Omron SYSMAC CJ1W-EIP21 - Manual (Page 67)

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Network Installation Section 3-4
3-4 Network Installation
3-4-1 Basic Installation Precautions
• Take the greatest care when installing the Ethernet System, being sure to
follow ISO 8802-3 specifications. You must obtain a copy of these specifi-
cations and be sure you understand them before attempting to install an
Ethernet System. Unless you are already experienced in installing com-
munications systems, we strongly recommend that you employ a profes-
sional to install your system.
• Do not install Ethernet equipment near sources of noise. If a noisy envi-
ronment is unavoidable, take adequate measures against noise interfer-
ence, such as installing network components in grounded metal cases or
using optical cable in the system.
• When installing an EtherNet/IP network that combines an information sys-
tem with the control system, and the communications load may be heavy
due to tag data links, we recommend configuring 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.
Note The maximum current consumption of the CS1W-EIP21 and CJ1W-EIP21
EtherNet/IP Units is 410 mA. Be sure that the total current consumption of all
the Units connected to the same CPU Backplane or Expansion Backplane
does not exceed the output capacity of the Power Supply Unit.
3-4-2 Recommended Products
The following table shows the devices recommended for use with the Ether-
Net/IP Unit
2-3 Selecting the Network Devices .
3-4-3 Precautions
Precautions on Laying Twisted-pair Cable
• Noise resistance may be reduced by ground loops, which can occur due
to improper shield connections 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 hubs, connect the shields at only one end.
Hub Hub
Connector Connector Connector
Connector
Connector Connector
GR GR
Connect shield.
Do not connect shield.
STP
(Shield)
STP
(Shield)
STP
(Shield)
EIP
Unit
Power
Supply
Unit
GR
terminal
Connector
EIP
Unit
Power
Supply
Unit
GR
terminal