Soft-Starter SSW-06 Characteristics on Fieldbus Network
SSW-06 | 9
2.1.5 Profibus DP Cable
It is recommended to perform the installation with type A cable, which characteristics are described in the Table
5: Properties of the cable Type A
To ensure higher immunity against electromagnetic interferences, the cable has a pair of wires that must be
twisted and shielded.
Table 5: Properties of the cable Type A
2.1.6 Connection of the Drive to the Network
The Profibus DP protocol, using the interface RS485, allows the connection of up to 32 devices per segment
without requiring the use of repeaters. Wit the use of repeaters, up to 126 addressable equipments may be
connected to the network. Each repeater must be included as a device connected to the segment although
they do not require an address on the network.
We recommend that the connections of all devices of the Profibus DP network are made through the main bus.
In general, the connector of the Profibus network has a one input and one output for the cable, allowing that the
connection can be brought to the other network points. We do not recommend the use of derivations from the
main line, manly when the used communication baud rates are equal or higher than 15.5Mbit/s.
Figure 2: Soft-Starters SSW-06 in Profibus DP network
The passage of the Profibus DP network cable must be laid separately (and if possible distant) from the power
supply cables. All drives shall be grounded properly, preferably on the common grounding connection. Also the
Profibus cable shield must be grounded. The DB9 connector of the Soft-Starter SSW-06 Profibus board has
already a connection to the ground protection and so establishes the shield connection to the ground when the
Profibus connector is connected to the drive. However we also recommend a clip fastening between the shield
and the grounding point.
2.1.7 Termination Resistor
For each Profibus DP network segment you must enable a termination resistor at the end points of the main
bus. The own Soft-Starter SSW-06 communication board is fitted with a resistor enable switch. When the drive
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