30
Installation OZD Profi 12M ...
Release
01
07/2017
2.3 Redundant ring
Figure 3: Network structure in a redundant optical ring topology
This network topology represents a special form of line topology. A high
degree of network operating safety is achieved by ”closing“ the optical line.
A redundant optical ring ca only be realized with repeaters with two optical
ports of the same fiber.
An interruption of one or both optical fibers between two repeaters is
detected by the OZD Profi 12M ... and the ring is transformed into an optical
line.
If one repeater fails only those terminals connected to this repeater or the RS
485 segment are uncoupled from the ring. The remainder of the network itself
continues to function as a line. The error is indicated by the LEDs on the two
OZD Profi 12M ... connected to the malfunctioning optical fiber and their
signaling contacts. The segmentation is lifted automatically as soon as both
repeaters recognize that the segmented field bus network is functioning
correctly with the help of test frames. The line forms itself into a ring.
Monitoring mechanism
Send echo yes
Monitor echo yes
Suppress echo yes
Monitor yes
Segmentation yes
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