S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
7-1
7Addressing
7
7.1 Addressing
In this chapter
shows you the options of addressing specific module channels.
Slot-based addressing
Slot-based addressing is the default setting, that is, STEP 7 assigns each slot
number a defined module start address.
User-defined addressing
With user-defined addressing, you can assign any module address from the
address area managed by the CPU. User-defined addressing for S7-300 PLCs is
only possible with CPUs 315, 315-2 DP, 316-2 DP and 318-2 DP as well as
CPUs 31xC.
7.2 Slot-defined addressing of modules
Introduction
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.
Maximum assembly and the corresponding module start addresses
The figure below shows you an S7-300 assembly on four module 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.
Note
With CPU 314 IFM and CPUs 31xC you cannot insert a module in module rack 3,
slot number 11. The address area is reserved for the integrated I/O.
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