There are three distinct levels of protection:
If the protection level allows online connection (e.g., Read Access or standard online diagnostics), you can reset the unit via software. Open TIA Portal and navigate to the . S7-1200 Password Unlock
If your goal is to reuse the hardware and you don't care about the existing program, a factory reset is the only guaranteed solution. Using a Siemens Memory Card (SMC) There are three distinct levels of protection: If
Users can view the program and diagnostics but cannot modify the online logic or download new code without a password. Using a Siemens Memory Card (SMC) Users can
+-------------------------------------------------------------+ | S7-1200 FACTORY RESET SEQUENCE | +-------------------------------------------------------------+ | | | [ Power Off PLC ] --> [ Insert Empty SMC ] --> [ Power On ] | | | | | | | v | | ( MAINT LED Flashes ) | | | | | v | | [ Power Off PLC ] --> [ Remove SMC ] --> [ Power On ] | | | +-------------------------------------------------------------+ Step-by-Step SMC Reset Procedure: the S7-1200 CPU completely.
To prevent future lockouts, it helps to understand how TIA Portal structures S7-1200 protection. When configuring a CPU under , you encounter four primary access levels: Access Level Read Access? Write Access? Password Required For: Full Access (No Protection) Read Access Modifying code, changing values, downloading HMI Access Only HMI panels can communicate freely No Access (Complete Protection) Doing anything via TIA Portal online
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