Used to protect specific blocks (FC, FB). It allows the code to run but prevents users from viewing or editing the logic. Method 1: The MMC Reset (The "Clean Slate" Approach)

If you have a different S7-300 model, inserting the MMC into it will cause a configuration mismatch. You can then use the MRES procedure on that CPU to force a reset of the card. 2. Password Recovery (Keeping the Program)

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