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• Connecting or disconnecting any cables or wiring.
Caution Failure to abide by the following precautions could lead to faulty operation of the
PC or the system or could damage the PC or PC Units. Always heed these pre-
cautions.
• Use the Units only with the power supplies and voltages specified in the opera-
tion manuals. Other power supplies and voltages may damage the Units.
• Take measures to stabilize the power supply to conform to the rated supply if it
is not stable.
• Provide circuit breakers and other safety measures to provide protection
against shorts in external wiring.
• Do not apply voltages exceeding the rated input voltage to Input Units.
• Do not apply voltages exceeding the maximum switching capacity to Output
Units.
• Always disconnect the functional ground terminal when performing withstand
voltage tests.
• Carefully follow all of the installation instructions provided in the manuals, in-
cluding the Installation Guide.
• Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
• Locations near to power supply lines.
• Be sure to tighten Backplane screws, terminal screws, and cable connector
screws securely.
• Do not attempt to take any Units apart, to repair any Units, or to modify any
Units in any way.
Caution The following precautions are necessary to ensure the general safety of the sys-
tem. Always heed these precautions.
• Provide double safety mechanisms to handle incorrect signals that can be
generated by broken signal lines or momentary power interruptions.
• Provide external interlock circuits, limit circuits, and other safety circuits in
addition to any provided within the PC to ensure safety.
• Always test the operation of the user program sufficiently before starting actual
system operation.
• Always confirm that there will be no adverse affects on the system before
changing the PC’s operating mode.
• Always confirm that there will be no adverse affects on the system before
force-setting/resetting any bits in PC memory.
• Always confirm that there will be no adverse affects on the system before
changing any set values or present values in PC memory.
• Whenever the CPU Unit has been replaced, be sure that all required memory
data, such as that in the HR and DM areas, has been transferred to the new
CPU Unit before starting operation.
• Never pull on or place objects on cables or cords, or wires may be broken.
Application Precautions
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