Loopback Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Loopback Function

This function continues data link with normal stations even if a cable disconnection or faulty station occurs in a ring topology
network configuration. 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.
Before using this function, check the firmware version of the RJ71GN11-T2. ( Page 320 Added and
Enhanced Functions)
Cable disconnection
■Ring topology
Even if a cable disconnection occurs, the system automatically performs a 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 a loopback to continue the data link.
■Line topology
Stations connected after the faulty station are disconnected.
Disconnected
Disconnected
Fault
Fault
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1.5 RAS