Nodes On The Subnet; Mpi/Profibus Dp Addresses - Siemens SIMATIC S7-300 Hardware And Installation Manual

Number of nodes
Maximum possible number of nodes per subnet:
Table 5-11
Parameters MPI
Number
Addresses
Remarks
1) Note the CPU-specific maximum specifications in the CPU manual.

MPI/PROFIBUS DP addresses

To ensure that all nodes can intercommunicate, you must assign them an address:
• In the MPI network: an "MPI address"
•
In the PROFIBUS DP network: a "PROFIBUS DP address"
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 5-12
Node
(device)
PG
OP
CPU
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02

Nodes on the subnet

127
0 to 126
Default: 32 addresses
Reserved are:
•
address 0 for PG
•
address 1 for OP
MPI/PROFIBUS DP addresses
Default Default highest MPI
MPI/PROFIBUS
DP address
0
1
2
PROFIBUS DP
1)
126
0 to 125
of those:
•
1 Master (reserved)
•
1 PG connection
(address 0 reserved)
•
124 slaves or other
masters
Default highest
address PROFIBUS DP address
32
32
32
Configuring
PtP
2
-
-
126
126
126
5-37