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Basic System Configuration Section 2-3
2-3 Basic System Configuration
2-3-1 Overview
CJ-series CPU Rack A CJ-series CPU Rack can consist of a CPU Unit, a Power Supply Unit, Basic
I/O Units, Special I/O Units, CPU Bus Units, and an End Cover. A Memory
Card is optional. An I/O Control Unit is required to connect an Expansion
Rack.
CJ-series Expansion
Racks
A CJ-series Expansion Rack can be connected to the CPU Rack or other CJ-
series Expansion Racks. An Expansion Rack can consist of an I/O Interface
Unit, a Power Supply Unit, Basic I/O Units, Special I/O Units, and CPU Bus
Units, and an End Cover.
Note Although the CJ-series PLCs do not require Backplanes, the term “slot” is still
used to refer to the relative position of a Unit in the Racks. The slot number
immediately to the right of the CPU Unit is slot 1, and slot numbers increase
toward the right side of the Rack.
CPU Rack
Power Supply Unit
CPU Unit
(I/O Control Unit)
I/O Units
(Basic I/O Units, Special
I/O Units, CPU Bus Units)
I/O Units
(Basic I/O Units,
Special I/O Units,
CPU Bus Units)
Expansion Rack
Power Supply Unit
(I/O Interface Unit)
End Cover
Memory Card
End Cover
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