Configuring Electrical Networks With Rs-485 Repeaters - Siemens SIMATIC NET PROFIBUS Owner's Manual

3.1.4

Configuring Electrical Networks with RS-485 Repeaters

RS-485 Repeater
To increase the number of nodes (>32) in a network or to extend the cable length
between two nodes, segments can be connected together using RS-485 repeaters
to form a network. Figure 3-1 illustrates how several segments can be connected
together with repeaters to create a network.
The RS-485 repeaters support all transmission rates from
9.6 Kbps to 12 Mbps.
S7-300
ET200S
À
À
OP 25
À
À Terminating resistor activated
Figure 3-1 Layout of an Electrical PROFIBUS Network Using RS-485 Repeaters
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
À
OP 25
S7-300
À
RS-485
repeater
À
OP 25
ET200M
À
S7-300
OP 25
À
À
ET200M
OP 25
À
À
ET200S
OP 25
Configuring Networks
PG
À
3-9