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Application Precautions 5
5 Application Precautions
Observe the following precautions when using the DeviceNet Smart Slave.
• Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal
lines, momentary power interruptions, or other causes.
• Provide external interlock circuits, limit circuits, and other safety circuits in
addition to any provided within the PLC to ensure safety.
• Mount the Unit to a DIN Track or mount it with screws.
• If the system is installed at a site with poor power supply conditions, take
appropriate measures to ensure that the power supply remains within the
rated voltage and frequency specifications.
• Provide circuit breakers and other safety measures to provide protection
against shorts in external wiring.
• Always ground the system to 100
Ω or less when installing the system to
protect against electrical shock.
• Always turn OFF the communications power supply and the power sup-
plies to the PLC and Slaves before attempting any of the following.
• Mounting or removing a Unit such as an I/O Unit, CPU Unit, Memory
Cassette, or Master Unit.
• Mounting or removing Remote I/O Terminal circuit sections.
• Assembling any devices or racks.
• Setting rotary switches.
• Connecting or wiring cables.
• Connecting or disconnecting connectors.
• Do not attempt to disassemble, repair, or modify any Units.
• Be sure that all the terminal screws are tightened to the torque specified
in the relevant manuals. Loose screws may cause fire, malfunction, or
damage the Unit.
• Be sure that all the mounting screws and cable connector screws are
tightened to the torque specified in the relevant manuals.
• Do not remove the label from a Unit before wiring. Always remove the
label after completing wiring, however, to ensure proper heat dispersion.
• Use crimp terminals for wiring. Do not connect bare stranded wires
directly to terminals.
• Double-check all switch settings and wiring before turning ON the power
supply.
• Always follow the electrical specifications for terminal polarity, communi-
cations path wiring, power supply wiring, and I/O jumpers. Incorrect wiring
can cause failures.
• Be sure to wire the Unit correctly.
• Be sure to wire terminals with the correct polarity.
• Be sure that the communications cable connectors and other items with
locking devices are properly locked into place.
• Do not drop the Unit or subject the Unit to excessive vibration or shock.
Doing so may cause malfunction or damage to the Unit.
• Use the special packing box when transporting the Unit. Ensure that the
product is handled carefully so that no excessive vibration or impact is
applied to the product during transportation.
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