Multipoint Interface (Mpi) - Siemens SIMATIC S7-400H System Manual

5.8

Multipoint interface (MPI)

Connectable devices
You can, for example, connect the following nodes to the MPI:
● Programming devices (PG/PC)
● Operating and monitoring devices (OPs and TDs)
● Additional SIMATIC S7 PLCs
Various compatible devices take the 24 V supply from the interface. This voltage is non-isolated.
PG/OP - CPU communication
A CPU is capable of handling several online connections to PGs/OPs in parallel. By default,
one of these connections is always reserved for a PG, and one for an OP/operation and
monitoring device.
CPU–CPU communication
CPUs exchange data by means of S7 communication.
For further information, refer to the
Connectors
Always use bus connectors with an angular cable exit for PROFIBUS DP or PG cables to
connect devices to the MPI (see
MPI interface as DP interface
You can also configure the MPI interface for operation as DP interface. To do so, reconfigure
the MPI interface under STEP 7 in SIMATIC Manager. This feature can be used to configure
a DP segment with up to 32 slaves.
S7-400H
System Manual, 09/2007, A5E00267695-03
Programming with STEP 7
Installation Manual
, Chapter 7).
Installation of a CPU 41x–H
5.8 Multipoint interface (MPI)
manual.
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