CJ1W-EIP21 Omron, CJ1W-EIP21 Datasheet - Page 409

• Manufacturer Part Number: CJ1W-EIP21
• Description: Ethernet I/P Module
• Manufacturer: Omron

Specifications of CJ1W-EIP21

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
CIP Object
Object Model
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.”
External request
(Example. Read, Write)
Service
Object
Device
Object
Processing
Object Instance
Object
CIP Message Communications
Data
Data
Data
Data
Appendix D
Attribute
381