Open the Page
Access the (quality of service) page from the tab ():
Configure the QoS in Control Expert.
Click to expand the list of parameters.
This page is updated every 5 seconds.
Service Status
This table shows the possible states for the :
Status |
Description |
|---|---|
|
The service is correctly configured and running. |
|
The service is disabled. |
|
The status of the service is not known. |
Diagnostic Information
This page displays information about the QoS service that you configure in Control Expert.
When you enable QoS, the module adds a differentiated services code point (DSCP) tag to each Ethernet packet it transmits, thereby indicating the priority of that packet:
Field |
Parameter |
Description |
|---|---|---|
Precision Time Protocol |
DSCP PTP Event Priority |
Point-to-point time synchronization. |
DSCP PTP General |
Point-to-point general. |
|
EtherNet/IP Traffic |
DSCP Value for I/O Data Scheduled Priority Messages |
Configure the priority levels to prioritize the management of data packets. |
DSCP Value for Explicit Messages |
||
Modbus/TCP Traffic |
DSCP Value for I/O Messages |
NOTE: We
recommend that you use a larger timeout value for explicit messaging
connections and a smaller timeout value for implicit messaging connections.
The specific values that you employ depend on your application requirements.
|
DSCP Value for Explicit Messages |
||
Network Time Protocol Traffic |
DSCP Value for Network Time |
— |
Considerations
Take measures to effectively implement QoS settings in your Ethernet network:
Use only network switches that support QoS.
Apply the same DSCP values to all network devices and switches.
Use switches that apply a consistent set of rules for handling the different DSCP values when transmitting and receiving Ethernet packets.