Siemens S7-1500 Function Manual page 38

Memory requirements in STOP state
Even when downloading in STOP state, a certain amount of reserve memory is required,
because your CPU needs sufficient free memory on the memory card for consistent
downloading of individual data blocks. The files affected by loading the data blocks are only
deleted after the new files have been created. Therefore, for the modifications you must
have available at least the memory requirement of the largest data block.
If insufficient reserve memory is available on your SIMATIC memory card when loading in
STOP state, the following message is displayed in STEP 7 during the download to the CPU:
"There is insufficient memory on the memory card for this amount of data."
In order to still enable the loading of changes to the CPU in such a case, we recommend one
or more of the following options:
● Delete any files no longer required (e.g. CSV files, panel backups, etc.) from the memory
card using the Web server.
● Use a larger memory card. A description of how to change the memory card can be found
in the section "Changing the memory card without loss of retentive data".
Note
Please note that retentive data and possibly also project data is lost with the following three
options. Therefore only use the following options described if the two options described
previously did not lead to the desired result.
● In STEP 7, download your program to the CPU with menu command "Online > Download
and reset PLC program".
● Remove the memory card from the slot of the CPU. Delete the content that is longer
needed from the memory card with your programming device.
● Delete the entire contents, e.g. by formatting the memory card. A description of how to
format the memory card can be found in the section "Formatting a SIMATIC memory
card".
Note also the following FAQs:
● "When downloading to the S7-1500 CPU, why is the message "There is insufficient
memory on the memory card for this amount of data" displayed although there is still
enough memory available?" on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/107108015).
● "Why can you not load the project data into the load memory of the S7-1500 CPU when
the number of alarms and messages is too large?" on the Internet
(https://support.industry.siemens.com/cs/ww/en/view/109751485).
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
2.6 Memory requirements for downloading software changes
Memory areas and retentive memory
37