3   Nomenclature and Functions
3-26
CJ2 CPU Unit Hardware User’s Manual
3-5 I/O Control Units and I/O Interface 
Units
An I/O Control Unit and I/O Interface Units are used to connect Expansion Racks to expand the system.
Precautions for Correct UsePrecautions for Correct Use
Attached the enclosed cover to the I/O Connecting Cable connector on the I/O Interface Unit
when it is not being used to protect it from dust.
3-5-1 Component Names
3-5-2 System Configuration
The I/O Control Unit is connected directly to the 
CJ2 CPU Unit. If it is not immediately to the 
right of the CPU Unit, correct operation may not 
be possible.
The I/O Interface Unit is connected directly to 
the Power Supply Unit. If it is not immediately to 
the right of the Power Supply Unit, correct oper-
ation may not be possible.
TUO
1
01
CI
TUO
IN
II101
CJ1W-II101 
I/O Interface Unit
CJ1W-IC101 
I/O Control Unit
Output connector for
I/O Connecting Cable
Output connector for
I/O Connecting Cable
Output connector for
I/O Connecting Cable
Power
Supply Unit
Power
Supply Unit
Power
Supply Unit
CPU Unit
CPU Rack
Expansion Rack
CJ1W-IC101
I/O Control Unit
CJ1W-II101
I/O Interface Unit
I/O Connecting Cable
I/O Connecting Cable
CJ1W-II101
I/O Interface Unit