4 Installation and Wiring
4 - 2
NX-series Digital I/O Unit User’s Manual (W521)
4-1 Installing NX Units
This section describes how to install NX Units.
Refer to the user's manual of the Communications Coupler Unit for information on preparations of
installation and installation in a control panel.
This section describes how to mount two NX Units to each other.
Always turn OFF the power supply before you mount NX Units.
Always mount NX Units one at a time. If you attempt to mount multiple NX Units that are already con-
nected together, the connections between the NX Units may separate from each other and fall.
Precautions for Correct Use
• Do not apply labels or tape on the NX Units. When the Unit is installed or removed, adhesive
or scrap may adhere to the pins of the NX bus connector, which may cause malfunctions.
• Do not write with ink or soil within the prohibited region that is shown in the following figure.
When the Unit is installed or removed, ink or dirt may adhere to the pins of the NX bus con-
nector, which may cause malfunctions in the Slave Terminal.
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 you install an NX Unit and turns ON the power supply when the pins in the NX
bus connector are deformed, a contact defect may cause malfunctions.
4-1-1 Installing NX Units
Prohibited region
(shaded portion)
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