Mitsubishi Electric QJ71E71-100 User Manual page 74

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
describes countermeasures to be taken on the E71 side to avoid high-frequency noise influence.
• Wiring connection
• Communication method
• 10Mbps communications
Remark
Consult a network specialist for required devices.
(2) 10BASE-T connection
To configure a system for 10BASE-T connection, use devices that meet the IEEE 802.3 10BASE-T standards.
Unshielded twisted
pair cable (UTP) or
shielded twisted pair
cable (STP)
Connector
Hub
*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.
Remark
Consult a network specialist for required devices.
72
• 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.
• Use TCP/IP for data communications with connected devices.
• Increase the number of retries of communications if needed.
• 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. (
Section 15.13)
Configuration device
Straight cable
Cross cable
RJ45 connector
10Mbps hub
Connected device
E71
Hub
A Category 3 to 5e straight cable is usable.
System operation using connection with a cross cable is not
guaranteed. Note, however, that a Category 3 to 5e cross cable can be
used for data communications with an E71 (between QJ71E71-100
modules) or connection with a GOT.
Up to four levels of cascade connection can be configured.
Page 276,
Description
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*1