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How to Unlock Password of Siemens S7-200 PLC



How to Unlock Password of Siemens S7-200 PLC




If you have forgotten the password of your Siemens S7-200 PLC, you might be wondering how to crack it and access your program. In this article, we will show you some possible ways to unlock the password of your PLC using different tools and methods.




Simatic s7 200 plc password crack



Before we start, you should know that cracking the password of a PLC is not an easy task and it may require some technical skills and equipment. Also, cracking the password may void the warranty of your PLC or cause damage to your device. Therefore, you should proceed with caution and at your own risk.


What is Siemens S7-200 PLC?




Siemens S7-200 PLC is a programmable logic controller that belongs to the SIMATIC S7 family of Siemens. It is a small and compact device that can be used for various automation tasks in industrial applications. It has a built-in CPU, memory, input/output ports, and communication interfaces. It can be programmed using STEP 7 Micro/WIN software or other compatible software.


Why do you need to crack the password of Siemens S7-200 PLC?




There are several reasons why you may need to crack the password of your Siemens S7-200 PLC. For example:


  • You have forgotten the password and you need to upload or modify the program on your PLC.



  • You have bought a second-hand PLC and you want to use it for your own project.



  • You want to learn from the program of another PLC or reverse engineer it.



  • You want to test the security of your PLC or perform ethical hacking.



How to crack the password of Siemens S7-200 PLC?




There are different ways to crack the password of Siemens S7-200 PLC depending on the CPU version, the password level, and the tools you have. Here are some possible methods:


Method 1: Use S7unpassword software




S7unpassword is a software tool that can crack the password of Siemens S7-200 PLCs with CPU versions below 2.01. It can also convert level 4 passwords (disable upload) to level 3 passwords (enable upload) if your PLC has this feature. To use this tool, you need to connect your PLC to your computer via a serial cable or a USB adapter and follow these steps:


  • Download S7unpassword from this website [^3^] and unzip it.



  • Run S7unpassword.exe as administrator.



  • Select your PLC type from the drop-down menu (e.g., S7-200 REL 02.01).



  • Select your COM port from the drop-down menu (e.g., COM1).



  • Click on Connect button and wait for the connection status to show OK.



  • Click on Read Password button and wait for the password to be displayed on the screen.



  • If you want to convert level 4 password to level 3 password, click on Convert button and wait for the confirmation message.



  • Click on Disconnect button and close the software.



You should now be able to upload or modify the program on your PLC using STEP 7 Micro/WIN software or other compatible software.


Method 2: Use Hexa editor and EEPROM reader




If your PLC has a CPU version above 2.01 or if S7unpassword does not work for you, you may need to use a more advanced method that involves reading and editing the binary data of the EEPROM chip inside your PLC. EEPROM stands for electrically erasable programmable read-only memory and it is where the program and password of your PLC are stored. To use this method, you need an EEPROM reader/writer device that can connect to your computer via USB or serial port and a Hexa editor software that can open and edit binary files. You also need to open your PLC case and locate the EEPROM chip on the circuit board. The chip model e0e6b7cb5c


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