Omron NX701-1620, User Manual

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15
Safety Precautions
NX-series CPU Unit Hardware User’s Manual (W535)
Cautions
Caution
Application
Do not touch any Unit when power is being supplied or immediately after the
power supply is turned OFF. Doing so may result in burn injury.
Wiring
Be sure that all terminal screws and cable connector screws are tightened to
the torque specified in the relevant manuals. The loose screws may result in
fire or malfunction.
When you connect a computer or other peripheral device to a Controller that
has a non-isolated DC Power Supply Unit, either ground the 0-V side of the
external power supply or do not ground it at all.
If the peripheral devices are grounded incorrectly, the external power supply
may be short-circuited. Never ground the 24-V side of the power supply, as
shown in the following figure.
Online Editing
Execute online editing only after confirming that no adverse effects will be
caused by deviations in the timing of I/O. If you perform online editing, the
task execution time may exceed the task period, I/O may not be refreshed
with external devices, input signals may not be read, and output timing may
change.
Peripheral device
(e.g., computer)
Non-isolated DC power supply
(internal power supply circuit)
0 V
Peripheral
device cable
External
power supply
24 V