*1. For whether NX Units can be connected to the CPU Unit or Communications Coupler Unit to be used, refer to
the user’
s manual for the CPU Unit or Communications Coupler Unit to be used.
Simple I/O Wiring with a Screwless Clamping Terminal Block
The terminal block is a screwless clamping terminal block.
You can connect the wires simply by pushing the ferrules into the terminals. The amount of wiring work
is reduced without requiring the use of screws.
1-1-2
System Unit Types
The types of System Units are as follows.
Type Purpose
System Units These Units are used as required to build a CPU Rack or a
Slave Terminal.
Additional NX Unit Power
Supply Unit
This Unit is used when the NX Unit power supply is insuf
fi-
cient.
Additional I/O Power Sup-
ply Unit
This Unit is used when the I/O power supply is insufficient
or to separate the I/O power supply in the CPU Rack or
Slave Terminal. This Unit must be used when the type of
the I/O power supply for the NX Unit that is used in a CPU
Rack of NX-series CPU Unit is the supply from NX bus.
I/O Power Supply Con-
nection Unit
This Unit is used when the I/O power supply terminals are
insufficient for connections to external I/O devices.
Shield Connection Unit
This Unit is used to ground more than one shield from ex-
ternal I/O connections to the same ground.
Refer to 1-3 Model List on page 1-10
for details on System Unit models.
1 Features and System Configuration
1-3
NX-series System Units User's Manual (W523)
1-1 Features and Types of Sys-
tem Units
1
1-1-2 System Unit Types
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