Siemens S7-1500 Function Manual page 20

Memory requirements of the program in the offline project
During creation or modification of a project, the display of memory utilization in STEP 7
shows you the size of the project in the following memories:
● Load memory
● Work memory
● Retentive memory
You can find this information for the CPU under "Program info" in the project tree,
"Resources" tab.
● Total size of the memory areas of the respective CPU project (in the figure below line
"Total:")
● Memory requirements of the program elements (blocks, data types, objects for motion
technology and PLC tags)
● Memory amounts in the respective memory area of the offline project (in figure below, line
"Used:")
● Used inputs and outputs
The following figure shows an overview of the utilization of the various memory areas of the
"Resources" tab:
Figure 2-2 Display of the utilization of the various memory areas
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Memory areas and retentive memory
2.2 Memory requirements and memory usage
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