Technical data

PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
67
Active components
4
4.1 Active components for RS485 networks
4.1.1 485 repeater
4.1.1.1 Functions and properties of the RS-485 repeater
What is an RS485 repeater?
The RS 485 repeater amplifies data signals on bus lines and couples bus segments.
Use of the RS-485 repeater (6ES7 972-0AA01-0XA0)
The RS-485 IP 20 repeater connects two PROFIBUS or MPI bus segments using RS-485
technology with a maximum of 32 nodes. It allows transmission rates from 9.6 kbps to 12
Mbps.
You require an RS-485 repeater when:
● There are more than 32 stations (maximum 127, including repeaters) connected to the
bus
● Bus segments are operated ungrounded on the bus (electrical isolation of segments), or
● The maximum cable length of a segment is exceeded