Networking
5-4 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01
Number of NodesMPI PROFIBUS DP
127 127 *
(default: 32) of which: 1 master (reserved)
1 PG port (reserved) 1 PG port (reserved)
125 slaves or other masters
*Observethe CPU-specific maximum numbers in the Reference Manual CPU Data
MPI/PROFIBUS-DP AddressesIn 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 AddressesThe following table shows the default MPI address and the max. MPI address with
which the devices are shipped:
Node (Device) DefaultMPI Address DefaultHighest MPI
Address
Programming device 031
OP 131
CPU 231
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.