Addressing - Siemens CPU 313C Hardware And Installation Manual

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shows you the options for addressing specific module channels.
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Slot-based addressing is the default setting, that is, 67(3  assigns each slot
number a defined module start address.
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With user-defined addressing, you can assign any module address from the
address area managed by the CPU.
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In slot-based addressing (default addressing), a module start address is allocated
to each slot number This is a digital or analog address, depending on the type of
module. This section shows you which module start address is assigned to which
slot number. You need this information to determine the start addresses of the
installed modules.
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The figure below shows you an S7-300 assembly on four racks and the optional
slots with their module start addresses.
The input and output addresses for I/O modules start from the same module start
address.
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With the CPU 31xC, you cannot insert any modules in Slot 11 of Rack 3. The
address area is reserved for the integrated I/O.
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03

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