Application Precautions - Omron CJ - 12-2004 Manual

Application Precautions

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Application Precautions

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Observe the following precautions when using the ID Sensor Unit or the PLC.
Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always turn OFF the power supply to the PLC before attempting any of
the following. Performing any of the following with the power supply turned
ON may lead to electrical shock:
• Mounting or removing any Units (e.g., Power Supply Unit, I/O Units,
CPU Unit, etc.) or Memory Cassettes.
• Assembling any devices or racks.
• Setting DIP switches or rotary switches.
• Connecting or disconnecting any cables or wiring.
Failure to abide by the following precautions could lead to faulty operation of
the PLC or the system or could damage the PLC or PLC Units. Always heed
these precautions.
• Fail-safe measures must be taken by the customer to ensure safety in the
event that outputs from Output Units remain ON as a result of internal cir-
cuit failures, which can occur in relays, transistors, and other elements.
• 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.
• 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.
• Do not apply voltages to the Input Units in excess of the rated input volt-
age. Excess voltages may result in burning.
• 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.
• Install the Units properly as specified in the operation manuals. Improper
installation of the Units may result in malfunction.
• Be sure that all the mounting screws, terminal screws, and cable connec-
tor screws are tightened to the torque specified in the relevant manuals.
Incorrect tightening torque may result in malfunction.
• Do not attempt to take any Units apart, to repair any Units, or to modify
any Units in any way.
• Check switch settings, the contents of the DM Area, and other prepara-
tions before starting operation. Starting operation without the proper set-
tings or data may result in an unexpected operation.
• 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 dis-
sipation. Leaving the label attached may result in malfunction.
!WARNING
!CAUTION
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