Application Precautions - Omron CJ1W-C113 - REV 02-2008 Operation Manual

Application Precautions

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Application Precautions

!WARNING
!Caution Failure to abide by the following precautions may lead to faulty operation of
Observe the following precautions when using the PCU or the PLC.
Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• 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.
• 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 Power Supply Units, I/O Units, CPU Units,
Memory Cassettes, or any other Units.
• Assembling the Units.
• Setting DIP switches or rotary switches.
• Connecting cables or wiring the system.
• Connecting or disconnecting the connectors.
the PLC, the PCU. or the system, or could damage the PLC or PCU. Always
heed these precautions.
• Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal
lines, momentary power interruptions, or other causes.
• Interlock circuits, limit circuits, and similar safety measures in external cir-
cuits (i.e., not in the Programmable Controller) must be provided by the
customer.
• Install external breakers and take other safety measures against short-cir-
cuiting in external wiring. Insufficient safety measures against short-cir-
cuiting may result in burning.
• Install the PLC Unit as far as possible from sources of strong harmonic
noise.
• Lock the sliders securely until the click into place when connecting the
Power Supply Unit, CPU Unit, I/O Units, Special I/O Units, or CPU Bus
Units. Functions may not work correctly if the sliders are not locked prop-
erly.
• Always attach the End Cover provided with the CPU Unit to the Unit on
the right end of the PLC. The CJ-series PLC will not operate properly if
the End Cover is not attached.
• Be sure that the external I/O connector lock screws are tightened to the
torque specified in the relevant manuals. Incorrect tightening torque may
result in malfunction.
• Always use the power supply voltages specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.
• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied in places where the power supply
is unstable. An incorrect power supply may result in malfunction.
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