Technical data

Downloading and Uploading
19.5 Compressing the User Memory (RAM)
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 439
19.5.2 Compressing the Memory Contents of an S7 CPU
Ways of Compressing the Memory
There are two methods of compressing the user memory, as follows:
• If there is insufficient memory available when you are downloading to the programmable
controller, a dialog box appears informing you of the error. You can compress the memory by
clicking the corresponding button in the dialog box.
• As a preventative measure, you can display the memory utilization (menu command PLC >
Diagnostics/Setting > Module Information, "Memory" tab) and start the compressing
function if required.
Procedure
1. Select the S7 program in the "Accessible Nodes" window or the online view of the project.
2. Select the menu command PLC > Diagnostics/Setting > Module Information.
3. In the dialog box which then appears, select the "Memory" tab. In this tabbed page there is a
button for compressing the memory if the CPU supports this function.