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BACnet Networking
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BACNET PRIORITY ARRAY
BACnet uses a command prioritization scheme for objects that control equipment or software
parameters that affect the operation of equipment connected to devices. The use of this command
prioritization scheme (commonly referred to as
Priority Array
) allows a device to determine the order in
which an object is controlled. Command Prioritization assigns unique levels of priority to the different
types of devices that can write values to a device. There are 16 prioritization levels with Level 1 being
highest and Level 16 the lowest. For example:
Priority Level
Application
Priority Level
Application
1
Manual-Life Safety
9
Available
2
Automatic-Life Safety
10
Available
3
Available
11
Available
4
Available
12
Available
5
Critical Equip. Control
13
Available
6
Minimum On/Off
14
Available
7
Available
15
Available
8
Manual Operator
16
Available
BACnet defines the types of objects that are either required or may optionally support the command
prioritization scheme.