Omron NXEIP202 User Manual page 101

 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.
Unit power
supply terminals
Unit power
supply
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.
Name
EtherNet/IP Coupler Unit
Digital Input Unit
Relay Output Unit
• 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
NX-series EtherNet/IP Coupler Unit User's Manual (W536)
Additional NX Unit Power Supply Unit block
EtherNet/IP Coupler Unit block
NX Units connected to the
EtherNet/IP Coupler Unit
EtherNet/IP
Coupler Unit
NX Unit power supply
∙ ∙ ∙
Internal power supply circuits
Model
NX-EIC202
NX-ID3317
NX-OC2633
5 Designing the Power Supply System
NX Units connected to the Additional
NX Unit Power Supply Unit
NX Unit power supply
Unit power
supply terminals
Additional NX Unit Power Supply Unit
Quantity Power consumption/Unit
1 1.6 W
5 0.5 W
5 0.8 W
End Cover
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