S7-200 Smart Password Unlock [2021]

If you have lost the password, use these standard procedures to regain access to the hardware:

There are unofficial "cracking" software and services (often found on specialized automation sites like

The techniques described below are for recovering access to PLCs that you legally own or have explicit written permission to modify. Unauthorized access to industrial control systems (ICS) may violate: s7-200 smart password unlock

Unlocking a Siemens S7-200 SMART PLC is a common task when a password is lost, though it typically requires wiping the device. Methods to Unlock

If your primary goal is to get the machinery running again and you do not care about saving the old program (or you already have a backup of the project file on a laptop), the factory reset is the safest method. This completely wipes the PLC memory, including the password, allowing you to download a fresh project. If you have lost the password, use these

Individual subroutines, functions, or data blocks can be encrypted independently of the main PLC system password.

If you are prompted for a password while trying to clear the PLC, enter (not case-sensitive). This is the universal bypass to factory reset the hardware, allowing you to download a new program even if you don't know the old password. Levels of Password Protection Level 1: Read-only access allowed without a password. Level 2: Password needed to write/modify the program. This completely wipes the PLC memory, including the

Siemens frequently patches security exploits. Crackers that worked on Firmware V2.0 will likely fail or lock up a PLC running Firmware V2.5 or higher. Method 3: Recovering POU/Subroutine Passwords

Restricts access to the entire PLC (Read/Write/Full Access).