Assembling the M7-400
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S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
Permanently-Installed Programming Device in the MPI subnet
The programming device permanently installed in the MPI subnet should be
connected directly via bus connectors to the other nodes of the MPI subnet,
according to the rules in Chapter 5.
Figure 8-18 shows an M7-400 subnet with two M7-400s. They are interconnected
via bus connectors.
PROFIBUS-DP bus cable
M7-400
M7-400
Programming
device
PROFIBUS-DP bus cable
Figure 8-18 Connecting a Programming Device to Two or More M7-400s
Connecting a Programming Device for Servicing
If no stationary programming device is present, we recommend the following:
To connect a programming device to an MPI subnet with “unknown” node
addresses for servicing, set the following address on the service programming
device:
MPI address: 0
Highest MPI address: 126.
Then determine, via
M7 Configuration
, the highest MPI address in the MPI subnet
and adjust the highest MPI address in the programming device to that of the MPI
subnet.
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