Rtu560 Integration; Network Structures; Line Topology; Point-To-Point Topology - Hitachi EDS500 Series Manual

System concept
3.2.5

RTU560 integration

All products of the EDS500 series - FSK modems are also available as plugin modules for RTU560.
3.3

Network structures

Devices of the EDS500 series allow you to realize a wide variation of network structures like point-
to-point connections, lines, stars and branches. The following small examples should give an
overview of possible network variants.
3.3.1

Line topology

A line topology usually follows the physical path of an infrastructure installation, e.g. an energy line
or pipeline. 500FSD analog modems realize a line topology by physically connecting all modems to
the same copper cable via two or four wires. In this so called partyline or multidrop configuration the
application protocol provides a polling scheme to query and control the different stations.
Control center
500FSDxx
Figure 1: Line topology
3.3.2

Point-to-point topology

Point-to-point connections can be used if possible by the physical environment or if high throughput
is required. The point-to-point connection can utilize either two or four wires. In four wire mode the
connection can be operated full-duplex allowing symmetric protocols to be used (e.g. symmetric
IEC 60870-5-101). If two wires are used, full-duplex operation can be achieved by using 500FSD20
and frequency-separated channels in transmit and receive direction.
1KGT151042 V001 1
Staon 1
RTU/IED
Cu
500FSDxx
Functions overview
Staon 2
RTU/IED
500FSDxx
Staon 3
RTU/IED
500FSDxx
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