Linking Bus Segments With Rs 485 Repeaters - Siemens SIMATIC S5 Manual

System overview
Rules for more
than 32 stations
Linking bus
segments
1-6
If you want to have more than 32 stations connected to the bus, you must
insert RS 485 repeaters between the individual bus segments.
All bus segments together must have at least one DP master and one DP
slave.
The configuration below will serve by way of example:
Master No. 20
Slave No. 4
Segment 3
Slave No. 6
: Station (master or slave)
: Station with terminating
resistor in circuit
Figure 1-2

Linking bus segments with RS 485 repeaters

Segment 1
Slave No. 64
R
Master No. 73
Slave No. 10
R
Slave No. 12 Slave No. 21
: RS 485 repeater
R
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Segment 2