Mpi Address - Siemens SIMATIC ET 200S Manual

5.2

MPI address

Features
With the MPI address, you determine the address under which the IM 151-7 CPU
is accessed in the MPI network.
Prerequisites
S The permitted MPI addresses are 0 to 126.
S Each address can be allocated only once on the MPI network.
Recommendations for MPI addresses
S Assign MPI addresses greater than "2" to the fixed nodes in the MPI network.
S Reserve the MPI address "0" for a service PD and "1" for a service OP which, if
necessary, can be connected to the MPI network at short notice.
S Reserve the MPI address "2" for a CPU. This prevents double MPI addresses
occurring when a CPU with default settings is installed in the MPI network (e.g.
when a CPU is exchanged).
Startup without configuration on the Micro Memory Card (MMC) (initial startup)
Following POWER ON, the coexistent interface on the IM 151-7 CPU powers up
as an MPI interface with the address 2, HSA 31 and 187.5 kBaud. All PD functions
listed in Section 4.4 are possible with the interface.
Note
The bus parameters are retentive, i.e. bus parameters that have been configured
(e.g. address, transmission rate) are retained
S
with POWER OFF
S
if there is no longer a configuration on the IM 151-7 CPU (e.g. after SDBs have
been deleted or following POWER ON without MMC)
Startup with configuration on the Micro Memory Card (MMC)
As soon as a configuration has been downloaded to the IM 151-7 CPU, the data
stored on the MMC is used on startup.
ET 200S IM 151-7 CPU Interface Module
A5E00058783-04
ET 200S in the MPI Network
5-3