Application Precautions - Omron CQM1-ARM21 Operation Manual

Application Precautions

!
Caution
5

Application Precautions

! WARNING
!
Caution
• Where there is any corrosive or inflammable gas.
• Where there is excessive dust, saline air, or metal powder.
• Where the PLC is affected by vibration or shock.
• Where any water, oil, or chemical may splash on the PLC.
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
conditions at installation and remains within the specified conditions during
the life of the system.
Observe the following precautions when using the AS-Interface Master Units
or the PLC.
Failure to abide by the following precautions could lead to serious or possibly
fatal injury. Always heed these precautions.
• Always ground the system to 100 Ω or less when installing the system to
protect against electrical shock.
• Always turn OFF the power supply to the PLC before attempting any of the
following. Performing any of the following with the power supply turned ON
may lead to electrical shock:
• Mounting or removing any Units (e.g., I/O Units, CPU Unit, etc.) or
memory cassettes.
• Assembling any devices or racks.
• Connecting or disconnecting any cables or wiring.
Failure to abide by the following precautions could lead to faulty operation of
the PLC or the system or could damage the PLC or PLC Units. Always heed
these precautions.
• Use the Units only with the power supplies and voltages specified in the
operation manuals. Other power supplies and voltages may damage the
Units.
• Take measures to stabilise the power supply to conform to the rated supply
if it is not stable.
• Provide circuit breakers and other safety measures to provide protection
against shorts in external wiring.
• Do not apply voltages exceeding the rated input voltage to Input Units. The
Input Units may be destroyed.
• Do not apply voltages exceeding the maximum switching capacity to Output
Units. The Output Units may be destroyed.
• Always disconnect the LG terminal when performing withstand voltage
tests.
• Install all Units according to instructions in the operation manuals. Improper
installation may cause faulty operation.
• Provide proper shielding when installing in the following locations:
• Locations subject to static electricity or other sources of noise.
• Locations subject to strong electromagnetic fields.
• Locations subject to possible exposure to radiation.
• Locations near power supply lines.
Section 5
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