Object Dictionary

Overview

The EtherNet/IP protocol uses object modeling to organize related data and procedures into entities called object. An object is a logical grouping of attributes and services:

Attributes represent the characteristics of an object. These are values that may indicate status or control the objects behavior. The value of an attribute can influence how the object operates, not all attributes affect behavior.
Services are the procedures or actions that an object can perform.

An objects behavior defines how it responds to specific events or conditions.

Objects are grouped into classes, and each object instance is a unique representation of an object within a class. While all instances in a class share the same set of attributes, each instance maintains its own attribute values. These unique values distinguish one instance from another.

The object dictionary defines the attribute values for each object in the device profile, providing a standardized reference for implementation and integration.

LTMT Main Unit Object Dictionary

The general structure of the Ethernet brick object dictionary in the LTMT main unit follows the same format used across all EtherNet/IP devices.

Class Code	Object	Description
0x01	Identity object	Identifiers, such as device type, vendor ID, and serial number.
0x04	Assembly object	Provides collection of other objects attributes (frequently used for I/O messaging).
0x06	Connection manager object	Provides for and manages the run-time exchange of messages.
0x48	QoS object	Manages the traffic streams with different relative priorities or other delivery characteristics.
0xF5	TCP/IP object	Provides description of an opened explicit connection and associated communicator.
0xF6	Ethernet link object	Manages the functionality of the physical attachment to the Ethernet network.
0x29	Control supervisor object	Manages controller functions, operational states, and control.
0x2C	Overload object	Implements overload behavior.
0xC5	Periodically Kept Acyclic Words (PKW) object	Enables cyclic I/O messaging for manufacturer-specific registers.
0xC6	TeSys Tera monitoring control object	Used to select monitoring data available on Assembly 110.
0x300	Stack diagnostic object	Provides information about the EIP stack.
0x302	Adapter diagnostic object	Provides diagnostic information about all the target I/O connections to the EIP stack.
0x303	Explicit messages diagnostic object	Provides a description of an opened Explicit Connection and associated communication.
0x304	Explicit message diagnostic list object	Provides a snapshot of the list of instantiated explicit connection diagnostic objects.
0x109	Link Layer Discovery Protocol (LLDP) management object	Contains administrative information for the LLDP protocol.
0x10A	LLDP data table object	Displays a record of all adjacent LLDP implementing devices that are currently active according to the receive state machine of the LLDP protocol.

These objects are described in detail in the following pages.