Technical data

Computing Unit Expansions
4-31
SIMATIC Panel PC 670 Computing Unit Equipment Manual
Edition 12/01
4.11 Network Connections and Interconnections
4.11.1 Connecting the MPI/DP Port
Connecting a PROFIBUS-DP network via the MPI/DP port
You can connect the computing unit to PROFIBUS-DP networks via the isolated *)
MPI/DP port. The physical connection is established with SINEC-L2 components for
stationary connections or using the 5 m long MPI connecting cable for non-stationary
connections. SINEC-L2 components and MPI connecting cables are not included in
the scope of supply of the computing unit and have to be ordered separately. The MPI
connecting cable (5 m) can only be used for transfer rates up to 187.5 Kbaud.
To connect the computing unit to a PROFIBUS-DP network, perform the following
steps:
1. Turn your device off.
2. Plug the power lead (of SINEC-L2 components or MPI connecting cable) onto
the MPI/DP socket of your computing unit and secure the connector by
tightening the screw-type lock.
3. Turn your computing unit on.
Caution
Danger of damage being caused to the device
Always discharge your body’s charge before inserting power leads and connecting
cables by briefly touching a grounded object (ESD Guidelines).
MPI/PROFIBUS-DP network
Up to 32 devices (computing units, programming devices, PLCs or DP
components) can be interconnected to form a network segment. The physical
connection to the PROFIBUS-DP network is via an isolated *) RS458 interface,
which is an integral part of the interface.
Several PROFIBUS-DP network segments can be connected via repeaters.
The complete PROFIBUS-DP network can consist of up to 127 nodes. The data
transfer rate on the MPI network is 187.5 kbaud, whereas on the PROFIBUS-DP
network data transfer rates of 9.6 kbaud to 1.5 Mbaud are supported by the
MPI/DP interface.
Note
You will find information on how to configure a PROFIBUS-DP network in the
manual ”Programmable Controller S7-300, Configuration, CPU Data” Order No.
6ES7 398-8AA03-8AA0.
*) Isolated within the safety extra-low voltage circuit SELV