Operating Environment Precautions - Omron CJ - 09-2009 Operation Manual

Operating Environment Precautions

!Caution Tighten the screws on the terminal block of the AC Power Supply Unit to the
!Caution A CJ1-H or CJ1M CPU Unit automatically back up the user program and
!Caution When connecting a personal computers or other peripheral devices to a PLC
4 Operating Environment Precautions
!Caution Do not operate the control system in the following locations:
!Caution Take appropriate and sufficient countermeasures when installing systems in
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torque specified in the operation manual. The loose screws may result in
burning or malfunction.
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.
to which a non-insulated Power Supply Unit (CJ1W-PD022) is mounted, either
ground the 0 V side of the external power supply or do not ground the external
power supply at all ground. A short-circuit will occur in the external power sup-
ply if incorrect grounding methods are used. Never ground the 24 V side, as
shown below.
Wiring in Which the 24-V Power Supply Will Short
Non-insulated
DC power supply
24 V
0 V
Power Supply CPU Unit
FG
Unit
• 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.
the following locations:
Peripheral
cable
0 V
Peripheral device (e.g.,
personal computer)
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