Siemens Simatic S7-300, Hardware And Installation Manual, Page: 59 / 242

Configuring
S7-300 Programmable Controller Hardware and Installation
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On the PG you can specify individual MPI/PROFIBUS addresses for each one of
the nodes (on some of the PROFIBUS-DP slaves this is also possible per selector
switch).
Default MPI/PROFIBUS-DP addresses
The table below shows you the factory setting of the MPI/PROFIBUS-DP
addresses and the highest default MPI/PROFIBUS-DP addresses for the devices.
Table 4-12 MPI/PROFIBUS-DP addresses
Node
(device)
Default
MPI/PROFIBUS-
DP address
Default highest MPI
address
Default highest
PROFIBUS-DP address
PG 0 32 126
OP 1 32 126
CPU 2 32 126
Rules: Assigning MPI/PROFIBUS-DP addresses
Note the following rules before assigning MPI/PROFIBUS addresses:
•
All MPI/PROFIBUS addresses in a subnet must be unique.
•
The highest MPI/PROFIBUS address must be
≥
of the physical
MPI/PROFIBUS address, and it must be identical for each node. (Exception:
Connecting a PG to multiple nodes; refer to the next Chapter).
Differences in the case of MPI addresses of CPs/FMs in an S7-300
Table 4-13 MPI addresses of CPs/FMs in an S7-300
Options Example:
CPU CP
SF
BUSF
DC5V
FRCE
RUN
STOP
CP
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
First option: The CPU adopts the CP
MPI addresses you specify in STEP 7. MPI address MPI
address
+x MPI
address.
+y
Second option: The CPU automatically
determines the CP MPI addresses in your
configuration according to the following
pattern: MPI address CPU; MPI address
+1; MPI a2.
(Default)
MPI address MPI
address
+1 MPI
address
+2