Loopback Function - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

1.5

Loopback Function

This function continues data link with normal stations even if a cable disconnection or faulty station occurs. All stations after
the cable disconnection point or faulty station are disconnected in a line topology. By using this function with ring topology,
data link continues with normal stations.
The RJ71EN71 and RnENCPU can be used only when "Port 1 Network Type" is set to "CC-Link IE Field".
Cable disconnection
Ring topology
Even if a cable disconnection occurs, the system automatically performs loopback to continue the data link.
Line topology
Stations connected after the cable disconnection point are disconnected.
Occurrence of faulty stations
Ring topology
The system disconnects faulty stations and automatically performs loopback to continue the data link.
Line topology
Stations connected after the faulty station are disconnected.
Setting method
1.
Configure the network in ring topology.
2.
Set "Network Topology" to "Ring" in "Basic Settings" of the master station.
1 FUNCTIONS
66
1.5 Loopback Function
Disconnected
Disconnected
Fault
Fault