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Precautions for Safe Use
NX-series Safety Control Unit User’s Manual (Z930)
• Do not write on the Communications Coupler Unit or 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 Slave Terminal.
• For the installation orientations in the following figure, support the cables, e.g., with a duct, so that
the End Plate on the bottom is not subjected to the weight of the cables. The weight of the cables
may cause the bottom End Plate to slide downward so that the Slave Terminal is no longer
secured to the DIN Track, which may result in malfunctions.
• Double-check all switch settings to make sure that they are correct before turning ON the power
supply.
• Use the correct wiring parts and tools when you wire the system.
• Do not bend the cable past its natural bending radius or pull in it with excessive force. Do not
place any heavy objects on the cable. Doing so may severe the cable.
• When wiring or installing the Units, do not allow metal fragments to enter the Units.
• Do not press the flat-blade screwdriver straight into the release hole on the screwless clamping
terminal block. Doing so may break the terminal block.
Wiring
Restricted region
(shaded portion)
Communications Coupler
Unit or NX Unit
NX Unit
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