Configuration Of An Mpi Network - Siemens SIMATIC S7-400 Configuration And Use Manual

Simple Access to all Modules
The multi-point interface enables central access to all programmable modules
within a configuration. Additional cabling is not required, for example, in order to
access the data of a CP from a programming device.
Maximum Distance
The distance between the communication partners is determined by the length of
the cable. The total length of cabling is 50 m maximum without signal amplification.
You need an RS 485 repeater as a signal booster to bridge greater distances. For
example, with two RS 485 repeaters, you can bridge a distance of 1100 m between
communication partners. Additional RS 485 repeaters enable even greater
distances.
In Figure 5-2 you can see an example of a MPI network configuration with greatest
possible distances for an MPI network.
S7-400
OP
3
OP
11
Terminal resistor on
Programming device connected via spur line for maintenance purposes
0 ... x MPI addresses of the stations
Figure 5-2

Configuration of an MPI network

Components for Communication via the MPI Interface
You can use the network components of PROFIBUS DP to configure a network
using the MPI interface.
Automation System S7-400 Configuration and Use
A5E00442711-02
Interfaces, Networks and Data Communication for the S7-400
S7-400 S7-400
4 5
Spur line
PG*
0
Max. 50m
S7-400
OP
10
Max. 50m
PG*
6 7
S7-400
9 8
RS 485
repeater
Max.
1000m
RS 485
repeater
5-5