Mpi And Profibus-Dp Interface; Cpu Interfaces - Siemens SIMATIC S7-300 Series Reference Manual

1.1.5

MPI and PROFIBUS-DP Interface

Table 1-4

CPU Interfaces

CPU 312 IFM
CPU 313
CPU 314IFM
CPU 314
MPI interface MPI interface
MPI
- -
MPI interface
The MPI is the interface of the CPU for the programming device/OP and for
communication in an MPI subnet.
Typical (default) transmission speed is 187.5 Kbps (CPU 318-2: adjustable up to
12 Mbps).
Communication with an S7-200 requires 19.2 Kbps.
The CPU automatically broadcasts its set bus parameters (e.g. baud rate) at the
MPI interface. This means that a programming device, for example, can
automatically "hook up" to an MPI subnet.
PROFIBUS-DP Interface
CPUs equipped with 2 interfaces provide a PROFIBUS-DP interface connection.
Transmission rates up to 12 Mbps are possible.
The CPU automatically broadcasts its set bus parameters (e.g. baud rate) at the
PROFIBUS-DP interface. This means that a programming device, for example,
can automatically "hook up" to a PROFIBUS subnet.
In Step 7 you can switch off automatic transfer of bus parameter.
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
CPU 315-2DP
CPU 316-2DP
PROFIBUS-DP
interface
MPI DP
-
CPU 318-2
MPI/DP Interface PROFIBUS-DP
interface
MPI/ DP
DP
Reconfiguration as -
a PROFIBUS-DP
interface is
possible
CPUs
1-7