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Application Precautions 5
4-3 Precautions for All Loop Control Boards, Process-control CPU
Units, and Loop-control CPU Units
!Caution Do not operate the control system in the following places:
• Locations subject to direct sunlight
• Locations subject to temperature 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
!Caution Take appropriate and sufficient countermeasures when installing systems in
the following locations:
• Locations subject to static electricity or other forms of noise
• Locations subject to strong electromagnetic fields
• Locations subject possible exposure to radioactivity
• Locations close to power supplies
!Caution The operating environment of the PLC System can have a large effect on the
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.
5 Application Precautions
Observe the following precautions when using the PLC.
!WARNING Always heed these precautions. Failure to abide by the following precautions
could lead to serious or possibly fatal injury.
• Always turn OFF the power to the PLC before attempting any of the fol-
lowing. Not turning OFF the power may result in malfunction or electric
shock.
• Mounting or dismounting I/O Units, including Inner Boards
• Assembling the Racks
• Setting DIP switches or unit number setting switches
• Connecting or wiring the cables
• Connecting or disconnecting the connectors
!Caution 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.
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