Line Topology Without Redundancy - Belden HIRSCHMANN OZD Modbus Plus G12 Manuel

2 Network Topologies

2.2 Line topology without redundancy

This network topology is used in the case of an optical
link between data terminal units or bus segments.
As many repeaters as required can be operated in an
optical line. For the safe and reliable operation of the
ring redundancy, it is necessary that at least one active
terminal unit is connected to the electrical port (Port 1)
of each OZD Modbus Plus G12 ... Repeater.
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
Modbus Plus bus line
Fiber optic cable
Fig. 4: Line topology without redundancy
Version 04 07/2014
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
2.2 Line topology without redundancy
The first and last repeater in the line should be terminated
with an "optical short-circuit" (see Fig. 4). In this case,
each input and output of the free ports are connected to
BFOC connectors via a short length of optical cable.
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
E S E S
Port 2 Port 3
OZD Modbus
Plus G12 ...
Terminal unit(s)/
bus segment(s)
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