User Manual

Table Of Contents
Network architecture
BACnet architecture (MLN & ALN)
14
CM110664en_07 191 | 351
The device name is the object name of the BACnet device object.
Guidelines
Different rules for object names apply for configuring TD (Technical Designation), UD (User Designation),
or FD (Free Designation):
The TD is generated from predefined partial names, separated by an apostrophe ('), that show the
technical hierarchy with plant, partial plant, and component. The TD is supplemented by site name and
pin name.
The names may consist of upper- and lowercase letters and numbers 0 to 9. The site name is
separated by a colon (:) and the pin name by a period (.). The maximum total length is 30 characters.
The UD is formed similar to the TD based on partial names. However, users determine the partial
names, structure, and separators. The names consist of upper- and lowercase letters, numbers 0 to 9,
and separators, such as _-;=’, etc. The maximum total length (including site name and pin name) is 80
characters.
The FD is a freely assigned name consisting of letters, numbers and a few special characters, limited
within the system only by uniqueness and length. The maximum total length is 80 characters, ten of
which, plus one separator, are reserved for the site name.
Category Device name Description
Unconfigured ““ Empty string for unconfigured devices
Class A No rules
Class B1 Meaningful text for the user (this text is used as a
reference for the alarm recipient)
Class B2 Model name + device ID Model name + “ “ + 8 character device ID (hexadecimal).
The device name for temporary devices is generated
automatically.
Class B3 Max. 25 characters
Class C Site name + automation station name Site name + “:“ + automation station name
Examples from the topology at the beginning of the chapter:
Category Site number Device
number
Device ID Site name Device name Device name
A 1 0x02000001 Third-party 1 Third-party 1
B1 1 0x02100001 Desigo CC 1 Desigo CC 1
B2 15 0x02100401 PXM20TMP0210040f
C 1 1 0x02200401 Cham PXC #1 Cham:PXC #1
C 1 2 0x02200402 Cham PXC #2 Cham:PXC #2
C 1 3 0x02200403 Cham PXC... #1 Cham:PXC... #1
C 2 1 0x02200801 Zug PXC #1 Zug:PXC #1
C 2 2 0x02200802 Zug PXC... #1 Zug:PXC... #1
C 3 1 0x02200C02 Baar PXC #1 Baar:PXC #1
BACnet device parameters
The BACnet device parameters are written to the devices during commissioning. These parameters include
the following values: