: Remove the card and cycle the power. The CPU is now in a "factory" state with no password. 3. Software Reset (Online & Diagnostics)
If you own the .ap12 to .ap18 project files, you can remove protection by right-clicking the block, navigating to Properties > Protection , and entering the block password.
If a standard reset fails, a firmware update can force a factory state.
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Power off the S7-1200 CPU, insert the empty Siemens memory card, and power the PLC back on.
Insert an empty Siemens Memory Card into the slot. (Note: A standard commercial SD card will not work and can damage the slot). Power Up: Turn the power back on.
This is the only official method that Siemens provides for unlocking a password-protected S7-1200 CPU when the password is unknown. The process leverages the behavior of the PLC's load memory, forcing it to be overwritten by an empty transfer card. : Remove the card and cycle the power
The previous programmer has left the company. The original source code is lost on a dead hard drive. The OEM has gone out of business. You are locked out of your own machine.
Insert the card into your PC and use TIA Portal to create an "empty transfer card". Power Down: Turn off the power supply to the S7-1200 CPU.
is a common challenge when credentials are lost or a system is inherited without documentation. While there is no "backdoor" to recover the existing program without the password, you can successfully to regain control. 1. Resetting via SIMATIC Memory Card (Most Effective) Software Reset (Online & Diagnostics) If you own the
The CPU will enter a stop state. Wait until the MAINT LED flashes, indicating the memory wipe is complete.
A SIMATIC Memory Card (minimum 4MB or larger, e.g., 6ES7954-8LC03-0AA0). The Procedure:
: Cut the system power once more. Remove the SMC from the slot
into your PC. In TIA Portal, open the card reader view and or ensure it is empty.