Free for in-warranty units; approximately $150–$300 for out-of-warranty service (depending on region).
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ST, SR, and CR series CPUs with firmware V2.3 or higher (V3 CPUs also support this method exclusively). siemens s7 200 smart password unlock fixed
Today, reliable services use a combination of microcontroller-level access: JTAG or SWD (Serial Wire Debug). This requires opening the PLC. Free for in-warranty units