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External Switch VLAN Priority Settings
The PROFINET-IO specification indicates the VLAN priorities for each type of Ethernet traffic that
originates from a PROFINET node. VLAN priorities range from 0 to 7, with 7 being the highest.
The switch on an RX3i PNC supports just four traffic classes, giving four levels of preference.
Incoming traffic without a VLAN priority is assigned to the lowest priority traffic class. The table
below lists the VLAN priorities, and their corresponding priorities in the PNC:
VLAN
Priority
7
Highest priority
6
Second-highest
priority
5
Third-highest
priority
4, 3, 2, 1
Lowest priority
0
If a system includes external switches, these switches must be configured to match the VLAN
Priority groupings listed above for the PNC.
GFK-2571A
PROFINET
Ethernet Traffic
Controller
Priority
MRP
RT_CLASS_1
High Priority RTA_CLASS_1
Low Priority RTA_CLASS_1
(reserved)
IP
DCP
Chapter 4 System Operation
Description
Media Redundancy
Cyclic PROFINET IO
High-Priority PROFINET
Alarms
Low-Priority PROFINET
Alarms
(reserved)
Device Discovery and
Configuration
4
4-5
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