Network Installation; Basic Installation Precautions; Recommended Network Devices; Precautions - Omron CJ1W-EIP21 Operation Manuals

2 Installing Ethernet Networks
2-4

Network Installation

2-4-1

Basic Installation Precautions

• Take the greatest care when you install the Ethernet System. Be sure to follow ISO 8802-3 specifica-
tions. 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 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 the network so that the load does not affect communications. For example, install the tag data
links in a segment that is separate from the information network.
2-4-2

Recommended Network Devices

Refer to 2-3 Selecting the Network Devices for the devices recommended for use with the EtherNet/IP
Unit.
2-4-3

Precautions

Precautions on Laying Twisted-pair Cable
• Noise immunity may be reduced by ground loops, which can occur due to improper shield connec-
tions and grounding. Ground the shield at one location, as shown in the following diagram.
• Do not connect the shield to the EtherNet/IP Unit's connector.
• If a cable connects two Ethernet switches, connect the shield at only one end.
Ethernet switch
Connector Connector
GR
(Shield)
• Press the cable connector in firmly until it locks into place at both the Ethernet switch and the Ether-
Net/IP Unit.
• Do not lay the twisted-pair cable together with high-voltage lines.
• Do not lay the twisted-pair cable near devices that generate noise.
• Do not lay the twisted-pair cable in locations subject to high temperatures or high humidity.
2-8
Ethernet switch
Connector Connector Connector
GR
STP
STP
(Shield)
EtherNet/IP port
STP
(Shield)
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
Connect the shield.
Do not connect the shield.
Power
EtherNet/
Supply Unit
IP Unit
Connector
GR terminal
Power
EtherNet/
Supply Unit
IP Unit
Connector
GR terminal