Standard operating system formatting (FAT32, NTFS) will a Siemens MMC, making it unusable in a PLC environment. A standard PC card reader can often read the data, but attempting to "Format" via Windows Explorer destroys the hidden system image Siemens uses to identify the card to the CPU. Authorized Methods to Format or Reset a Siemens MMC
If you want to clear the program but keep the card's integrity: siemens mmc card - Support
Instead of a third-party "format tool," use the following built-in methods provided by Siemens software and hardware: 1. Hardware Reset via CPU ( Go to product viewer dialog for this item. siemens mmc card format tool
Release the switch and immediately (within 3 seconds) flip it back to .
The STOP LED will blink while the MMC is being "reset" to its factory-delivered state. 2. TIA Portal "Format Memory Card" ( Go to product viewer dialog for this item. Standard operating system formatting (FAT32, NTFS) will a
This is the most common way to clear a card when you don't have a PG/PC connection: Insert the MMC into the slot.
Confirm the prompt. Note: The CPU must be in to complete this action. 3. SIMATIC Manager "Delete Blocks" ( Hardware Reset via CPU ( Go to product
Hold the switch to the position for roughly 9 seconds until the STOP LED lights up continuously.
For newer controllers, the TIA Portal Engineering Software provides a dedicated tool: Go to for the connected CPU. Expand the Functions folder in the project tree. Select Format memory card and click the Format button.