Siemens SIMATIC S7-400 Installation Manual page 102

Networking
Number of Nodes
1 PG port (reserved)
Observe the CPU-specific maximum numbers in the Reference Manual CPU Data
*
MPI/PROFIBUS-DP Addresses
In order for all nodes to be able to communicate with one another, you must assign
them an address:
• In the MPI network, an MPI address
• A PROFIBUS-DP address in the PROFIBUS-DP network
Default MPI Addresses
The following table shows the default MPI address and the max. MPI address with
which the devices are shipped:
Node (Device)
Programming device
Note
If you change the parameter assignment of the highest MPI address of the MPI/DP
interface, the new address remains set even after memory reset, voltage failure or
removing/inserting the CPU.
5-4
MPI
127
(default: 32)
Default MPI Address
OP
CPU
PROFIBUS DP
of which: 1 master (reserved)
1 PG port (reserved)
125 slaves or other masters
0
1
2
Automation System S7-400 Hardware and Installation
127 *
Default Highest MPI
Address
31
31
31
A5E00850741-01