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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
5-34
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Table 5-15
MPI addresses of CPs/FMs in an S7-300
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CP
SF
BUSF
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RUN
STOP
CP
CPU
SM
Example:
An S7-300 CPU and 2 CPs in one unit.
You have two options for assigning MPI
addresses of CPs/FMs installed in one
unit:
CPU CP
CP
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The CPU adopts the CP
MPI addresses you specify in STEP 7.
MPI address
MPI
address
+x
MPI
address.
+y
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The CPU automatically
determines the MPI addresses of the CPs
in their configuration as follows: MPI
address of CPU; MPI a1; MPI
a2.
(Default)
MPI address
MPI
address
+1
MPI
address
+2
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This CPU uses only one MPI address,
including the CPs connected.
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Reserve MPI address “0“ for a service PG or “1“ for a service OP. You can later
connect them temporarily to the subnet. Also, assign other MPI addresses to
PGs/OPs operating on the MPI subnet.
Recommended MPI address for the CPU in case of replacement or service:
Reserve MPI address “2” for the CPU. This prevents duplication of MPI addresses
after you connect a CPU with default settings to the MPI subnet (for example,
when replacing a CPU). That is, you must assign an MPI address greater than “2”
to CPUs on the MPI subnet.
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Reserve PROFIBUS address “0” for a service PG that you can subsequently
connect briefly to the PROFIBUS subnet if required. Therefore, assign unique
PROFIBUS addresses to PGs integrated in the PROFIBUS subnet.
