Setting the device instance – Rockwell Automation 20-750-BNETIP BACnet/IP Option Module User Manual
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Rockwell Automation Publication 750COM-UM005B-EN-P - June 2014
Chapter 3 Configuring the Option Module
Setting the Device Instance
A BACnet Device Instance number is used to identify a BACnet device over the
BACnet network. A Device Instance number must be unique across all subnets
and routed links.
The Device Instance number could be configured depending upon the adopted
network strategy. For example
shows a Building level network having
two individual floor networks through a router which allows devices on each
network to share the same IP address. Each device on the network in this example
has a unique Device Instance number consisting of 4 digits. The first digit
represents the Building or Floor number. The last 3 digits represent the fourth
octet of the device’s IP address.
Figure 3 - Building Automation Network Example
1.
Set the value of
Device Parameter 18 – [Device Instnc] to a unique
Device Instance number.
This Device Instance number should not be repeated within a BACnet
network. By default, the Device Instance number is set to 100.
2.
Reset the option module; see
Resetting the Option Module on page 33
so
that the new Device Instance number takes effect.
Building Level Network 1
Floor Level Network 1 (BACnet IP)
Building Level Network 2
Building
Controller 1
Other Brand
Building Automation
Product
IP Add. 192.168.120.121
Device Instance
1
001
IP Add. 192.168.120.122
Device Instance
1
002
IP Add. 192.168.120.123
Device Instance
1
050
IP Add. 192.168.120.124
Device Instance
1
127
Other Brand
Building Automation
Product
Router
Bldg 1/Flr 1
Building
Controller 2
Floor Level Network 1 (BACnet IP)
Other Brand
Building Automation
Product
IP Add. 192.168.112.211
Device Instance
2
001
IP Add. 192.168.112.212
Device Instance
2
002
IP Add. 192.168.112.213
Device Instance
2
050
IP Add. 192.168.112.214
Device Instance
2
127
Other Brand
Building Automation
Product
Bldg 2/Flr 2
Stopped
0.00 Hz
0 << 65535
ESC
ENTER
AUTO
F
Edit Device Instnc
100