Unlock S7300 Plc Password Hot -

如果程序中的部分功能块（OB、FB、FC、DB）使用了 KNOW_HOW_PROTECT 加密保护，在上传程序到电脑后，这些块会显示为小锁图标。此时可以使用专用的 S7 程序解密工具对这些加密块进行解锁操作。请务必在使用前对原 Project 进行完整备份，以防操作失误导致数据丢失。

Force a read command specifically targeted at Data Block 0 or the system memory areas where passwords reside. unlock s7300 plc password hot

Cannot monitor, read, or change code. Methods to Unlock S7-300 PLC Password Best Practices to Prevent Future Lockouts The STOP

Running a compatible Windows environment (usually Windows 7 or 10 depending on STEP 7 version). Best Practices to Prevent Future Lockouts unlock s7300 plc password hot

The STOP LED will blink rapidly, indicating the memory is being cleared. MMC Card Transfer : You can overwrite the existing program by inserting a Micro Memory Card (MMC)

通过 STEP7 软件的 KNOW_HOW_PROTECT 功能对 OB、FB、FC、DB 等程序块进行加密保护。加密后的程序块被打开时只能看到接口数据（IN、OUT、IN/OUT 参数及注释信息），程序代码、注释及临时/静态变量均不可见，也无法对加密块进行任何改动。

If you must keep the existing program, you may need to read the password directly from the MMC card or the PLC's internal memory. Reading the MMC : Use a specialized USB Prommer Siemens Field PG