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MELSEC-F
SYSTEM CONFIGURATIONS2
2 - 3
(2) Connection using the 10BASE-T
Use devices that satisfy the standards of IEEE802.3 and 10BASE-T.
• Shielded twisted pair cable (STP cable), category 3 (4, 5)
* Use a straight cable for connection between a hub and the Ethernet module.
(When connecting an external device to the Ethernet module directly without
a hub use a cross cable.
However, operation is not guaranteed when connecting the Ethernet
module directly to an external device with a cross cable, except when
connecting two Ethernet modules.)
• RJ45 plug
• 10Mbps hub
POINT
• During the high-speed communication (100 M bps) via 100BASE-TX
connection, a communication error may occur due to the effect of high
frequency noise from devices other than PLC in a given installation
environment.The following describes countermeasures on the Ethernet module
side to prevent the effect of high frequency noise for construction of a network
system.
(1) Wiring connection
• Do not bundle the twisted pair cables with the main circuit and power wires,
and do not install them close to each other.
• They should be installed at least 100 mm (3.94 in) away from each other.
• Make sure to place the twisted pair cables in a duct.
(2) Communication method
• Data communication with an external device is performed using TCP/IP
communication.
• Increase the number of communication retries as necessary.
[When the error cannot be solved]
• Communication is performed at a data transmission rate of 10 M bps by
changing the connection hub for the Ethernet module to a hub capable of
handling 10 M bps.
External device
Twisted pair cable
Hub
* Up to 4 levels are allowed
for cascade connection
Ethernet module