Operating Environment Precautions - Omron CS1W-CRM21 Operation Manual

Operating Environment Precautions

!WARNING
!Caution Execute online editing only after confirming that no adverse effects will be
!Caution Confirm safety at the destination node before changing or transferring to
4 Operating Environment Precautions
!Caution Do not operate the control system in the following locations:
!Caution The operating environment of the PLC System can have a large effect on the
Provide safety measures in external circuits (i.e., not in the Programmable
Controller), including the following items, to ensure safety in the system if an
abnormality occurs due to malfunction of the PLC or another external factor
affecting the PLC operation. ("PLC" includes CPU Units, other Units mounted
in the PLC, and Remote I/O Terminals) Not doing so may result in serious
accidents.
• Emergency stop circuits, interlock circuits, limit circuits, and similar safety
measures must be provided in external control circuits.
• The PLC will turn OFF all outputs when its self-diagnosis function detects
any error or when a severe failure alarm (FALS) instruction is executed.
As a countermeasure for such errors, external safety measures must be
provided to ensure safety in the system.
• The PLC outputs may remain ON or OFF due to deposits on 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-V DC output (service power supply) 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.
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
another node the contents of a program, the PLC Setup, I/O tables, or I/O
memory. Changing or transferring any of these without confirming safety may
result in unexpected equipment operation.
• 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, of chemicals (including acids).
• Locations subject to shock or vibration.
longevity and reliability of the system. Improper operating environments can
lead to malfunction, failure, and other unforeseeable problems with the PLC
System. Make sure that the operating environment is within the specified con-
ditions at installation and remains within the specified conditions during the
life of the system.
4
xvii