Delta Electronics PLCs (programmable logic controllers) are widely used in industrial automation. "Password unlock software" refers to tools or methods claimed to remove or recover lost/forgotten passwords protecting PLC program access or configuration. This article summarizes how password protection works on Delta PLCs, legitimate recovery options, risks of third‑party unlock tools, recommended practices, and legal/ethical considerations.
We have reviewed dozens of tools. Here are the three most cited "new" solutions currently circulating in automation forums. Disclaimer: Use these only on equipment you own or have permission to repair.
Total Reset: If the logic isn't needed, perform a factory reset.
Winner for Speed: PLCGuard Pro 2024 This is currently the most downloaded tool. It connects via USB to RS-232 (or Ethernet for AS series). The "new" feature is its AI pattern recognition. It doesn't brute force; it scans the firmware residuals left in the PLC's volatile memory. For 90% of Delta DVP models, it returns the password in under 10 seconds. The software also includes a "Reset to Factory" function, though this wipes the program.
If the software fails: Your PLC likely has a hardware lock tied to a unique ID. You will need the "EEPROM Bridge" method, which involves desoldering an 8-pin chip.
Searching for "new" unlock software often leads to third-party tools that claim to bypass or decrypt passwords for specific models like the Functionality
