QoS Object (Class Code: 0x48)

Overview

Quality of Service (QoS) is a general term that is applied to mechanisms used to treat traffic streams with different relative priorities or other delivery characteristics. Standard QoS mechanisms include IEEE 802.1D/Q (Ethernet frame priority) and Differentiated Services (DiffServ) in the TCP/IP protocol suite.

The QoS Object provides a means to configure certain QoS-related behaviors in EtherNet/IP devices.

The QoS Object is required for devices that support sending EtherNet/IP messages with non-zero DiffServ code points (DSCP) or sending EtherNet/IP messages in 802.1Q tagged frames.

Instance attributes with application access

Attribute ID	Access Rule	NV	Name	Data Type	Value	Description
4	Get ¹, Set	NV	DSCP Urgent	USINT	Default DSCP: 55 [110111]	DSCP value for CIP transport class 0/1 Urgent priority messages That is: CIP transport class 0/1 messages with Urgent priority
5	Get ¹, Set	NV	DSCP Scheduled	USINT	Default DSCP: 47 [101111]	DSCP value for CIP transport class 0/1 Scheduled priority messages That is: CIP transport class 0/1 messages with Scheduled priority
6	Get ¹, Set	NV	DSCP High	USINT	Default DSCP: 43 [101011]	DSCP value for CIP transport class 0/1 High priority messages That is: CIP transport class 0/1 messages with High priority
7	Get ¹, Set	NV	DSCP Low	USINT	Default DSCP: 31 [011111]	DSCP value for CIP transport class 0/1 Low priority messages That is: CIP transport class 0/1 messages with Low priority
8	Get ¹, Set	NV	DSCP Explicit	USINT	Default DSCP: 27 [011011]	DSCP value for CIP explicit messages (transport class 2/3 and UCMM) and all other EtherNet/IP encapsulated messages That is: CIP UCMM CIP transport class 2/3 all other EtherNet/IP encapsulation messages

Table Footnotes:
¹ Get access only with application's Get function

NOTE:

A change of the value of the above attributes shall take effect the next time the device restarts.

Functions
uint32_t	EI_API_ADP_getQoS (T *pAdp_p, EI_API_ADP_SQos_t *pAdpQoS_p)
	Get the current QoS settings (Instance Attribute IDs: 4 - 8). More...
uint32_t	EI_API_ADP_setQoS (T *pAdp_p, const EI_API_ADP_SQos_t *pQoS_p)
	Set the current QoS settings (Instance Attribute IDs: 4 - 8). More...