Siemens SIMATIC ET 200pro - Address Assignment; Addressing - Overview

Configuring
5.2 Configuring the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
Operating Instructions, 11/2019, A5E35873416-AC
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Reference
You can find additional information on configuring the CPU / I/O modules and the individual
settings in the STEP 7 online help.
5.2.2 Address assignment
5.2.2.1 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 5-5 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).
They are required to address the various devices on a subnet, for example, to download a
user program.