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CP1E CPU Unit Hardware User’s Manual(W479)
Precautions for Safe Use
Observe the following precautions when using a CP-series PLC.
z Power Supply
• Always use the power supply voltages specified in the user’s manuals. An incorrect voltage may
result in malfunction or burning.
• Take appropriate measures to ensure that the specified power with the rated voltage and fre-
quency is supplied. Be particularly careful in places where the power supply is unstable. An incor-
rect power supply may result in malfunction.
• Double-check all wiring and switch settings before turning ON the power supply. Incorrect wiring
may result in burning.
• Always turn OFF the power supply to the PLC before attempting any of the following. Not turning
OFF the power supply may result in malfunction or electric shock.
• Mounting or dismounting Expansion Units or Expansion I/O Units
• Mounting or dismounting Option Boards
• Setting rotary switches
• Connecting cables or wiring the system
• Connecting or disconnecting the connectors
z Installation
• Before touching a Unit, be sure to first touch a grounded metallic object in order to discharge any
static build-up. Not doing so may result in malfunction or damage.
• Be sure that the terminal blocks, connectors, Option Boards, and other items with locking devices
are properly locked into place. Improper locking may result in malfunction.
z Wiring
• Wire correctly according to specified procedures in this manual.
• Always use the following size wire when connecting I/O terminals: AWG22 to AWG18 (0.32 to
0.82 mm
2
).
• Install external breakers and take other safety measures against short-circuiting in external wiring.
Insufficient safety measures against short-circuiting 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.
• Leave the label attached to the top of the Unit when wiring to prevent the entry of foreign matter.
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 terminals in excess of the rated input voltage. Excess voltages
may result in burning.
• Do not apply voltages or connect loads to the output terminals in excess of the maximum switch-
ing capacity. Excess voltage or loads may result in burning.
• Disconnect the functional ground terminal when performing withstand voltage tests. Not discon-
necting the functional ground terminal may result in burning.
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