Omron NX Series Hardware User Manual

4-3
Designing the I/O Power Supply Sys-
tem
This section describes how to design the I/O power supply to the NX Units connected to the NX-series
NX502 CPU Unit.
4-3-1
I/O Power Supply Method
There are the following three methods to supply the I/O power supply to the NX Units depending on
the type and model of the NX Units.
Supply method Description
Supply from the NX
bus
Power is supplied through the NX bus connectors by connecting an I/O power supply
to the I/O power supply terminals on the Additional I/O Power Supply Units.
Supply from external
source
Power is supplied to the Units from an external source.
I/O power is supplied by connecting an I/O power supply to the terminal blocks on the
Units.
No supply The I/O power supply is not needed when the NX Unit does not use it for the connect-
ed external devices, or when power for the interface is generated inside the NX Unit.
Refer to the user’s manuals for individual NX Units or to the NX-series Data Reference Manual (Cat.
No. W525) for the power supply method for specific NX Units.
An example is shown below.
NX-series
NX502 CPU Unit
I/O power
supply (AC)
No supply
I/O
power
supply
Additional
I/O Power
Supply
Unit
DC Input
Unit
Relay
Output
Unit
Relay
Output
Unit
Transistor
Output
Unit
Commu-
nications
Interface
Unit
Supply from external source
Supply from the
NX bus
External
device
External
output
device
External
output
device
External
input
device
External
output
device
I/O power
supply (DC)
I/O power supply terminals
I/O power supply
(24 VDC, etc.)
End Cover
4 Designing the Power Supply System
4-14
NX-series NX502 CPU Unit Hardware User's Manual (W629)

Omron NX Series Specifications

General

Brand	Omron
Model	NX Series
Category	Controller
Language	English