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such problems, external safety measures must be provided to ensure safety in
the system.
• When the 24-VDC output (service power supply to the PC) is overloaded or
short-circuited, the voltage may drop and result in the outputs being turned
OFF. As a countermeasure for such problems, external safety measures must
be provided to ensure safety in the system.
Caution Execute online edit only after confirming that no adverse effects will be caused
by extending the cycle time. Otherwise, the input signals may not be readable.
Caution Confirm safety at the destination node before transferring a program to another
node or changing contents of the I/O memory area. Doing either of these without
confirming safety may result in injury.
Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the
torque specified in the operation manual. The loose screws may result in burning
or malfunction.
4 Operating Environment Precautions
Do not operate the control system in the following places.
• Where the PC is exposed to direct sunlight.
• Where the ambient temperature is below 0°C or over 55°C.
• Where the PC may be affected by condensation due to radical temperature
changes.
• Where the ambient humidity is below 10% or over 90%.
• Where there is any corrosive or inflammable gas.
• Where there is excessive dust, saline air, or metal powder.
• Where the PC is affected by vibration or shock.
• Where any water, oil, or chemical may splash on the PC.
Caution The operating environment of the PC System can have a large effect on the lon-
gevity and reliability of the system. Improper operating environments can lead to
malfunction, failure, and other unforeseeable problems with the PC System. Be
sure that the operating environment is within the specified conditions at installa-
tion and remains within the specified conditions during the life of the system.
5 Application Precautions
Observe the following precautions when using the PC.
WARNING Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always ground the system to 100 Ω or less when installing the system to pro-
tect against electrical shock.
• Always turn OFF the power supply to the PC before attempting any of the fol-
lowing. Performing any of the following with the power supply turned ON may
lead to electrical shock:
• Mounting or removing any Units (e.g., I/O Units, CPU Unit, etc.) or memory
cassettes.
• Assembling any devices or racks.
Application Precautions
5