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

2 Installing Ethernet Networks
2-2

Network Installation

2-2-1

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 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), the NX-series
CPU Unit Hardware User's Manual (Cat. No. W535) or the NX-series NX1P2 CPU Unit Hardware
User's Manual (Cat. No. W578).
• To obtain information on laying 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 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.
2-2-2

Recommended Network Devices

Refer to 2-1 Selecting the Network Devices for the devices recommended for use with the built-in Eth-
erNet/IP port.
2-2-3

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-series CPU Unit
10Base-T
• Connect both ends
or
• Connect Ethernet Switch side only
*1 For NX701 CPU Units only.
• 10Base-T or 100Base-TX
Connect the cable shields to the connector hoods as described in either a) or b) below.
2-6
NX-series CPU Unit
100Base-TX 10Base-T
• Connect both ends
or
• Connect the Ethernet Switch side only. A
clamp core must be attached to the Eth-
erNet/IP port side of the cable.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
100Base-TX 1000Base-T *1
Connect both ends