Designing The I/O Power Supply System; I/O Power Supply Method - Omron NX1P2 series User Manual

4 Designing the Power Supply System
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
NX1P2 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
Supply from the NX bus Power is supplied through the NX bus connectors by connecting an I/O power supply
Supply from external
source
No supply
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 NX1P2 CPU Unit
I/O power supply terminals
4 - 10
to the I/O power supply terminals on the Additional I/O Power Supply Units.
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.
The I/O power supply is not needed when the NX Unit does not use it for the connected
external devices, or when power for the interface is generated inside the NX Unit.
Addi- DC
tional I/O Input
Power Unit
Supply
Unit
I/O
power
supply
I/O power supply
(24 VDC, etc.)
Supplied from the
External
NX bus.
input
device
Supply from external source
I/O power supply (AC)
No supply
Description
Relay Relay Transistor
Output Output Output
Unit Unit Unit
External
output
device
I/O power supply (DC)
External External
output output
device device
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
Com-
munica-
tion
Inter-
face
Unit
End Cover
External
device