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

Configuring

9.6 Address assignment

9.6 Address assignment
9.6.1

Addressing

Introduction
The automation components and onboard I/O must have unique addresses so that they can
be addressed. 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.
The same applies for the onboard I/O of the SIMATIC Drive Controller.
Figure 9-7 Automatic assignment of input/output addresses of interface X142 by 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.
Note
If you have interconnected the X142 digital input/outputs with the technology object
measuring input, output cam or cam track, isochronous mode and assignment to the process
image partition OB servo are essential.
The setting is made automatically as soon as you interconnect a digital input or digital output
with a corresponding technology object.
154
SIMATIC Drive Controller
System Manual, 11/2023, A5E46600094-AD