To , you must either perform a hardware memory reset to wipe the controller for reuse, or use an external card reader with specialized software to extract the password from the Micro Memory Card (MMC) without losing your program.
Store unencrypted master project files on a secure corporate server.
在程序中预先比较 MMC 卡的序列号，若序列号不一致则停止 PLC 运行，防止程序被非法复制到另一台设备。
适合场景：设备处于关键生产线，要求最小停机风险和绝对安全。通过西门子官方渠道操作，但需提供所有权证明且费用较高。 unlock s7300 plc password hot
Older S7 communication protocols transmit or store password tokens in the CPU’s temporary RAM in plaintext or weak obfuscation during an active engineering session.
A Windows PC equipped with a built-in or specialized SD/MMC card reader slot.
Slide this newly provisioned card into the unpowered PLC. Turn the physical run switch to the position while flipping the master power toggle on. The system will overwrite its internal protected memory space with the unencrypted project structure. Legal and Operational Risks To , you must either perform a hardware
If you need to access the logic without deleting it, these methods involve extracting the password from the Micro Memory Card (MMC). MMC Imaging Software : This is the most common "unofficial" fix.
I can provide the exact software scripts or software tools needed for your situation. Share public link
If you do not need to save the existing program and simply want to reuse the PLC, you can perform a factory reset using the physical switch on the CPU. This removes the password by completely wiping the memory. the S7-300 CPU. A Windows PC equipped with a built-in or
Use a low-level memory access script or specialized password recovery executable.
Users can read data and download blocks from the PLC, but cannot modify the running program without a password.
Using a to access and delete the program directly from the card.
If you do not need the original program, you can perform a hardware reset using the MRES switch to wipe the memory and start fresh. Manufacturer Support: