Mitsubishi Electric MELSEC Q80BD-J71GF11-T2, User Manual

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5 FUNCTIONS
5.8 Loopback Function
5.8
Loopback Function
The loopback disconnects the station in which an error has occurred from the network and continues data link with the
stations that are operating normally. Stations connected after the faulty station can also continue data link.
Setting method
Configure the network in ring topology and set "Use" for "Loopback Function Setting" on the "Supplementary Setting" screen
in "Network Configuration Setting". (

Page 102 Supplementary setting)
Precautions
For network topology other than ring topology, clear the check box.
If the loopback function setting and the network configuration are inconsistent, an error may occur in all stations and data link
cannot be performed.
Whether loopback is being performed or not can be checked by link special relay (SB) and link special register
(SW) for the master station. (

Page 188 Link Special Relay (SB) List, Page 199 Link Special Register (SW)
List)
Ring topology
Line topology
Error
Error
If an error occurs, the system will loopback data,
continuing data link.
Stations after the error station are disconnected.
Select the check box.