2-1
Basic System Configuration
An NX-series Controller NX502 supports the following two types of configurations.
• Basic Configuration
The basic configurations include the CPU Unit and the Configuration Units that are controlled direct-
ly by the CPU Unit. The followings are basic configurations.
a) EtherCAT network configuration
b) NX Unit configuration
c) X Bus Unit configuration
• Other Network Configurations
These are the configurations of the systems that are connected to the CPU Unit’s built-in
EtherNet/IP ports and Communications Units.
Basic Controller Configuration
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EtherCAT Network Configuration
With an NX-series CPU Unit, you can use an EtherCAT network as a basic system.
With the EtherCAT network system of the NX-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
Manual (Cat. No. W505).
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NX Unit Configuration
The CPU Rack consists of the following items.
• NX502 CPU Unit
• NX Unit NX-£££££££
• End Cover NX-END02
Up to 63 NX Units can be connected.
By using the NX Units that support synchronous I/O refreshing, all I/O refreshing is synchronized
with the task period of the primary periodic task of the CPU Unit.
This enables high-precision synchronized control with a stable fixed period.
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X Bus Unit Configuration
The CPU Rack consists of the following items.
• NX502 CPU Unit
•
X Bus Unit NX-EIP201, etc.
Up to four X Bus Units can be connected.
The X Bus Unit power is supplied directly from the Unit power supplied to the CPU Unit. A total of
50 W of DC power can be supplied. Therefore, external power supply is not required.
2 System Configuration
2-2
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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