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CHAPTER 9 CC-Link IE FIELD NETWORK DIAGNOSTICS
9
9.3 Diagnostic Window
(b) If the system contains a switching hub
is displayed due to any of the following causes:
• Ring topology is configured even though the loopback function is disabled.
• Star topology is configured even though the loopback function is enabled.
• The network is incorrectly configured in ring topology.
Take the following measures:
1. Check if the loopback function setting is correctly configured. ( Page 121, Section 8.6)
If incorrect, correct the network parameters and rewrite them to the safety CPU module.
When data link starts across the entire network, this procedure is successful.
2. When the loopback function is disabled, perform the following measures.
3. When the loopback function is enabled, take the following measures.
Configure the network in ring topology without a switching hub.
Connecting a switching hub will cause a problem such as data link failure.
( Page 51, Section 5.1.1 (3))
1) Disconnect one Ethernet cable connected to the switching hub and power off and then on the hub.
(Repeat this operation until data link starts over the network.)
2) When data link starts over the network, check the network configuration by CC-Link IE Field
Network diagnostics. ( Page 124, CHAPTER 9)