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2
SYSTEM CONFIGURATION
2 - 4
POINT
In high-speed communication (100Mbps) by the 100BASE-TX connection, a
communication error may occur under the influence of high frequency noise from
devices other than the programmable controller in the installation environment.
Take the following action on the QJ71MT91 side to prevent the influence of high
frequency noise in the construction of a network system.
(1) Wiring connection
Do not install a twisted pair cable together with the main circuit lines or power
cables.
Place the twisted pair cable in a duct.
(2) Communication system
Increase the number of communication retries if necessary.
Change the hub used for connection into a 10Mbps hub, and make
communication at a transmission speed of 10Mbps.
MELSEC-Q
2 - 4
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