Omron CJ2 CPU UNIT - Page 158

5 Installation
5-14
CJ2 CPU Unit Hardware User’s Manual
3 Attach the End Cover to the Unit on the far right side of the Rack.
● CJ2H CPU Unit
● CJ2M CPU Unit
Additional Information
There is no Backplane for the CJ-series. The PLC is constructed by connecting Units together
using the connectors on the sides.
Precautions for Correct UsePrecautions for Correct Use
• Always turn OFF the power supply before connecting Units to each other.
• Always turn OFF the power supply to the entire system before replacing a Unit.
• A maximum of 10 Units can be connected in any one CPU or Expansion Rack. If more than
the maximum number of Units are connected, a too many I/O points error (fatal error) will
occur and the CJ2 CPU Unit will not operate in either RUN or MONITOR mode. If this occurs,
the I/O Overflow Flag (A401.11) will turn ON and A407.13 to A407.15 (I/O Overflow Details 2)
will turn ON.
CPU Rack
Power Supply
Unit
CPU Unit
(I/O Control Unit) *1
I/O Units (10 max.)
End Cover
(included with CPU Unit)
*1: Connect the I/O Control Unit directly to the CPU Unit to enable connecting Expansion
Racks.
CPU Rack
Power Supply
Unit
CPU Unit
(I/O Control Unit) *1
I/O Units (10 max.)
End Cover
(included with CPU Unit)
*1: Connect the I/O Control Unit directly to the CPU Unit to enable connecting Expansion Racks.
*2: Up to two Pulse I/O Modules can be connected to the left of the CPU Unit.
(Pulse I/O Module) *2 (Pulse I/O Module) *2
*3: Connect the I/O Interface Unit directly to the Power Supply Unit.
Expansion Rack
I/O Interface Unit *3
I/O Units (10 max.)
End Cover
(included with
I/O Interface Unit)
Power Supply
Unit