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12.2 Troubleshooting
12.2.29 When Ethernet communication with CPU module is slow or unstable
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TROUBLESHOOTING
* 3 : A communication error may occur due to high-frequency noise emitted from a device other than
programmable controllers. The following measures can be taken to protect network systems from
high-frequency noise.
Wiring
• Do not install twisted pair cables together with the main circuit or power cables.
• Put twisted pair cables in a duct.
• Replace UTP cables with STP cables.
Communication method
• Use TCP/IP to exchange data with the target device.
• Increase the number of communiccation retries, if necessary.
• 10Mbps communication
• In the case of using 100Mbps, replace the hub with a 10Mbps hub and perform data
communication at a transmission speed of 10Mbps.
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