32
Setting up a PROFIBUS Network
Section 2-5
two devices in the network. The following figure presents an example of a net-
work with more than three segments and repeaters.
Cable Type
The PROFIBUS standard EN 50170 specifies Type A shielded, twisted- pair
cable as the recommended cable type for use in an RS-485 based PROFI-
BUS network. This cable type has the following characteristics:
Note The PROFIBUS standard EN 50170 also specifies a Type B cable with slightly
different cable characteristics. This Type B cable is no longer recommended
for use.
Maximum PROFIBUS
Cable Length
The transmission speed defines the maximum advised cable distance or
cable segment in metres before the use of a repeater is recommended. The
cable lengths specified in the following table are based on PROFIBUS type A
cable.
Segment 1
Max. 31 stations
Segment 2
Max. 31 stations
M / S
M / S
M / S
M / S
Segment 3
Max. 28 stations
Segment 4
Max. 31 stations
Segment 5
Max. 30 stations
Segment 6
Max. 31 stations
M / S
R
R
R
R
M / S
R
Master or slave station
Repeater
Termination
Max. total number of stations = 126
M / S
R
Characteristic
Value
Impedance
135 - 165 ohms
Capacitance per unit length
< 30 pF/m
Loop resistance
110 ohms/km
Core diameter
0.64 mm
Core cross section
0.34 mm
2
Baud rate
(kbit/s)
Distance/segment
(m)
Baud rate
(kbit/s)
Distance/segment
(m)
9.6
1200
500
400
19.2
1200
1500
200
45.45
1200
3000
100
93.75
1200
6000
100
187.5
1000
12000
100
Summary of Contents for PROFIBUS DP GATEWAY
Page 1: ...OPERATION MANUAL PROFIBUS DP Gateway to Host Link Compoway F PRT1 SCU11 Cat No W01E EN 02 ...
Page 2: ...PRT1 SCU11 PROFIBUS DP Gateway Operation Manual Revised September 19 2005 ...
Page 3: ...iv ...
Page 15: ......
Page 31: ......
Page 71: ......
Page 77: ......
Page 81: ......