GW-7553-B / GW-7553-M PROFIBUS/Modbus TCP Gateway User Manual
(Version 1.35, May/2017)
PAGE: 11
2.3.3 PROFIBUS Connection
The PROFIBUS interface of the GW-7553-B / GW-7553-M is a DB9 female
connector. The connector uses the standard PROFIBUS 9 pin assignment. It is
recommended to use a standard PROFIBUS cable and connector (DB9 male).
As with every serial bus the rate of safe data transmission in a PROFIBUS
network decreases with increasing distance between Master and Slave.
Table 6
shows the transmission rate and range for a cable with the following properties:
1.
Impedance :135~165 Ω
2.
Capacity : lower than 30 pF/m
3.
Loop resistance : lower than 110 Ω/km
4.
Wire diameter : greater than 0.65 mm
5.
Core cross-section : greater than 0.34 mm
2
Table 6 Transmission rate decreasing with increasing transmission distance
Transmission Rate(kbps) Transmission Distance per Segment (meter)
9.6, 19.2, 45.45,93.75
1200
187.5
1000
500
400
1500
200
3000, 6000, 12000
100
In order to minimize the reflection effect of signal transmission, both ends (first
node and last node) of a PROFIBUS segment needs to be equipped with an
active terminal resistor as shown in
Figure 6
. A standard PROFIBUS connector
is usually already equipped with a terminal resistor. The user therefore only has
to switch on the resistor of the devices stationed at the ends of a segment as
shown in
Figure 7
.
Содержание GW-7553-B
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