Basic System Configuration and
Devices
CJ2 CPU Unit Hardware User's Manual
This section describes the basic system configuration and devices used in a CJ2 PLC.
The CJ Series supports the following two types of system configuration.
• Basic System Configuration:
System consisting of CPU Rack and Expansion Racks.
• Expanded System Configuration:
System connected via CPU Unit built-in serial port and PLC Units, such as Communi-
cations Units.
2-1-1
Basic System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-1-2
CPU Rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-1-3
Expansion Racks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2-1-4
Configuration Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2-1-5
2-1-6
2-2-1
Serial Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2-2-2
2
2-1