Select "All" (including Retentive Values and Program Memory). Confirm the action. The PLC will now be unlocked and empty. Method 3: Password Recovery Tools and Services
Getting locked out of a Koyo (DirectLogic) PLC can bring a production line to a standstill. Whether it’s a forgotten legacy password, a former employee who didn't leave the credentials, or an inherited machine with "Read/Write" protection, knowing how to handle a situation is a vital skill for automation engineers . koyo plc password unlock
Often, passwords are noted in the original electrical schematics or the "As-Built" documentation provided by the System Integrator. Select "All" (including Retentive Values and Program Memory)
Never attempt a hardware-level unlock without understanding that a mistake could corrupt the PLC firmware. Method 3: Password Recovery Tools and Services Getting
Store PLC credentials in a secure company-wide password manager.
Always keep an unprotected .PRG backup file on a secure server.
Once you regain access, implement a strategy to ensure it doesn't happen again: