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Operating Environment Precautions 4
!Caution A CJ1-H or CJ1M CPU Unit automatically back up the user program and
parameter data to flash memory when these are written to the CPU Unit. I/O
memory (including the DM, EM, and HR Areas), however, is not written to
flash memory. The DM, EM, and HR Areas can be held during power interrup-
tions with a battery. If there is a battery error, the contents of these areas may
not be accurate after a power interruption. If the contents of the DM, EM, and
HR Areas are used to control external outputs, prevent inappropriate outputs
from being made whenever the Battery Error Flag (A40204) is ON. Areas
such as the DM, EM, and HR Areas, the contents of which can be held during
power interrupts, is backed up by a battery. If a battery error occurs, the con-
tents of the areas that are set to be held may not be accurate even though a
memory error will not occur to stop operation. If necessary for the safety of the
system, take appropriate measures in the ladder program whenever the Bat-
tery Error Flag (A40204) turns ON, such as resetting the data in these areas.
4 Operating Environment Precautions
!Caution Do not operate the control system in the following locations:
• Locations subject to direct sunlight.
• Locations subject to temperatures or humidity outside the range specified
in the specifications.
• Locations subject to condensation as the result of severe changes in tem-
perature.
• Locations subject to corrosive or flammable gases.
• Locations subject to dust (especially iron dust) or salts.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to shock or vibration.
!Caution Take appropriate and sufficient countermeasures when installing systems in
the following locations:
• Locations subject to static electricity or other forms of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radioactivity.
• Locations close to power supplies.
!Caution The operating environment of the PLC System can have a large effect on the
longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Be sure that the operating environment is within the specified condi-
tions at installation and remains within the specified conditions during the life
of the system.
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