Omron sysmac NX Series User Manual page 95

Unit name
Additional I/O Power
Supply Unit
NX-series System Units User's Manual (W523)
This NX Unit provides additional I/O power supply.
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 the maxi-
mum current of I/O power supply of the Communication Control Unit
•
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.
Case (a)
Communication
Control Unit
NX Unit
Internal
power
supply
circuit
I/O power
supply
Unit power
supply
Case (b)
Communication
Control Unit
NX Unit
Internal
power
supply
circuit
I/O power
supply
Unit power
supply
• When different I/O power supply voltage is used.
• When separating the power supply systems.
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
Function
Separated by Additional
I/O Power Supply Unit
Additional I/O Power Supply Unit
I/O power
supply
When the I/O power supply becomes
the following states for the
subsequent NX Units.
• When it exceeds the maximum
current of I/O power supply
• When it goes below the voltage
specifications of the connected
external devices
Separated by Additional
I/O Power Supply Unit
Additional I/O Power Supply Unit
I/O power
supply
4
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