Application Precautions - Omron CJ - INSTRUCTIONS REFERENCE MANUAL 07-2009 Reference Manual

PRECAUTIONS
Operating Environment Precautions
!Caution Do not operate the control system in the following locations:
!Caution Take appropriate and sufficient countermeasures when installing systems in
!Caution The operating environment of the PLC System can have a large effect on the

Application Precautions

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• Locations subject to direct sunlight.
• Locations subject to temperatures or humidity outside the range specified
in the specifications.
• Locations subject to condensation as the result of severe changes in tem-
perature.
• Locations subject to corrosive or flammable gases.
• Locations subject to dust (especially iron dust) or salts.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to shock or vibration.
the following locations:
• Locations subject to static electricity or other forms of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radioactivity.
• Locations close to power supplies.
longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified condi-
tions at installation and remains within the specified conditions during the life
of the system.
Observe the following precautions when using a CJ-series PLC.
■ Power Supply
• Always use the power supply voltages specified in the operation manuals.
An incorrect voltage may result in malfunction or burning.
• Design the system so that the power supply capacity of the Power Supply
Unit that you are using is not exceeded. Exceeding the capacity of the
Power Supply Unit may prevent the CPU Unit or other Units from starting.
• Take appropriate measures to ensure that the specified power with the
rated voltage and frequency is supplied. Be particularly careful in places
where the power supply is unstable. An incorrect power supply may result
in malfunction.
• 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, In-
ner Boards, or any other Units.
• Assembling the Units.
• Setting DIP switches or rotary switches.
• Connecting cables or wiring the system.
• Connecting or disconnecting the connectors.
• When cross-wiring terminals, the total current for all the terminal will flow
in the wire. Make sure that the current capacity of the wire is sufficient.
CS/CJ/NSJ Series Instructions Reference Manual (W474)