Omron CS1W-MCH71 Operation Manual page 42

Safety Precautions
3 Safety Precautions
Never attempt to disassemble any Units while power is being supplied.
Doing so may result in serious electronic shock.
Never touch any of the terminals while power is being supplied.
Doing so may result in serious electronic shock.
Provide safety measures in external circuits (i.e., not in the Programmable Controller or MC Unit) to ensure
safety in the system if an abnormality occurs due to malfunction of the PLC or MC unit. Not providing suffi-
cient safety measures may result in serious accidents.
• Emergency- stop circuits, interlock circuits, limit circuits, and similar safety measures must be provided in external con-
trol 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 or MC Unit outputs may remain ON or OFF due to deposits on or burning of the output relays, or destruction of
the output transistors. As a countermeasure for such problems, external safety measures must be provided to ensure
safety in the system.
• When the 24-VDC (service power supply to the PLC) is overloaded or short-circuited, the voltage may drop 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.
• Provide safety measures in external circuits to ensure safety in system if an abnormality occurs due to malfunction of MC
Unit connectors.
Execute online edit only after confirming that the cycle time extension will not cause any adverse effects.
Some input signals may not be read if the cycle time is extended.
Confirm the safety of the destination node before transferring program to the node or changing the contents
of I/O memory. Doing either of these without confirming safety may result in injury.
Do not save data into the flash memory during memory operation or while the motor is running. Otherwise,
unexpected operation may be caused.
Do not reverse the polarity of the 24-V power supply. The polarity must be correct. Otherwise, the motor may
start running unexpectedly and may not stop.
When positioning is performed using Teaching function, positioning specification in the motion program must
be [Absolute specification].
If [Incremental specification] is specified, positioning will be executed at the different point from where
Teaching conducted.
DANGER
WARNING
3
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