GE IC695PNC001 - Page 73

GFK-2571A Chapter 4 System Operation 4-5
4
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
PROFINET
Controller
Priority
Ethernet Traffic
Description
7
Highest priority
MRP
Media Redundancy
6
Second-highest
priority
RT_CLASS_1
Cyclic PROFINET IO
High Priority RTA_CLASS_1
High-Priority PROFINET
Alarms
5
Third-highest
priority
Low Priority RTA_CLASS_1
Low-Priority PROFINET
Alarms
4, 3, 2, 1
Lowest priority
(reserved)
(reserved)
0
IP
DCP
Device Discovery and
Configuration
If a system includes external switches, these switches must be configured to match the VLAN
Priority groupings listed above for the PNC.