Network Installation; Basic Installation Precautions; Recommended Network Devices; Precautions When Laying Twisted-Pair Cable - Omron NJ Series User Manual

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Network Installation

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Basic Installation Precautions

• Take the greatest care when you install the Ethernet System. Be sure to follow ISO 8802-3 specifi-
cations. Be sure you understand them before attempting to install an Ethernet System.
• Unless you are already experienced in installation of communications systems, we strongly recom-
mend that you employ a professional to install your system.
• Do not install Ethernet equipment near sources of noise.
If a noisy environment is unavoidable, take adequate measures against noise interference, such as
installation of network components in metal cases or the use of optical cable in the system.
• When using a shielded cable with the shields on both ends of the cable connected to connector
hoods, ground loops induced by improper grounding methods may decrease noise immunity and
cause device damage. To prevent ground loops caused by differences in potential between device
grounding points, the reference potential between the devices must be stabilized. Design grounding
appropriately so that noise current does not flow to ground lines between the devices. For grounding
methods, refer to the NJ-series CPU Unit Hardware User's Manual (Cat. No. W500), NX-series CPU
Unit Hardware User's Manual (Cat. No. W535), NX-series NX102 CPU Unit Hardware User's
Manual (Cat. No. W593), or NX-series NX1P2 CPU Unit Hardware User's Manual (Cat. No. W578).
• To obtain information on installing EtherNet/IP cable, contact ODVA.
ODVA web site: http://www.odva.org
• When you install an EtherNet/IP network that combines an information network with the control sys-
tem, and the communications load may be heavy due to tag data links, we recommend that you set
up a network where the load does not affect communications. For example, install the tag data links
in a segment that is separate from the information network.
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Recommended Network Devices

Refer to 2-1 Selecting the Network Devices on page 2-2 for the devices recommended for use with the
built-in EtherNet/IP port.
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Precautions When Laying Twisted-pair Cable

Connecting the Shield to Connector Hoods
 Between an EtherNet/IP Port and an Ethernet Switch
Connect the shield to connector hoods as described below.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
2 Installing Ethernet Networks
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