. This process erases the internal load memory, including the current program and the password protection. Siemens SiePortal 1. Requirements SIMATIC Memory Card
If you have forgotten the password for a PLC, the most common way to "unlock" the device is to perform a factory reset using a specialized transfer card . There is no official way to recover or bypass a forgotten password without erasing the existing user program and hardware configuration. Recovery Using a SIMATIC Memory Card
: Ensure the card is empty by deleting all existing files or using the "Format memory card" option in the TIA Portal.
Comprehensive Guide to Siemens S7-1200 Password Unlock and Recovery Workarounds s71200 password unlock work
If you cannot access the PLC online due to the password, you can use a Siemens SIMATIC Memory Card (SMC) to clear the CPU.
If the PLC access protection level allows "Read Access" or basic online diagnostics without a password, you can reset it via software: Connect your PC to the S7-1200 using an Ethernet cable. Open .
To successfully clear the password block, you must gather the proper hardware: Requirements SIMATIC Memory Card If you have forgotten
Power down the S7-1200 completely. Step 2: Remove the SIMATIC Memory Card (if inserted). Step 3: Insert a formatted blank SD/MMC card into the slot. Step 4: Power up the PLC. The CPU will copy its internal firmware & password to the card (creating a clone). Step 5: Power down again. Remove the card. Step 6: Using a PC card reader, delete the S7_JOB.S7S and PASSWORD files (Do not delete OS files unless you want to brick it). Alternative: Simply insert the cloned card into a different S7-1200. The password moves with the card, leaving the original CPU unlocked.
Default state (up to TIA Portal V16), allowing complete read/write access.
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You cannot bypass Siemens' password protection without authorization. The supported, legitimate methods are password recovery via the original project/account or full device reset (which erases program and data). Attempting unauthorized bypasses is illegal and unsafe.
The simplest form of "unlock work" is not really an unlock—it’s a . If you do not need the existing program and only need a functional CPU, this is the fastest, safest, and 100% legal method.