Omron CJ1W-EIP21 用户手册

This appendix describes CIP message communications.

The basic concepts of CIP message communications are described in this appendix from CIP Object on
page 381 through Example of CIP Message Creation on page 386. Read these sections to improve your
understanding of CIP message communications.

In the CIP (Common Industrial Protocol) system, each device is modeled as a group of “Objects.” An Object
abstractly represents a related group of the device’s data values.

When accessing the device from the outside, access an Object.

An Object represents the abstracted device function, processing, and the resulting data.

A request from the outside of Object, such as Read Data, is called “Service.”

Data belonging to the Object is called “Attribute.”

The actual entity of Object is called “Instance” or “Object Instance.”

When Object is generalized, it is called “Class.” For example, “Japan” is one of Instances (Object Instances) of
Class “Nation.”

Object

Object

Object

Device

Service

Data

Processing

Object Instance

Attribute

External request  
(Example. Read, Write)

Data

Data

Data