Unit name Function
Additional I/O Power
Supply Unit
This NX Unit provides additional I/O power supply.
This Unit is used when the I/O power supply for the NX Unit connected to the CPU
Unit is supplied through the NX bus.
Additionally use this NX Unit in the following cases.
a. When the I/O power supply capacity is insufficient
• When the total current consumption for the I/O power supply exceeds 4 A
• When a voltage drop in the I/O power supply causes the voltage of the I/O pow-
er supply to go below the voltage specifications of the I/O circuits or connected
external devices
b. Separating the I/O power supply
• When connected external devices have different I/O power supply voltages
• When separating the power supply systems
When the I/O power supply becomes
the following states for the subsequent
NX Units.
• When it exceeds 4 A
•
When it goes below the voltage specifications
of the connected external devices
Case (a)
• When different I/O power supply voltage are used.
• When separating the power supply systems.
Case (b)
I/O power
supply
Unit power
supply
Separated by Additional
I/O Power Supply Unit
I/O power
supply
Internal power
supply circuit
NX-series
CPU Unit
*1. The NX Unit to which I/O power is supplied from the NX bus
I/O power
supply
Unit power
supply
Separated by Additional I/O Power Supply Unit
I/O power
supply
Internal power
supply circuit
NX-series
CPU Unit
*1. The NX Unit to which I/O power is supplied from the NX bus
Additional I/O Power
Supply Unit
Additional I/O
Power Supply Unit
NX Unit
*1
Additional I/O
Power Supply Unit
Additional I/O Power Supply Unit
NX Unit
*1
The NX Unit power supply of the Additional I/O Power Supply Unit is connected to the
NX Unit on the left through the NX bus connector.
4 Installation and Wiring
4-13
NX-series System Units User's Manual (W523)
4-2 Wiring the Power Supply to the CPU Unit
4
4-2-3 Power Supply-related Units and Wiring Methods
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