Siemens S7-1500 Function Manual page 21

Memory areas and retentive memory
2.2 Memory requirements and memory usage
For a CPU, you can select the total size of the load memory in a drop-down list. Select the
size of the load memory in accordance with the size of the SIMATIC memory card you are
using. The percentage shown in the Load memory column depends on the selected size of
the load memory. As soon as the memory size exceeds the size of the load memory of the
memory card you are using, the sizes indicated turn red.
Note
Determination of the memory utilization
Note that the SIMATIC memory card also contains data other than the user program that you
cannot determine using "Resources". This data includes:
• Hardware configuration
• Recipes, data logs and HMI backups (not supported for S7-1500R/H)
• Non-SIMATIC files, such as PDF, etc.
Therefore, the drop-down list with the size of your SIMATIC memory card only serves as a
visual orientation aid.
Also refer to the FAQ "How do you estimate the memory requirements of your project in the
load memory of a SIMATIC S7-1500" on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/97553417).
Note
Display of the memory utilization under "Program info"
The display of the memory utilization in the program information is an offline display in
STEP 7 and only shows the memory requirements of the program in the project. The
program on the memory card of the CPU may differ, however, e.g. if the program:
• is more up to date
• contains blocks generated by other projects
• contains blocks generated on the CPU
20
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC