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Siemens Simatic S7-400 User Manual

Page 473

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M7-400 Expansions

12-3

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

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

e.g. EXM 478

Expansion
socket

Expansion
connector

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.

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