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TC2100 DM
User's Manual
Ver. 1.6
MNL-21000-01-16
Figure 11. The network is cut in half
In case two, both A-ring and B-ring are broken in different locations, and the rings are cut in half. (See figure
11.) The self-healing ring is able to keep the network between “unit 1” and “unit 2” up, but “unit 3” and “unit
4” will still be down because they are isolated from the cable breakage. The main master unit (unit 1) is only
able to transmit data to “unit 2.” However, with “unit 3” in “Dual Master Mode,” it can be a backup master
by connecting to a host controller. This way, “unit 3”will become a master unit, and it can transmit signals
to “unit 4.” The entire network will then function normally.
Case 2:
unit 1
unit 2
unit 4
unit 3
Both rings are broken, and the network is cut in half.
The Main Master unit is unable to send signals to unit 3
and unit 4.
Unit 3 became 2nd Master unit for sending signals to unit 4.
It will keep the network between unit 3 and unit 4 functional.
