Omron NYB17-*100 SERIES User Manual page 126

5 Installation
Considerations for Earthing Methods
Local potential fluctuations due to lightning or noise occurred by power devices will cause potential
fluctuations between ground terminals of devices. This potential fluctuation may result in device mal-
function or damage. To prevent this, it is necessary to suppress the occurrence of a difference in elec-
trical 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.
Specification of commu-
nications cables
The cable shield connect-
ed to the connector hood
at both ends of the com-
munications cable
Additional Information
• 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.
• Ethernet switches are used with the EtherNet/IP. For information on the environmental resist-
ance of the Ethernet switch to use, the grounding between Ethernet switches, or the specifi-
cations of cables, ask the Ethernet switch manufacturer.
Each of these earthing methods is given below.
5 - 30
Equipotential bonding
system
Recommended
NY-series Industrial Box PC Without Operating System User's Manual (W586)
Earthing methods
Star earthing
Not recommended
Daisy chain
Not recommended