Overview

This topic describes the attributes related to the QoS service.

For CPUs, the following attributes are available only for those without RIO scanner service.

Description of Attributes

Attribute

Description

Enabled

When selected (true), the module adds DSCP tags to the IP header of each Ethernet packet that it transmits to indicate its priority.

It also enables the attributes of the other subcategories of QoS.

PTP

Attribute

Default value

Description

DSCP PTP Event Priority

59

Range: 0 to 63

DSCP PTP General Priority

47

Range: 0 to 63

EtherNet/IP Traffic

Attribute

Default value

Description

I/O Data Scheduled Priority Messages

47

DSCP value for I/O data scheduled priority messages that use the EtherNet/IP protocol.

Range: 0 to 63

Explicit Messages

27

DSCP value for explicit messages that use the EtherNet/IP protocol.

Range: 0 to 63

I/O Data Urgent Priority Messages

55

DSCP value for I/O data urgent priority messages that use the EtherNet/IP protocol.

Range: 0 to 63

I/O Data High Priority Messages

43

DSCP value for I/O data high priority messages that use the EtherNet/IP protocol.

Range: 0 to 63

I/O Data Low Priority Messages

31

DSCP value for I/O data low priority messages that use the EtherNet/IP protocol.

Range: 0 to 63

Modbus TCP Traffic

Attribute

Default value

Description

I/O Messages

43

DSCP value for I/O messages that use the Modbus TCP protocol.

Range: 0 to 63

Explicit Messages

27

DSCP value for explicit messages that use the Modbus TCP protocol.

Range: 0 to 63

Network Time Protocol Traffic

Attribute

Default value

Description

Network Time Protocol Messages

59

DSCP value for network time protocol (NTP) messages.

Range: 0 to 63