Precautions for Safe Use
• Always turn OFF the power supply before installing the Unit. If the power supply is not OFF,
the Unit may malfunction or may be damaged.
• Do not apply labels or tape to the Unit. When the Unit is installed or removed, adhesive or
scraps may adhere to the pins in the NX bus connector
, which may result in malfunctions.
• Do not touch the pins in the NX bus connector on the Unit. Dirt may adhere to the pins in the
NX bus connector, which may result in malfunctions.
Example: NX Unit (12 mm width)
N
G NG
• Do not write on an NX Unit with ink within the restricted region that is shown in the following
figure. Also do not get this area dirty. When the Unit is installed or removed, ink or dirt may
adhere to the pins in the NX bus connector
, which may result in malfunctions in the CPU
Rack or the Slave Terminal.
Refer to the user’s manual for the connected CPU Unit, Communications Coupler Unit, or
Communication Control Unit for details on the restricted region on the CPU Unit, Communica-
tions Coupler Unit, or Communication Control Unit.
Restricted
region (shaded
portion)
Precautions for Correct Use
• When you install an NX Unit, do not touch or bump the pins in the NX bus connector.
• When you handle an NX Unit, be careful not to apply any stress to the pins in the NX bus
connector
. If the NX Unit is installed and the power supply is turned ON when the pins in the
NX bus connector are deformed, contact failure may cause malfunctions.
1 From the front of the previously mounted NX Unit, engage the Unit hookup guides on a new
Unit with the Unit hookup guides on the previously mounted NX Unit.
4 Installation and Wiring
4-3
NX-series System Units User's Manual (W523)
4-1 Installing NX Units
4
4-1-1 Installing NX Units
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