"深入剖析Ethernet/IP：PUB00213R0开发者指南"

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The "EtherNet/IP Developers Guide" provides comprehensive information and guidance on Ethernet/IP, a widely used industrial network protocol. It covers topics such as the basics of Ethernet/IP, its application in industrial automation, network configuration, device integration, troubleshooting, and best practices for implementing Ethernet/IP in various industrial settings. The handbook serves as a valuable resource for vendors and developers looking to understand and implement EtherNet/IP technology. It outlines a quick start guide for vendors, offering step-by-step instructions on how to develop and deploy EtherNet/IP devices and systems. The guide emphasizes the importance of adhering to industry standards and ensuring compatibility with other EtherNet/IP devices. The publication also highlights important concepts such as the Common Industrial Protocol (CIP), CIP Motion, CIP Safety, CIP Sync, CompoNet, and ControlNet. These protocols are essential for ensuring seamless communication and interoperability between different devices on the EtherNet/IP network. Overall, the "EtherNet/IP Developers Guide" is a comprehensive and practical resource for vendors and developers looking to harness the power of Ethernet/IP in industrial applications. It provides a detailed overview of the technology, practical guidance on implementation, and best practices for ensuring reliable and efficient operation in industrial settings.

Objects, Services, and Application Data

What services does EtherNet/IP provide?

The CIP application layer denes a set of application objects and device proles that dene common

interfaces and behaviors. In addition, CIP communication services enable end-to-end communication

between devices on the different CIP networks. EtherNet/IP maps the CIP communication services to

Ethernet and TCP/IP, enabling multi-vendor interoperability between devices on Ethernet as well as with

the other CIP networks.

Simplied EtherNet/IP Object Model

Overview

Within the CIP application layer, devices

are represented using an object model

(Figure 4). Application objects dene how

device data is represented and accessed

in a common way. Network-specic

objects dene how parameters such as IP

addresses are congured and EtherNet/IP

specic functions.

Communication objects and services

provide the means to establish

communication associations and access

device data and services over the network.

Exposing Application Data with CIP

Objects within a device are groups of related data and behavior associated with this data. CIP requires

certain objects to describe a device, how it functions, communicates and its unique identity. The Identity

Object, for example, contains identity data values called attributes that are used to store the identity

information of a device. Attributes for the Identity Object include the Vendor ID, Device Type, device

serial number and other identity data. CIP does not specify how object data is implemented, rather, which

data values or attributes must be supported and made available to other CIP devices.

There are three types of objects dened by CIP:

Required Objects must be included in all CIP devices. These objects include the Identity Object,

the Message Router Object and network-specic objects.

Application Objects describe how data is encapsulated by a device. These objects are specic

to the Device Type and function. For example, an input device would have an input object with

attributes that describe the value and fault status of a particular input point.

Vendor-specic Objects describe services that are specic to a particular vendor; they are

optional and not described in a predened Device Prole.

Addressing data within a CIP device utilizes the same object-oriented view. A class (of objects) is a set of

objects that represent the same type of system component (Figure 5). Sometimes it is necessary to have

more than one ‘copy’ of an object, called object instances, within a device. This set of objects is called an

object class. Each instance of the object class will have the same set of attributes, but will have a unique

set of values. An object instance or an object class has attributes, providing services and implementing

behavior.

Figure 4

This EtherNet/IP simplied Object Model denes data,

services, connections, and their relationships

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