Communication extension card
PROFIBUS communication card
-5-
3. Transmission rates and maximum transmission distances
The maximum length of a cable depends on the transmission rate. Table 2-2
describes
the transmission rates and corresponding transmission distances.
Table 2-2 Transmission rates and corresponding transmission distances
Transmission rate (kbps)
A-type wire (m)
B-type wire (m)
9.6
1200
1200
19.2
1200
1200
93.75
1200
1200
187.5
1000
600
500
400
200
1500
200
-----
12000
100
-----
Table 2-3 Transmission wire parameters
Parameter
A-type wire
B-type wire
Impedance (Ω)
135–165
100–130
Capacitance of a unit length (pF/m)
< 30
< 60
Circuit resistance (Ω/km)
110
--------
Wire core diameter (mm)
0.64
> 0.53
Sectional area of wire core (mm
2
)
> 0.34
> 0.22
Besides the shielded twisted-pair copper cables, you can also use optical fibers for
transmission in a PROFIBUS system. When a PROFIBUS system is applied in an
environment with strong electromagnetic interference, you can use optical fiber conductors to
increase the high-speed transmission distance. Two types of optical fiber conductors can be
used. One is low-cost plastic fiber conductors that can be used when the transmission
distance is shorter than 50 m; and the other is glass fiber conductors that can be used when
the transmission distance is shorter than 1 km.
4. PROFIBUS bus connection diagram
PROFIBUS
master station
INVT inverter
INVT inverter
A
B
B
GND
SHLD
SHLD
A
B
CH-PA01 adapter
A
CH-PA01 adapter
Figure 2-3 PROFIBUS bus connection
Содержание Goodrive350 Series
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