Safety Precautions
14
NX-series Communications Interface Units User’s Manual (W540)
Voltage and Current Inputs
Make sure that the voltages and currents that are input to the Units and slaves are within
the specified ranges.
Inputting voltages or currents that are outside of the specified ranges may cause accidents
or fire.
Transferring
Always confirm safety at the destination node before you transfer Unit configuration infor-
mation, parameters, settings, or other data from tool
s such as the Sysmac Studio.
The devices or machines may operate unexpectedly, rega
rdless of the operating mode of
the Controller.
Cautions
Wiring
When you connect a computer or other peripheral device to a Communications Coupler
Unit or Communications Interface Unit that has a non-isolated DC power supply, either
ground the 0-V side of the external power supply (i.e. Unit power supply) or do not ground it
at all.
If the peripheral devices are grounded incorrectly, the
externa
l power supply (i.e. Unit
power supply) may be short-circuited.
Never ground the 24-V side of the power supply, as
shown in the following figure.
Tighten cable screws to the specif
ied torque. Loose screws may result in fire or malfunc-
tion. Ask the cable manufacturer for the spec
ified torque for the screws.
Peripheral device
(e.g., computer)
Non-isolated DC
power supply
(internal power
supply circuit)
0 V
Peripheral
device cable
Communications Coupler Unit
NX Unit
power supply
Unit power
supply
Ground terminal
24 V
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