Omron NX-ID - Power Supply Types and Wiring; Applications of I;O Power Supply and Supply Methods

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4 Installation and Wiring
NX-series Digital I/O Unit User’s Manual (W521)
4-2 Power Supply Types and Wiring
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4-2-1 Applications of I/O Power Supply and Supply Methods
4-2 Power Supply Types and Wiring
There are the following two types of power supplies that supply power to the NX Units.
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 manual
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 Digital I/O Units and sup-
ply methods, and how to calculate the total current consumption from the I/O power supply.
The applications of I/O power supply and supply methods for the Digital I/O Units are given as follows:
The I/O power supply is used for the following applications.
• I/O circuits operations in the Digital I/O Units
• Input current in a Digital Input Unit
• Load current of the external load of a Digital Output Unit
• Power supply for the connected external devices
This power is supplied by one of the following two methods. Refer to A-1 Data Sheet on page A-2 for
the supply method of each NX Unit.
z Supply from the NX Bus
This 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.
For the Units to which I/O power supply is provided by a CPU Rack, refer to Designing the Power
Supply System or Wiring in the hardware user’s manual for the CPU Unit to which NX Units are con-
nected.
For the Units to which I/O power supply is provided by a Slave Terminal, refer to Designing the
Power Supply System or Wiring in the user's manual for the Communications Coupler Unit to be
connected.
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.
4-2-1 Applications of I/O Power Supply and Supply Methods
Applications of I/O Power Supply
I/O Power Supply Method