Omron CQM1H-CLK21 - Manual (Page 22)

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Applications Precautions 5
• Double-check all wiring and switch settings before turning ON the power
supply. Incorrect wiring may result in burning.
• Wire all connections correctly.
• Mount Units only after checking terminal blocks completely.
• Be sure that the Bus Connection Units and other items with locking
devices are properly locked into place. Improper locking may result in
malfunction.
• Use special packing box when transporting the Controller Link Unit. Han-
dle the product carefully so that no excessive vibration or impact is
applied to the product during transportation.
• Check the user program for proper execution before actually running it on
the Unit. Not checking the program may result in an unexpected opera-
tion.
• 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 setting of the
startup operating mode)
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Inappropriate settings in data link tables or routing tables can cause unex-
pected system operation. Always check table settings before starting
operation, and always test the settings in trial operation before starting or
stopping the data links in actual operation.
• CPU Bus Units will be automatically restarted when routing tables are
transferred from a Programming Device to the CPU Unit. Resetting is
required to use the new tables. Confirm that restarting the CPU Bus Units
will not adversely affect system operation before transferring routing
tables.
• Observe the following precautions when wiring the communications
cables.
• Separate the cables from the power lines or high-tension lines.
• Do not bend the cables.
• Do not pull on the cables.
• Do not place heavy objects on top of the cables.
• Route cables inside conduits.
• Before touching the Unit, be sure to first touch a grounded metallic object
in order to discharge any static build-up.