10.2 Applications and features (6ES7972-0AA01-0XA0)
Application of the RS 485 repeater
The RS 485 repeater amplifies data signals on bus lines and couples bus segments. You need
an RS 485 repeater for the following situations:
● There are more than 32 nodes connected to the bus.
● Bus segments should be operated ungrounded on the bus.
● The maximum cable length of a segment is exceeded.
Table 10-1 Maximum cable length of a segment
Baud rate Max. cable length of a segment (in m)
9.6 to 187.5 Kbps 1000
500 Kbps 400
1.5 Mbps 200
3 to 12 Mbps 100
Rules
The following applies if you configure the bus with RS 485 repeaters:
● No more than 9 RS 485 repeaters can be connected in series.
● The maximum cable length between two nodes with RS 485 repeater may not exceed the
values listed in the table below.
Table 10-2 Maximum cable length between two RS 485 repeaters
Baud rate Max. cable length between 2 nodes (in m)
with the RS 485 repeater (6ES7 972-0AA01-0XA0)
9.6 to 187.5 Kbps 10000
500 Kbps 4000
1.5 Mbps 2000
3 to 12 Mbps 1000
RS 485 repeater
10.2 Applications and features (6ES7972-0AA01-0XA0)
S7-400 Automation System Module Data
388 Reference Manual, Ausgabe 11/2016, A5E00850736-08
To Next Page
Loading...
