How to Delete the Siemens CPU Memory?

In this article, we will learn about a method to delete a CPU memory in the PLC.

When you use a selector switch on the CPU of the PLC you must know what it reset within a memory.

When you reset or delete a memory, it only deletes a memory variable values and not whole memory.

Delete Siemens CPU Memory

To reset the memory first put your CPU into the STOP mode.

Now, move your selector switch to “MRES” mode and keep it till the STOP LED starts to blink.

As LED stops to blink, put your CPU into the STOP mode again.

You have successfully reset the memory.

But as you know that it only deletes memory variable values and not whole memory.

To delete the whole memory, do follow the below steps.

Step 1:

Open TIA PORTAL or Simatic Manager. Open Block section.

Open TIA PORTAL or Simatic Manager

Step 2:

To delete it hit ctrl + A on your keyboard. Uncheck system data. Click on “delete”.

Delete Siemens CPU Memory

Step 3:

Hit “yes” to delete.

Siemens Memory Card Delete

Step 4:

The whole memory is deleted now which you can confirm by looking at the block window.

CPU Memory Reset

Author: Suhel Patel

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