Address Assignment; Addressing - Overview - Siemens SIMATIC S7-1500 System Manual

Configuring
6.1 Configuring the CPU
6.1.2

Address assignment

6.1.2.1

Addressing - overview

Introduction
In order to address the automation components or I/O modules, unique addresses must be
assigned to them. The various address areas are explained below.
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 6-5 Example with input / output addresses from STEP 7
The address areas of the modules are assigned 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 in order to address the various devices on a subnet,
e.g., in order to download a user program.
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Automation system
System Manual, 09/2016, A5E03461182-AD