We’ve all been there. You pick up a project that was programmed six years ago, the original programmer left no documentation, and suddenly you’re staring at a locked Koyo (AutomationDirect/Entivity) PLC. Whether it’s a CLICK, DL05, DL06, or a DirectLogic 205, hitting that password wall can shut down a production line.
Try leaving the password field completely blank, or inputting 0000 , 1111 , or 8888 .
This guide is for educational purposes and for recovering access to equipment you legally own or are authorized to service. Unauthorized access to industrial control systems (ICS) is illegal under laws like the Computer Fraud and Abuse Act (CFAA) in the US and similar legislation globally. We do not condone industrial espionage or sabotage.
Alternatively, changing specific bytes in a saved project file from 01 (Password Active) to 00 (Password Inactive) could strip the security layer. Risks of Third-Party Software Unlocking Tools
Check default factory keys first. If those fail, look for an un-passworded offline backup on your company servers, or contact an authorized industrial recovery specialist to read the memory blocks safely. koyo plc password unlock
Stay safe, back up your passwords in a vault, and happy troubleshooting.
Incorrectly modifying memory registers can brick the PLC CPU, requiring a complete hardware replacement.
Koyo PLC Password Unlock: Comprehensive Guide & Recovery Methods
: Older firmware versions for certain Koyo/DirectLogic PLCs had vulnerabilities (like CVE-2022-2003) that allowed attackers to extract the password over serial or Ethernet using specific byte sequences. While these are generally patched in newer units, they may still work on legacy field equipment. We’ve all been there
If you are currently locked out of a critical system, tell me you are using and which version of DirectSOFT is installed so I can provide targeted technical steps. Share public link
Allows users to view the running program but prevents any online edits or overrides. How Passwords Are Stored
: These PLCs frequently use a fixed format consisting of one letter followed by seven digits (e.g., ). The "A" is a common default prefix. Common Patterns : Users often use simple sequences like
For a guaranteed unlock when the password is unknown, professionals turn to the Metasploit framework. In 2012, security researcher Reid Wightman released a module specifically targeting the Koyo ECOM series. The module, auxiliary/scanner/scada/koyo_login , is now a standard part of the Metasploit Framework. Try leaving the password field completely blank, or
If you do not need the original program and just want to reuse the PLC, you can perform a complete memory clear. DirectLogic Series (DL05, DL06, DL205, etc.): DirectSoft Programming Software . Connect to the PLC, navigate to the Clear PLC Memory
This comprehensive guide explores the methods used to unlock Koyo PLCs, how to prevent permanent data loss, and how to properly secure your industrial control systems. 🛑 Important Disclaimer and Ethical Notice
If vendor documentation is unavailable or the password cannot be recovered safely, escalate to: