Omron CJ2 User Manual page 29

• Make sure that the required data for the DM Area, Holding Area, and other memory areas has
been transferred to a CPU Unit that has been replaced 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 mal-
function, fire, or electric shock.
• Do not drop the PLC or subject abnormal vibration or shock to it.
• When replacing parts, be sure to confirm that the rating of a new part is correct. Not doing so may
result in malfunction or burning.
• When transporting or storing Units or Board, static electricity can destroy LSIs or ICs. Cover the
PCBs with a conductive material and maintain the specified storage temperature.
• Do not touch circuit boards or the components mounted to them with your bare hands. There are
sharp leads and other parts on the boards that may cause injury if handled improperly.
• The life of the battery will be reduced if a CPU Unit 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.
• 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 incinerate the battery. Do not
subject the battery to strong shocks. Doing any of these may result in leakage, rupture, heat gen-
eration, or ignition of the battery. Dispose of any battery that has been dropped on the floor or oth-
erwise subjected to excessive shock. Batteries that have been subjected to shock may leak if they
are used.
• UL standards require that only an experienced engineer can replace the battery.
Make sure that an experienced engineer is in charge of battery replacement. Follow
the procedure for battery replacement given in this manual.
• Unexpected operation may result if inappropriate data link tables or parameters are set. Even if
appropriate data link tables and parameters have been set, confirm that the controlled system will
not be adversely affected before starting or stopping data links.
• CPU Bus Units will be restarted when routing tables are transferred from a Programming Device
to the CPU Unit. Restarting these Units is required to read and enable the new routing tables.
Confirm that the system will not be adversely affected before allowing the CPU Bus Units to be
reset.
• When creating an AUTOEXEC.IOM file from a Programming Device (a Programming Console
or the CX-Programmer) to automatically transfer data at startup, set the first write address to
D20000 and be sure that the size of data written does not exceed the size of the DM Area.
When the data file is read from the Memory Card at startup, data will be written in the CPU
Unit starting at D20000 even if another address was set when the AUTOEXEC.IOM file was
created. Also, if the DM Area is exceeded (which is possible when the CX-Programmer is
used), the remaining data will be written to the EM Area.
• A battery is mounted to a CJ-series CPU Unit when the Unit is shipped from the factory. Also, the
time is set on the internal clock. It is thus not necessary to clear memory and set the clock before
using a CJ-series CPU Unit. This point differs from the CS-series CS1 CPU Units.
CJ2 CPU Unit Hardware User's Manual 23