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5 Installation and Wiring
NX-series Safety Control Unit User’s Manual (Z930)
5-2 Wiring the Power Supply to the Slave Terminal
5
5-2-4 NX-series Power Supply-related Units
Refer to 2-2 Specifications of Individual Units on page 2-3 for the current consumption from I/O
power supply of each model of Safety I/O Unit and the input current for each model of Safety Input
Unit.
The Communications Coupler Unit supplies the NX Unit power and I/O power to the NX Units in the
Slave Terminal. The Units that are related to power supply for the NX Series other than the Communi-
cations Coupler Unit are listed in the following table.
For the details on the NX-series power supply-related Units, refer to the NX-series System Units User’s
Manual (Cat. No. W523). For information on the most recent lineup of NX Units, refer to NX-series cat-
alogs or OMRON websites, or ask your OMRON representative.
5-2-4 NX-series Power Supply-related Units
Name Function
Additional NX Unit
Power Supply Unit
This NX Unit provides the NX Unit power supply.
This NX Unit is used when the total power consumption of the NX Units in the Slave Termi-
nal exceeds the NX Unit power supply capacity of the Communications Coupler Unit.
The I/O power supply for the Additional NX Unit Power Supply Unit is connected to the NX
Unit on the left through the NX bus connector.
Unit power
supply
Unit power
supply terminals
Communications Coupler Unit
NX Unit
Additional NX
Unit Power Supply Unit
Additional NX
Unit Power Supply Unit
I/O power supply
NX Unit power supplyNX Unit power supply
NX Unit
power supply
NX Unit
power supply
Separated by Additional NX Unit Power Supply Unit.Separated by Additional NX Unit Power Supply Unit.
The total power consump-
tion from the NX Unit power
supply is within the NX Unit
power supply capacity.
The total power consumption from
the NX Unit power supply is within
the NX Unit power supply capacity.
Internal
power
supply
circuits
Internal
power
supply
circuits
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