Omron DEVICENET#05-2003 Operation Manual page 11

Application Precautions
!Caution The following precautions are necessary to ensure the general safety of the
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• Do not use communications cables or I/O cables in parallel to or close to
high-tension, high-rate current carrying lines. Doing so may cause faulty
operation.
• Be sure to install the MULTIPLE I/O TERMINAL in the proper direction.
Not doing so may cause faulty operation.
• When attaching Units to the DIN track, be sure to attach them securely.
Not doing so may cause the Units to be damaged.
• Use this product within the specified ranges for communications dis-
tances and connection distances. Not doing so may lead to faulty opera-
tion.
• Use the specified cables when making communications connections. Not
doing so may cause faulty operation.
• Be sure to wire the communications paths, the communications power
supplies, the internal power supplies, and the I/O power supplies cor-
rectly. Use voltages for the power supplies that are within the specified
ranges. Not doing so may cause malfunction.
• Do not, under any circumstances, use this product with loads exceeding
the contact rating values. Doing so may cause deterioration of insulation
and damage.
• The life-expectancy of the relays depends greatly on the switching condi-
tions. Before practical use of the product, perform a trial operation of the
product in the actual conditions in which it will be used. Use the product at
a switching frequency that will allow efficient operation. Continued use of
the product in conditions causing reduced efficiency will cause deteriora-
tion of insulation and damage.
• Connection Cables
• Before switching ON power supplies, check that the connectors are
mounted securely.
• Check that the connectors for the I/O Unit interfaces are securely
locked.
• Tightening Torques
Check that all the screws for the Units are tightened to the correct torque.
Not doing so may cause faulty operation.
• Internal power supplies, I/O power supplies, terminal screws:
0.3 to 0.5 N • m
• Communications cable, communications connector screws:
0.25 to 0.35 N • m
• High-density I/O Unit connector screws: 0.25 to 0.35 N • m
• Cleaning
• Do not used thinner-based products for cleaning. Doing so may dis-
solve attachment areas or cause discoloration.
• Power Supply
• Use separate power supplies for communications power supplies, in-
ternal power supplies, I/O power supplies, load power supplies, and
encoder power supplies. Not doing so may lead to faulty operation.
system. 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 System to ensure safety.
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