2 System Configuration
2-2
NJ-series CPU Unit Hardware User’s Manual (W500)
2-1 Basic System Configuration
An NJ-series Controller supports the following two types of configurations.
(1) Basic Configurations
The basic configurations include the CPU Unit and the Configuration Units that are controlled
directly by the CPU Unit. There are two basic configurations.
• EtherCAT network configuration
• CJ-series Unit configuration
(2) Other Network Configurations
These are the configurations of the systems that are connected to the CPU Unit's built-in Ether-
Net/IP port and Communications Units.
EtherCAT Network Configuration
With an NJ-series CPU Unit, you can use an EtherCAT network as a basic system.
With the EtherCAT network system of the NJ-series CPU Unit, the period for sequence processing
and motion processing in the CPU Unit is the same as the EtherCAT communications period. This
enables high-precision sequence control and motion control with a constant period and little
fluctuation.
For information on EtherCAT, refer to the NJ/NX-series CPU Unit Built-in EtherCAT Port User's Man-
ual (Cat. No. W505).
CJ-series Unit Configuration
CPU Rack
The CPU Rack consists of the following items.
• NJ-series CPU Unit
• NJ-series Power Supply Unit
• CJ-series Configuration Units
*
CJ-series Basic I/O Units, Special I/O Units, and CPU Bus Units
• I/O Control Unit
An I/O Control Unit is required to connect an Expansion Rack.
• End Cover
* Some CJ-series Configuration Units cannot be used with an NJ-series CPU Unit.
Refer to CJ-series Configuration Units on page 2-11 for information on the models you can use with an NJ-
series CPU Unit.
Expansion Racks
You can connect an Expansion Rack to an NJ-series CPU Rack or to another Expansion Rack. A
CPU Unit cannot be mounted to an Expansion Rack. The rest of the configuration is the same as for
an NJ-series CPU Rack.
System Configuration
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