Active components
4.1 Active components for RS485 networks
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
71
Block diagram
The following figure shows a diagram of the RS-485 repeater:
● Bus segments 1 and 2 are electrically isolated.
● Bus segment 2 and the PG/OP socket are electrically isolated from each other.
● Signals are amplified
– Between bus segments 1 and 2
– Between PG/OP socket and bus segment 2
PG/OP
socket
PE
B1
B2
A2
M
A1
Segment 1
B1
A1
Logik
A1
B1
5 V
M5 V
L+ (24 V )
5V
24V
1M
1M
L+ (24 V )
Segment 2
B2
A2
M 5.2
M
5V
24V
Figure 4-2 Diagram of the RS-485 repeater
4.1.1.2 Configuration options with the RS-485 repeater
Overview
The following section explains the configurations in which you can use the RS485 repeater:
● Segment 1 and segment 2 terminated on RS-485 repeater
● Segment 1 terminated on RS-485 repeater and segment 2 looped through on RS-485
repeater
and
● Segment 1 and segment 2 looped through on RS-485 repeater
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