Omron CJ1W-EIP21 用户手册

• 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.

The following table shows the devices recommended for use with the Ether-
Net/IP Unit 

.

• 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