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5.2 Network Components
This section describes the devices used for Ethernet.
An E71 determines whether to use 100BASE-TX or 10BASE-T and the full-duplex or half-duplex transmission mode
according to the hub. For connection to a hub without the automatic negotiation function, set the half-duplex mode on the
hub side.
(1) 100BASE-TX connection
To configure a system for 100BASE-TX connection, use devices that meet the IEEE 802.3 100 BASE-TX
standards.
*1 This applies when a repeater hub is used. For the number of levels that can be constructed when a switching hub is
used, consult with the manufacturer of the switching hub used.
*2 Data can be communicated with an E71 (between LJ71E71-100 modules). In addition, an E71 can be directly connected
to a GOT.
During high-speed communications (100Mbps) using 100BASE-TX connection, a communication error may occur due to
high-frequency noise from devices other than a programmable controller in a given installation environment. The following
lists countermeasures to be taken on the E71 side to avoid high-frequency noise influence.
● Wiring connection
• Do not bundle the cable with the main circuit or power cable or do not place it near those lines.
• Put the cable in a duct.
● Communication method
• Use TCP/IP for data communications with connected devices.
• Increase the number of retries of communications if needed.
● 10Mbps communications
• Use a 10Mbps hub for the E71 and set the data transmission speed to 10Mbps.
• Change the transmission speed of the E71 to 10Mbps using the UINI instruction. ( Page 233, Section
15.13)
Consult a network specialist for required devices.
Configuration device Description
Shielded twisted pair
cable (STP)
*2
Straight cable A Category 5 or 5e cross cable is usable.
Cross cable A Category 5 or 5e cross cable is usable.
Connector RJ45 connector
Hub 100Mbps hub
Up to two levels of cascade connection can be configured.
*1
Connected device
E71
Hub
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