26
Installation OZD Profi 12M ...
Release
01
07/2017
2.1.1 Line topology with optical fiber link monitoring and
segmentation
This operating mode should preferably be used if an interrupted fiber
segment is to be separated from the rest of the network.
In this operating mode the individual fiber links are monitored by the two
connected repeaters.
If a repeater fails, an optical fiber breaks or faults are determined on the
optical transfer link, the fiber link between the two Fiberoptic Repeater is
interrupted (segmented).
The PROFIBUS network is divided into two partial networks, which remain
functional independently of one other. The malfunction is indicated at the two
OZD Profi 12M ... that are connected to the malfunctioning fiber link by the
port LEDs switching to red and by activation of the signaling contacts. The
segmentation is lifted automatically as soon as both repeaters recognize that
the field bus network is functioning correctly with the help of test frames.
Please note that in the case of networks with several active bus subscribers,
two logical token rings are formed in the event of an error. Every time the
partial networks are switched together, network malfunctions may arise due
to the double tokens or frame collisions.
Note: If a repeater with two optical channels is used at the beginning or end
of a line, the optical port which is not assigned must be switched to the
operating mode ”Line without fiber link monitoring“, so that it does not signal
a break in the fiber line. Please note that optical ports which are not
connected must always be fitted with protective caps to guard against
extraneous light and dirt.
Monitoring mechanisms
Send echo yes
Monitor echo yes
Suppress echo yes
Monitor yes
Segmentation yes
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