Omron CJ2-CPU User Manual

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5 Designing the Power Supply System
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
5-4 Selecting External Power Supplies and Protective Devices
5
5-4-1 Selecting the Unit Power Supply
 Blocks
A block consists of the Unit that supplies the NX Unit power and the range of Units to which that Unit
supplies the NX Unit power. For example, in the configuration in the following figure there are two
blocks in the EtherNet/IP Slave Terminal: the block with the EtherNet/IP Coupler Unit and the block
with the Additional NX Unit Power Supply Unit.
The total of the required Unit power supply capacity for these two blocks is the required power sup-
ply capacity of the Unit power supply for the EtherNet/IP Slave Terminal.
Precautions for Correct Use
Use the same Unit power supply to supply the Unit power to the entire Slave Terminal. If you
supply power from different Unit power supplies, differences in electrical potential may cause
unexpected currents in the NX Unit power supply, which may result in failure or malfunction.
 Calculation Example
This section provides a calculation example for the configuration example that is given in 5-2-2 Cal-
culation Example for the NX Unit Power Supply on page 5-7.
• The NX Unit power supply efficiency of the EtherNet/IP Coupler Unit is 70%.
In this configuration example, there is only one block, the EtherNet/IP Coupler Unit block.
Required power supply capacity of Unit power supply to EtherNet/IP Slave Terminal
= Required Unit power supply capacity of EtherNet/IP Coupler Unit block
= (Power consumption from NX Unit power supply of EtherNet/IP Coupler Unit + Total power
consumption from NX Unit power supply of NX Units connected to EtherNet/IP Coupler
Unit)/NX Unit power supply efficiency of EtherNet/IP Coupler Unit
= (1.6 W + (0.5 W × 5) + (0.8 W × 5))/0.7
= Approximately. 11.6 W
Name Model Quantity Power consumption/Unit
EtherNet/IP Coupler Unit NX-EIC202 1 1.6 W
Digital Input Unit NX-ID3317 5 0.5 W
Relay Output Unit NX-OC2633 5 0.8 W
∙ ∙ ∙
Unit power
supply
Unit power
supply terminals
Additional NX Unit Power Supply Unit
Internal power supply circuits
Unit power
supply terminals
EtherNet/IP Coupler Unit block
Additional NX Unit Power Supply Unit block
NX Units connected to the
EtherNet/IP Coupler Unit
NX Units connected to the Additional
NX Unit Power Supply Unit
NX Unit power supply
EtherNet/IP
Coupler Unit
NX Unit power supply
End Cove
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Omron CJ2-CPU Specifications

General

Brand	Omron
Model	CJ2-CPU
Category	Controller
Language	English