4-3-3
Power Supply-related Units and Wiring Methods
The Communications Coupler Unit supplies the NX Unit power and I/O power to the NX Units in the
Slave T
erminal.
There are the following types of NX-series power supply-related Units other than Communications
Coupler Unit.
Refer to NX-series catalogs or OMRON websites, or ask your OMRON representative for information
on the most recent lineup of NX Units.
Unit name Function
Additional NX Unit
Power Supply Unit
This NX Unit provides NX Unit power supply.
This NX Unit is used when the total power consumption of the NX Units in the Slave
Terminal exceeds the 
NX Unit power supply capacity of the Communications Coupler
Unit.
Unit power
supply 
terminals
Communications 
Coupler Unit
NX Unit
I/O power 
supply
 
 
 
 
 
 
Unit power
supply
NX Unit power
supply
Additional NX Unit 
Power Supply Unit
NX Unit power supply
Separated by Additional NX Unit Power Supply Unit
The total power consumption
from the NX Unit power supply 
is within the NX Unit power 
supply capacity.
The total power consumption
from the NX Unit power supply 
is within the NX Unit power 
supply capacity.
Internal
power 
supply
circuit
Internal
power 
supply
circuit
The I/O power supply for the Additional NX Unit Power Supply Unit is connected to the
NX Unit on the left through the NX bus connector.
4 Installation and Wiring
4-17
NX-series System Units User's Manual (W523)
4-3 Wiring the Power Supply to the Slave Terminal
4
4-3-3 Power Supply-related Units and Wiring Methods