This method is viable only if you or the machine's vendor have a recent, complete backup of the program. Without it, you are left rebuilding from scratch. For many old systems, this backup may not exist, making this a last resort.

: You can perform a hardware reset by cycling the mode selector switch. Switch off the power and remove the MMC.

This locks individual code blocks (like FCs or FBs) to prevent users from viewing or editing the logic. The compiled code resides on the Micro Memory Card (MMC), but the source text is hidden. 2. CPU Access Protection