4 Installation and Wiring
4 - 8
NX-series Digital I/O Unit User’s Manual (W521)
4-2 Wiring the Power Supply to the Slave
Terminal
This section describes how to supply power to the Slave Terminal and wiring.
There are the following two types of power supplies that supply power to the Slave Terminal.
4-2-1 Power Supply Types
Power supply name Description
Unit power supply This is the power supply for generating the NX Unit power supply required for the Slave
Terminal to operate.
This is connected to the Unit power supply terminal on the Communications Coupler Unit
or on the Additional NX Unit Power Supply Unit.
The internal power supply circuit in the Communications Coupler Unit or the Additional
NX Unit Power Supply Unit generates the NX Unit power supply from the Unit power sup-
ply.
The internal circuits of the Communications Coupler Unit and NX Units operate by the NX
Unit power supply.
The NX Unit power supply is supplied to the NX Units in the Slave Terminal through the
NX bus connectors.
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.
This is connected to the I/O power supply terminal on the Communications Coupler Unit
or the Additional I/O Power Supply Unit.
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
The I/O power supply is supplied to the NX Units from the I/O power supply terminals and
through the NX bus connectors.
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