Siemens Simatic M7-400 Reference Manual page 473

Programmable controllers module specifications
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Behavior on the S7-400 Backplane Bus
The expansion modules can be accessed via the relevant programmable module
and not via the S7-400 backplane bus.
e.g. FM 456-4
Figure 12-1 Positions of Expansion Socket and Expansion Connector
Maximum Expansion
Figure 12-2 shows the maximum possible expansion using expansion modules for
a CPU 486-3, CPU 488-3, or FM 456.
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Expansion
connector
Expansion
socket
M7-400 Expansions
e.g. EXM 478
12-3

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