Siemens SIMATIC S7-400 Hardware And Installation Manual page 202

Assembling the M7-400
Interconnecting Modules
Take the CPU and first expansion module, position them on a level surface and
press them carefully together so that all pins of the expansion module plug are
precisely inserted into the CPU socket.
Then plug the other modules successively into the assembled group (see
Figure 8-8).
e. g. CPU 488-3
Figure 8-8 Interconnecting a CPU and Expansion Modules
Note
Note that there are rules on the number of connectable expansion modules and on
the sequence of the modules following the CPU. These rules are listed in the
Reference Manual under the chapter on M7-400 expansion.
This completes all the expansion on the ISA bus of the CPU (see Figure 8-9).
8-20
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e. g. EXM 478
e. g. MSM 478
1.
2.
S7-400 and M7-400 Programmable Controllers, Installation Manual
e. g. ATM 478
3.
Level surface
C79000-G7076-C424-01