Unlock POU Password S7-200 Use Step7 MicroWIN V4.0 SP9

To the ontrol program for an S7-200 CPU consists of the following types of Program Organizational Unit (POU): Main program, Subroutines, Interrupt routines.

How to set and unlock POU password S7-200 use Step7 MicroWin V4.0 Software SP9 also free POU Unlock Software.



Setup a POU Password


  1. Step 1: Use Step7 MicroWIN V4.0 program open the project. Right click on a POU > Properties… > Protection tab

  2. Step 2: Tick on “Password Protect this POU” box

  3. Step 3: Type the characters to “Password” and “Verify” (These values are the same)

  4. Step 4: Click “OK”. Close and save the project to apply the password.




When you right-click on the “MAIN” POU, you will see an option:- “Password protect All POUs using this password”. If you tick on this box, your password application to all POUs, the POUs already a password will be using the old password begin.

How to Unlock POU Password S7-200

Why we are do it

  • To see code, edit the program

  • Some programs writes by you: Maybe forgot the password.

  • The program writes by other people: You can not contact the programmer.

  • We do not encourage it, if you can contact the programmer.


How Disable Step by step


  • Step 1: Check Step 7 MicroWIN V4.0 Version on your computer. This tool only supports the version V4.0 Service pack 8 (SP8) or Service pack 9 (SP9)

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  • Step 2:  Download the tool at the end of post.

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  • Step 3: Open the path: “C:\Program Files\Siemens\STEP 7-MicroWIN V4.0\bin”. Rename file “datamanagers200.dll” to “datamanagers200-backup.dll”

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  • Step 4: Extract the downloaded file. Copy file “datamanagers200.dll” to C:\Program Files\Siemens\STEP 7-MicroWIN V4.0\bin

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  • Step 5: Open the project you need unlock POU password S7-200. Enjoy it!

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V4.00 SP8 : Download

V4.00 SP9 : Download


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