primary server checks that only one primary server exists at any one
time on a given site.