To properly manage or "format" a Siemens Micro Memory Card (MMC), you must use Siemens-specific hardware and software
Routine maintenance and clearing old PLC projects. 2. TIA Portal siemens mmc card format tool
An MMC is not just a storage device; it's the boot device. When you format a card, it is empty. If you plug an empty card into an S7-300 CPU, the CPU has no hardware configuration. It will likely go into STOP mode or report a configuration mismatch. To properly manage or "format" a Siemens Micro