Operating Environment Precautions - Omron GRT1-PNT - DATASHEET 2 Operation Manual

Operating environment precautions

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Operating environment precautions

WARNING
The CPU Unit refreshes I/O even when the program is stopped (i.e., even in
PROGRAM mode). Confirm safety thoroughly in advance before changing the status of
any part of memory allocated to Output Units, Special I/O Units, or CPU Bus Units. Any
changes to the data allocated to any Unit may result in unexpected operation of the
loads connected to the Unit. Any of the following operations may result in changes to
memory status.
• Transferring I/O memory data to the CPU Unit from a Programming Device.
• Changing present values in memory from a Programming Device.
• Force-setting/force-resetting bits from a Programming Device.
• Transferring I/O memory files from a Memory Card or EM file memory to the CPU
Unit.
• Transferring I/O memory from a host computer or from another PLC on a network.
WARNING
Never attempt to disassemble any Units or touch the terminal block while power is
being supplied. Doing so may result in serious electrical shock or electrocution.
Caution
Do not operate the control system in the following locations:
• Locations subject to direct sunlight.
• Locations subject to temperatures or humidities outside the range specified in the
specifications.
• Locations subject to condensation as the result of severe changes in temperature.
• 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.
Provide proper shielding when installing the Unit in the following locations:
• Locations subject to static electricity or other forms of electric 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 Unit can have a large effect on the longevity and
reliability of the system. Unsuitable operating environments can lead to malfunction,
failure and other unforeseeable problems with the system. Ensure that the operating
environment is within the specified conditions at installation and remains within the
specified conditions during the life of the system. Follow all installation instructions and
precautions provided in the operation manuals.
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