Omron CJ - REFERENCE MANUAL 02-2010 Reference Manual page 32

PRECAUTIONS
xxxiv
• Do not apply voltages or connect loads to the Output Units in excess of
the maximum switching capacity. Excess voltage or loads may result in
burning.
• Do not pull on the cables or bend the cables beyond their natural limit.
Doing either of these may break the cables.
• Do not place objects on top of the cables or other wiring lines. Doing so
may break the cables.
• Do not use commercially available RS-232C personal computer cables.
Always use the special cables listed in this manual or make cables
according to manual specifications. Using commercially available cables
may damage the external devices or CPU Unit.
• Never connect pin 6 (5-V power supply) on the RS-232C port on the CPU
Unit to any device other than an NT-AL001 or CJ1W-CIF11 Adapter. The
external device or the CPU Unit may be damaged.
■ Handling
• The Power Supply Unit may possibly be damaged if the entire voltage for
a dielectric strength test is applied or shut OFF suddenly using a switch.
Use a variable resistor to gradually increase and decrease the voltage.
• Separate the line ground terminal (LG) from the functional ground termi-
nal (GR) on the Power Supply Unit before performing withstand voltage
tests or insulation resistance tests. Not doing so may result in burning.
• Make sure that the DIP switches and DM Area are set correctly before
starting operation.
• After replacing the CPU Unit, a Special I/O Unit, or a CPU Bus Unit, make
sure that the required data for the DM Area, Holding Area, and other
memory areas has been transferred to the new Unit before restarting
operation.
• 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.
• Do not attempt to disassemble, repair, or modify any Units. Any attempt to
do so may result in malfunction, fire, or electric shock.
• Do not drop the PLC or subject abnormal vibration or shock to it.
• The life of the battery will be reduced if the PLC is left for a period of time
without a battery installed and without power supply, and then a battery is
installed without turning ON the power supply.
• Replace the battery as soon as a battery error occurs or as soon as the
specified battery backup time expires. Be sure to install a replacement
battery within two years of the production date shown on the battery's
label.
• Before replacing the battery, turn ON power for at least 5 minutes before
starting the replacement procedure and complete replacing the battery
within 5 minutes of turning OFF the power supply. Memory contents may
be corrupted if this precaution is not obeyed.
• If the Battery Error Flag is used in programming the application, confirm
system safety even if the system detects a battery error before you
replace the battery while the power is ON.
• Do not short the battery terminals or charge, disassemble, heat, or incin-
erate the battery. Do not subject the battery to strong shocks. Doing any
of these may result in leakage, rupture, heat generation, or ignition of the
battery. Dispose of any battery that has been dropped on the floor or oth-
CS/CJ/NSJ Series Instructions Reference Manual (W474)