Omron CS1W-SLK11-21 - 06-2004, Manual

Page: 14 / 202

xv
Operating Environment Precautions 4
• The PLC outputs may remain ON or OFF due to deposition or burning of
the output relays or destruction of the output transistors. As a counter-
measure for such problems, external safety measures must be provided
to ensure safety in the system.
• When the 24-VDC output (service power supply to the PLC) is overloaded
or short-circuited, the voltage may drop and result in the outputs being
turned OFF. As a countermeasure for such problems, external safety
measures must be provided to ensure safety in the system.
!Caution Confirm safety at the destination node before transferring a program to
another node or changing the I/O memory area. Doing either of these without
confirming safety may result in injury.
4 Operating Environment Precautions
!Caution
Do not operate the control system in the following places:
• 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.
5 Application Precautions
Observe the following precautions when using the SYSMAC LINK Unit.
!WARNING
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 or the backup power supply to the PLC
or the computer before attempting any of the following. Performing any of
the following with the power supply turned ON may lead to electrical
shock:
• Installing or removing the SYSMAC LINK Unit.
• Mounting or dismounting Power Supply Units, I/O Units, CPU Units, In-
ner Boards, or any other Units.
• Assembling the Units.
• Setting DIP or rotary switches.