When a password is lost, the CPU will show as "Access denied" in STEP 7 (Classic) or TIA Portal. Standard upload attempts fail.
Siemens patched this in later firmware versions (FW 3.x above). If your CPU is older, this method works in seconds. If it is new, it will fail. unlock s7300 plc password work
position while cycling the power, he could perform a factory reset. The CPU would return to its delivery state, the memory would be wiped, and the password would vanish. When a password is lost, the CPU will