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7 Wiring
NX-series EtherCAT Coupler Unit User’s Manual (W519)
7-2 Connecting the Power Supply and Ground Wires
7
7-2-4 Precautions for Wiring the EtherCAT Slave Terminal
Together with Computers and other Peripheral Devices
7-2-4 Precautions for Wiring the EtherCAT Slave Terminal Together
with Computers and other Peripheral Devices
Caution
When you connect a computer or other peripheral device to the following Unit, either ground the 0-V
side of the external power supply (i.e. Unit power supply) or do not ground it at all.
• EtherCAT Coupler Unit with a non-isolated DC power supply (internal power supply cir-
cuits)
Depending on how the peripheral device is grounded, the external power supply (i.e. Unit power sup-
ply) may be shorted. Never ground the 24-V side of the power supply, as shown in the following fig-
ure.
Grounding That Causes a 24-V Power Supply to Short
EtherCAT Coupler Unit
NX Unit power supply
Non-isolated DC power supply
(internal power supply circuit)
Unit power supply
Peripheral device
(e.g., computer)
Ground
terminal
Peripheral
device cable
24 V
0 V
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