Connecting A Programming Device To Two Or More M7-400S - Siemens S7-400 Installation Manual

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.
Figure 8-18
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.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
M7-400
PROFIBUS-DP bus cable
PROFIBUS-DP bus cable

Connecting a Programming Device to Two or More M7-400s

Assembling the M7-400
Programming
device
M7-400
8-41