Technical data

Tips and Tricks
26.7 Virtual Work Memory
Programming with STEP 7
Manual, 05/2010, A5E02789666-01 555
26.7 Virtual Work Memory
Another reason for problems occurring in STEP 7 may be insufficient virtual work memory.
To work with STEP 7 you should adjust the setting for the virtual memory. Proceed as follows:
1. Open the Control Panel, for example, via the Start menu Start > Settings > Control Panel and
double-click on the icon "System".
2. In the dialog box that opens, select the "Advanced" tab and click the "Settings" button in the
"System Performance" area.
3. Select the performance options in the "Advanced" tab and click the "Change" button.
4. Enter at least 40 Mbytes as the "Minimum" and at least 150 Mbytes as the "Maximum."
Note
As the virtual memory is on the hard disk (default C:) and dynamic, you should ensure that sufficient
memory is available for the directory TMP or TEMP (approx. 20 to 30 Mbytes):
• If the S7 project is also on the same partition on which the virtual memory is set, approximately twice the size
of the S7 project should be available as free memory space.
• If the project is stored on another partition, this requirement becomes irrelevant.
Adapting the virtual work memory in MS Windows 7
If the virtual work memory on your PC was modified manually, follow the steps below:
1. Open the Control Panel, for example from the Start menu with Start > Control Panel and
double-click on the "System" icon.
2. Double-click on "Security and System" and select the "Advanced System Settings" entry and
click on "Settings" in the "Performance" section of the displayed dialog.
3. Click the "Change" button in the "Advanced" tab.
4. Select the option "Automatically manage paging file size for all drives".