Omron NX Series User Manual page 70

4 Installation and Wiring
The following are wiring diagrams (examples) for each power supply.
Communications Coupler Unit
Unit power supply
terminals
I/O power
supply
Unit
power supply
(24 VDC)
Precautions for Correct Use
Always use separate power supplies for the Unit power supply and the I/O power supply. If
you supply power from the same power supply, noise may cause malfunctions.
Additional Information
Refer to the user's manual for the Communications Coupler Unit on design for power supply
to the Slave Terminal.
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(Example) DC Input Unit
24 VDC I/O
power supply
Additional I/O
Power Supply Unit
A1
IOV
IOG
IOV
IOG
A8
NX Unit
Internal power
supply circuit
I/O power supply terminals
To external
devices
24 VDC Unit
power supply
Additional DC Input Unit
NX Unit Power
Supply Unit
B1 A1 B1 A1
IOV UV UV
UG UG
IOG
NC
IOV NC
IOG
B8 A8 B8 A8
NX Unit Additional NX Unit
power supply Power Supply Unit
The I/O power supply is
separated.
To external
devices
I/O
External
External
power
output output
supply
device device
I/O power supply (Supply from external source)
NX-series System Unit User's Manual (W523)
Two-wire
sensor
B1
0 1
IOV IOV
Three-wire
IOG IOG
sensor
2 3
IOV
IOV
IOG IOG
B8
NX Unit
power supply
The I/O power
supply is not
separated.
End Cover
Additional
I/O Power
To external
Supply
devices
Unit