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CJ2 CPU Unit Hardware User’s Manual
• Be sure that the connectors, terminal blocks, expansion cables, and other items with locking
devices are properly locked into place. Improper locking may result in malfunction.
• The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit, I/O Units, Special I/O
Units, and CPU Bus Units must be completely locked (until they click into place) after connecting
to adjacent Units. The Unit may not operate properly if the sliders are not locked in place. It may
not be possible to achieve proper functionality if the sliders are not locked.
• Always attach the End Cover that comes with the CPU Unit to the right end of the CPU Rack. The
PLC will not operate correctly if the End Cover is not attached.
z Wiring
• Wire all connections correctly.
• Double-check all wiring and switch settings before turning ON the power supply. Incorrect wiring
may result in burning.
• Be sure that all terminal screws, and cable connector screws are tightened to the torque specified
in the relevant manuals. Incorrect tightening torque may result in malfunction.
• Do not apply a force exceeding 100 N to the terminal block when tightening it.
• Mount Units only after checking terminal blocks and connectors completely.
• Leave the label attached to the Unit when wiring. Removing the label may result in malfunction if
foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dissipation. Leaving the
label attached may result in malfunction.
• Use crimp terminals for wiring. Do not connect bare stranded wires directly to terminals. Connec-
tion of bare stranded wires may result in burning.
• Do not apply voltages to the Input Units in excess of the rated input voltage. Excess voltages may
result in burning.
• Always connect to a ground of 100 Ω or less when installing the Units. Not connecting to a ground
of 100 Ω or less may result in electric shock.
• A ground of 100 Ω or less must be installed when shorting the GR and LG terminals on the Power
Supply Unit.
• Fail-safe measures must be taken by the customer to ensure safety in the event of incorrect, miss-
ing, or abnormal signals caused by broken signal lines, momentary power interruptions, or other
causes.
• Do not apply voltages or connect loads to the Output Units in excess of the maximum switching
capacity. Excess voltage or loads may result in burning.
• Do not pull on the cables or bend the cables beyond their natural limit. Doing either of these may
break the cables.
• Do not place objects on top of the cables or other wiring lines. Doing so may break the cables.
• Do not use commercially available RS-232C personal computer cables. Always use the special
cables listed in this manual or make cables according to manual specifications. Using commer-
cially available cables may damage the external devices or CPU Unit.
• Never connect pin 6 (5-V power supply) on the RS-232C port on the CPU Unit to any device other
than an NT-AL001 or CJ1W-CIF11 Adapter. The external device or the CPU Unit may be dam-
aged.
z Handling
• The Power Supply Unit may possibly be damaged if the entire voltage for a dielectric strength test
is applied or shut OFF suddenly using a switch. Use a variable resistor to gradually increase and
decrease the voltage.
• Separate the line ground terminal (LG) from the functional ground terminal (GR) on the Power
Supply Unit before performing withstand voltage tests or insulation resistance tests. Not doing so
may result in burning.
• Make sure that the DIP switches and DM Area are set correctly before starting operation.
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