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Probifus-DP description
3.3
RS 485 transmission technology
CAUTION!
When installing PROFIBUS systems, the installation guidelines of PNO
(PROFIBUS NUTZERORGANISATION e. V.) must be observed.
Transmission takes place according to the RS485 standard. It covers all areas in which
a high transmission rate and simple, cost-effective installation technology is required. A
shielded, twisted copper cable with one conductor pair is used.
The bus structure permits addition and removal of stations or step-by-step commissioning
of the system without affecting other stations. Subsequent expansions have no influence
on the stations already in operation.
The transmission speed is selectable within a range of 9.6 Kbit/s to 12 Mbit/s. During
system commissioning, one common transmission speed is selected for all devices on the
bus.
Basic characteristics
Network- topology
Medium
Number of stations
Connector
Structure
All devices must be connected in a line structure (one after another). Up to 32 stations
(masters or slaves) can be linked within such a segment. Repeaters are required for more
than 32 stations, for instance, to increase the number of devices further.
Cable length
The maximum cable length depends on the transmission speed.
The cable length specified can be extended by the use of repeaters.
It is recommended to limit the number of repeaters connected in series to a total of 3.
Baud rate
9,6
(Kbit/s)
Range/
1200 m
segment
417102396 Rev. 2-08.2023
Wiring of bus users is based on bus topology. Several bus segments can be connected
by repeaters. Stub lines should be avoided.
Shielded, twisted cable to EN 50 170 Part 8-2
32 stations in each segment without repeater (line amplifier); with repeaters, extension
to 126 stations possible
Preferably, 9-pin D-Sub connector
19,2
93,75
1200 m
1200 m
18
187,5
500
1000 m
400 m
1500
12000
200 m
100 m
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