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5 Designing the Power Supply System
NX-series EtherNet/IP Coupler Unit User’s Manual (W536)
5-1 Power Supply System and Design Concepts
5
5-1-3 Design Concepts for Power Supply to the EtherNet/IP Slave Terminal
The following must be studied when designing the power supply system to the EtherNet/IP Slave Ter-
minal.
• The NX Unit power supply and I/O power supply systems must be designed and then the design con-
ditions for both must be confirmed.
• The external power supplies (i.e., Unit power supply and I/O power supplies) must be selected.
I/O Power Supply Con-
nection Unit
This NX Unit is used when there are not enough I/O power supply terminals for the
connected external devices that are connected to NX Units such as Digital I/O Units
and Analog I/O Units.
* Wire colors have been changed according to revisions in the JIS standards for photoelectric
and proximity sensors. The colors in parentheses are the wire colors prior to the revisions.
5-1-3 Design Concepts for Power Supply to the EtherNet/IP Slave Ter-
minal
Unit name Function
I/O power
supply
DC Input Units
(NPN type)
Two-wire sensor*
(e.g., limit switch)
NX Unit
Three-wire sensor
with NPN output*
(e.g., photoelectric sensor
or proximity sensor)
Brown (White)
Blue (Black)
Black (White)
Brown (Red)
Blue (Black)
I/O Power Supply
Connection Unit
(16 IOG terminals)
Example of NPN type
Not enough I/O power
supply terminals
I/O Power Supply
Connection Units
I/O power supply is not separated at
the I/O Power Supply Connection Units.
Additional I/O
Power Supply Unit
Unit power
supply
I/O power
supply
I/O Power Supply
Connection Unit
(16 IOV terminals)
EtherNet/IP
Coupler Unit
A1
A8
B1
B8
A1
A8
B1
B8
A1
A8
B1
B8
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOV
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
IOG
1
9
7
5
3
13
11
15
0
8
6
4
2
12
10
14
Internal
power
supply
circuit
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