Parameters; Process Images And Process Image Partitions; Process Image - Overview - Siemens SIMATIC S7-1500 System Manual

Configuration

8.9 Process images and process image partitions

8.8

Parameters

"Parameter assignment" means setting the module properties. This includes setting
addresses, enabling alarms and defining communication properties.
You assign the property parameters for the CPUs in the area navigation, in the STEP 7
Inspector window. The CPUs have general parameters and R/H-specific parameters. Some
parameters must be identical for both CPUs. STEP 7 applies these parameters to the second
CPU. Other parameters must be different on each CPU (for example device IP addresses). If
your configuration is not consistent, STEP 7 will point out the conflict.
Reference
You can find a detailed description of all CPU parameters in the STEP 7 online help.
8.9 Process images and process image partitions
8.9.1

Process image - overview

Process image inputs and outputs
The process image of the inputs and outputs is an image of the signal states. The CPU
transfers the values from the input and output modules to the process image inputs and
outputs. At the start of the cyclic program, the CPU transfers the process image output as a
signal state to the output modules. The CPU then transfers the signal states of the input
modules to the process image inputs.
Advantages of the process image
A consistent map of the process signals is available via the process image during cyclic
program execution. If a signal state at an input module changes during program execution,
the signal state is retained in the process image. The CPU does not update the process image
until the next cycle.
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The CPU in the lower section of the project tree has the
redundancy ID "2". The properties of the CPU are displayed
below it.
The IO devices assigned to the CPU are listed under "Distrib­
uted I/O".
All distributed I/O devices used are listed under "Ungrouped
devices".
System Manual, 11/2022, A5E41814787-AD
S7-1500R/H redundant system