17
Precautions for Safe Use
NX-series Communications Interface Units User’s Manual (W540)
• 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 Termi-
nal.
Refer to the user’s manual for the connected CPU Unit
or Communic
ations Coupler Unit for the
restricted region of CPU Unit and Communications Coupler Unit.
• 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 switches and other settings and dou
b
le-check all wiring 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.
• Observe the following precautions when you wire communications cables. The communications
cables may be
broken or the Units may malfunction.
a) Do not fold communications cables.
b) Do not pull on communications cables with excess
ive force. Secure communications cables so
that they are not pulled on excessively.
c) Do not place heavy objects on top of
communications cables.
For a terminal block, cable ties can be used to secure the communications cable.
• When wiring or installing the Units, do not allow metal fragments to enter the Unit
s.
Wiring
Restricted
region (shaded
portion)
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