Connecting
7.8 PROFIBUS DP
NCU 7x0.3 PN
68 Manual, 09/2011, 6FC5397-1EP40-0BA0
MPI bus cable
The PROFIBUS cable specifications apply here as well. Please note the relevant information
on setting up an MPI network.
Setting up an MPI network
Keep in mind the following basic rules when setting up an MPI network:
● When using the interface as an MPI interface, it is not possible to arrange additional
control for a drive in isochronous mode or to connect distributed I/Os to this interface.
● An MPI bus line must be terminated at both ends. This is achieved by activating the
terminating resistor in the MPI connector in the first and last station and deactivating the
other terminating resistors.
● At least one terminator must be supplied with 5 V.
This means that an MPI connector with an activated terminating resistor must be
connected to a device that is switched on.
● Spur lines (cables leading from the bus segment to the node) should be as short as
possible, i.e. < 5 m in length. Unused spur lines should be removed wherever possible.
● Every MPI station must be connected to the bus first and then activated.
To disconnect the station, it must first be deactivated. Then, the station can be removed
from the bus.
● Maximum cable lengths:
– 200 m per bus segment
– 2000 m total length with RS 485 repeaters
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