Example: Maximum Distance In The Mpi Subnet - Siemens S7-300 Installation Manual

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The figure below shows you:
• a possible MPI Subnet configuration
• maximum distances possible in an MPI subnet
• the principle of "Line extension" using RS485 repeaters
S7-300
3
PS CPU CPU
OP 27
MPI addr. 3
MPI addr. 4
1
S7-300
3
PS
OP 27
MPI addr. 11
1
Figure 5-15 Example: Maximum distance in the MPI subnet

Terminating resistor inserted

PG connected by means of a stub cable for maintenance purposes
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00203919-01
S7-300
3 3
PS CPU CPU
MPI addr. 5
2
PG
MPI addr.
max. 50 m
CPU CPU
OP 27
MPI addr. 9
MPI addr. 10
max. 50 m
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S7-300
PG
PS CPU CPU
MPI addr. 6 MPI addr. 7
S7-300
3
PS CPU CPU
MPI addr. 8
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1
RS 485-
Repeater
1
max. 1000 m
1
RS 485-
Repeater
1
5-45