Omron CJ-Series Operation Manual page 12

Safety Precautions
!WARNING
!Caution Confirm safety before transferring data files stored in the file memory (Mem-
!Caution Fail-safe measures must be taken by the customer to ensure safety in the
!Caution Interlock circuits, limit circuits, and similar safety measures in external circuits
!Caution Execute online edit only after confirming that no adverse effects will be
!Caution Confirm safety at the destination node before transferring a program to
!Caution Tighten the screws on the terminal block of the AC Power Supply Unit to 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. 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 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-V DC output (service power supply to the PLC) is over-
loaded 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.
ory Card or EM file memory) to the I/O area (CIO) of the CPU Unit using a
peripheral tool. Otherwise, the devices connected to the output unit may mal-
function regardless of the operating mode of the CPU Unit.
event of incorrect, missing, or abnormal signals caused by broken signal lines,
momentary power interruptions, or other causes.
(i.e., not in the Programmable Controller) must be provided by the customer.
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
another node or changing contents of the I/O memory area. Doing either of
these without confirming safety may result in injury.
torque specified in the operation manual. The loose screws may result in
burning or malfunction.
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