Configuring
8.1 Configuring the CPU
Automation system
System Manual, 01/2023, A5E03461182-AK
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8.1.2 Address assignment
8.1.2.1 Addressing - overview
Introduction
In order to address the automation components or modules, they must have unique
addresses. The following section explains the various address areas.
I/O address
I/O addresses (input/output addresses) are required in the user program to read inputs and
set outputs.
STEP 7 automatically assigns input and output addresses when modules are configured. Each
module uses a continuous range of input and/or output addresses corresponding to its
volume of input and output data.
Figure 8-5 Example with input / output addresses from STEP 7
STEP 7 assigns the address areas of the modules by default to the process image partition 0
("Automatic updating"). This process image partition is updated in the main cycle of the CPU.
Device address (e.g., Ethernet address)
Device addresses are addresses of modules with interfaces to a subnet (e.g., IP address or
PROFIBUS address). They are required to address the various devices on a subnet, for
example, to download a user program.
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