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Section 3 Fieldbus Topologies
Fieldbus Topology with RS485 (PROFIBUS DP)
3BDS009029R5001 B
65
Fieldbus Topology with RS485 (PROFIBUS DP)
Bus length and speed
When a PROFIBUS network is installed, boundary conditions of the RS485 transfer
technology must be observed. The electrical network uses a shielded, twisted pair
cable. All subscribers are connected in a line-shaped bus. The transmission rate can
be adjusted in steps from 9.6 kbit/s to 1.5 Mbit/s. For extremely time-critical
PROFIBUS-DP applications, additional transmission rates of 3, 6 and 12 Mbit/s are
possible.The maximum segment length depends on the transmission rate.
Figure 20. Bus length and speed
m
10
15
100
1000
1200
10000
100
1 K
10 K
100 K
1 M
10 M
20 K
RS 232C
Transmission rate [bit/s]
RS 485
19.
2 kB
it/
s
93
.7
5 kB
it/
s
1
87.
5 kB
it
/s
5
00 k
B
it
/s
15
00 kB
it/
s
120
00 kB
it
/s
9.
6 kBi
t/
s
RS 485: PROFIBUS-DP
max. segment length
in case of copper
conductor cable
3
000
kBi
t/
s
60
00 kB
it
/s
1000 m
400 m
200 m
100 m
1200 m
45
.4
5 kBi
t/
s
Содержание AC 800M
Страница 1: ...Power and productivity for a better worldTM AC 800M PROFIBUS DP Installation System Version 5 0 5 1...
Страница 2: ......
Страница 3: ...AC 800M PROFIBUS DP Installation System Version 5 0 5 1...
Страница 8: ...Table of Contents 8 3BDS009029R5001 B...
Страница 16: ...Released User Manuals and Release Notes About This User Manual 16 3BDS009029R5001 B...
Страница 29: ...Section 2 Transmission Technology RS485 network limits 3BDS009029R5001 B 29 Figure 2 RS485 network limits...
Страница 56: ...Calculation of transmission delay time TTD Section 2 Transmission Technology 56 3BDS009029R5001 B...
Страница 116: ...Updates in Revision Index B 116 3BDS009029R5001 B...
Страница 117: ......