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Application Precautions 5
• Connecting or disconnecting the connectors
• Before touching the Unit, be sure to first touch a grounded metallic object
in order to discharge any static built-up. Not doing so may result in mal-
function or damage.
• Confirm that no adverse effect will occur in the system before attempting
any of the following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PLC. (including the Startup Mode
setting)
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• When replacing parts, be sure to confirm that the rating of a new part is
correct. Not doing so may result in malfunction or burning.
• Resume operation only after transferring to the new CPU Unit and/or Spe-
cial I/O Units the contents of the DM and HR Areas required for resuming
operation. Not doing so may result in an unexpected operation.
• When transporting the Units, use special packing boxes and protect them
from excessive vibration or shock during transportation.
• Connect all communications cables within the limits given in the specifica-
tions.
• Observe the following precautions when wiring communications cables.
• Separate the communications cables from power lines or high-tension
lines.
• Do not bend the communications cables.
• Do not pull on the communications cables with an excessive force.
• Do not place heavy objects on the communications cables.
• Be sure to put the communications cables inside conduits.
• Water-resistant Terminals used as Slaves are of IP67 construction. Do not
attempt to use the Watertight Terminals for applications where the Water-
tight Terminals are always underwater.
• Install the Unit properly as specified in the operation manual. Improper
installation of the Unit may result in malfunction.
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