5 Installation and Wiring
5 - 82
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
This section describes the earthing methods and precautions.
Local potential fluctuations due to lightning or noise occurred by power devices will cause potential fluc-
tuations between ground terminals of devices. This potential fluctuation may result in device malfunc-
tion or damage. To prevent this, it is necessary to suppress the occurrence of a difference in electrical
potential between ground terminals of devices. You need to consider the earthing methods to achieve
this objective.
The recommended earthing methods for each usage condition are given in the following table.
• In a country or region where the earthing method is regulated, you must comply with the reg-
ulations. Refer to the applicable local and national ordinances of the place where you install
the system, or other international laws and regulations.
• For details on wiring EtherCAT or EtherNet/IP, refer to the NJ/NX-series CPU Unit Built-in
EtherCAT Port User’s Manual (Cat. No. W505) or the NJ/NX-series CPU Unit Built-in Ether-
Net/IP Port User’s Manual (Cat. No. W506).
• Ethernet switches are used with the EtherNet/IP. For information on the environmental resis-
tance of the Ethernet switch to use, the grounding between Ethernet switches, or the specifi-
cations of cables, ask the Ethernet switch manufacturer.
5-5-6 Grounding
Considerations for Earthing Methods
Specification of communications cables
for EtherCAT and EtherNet/IP
Earthing methods
Equipoten-
tial bonding
system
Star earthing
Daisy chain
Connecting
devices and
noise sources
to separate
earth elec-
trodes
Connecting
devices and
noise sources
to a common
earth electrode
The cable shield connected to the connector
hood at both ends of the communications
cable
Recom-
mended
Recommended Not recom-
mended
Not recom-
mended
Neither EtherCAT nor EtherNet/IP used Recom-
mended
Recommended Not recom-
mended
Not recom-
mended
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