(or follow specific OEM instructions for a "Transfer" card). Power Down: Turn off the PLC power supply. Insert and Power Up: Insert the MicroSD card and turn the power back on. Watch the LEDs: Wait until the
Legality and Ethics
Overview
Incorrectly reading or modifying the EEPROM hex code can permanently corrupt the PLC's firmware, rendering the hardware useless. siemens s7 200 smart password unlock fixed
You can also use STEP 7 Micro/ Win or STEP 7 Manager software to unlock your device:
User program and data blocks remain intact; the system block’s password field is zeroed.
: This level prohibits uploading the program or configuration entirely. You cannot "retrieve" the code from a Level 4 protected PLC without the original project file. Summary Table: Unlock & Reset Options Data Retention Primary Use Case Required Tools CLEARPLC Forgot password, need to reload new code MicroWIN SMART Micro SD Card Forgotten password, remote reset Micro SD Card WIPEOUT.exe Total hardware reset (baud rate/address) Wipeout software OEM Contact Yes Need to see or edit original code Machine Manufacturer (or follow specific OEM instructions for a "Transfer" card)
For a deeper reset that bypasses software prompts, use a standard MicroSDHC card (up to 32GB). Create a Reset Card: On your PC, create a text file named S7_JOB.S7S RESET_TO_FACTORY
Use a PPI or USB-PPI cable (e.g., 6ES7 901-3DB30-0XA0 ).
This method will delete the current program running on the PLC. Ensure you have a backup of the project file before doing this. If you cannot upload the current program due to the password, you will be left with a blank PLC. Method 2: Contact the Original Equipment Manufacturer (OEM) Watch the LEDs: Wait until the Legality and
Select and crucially, ensure you remove any password settings. Click "OK" to confirm.
Users can monitor and copy data but cannot modify the project.