Example Of An Mpi Subnet - Siemens S7-300 Installation Manual

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The figure below shows you the block diagram of an MPI subnet.
S7-300
2
SF SF
BUSF BUSF
DC5V DC5V
FRCE FRCE
RUN RUN
STOP STOP
PS CPU
OP 27
MPI addr. 2 MPI addr. 1
1
S7-300
3
PS CPU CPU
MPI addr. 13
1
5
MPI addr. 0
PG
Figure 5-14 Example of an MPI subnet

Terminating resistor inserted

S7-300 and OP 27 have subsequently been connected to the MPI subnet using their MPI default
address.

With CPU 318-2 DP, a separate MPI address is not assigned to CPs or FMs. With S7-300 CPUs (without
CPU 318-2 DP). you can also freely assign MPI addresses for the CPs/ FMs.

In addition to the MPI address, the CP also has a PROFIBUS address (7 in this case).

Connected via a stub cable using the default MPI address for commissioning/maintenance only
5-44
S7-300
S7-300
3 3
PS CPU CPU PS
2
MPI addr. 3
S7-300
3
PS CPU CPU
OP 27
MPI addr. 12 MPI addr. 11
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
S7-300
3
PG
PS
CPU CPU
MPI addr. 4 MPI addr. 5 MPI addr. 6 MPI addr. 7
S7-300
3
PS
OP 27
MPI addr. 10
3
CP
CPU CPU
PROFIBUS
3
FM
CPU CPU
MPI addr. 8 MPI addr. 9
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