Mitsubishi Electric CC-Link IE TSN FR-A8NCG Instruction Manual page 27

 Connecting/disconnecting a cable and powering ON/OFF a device
When the operations listed below are performed, all stations on the network may be reconnected. At that time, a data link error
may momentarily occur in all the stations, and the communication error E.OP1 may occur in the connected inverters.
Network configuration
Star topology
Line topology, ring topology
To keep outputting a data link error (inverter communication error), set Pr.500 Communication error execution waiting time
or Pr.502 Stop mode selection at communication error
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WIRING
• Powering ON/OFF a slave station or the switching hub
• Connecting/disconnecting an Ethernet cable connected to the switching hub
• Disconnecting an Ethernet cable from a slave station and connecting it to another slave station or to the
switching hub
• Disconnecting ten stations or more, or disconnecting half the number of slave stations in the system or more
• Changing the network topology when adding a slave station
• Simultaneously powering ON/OFF multiple stations
• Simultaneously connecting/disconnecting Ethernet cables to/from multiple stations
(When a data link faulty station returns, a data link error will occur in all the stations.)
• Disconnecting ten stations or more, or disconnecting half the number of slave stations in the system or more
• Changing the network topology when adding a slave station
At plug in/unplug or power ON/OFF
Operation
A momentary error
in all stations