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Communication extension card
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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
Figure 2-3 PROFIBUS bus connection
shows the terminal wiring. The cables are standard PROFIBUS cables, each consisting of a twisted
pair and shielding layer. The shielding layers of PROFIBUS cables are directly grounded on all nodes. You can
select a proper grounding mode based on the actual situation on site.
Note:
1. When connecting the stations, ensure that the data cables are not twisted together. For systems to be
used in environments with strong electromagnetic radiation, you need to use cables with shielding layers.
The shielding layers can improve electromagnetic compatibility (EMC).
2. If shielding braid or shielding foil is used, connect the two ends of it to the protective ground and cover
an area as large as possible to ensure high conductivity. In addition, data cables need to be separated from
high-voltage cables.
3. When the data transmission rate is higher than 500 kbit/s, do not use short stub. Use the plugs available
in the market. Data input and output cables can be directly connected to those plugs, and the plug of the
communication card can be connected or disconnected at any time without interrupting data
communication of other stations.
2.5
System configuration
1.
System configuration
After the communication card is properly installed, you need to configure the master station and VFD
to enable the communication between the master station and communication card.
One device description file named GSD file is required for each PROFIBUS slave station on the PROFIBUS
bus. The GSD file is used to describe the characteristics of the PROFIBUS-DP device. The software we
provide for users includes information about the GSD file of the VFD. You can obtain the type definition
files (GSD files) of various masters from ASTOR.