Configuring
4.2 Configuring the CPU
CPU 1516pro-2 PN (6ES7516-2PN00-0AB0)
36 Operating Instructions, 09/2016, A5E35873416-AA
Address assignment
4.2.2.1
Addressing - overview
Introduction
In order to address the automation components or modules, unique addresses must be
assigned to them. The various address areas are explained below.
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 4-1 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).
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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