Omron PRT1-COM Operation Manual page 13

Application Precautions
! Caution
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• 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 rail, 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 distances and
connection distances. Not doing so may lead to faulty operation.
• 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 correctly.
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 conditions.
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 deterioration 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 S m
• Communications cable, communications connector screws:
0.25 to 0.35 N S m
• High-density I/O Unit connector screws: 0.25 to 0.35 N S m
• Cleaning
• Do not used thinner-based products for cleaning. Doing so may dissolve
attachment areas or cause discoloration.
• Power Supply
• Use separate power supplies for communications power supplies, internal
power supplies, I/O power supplies, load power supplies, and encoder
power supplies. Not doing so may lead to faulty operation.
The following precautions are necessary to ensure the general safety of the
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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