Communication extension card
PROFIBUS communication card
-3-
5. The PROFIBUS protocol is described in details in the EN50170 standard. For more
information about PROFIBUS, refer to the EN50170 standard.
2.3 Electrical connection
1. Node selection
The node address of a device is unique on a PROFIBUS bus. The node address is set
through the function parameter P15.01, and the value ranges from 0 to 127.
2. Fieldbus terminator
Each fieldbus segment is configured with two bus terminators, one on each end, to
prevent operation errors. Bus terminators can protect the fieldbus signal against electrical
reflections. The dual in-line package (DIP) switch on the printed circuit board (PCB) of a
communication card is used to connect to the fieldbus terminator. If the communication
card is the last or first module on the network, the bus terminator must be set to ON.
When a PROFIBUS D-sub connector with a built-in terminator is used, you must
disconnect the communication card from the terminator.
2.4 Bus network connection
1. Bus communication interfaces
The most common PROFIBUS transmission mode is the shielded twisted-pair copper
cable transmission, in which shielded twisted-pair copper cables (complying with the
RS-485 standard) are used.
The basic characteristics of this transmission technology are described as follows:
•
Network topology: Linear bus with one active fieldbus terminal resistor on each end
•
Transmission rate: 9.6 kbit/s–12 Mbit/s
•
Media: Shielded or unshielded twisted-pair cables, depending on the EMC
environmental conditions
•
Number of stations: 32 on each network segment (without repeater); a maximum of
127 (with repeaters)
•
Plug connection: 9-pin D-type plug. The following figure shows the pins of the
connector.
1
5
4
3
2
9
8
7
6
Figure 2-1 Plug of the connector
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