Features And System Configuration - Omron CJ1W-CORT21 Operation Manual

Features and System
Configuration
CJ-series User Defined CAN Unit Operation Manual for NJ-series CPU Unit (W517)
This section provides an introductory overview of CAN bus, its functions and how to
setup and configure a network. It also addresses the User Defined CAN Unit its config-
uration, features and specifications.
1-1 User Defined CAN Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-2 Overview of CAN Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1-2-1 CAN Communication Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1-2-2 Physical CAN Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
1-2-3 Principles of Data Exchange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-11
1-2-4 Principles of Non-Destructive Bitwise Arbitration . . . . . . . . . . . . . . . . . . . . . . .1-11
1-2-5 Efficiency of Bus Allocation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1-2-6 Message Frame Formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
1-2-7 Detecting and Signaling Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
1-2-8 Data Reliability of the CAN Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
1-2-9 Extended Format CAN Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
1-2-10 Implementations of the CAN Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
1-2-11 Configuring a CAN Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
1-3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
1-3-1 User Defined CAN Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
1-4 Basic Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
1-4-1 Network Installation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22
1-4-2 User Defined CAN Unit Startup Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
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