4-2
Power Supply Types and Wiring
This section describes the power supply types and wiring.
4-2-1
Power Supply Types
There are the following two types of power supplies that supply power to the NX Units.
Power supply name
Description
NX Unit power supply This power supply is used for operating the NX Units.
I/O power supply
This power supply is used for driving the I/O circuits of the NX Units and for the con-
nected external devices.
The method for supplying power to the NX Units and the wiring method depend on the specifications
for the CPU Unit to which NX Units are connected or the specifications for the Slave Terminal. Refer to
Designing the Power Supply System
or
Wiring
, which are described both in the hardware user’s man-
ual for the CPU Unit to which NX Units are connected and user’s manual for the Communications
Coupler Unit, for details on the method for supplying power to the NX Units and the wiring method.
The subsequent sections describe the applications of I/O power supply for the High-speed Analog In-
put Units and supply methods, and how to calculate the total current consumption from the I/O power
supply.
4-2-2
I/O Power Supply Applications and Methods
This section describes the I/O power supply applications and methods for the High-speed Analog In-
put Units.
I/O Power Supply Applications
The I/O power supply is used for the following applications.
• Operation of the trigger input circuit in the High-speed Analog Input Units
• Input current to the trigger input terminals of the High-speed Analog Input Units
• Power supply for external devices connected to trigger input terminals of the High-speed Analog In-
put Units
I/O Power Supply Method
Power is supplied by the following method.
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 Communications Coupler Unit or Additional I/O Power Supply Unit.
Refer to
Designing the Power Supply System
and
Wiring
in the hardware user’s manual for the
connected CPU Unit for details on Units to which I/O power is supplied in a CPU Rack.
4 Installation and Wiring
4 - 4
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
