If your goal is to reclaim the hardware so you can download a new program, use the default software reset tool. This approach strips the forgotten password along with all existing logic blocks. Step-by-Step Reset Protocol
~85% for firmware ≤ v2.8. CPUs with firmware v2.9+ have patched this.
Newer S7-200 SMART PLCs feature upgraded hardware architectures and reinforced chip encryption. Writing a modified or patched hex file to the system storage frequently causes permanent boot loops.
当密码遗忘且无法通过常规方式获取时，西门子官方提供了两种标准的密码清除方法：
: You can use the Wipeout.exe executable to reset the PLC to factory settings . This utility deletes the user program, data blocks, and configuration, and resets the baud rate to 9.6 kbit/s . PLC Menu Clear : Connect to the PLC and go to the PLC menu . s7 200 smart plc password unlock new
If you can provide the exact CPU model and whether you have access to the software, I can tailor the instructions to your situation.
Outside of Siemens' official methods, third-party tools have emerged, primarily designed to remove passwords from offline .smart project files rather than hacking into a live, locked PLC. Their goal is to allow users to open a password-protected project in the programming software without knowing the password.
In the early days of the S7-200 SMART, there were various software exploits and "hack tools" circulating on automation forums. However, Siemens has released firmware updates that patch many of these vulnerabilities.
If you’re locked out of a production machine and need immediate recovery, I strongly advise contacting or the OEM who supplied the equipment. Attempting unofficial unlock methods risks corrupting the firmware or violating safety regulations. If your goal is to reclaim the hardware
The procedure uses the "Clear" function in the STEP 7-Micro/WIN SMART software:
30 seconds – 2 minutes.
The S7-200 SMART uses a multi-tiered password system:
To unlock the PLC without losing the existing program, specialized third-party tools are often required, as Siemens does not provide a way to bypass security without a reset . Backup the program from a password protected plc s7-200. CPUs with firmware v2
To avoid this situation in the future, implement the following protocols:
: When the software asks for the authorization password to complete the clear function, type CLEARPLC into the password input box. This system keyword is not case-sensitive and bypasses the old password by initiating a complete hardware format.
Selecting all blocks ensures that the old hardware configuration and security settings are fully initialized. Click or Clear to execute the command. 4. Format via MicroSD Card (Alternative Method)
Do you need to retrieve the , or just reuse the physical hardware ? Share public link