This works on legacy Koyo S-series (S-10, S-14, S-20, S-40, S-80). These units respond to a specific memory read command that bypasses the login screen in older software versions.
If your only goal is to reuse a locked CPU and you , a factory reset is an effective solution. For many Koyo and AutomationDirect PLCs (like the DL05, DL06, DL105, and DL205), the only password removal method offered by the manufacturer is to completely wipe the CPU, which erases the program. This is analogous to a factory reset and returns the PLC to a blank state, allowing you to download a new program.
Koyo Electronics, widely known for their "DirectLOGIC" series (sold by AutomationDirect) and the iconic "S" series (S-10, S-14, S-20, S-40, etc.), are workhorses of small-to-medium scale automation. While their password protection is robust for standard security, losing that password does not mean you need to scrap the controller or ship the machine back to Germany or Japan. koyo plc password unlock
Sometimes, the password only prevents online edits . Try the "Upload" function. Many machine builders password the "Write" function but leave "Read" open for troubleshooting. If you can upload the logic, you can strip the password offline.
It cannot be stressed enough:
Koyo PLCs have a built-in boot mode that allows users to access the device even if the password is forgotten. To use this method:
If your primary goal is to get the machine running again and you already possess a backup copy of the original PLC project file, a factory reset is the cleanest approach. This works on legacy Koyo S-series (S-10, S-14,
Koyo PLCs, particularly the popular DL05, DL06, DL105, and DL205 series, utilize a password protection system designed to protect intellectual property (IP) and prevent accidental changes.
Check physical panels, electrical schematics, and original commissioning paperwork for handwritten credentials. 2. Clearing PLC Memory (Factory Reset) For many Koyo and AutomationDirect PLCs (like the
This works on legacy Koyo S-series (S-10, S-14, S-20, S-40, S-80). These units respond to a specific memory read command that bypasses the login screen in older software versions.
If your only goal is to reuse a locked CPU and you , a factory reset is an effective solution. For many Koyo and AutomationDirect PLCs (like the DL05, DL06, DL105, and DL205), the only password removal method offered by the manufacturer is to completely wipe the CPU, which erases the program. This is analogous to a factory reset and returns the PLC to a blank state, allowing you to download a new program.
Koyo Electronics, widely known for their "DirectLOGIC" series (sold by AutomationDirect) and the iconic "S" series (S-10, S-14, S-20, S-40, etc.), are workhorses of small-to-medium scale automation. While their password protection is robust for standard security, losing that password does not mean you need to scrap the controller or ship the machine back to Germany or Japan.
Sometimes, the password only prevents online edits . Try the "Upload" function. Many machine builders password the "Write" function but leave "Read" open for troubleshooting. If you can upload the logic, you can strip the password offline.
It cannot be stressed enough:
Koyo PLCs have a built-in boot mode that allows users to access the device even if the password is forgotten. To use this method:
If your primary goal is to get the machine running again and you already possess a backup copy of the original PLC project file, a factory reset is the cleanest approach.
Koyo PLCs, particularly the popular DL05, DL06, DL105, and DL205 series, utilize a password protection system designed to protect intellectual property (IP) and prevent accidental changes.
Check physical panels, electrical schematics, and original commissioning paperwork for handwritten credentials. 2. Clearing PLC Memory (Factory Reset)