Mpi Addresses Of Cps/Fms In An S7-300 - Siemens CPU 313C Hardware And Installation Manual

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Table 5-15
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:
)LUVW RSWLRQ The CPU adopts the CP
MPI addresses you specify in STEP 7.
6HFRQG RSWLRQ The CPU automatically
determines the MPI addresses of the CPs
in their configuration as follows: MPI
address of CPU; MPI address +1; MPI
address +2.
(Default)
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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.
5-34

MPI addresses of CPs/FMs in an S7-300

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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BUSF
CPU CP
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RUN
STOP
CPU CP
MPI address MPI
address
+x
MPI address MPI
address
+1
This CPU uses only one MPI address,
including the CPs connected.
CP
SM
CP
MPI
address.
+y
MPI
address
+2
A5E00105492-03