Chapter 3
.
PROFIBUS Network Adapters
GFK-2746B
PACSystems* RSTi PROFIBUS and PROFINET Network Adapter
–August 2013
43
The cable parameters specified for standard Type A bus cables result in the maximum length
of each bus segment for the respective data transfer rate as shown in the below table.
■
Maximum Cable Lengths per Segments
Table 26: Maximum Cable Lengths per Segments
Baud rate 9.6
19.2
45.45 93.75
187.5 500
1500
3000
6000 12000
Maximum
segment
Length in
‘m’(m)
1200
1200
1200
1200
1000
400
200
100
100
100
Note:
In a PROFIBUS-DP/FMS installation, you must choose a data transfer rate which is
supported by all devices connected to the bus. The chosen data transfer rate then
determines the maximum segment lengths as shown above.
The maximum admissible distance between two bus stations in each PROFIBUS network
can be calculated as follows:
(1)*Segment length,
Where NO_REP =The maximum number of repeaters connected in series (depends on
repeater type).
Example
: The repeater manufacture specifications allow nine repeaters to be connected in
series. The maximum distance between two bus stations at a data transfer rate of 1500 kbit/s
is then as follow:
(9+1)*200m=2000 m
Summary of Contents for PACSystems RSTi
Page 4: ......
Page 8: ......
Page 88: ...88 PACSystems RSTi PROFIBUS and PROFINET Network Adapter August 2013 GFK 2746B...
