Siemens Simatic M7-400 Reference Manual page 478

M7-400 Expansions
Numbering of the Submodule Receptacles
Each receptacle (slot) for an interface submodule has a submodule receptacle
number assigned to it. The submodule receptacle number depends on the
configuration of your CPU or FM. The submodule slot numbers are shown in
Figures 12-4 and 12-5.
You require these submodule receptacle numbers for configurations that you make
in the BIOS setup or to determine the I/O addresses of an interface submodule.
Slot
Figure 12-4
12-8
FM 456-4 EXM 478
3
0
4
1 5
n n+1
Submodule Receptacle Numbers for the FM 456-4 and EXM 478
S7-400, M7-400 Programmable Controllers Module Specifications
6 9
7 10
8 11
n+2 n+3
A5E00069467-07