Omron Sysmac NY Series Hardware User Manual page 155

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.
NY-series Industrial Box PC Machine Controller Hardware User's Manual (W556)
Equipotential bonding
system
Recommended
Earthing methods
Star earthing
Not recommended
5 Installation
Daisy chain
Not recommended
5-29
5