Koyo Plc Password Unlock May 2026

Unlocking a Koyo PLC (often branded as AutomationDirect DirectLogic or Click) typically involves either discovering the original password through investigation or performing a factory reset that wipes the internal program. Most official channels do not provide a software-based "bypass" that preserves the existing code, as this would defeat the purpose of the security feature. 1. Password Recovery Strategies

Before resorting to destructive reset methods, attempt to find the password to preserve the ladder logic and configuration.

Standard Formats: Many Koyo systems use a specific password pattern, especially when integrated with an HMI. The common format is Axxxxxxx, where "A" is a literal alphabetic character and "x" represents up to seven numerical digits (e.g., A0000000 to A9999999).

Physical Inspection: Thoroughly check the control cabinet, cabinet doors, and electrical drawings for handwritten notes or labels. Sometimes the password is set to the equipment's model number (e.g., A060SF05) or serial number if it fits the 8-character alphanumeric limit.

Brute-Force Tools: For legacy DirectLogic systems, third-party utilities like the DigitalBond Koyo Brute Force Utility can automate the guessing process over an Ethernet connection (using an H0-ECOM100 card), though this can take several days depending on the password's complexity. 2. Official Reset (Memory Wipe)

If the password cannot be found, the only factory-supported method to regain control of the hardware is to wipe the CPU memory entirely. Warning: This will permanently erase the user program and all data registers.

AutomationDirect Support: The official solution for series like the DL205 (DL230 CPU) Go to product viewer dialog for this item. or Go to product viewer dialog for this item. is to return the unit to AutomationDirect Technical Support

. They will verify ownership and perform a complete memory clear. Manual Memory Wipe: For some models like the Go to product viewer dialog for this item.

, you can perform a manual "clear-all" operation. This typically involves placing the PLC in STOP mode and following specific hardware sequences, such as manipulating DIP switches or removing the memory capacitor, as detailed in the DirectLogic Hardware Manuals.

Click Series: For Koyo Click PLCs, you can use the Click Factory Default tool within the programming software to reset the device to its factory state, which also clears any existing passwords. 3. Alternative Recovery & Software Tools

In some cases, specific hardware or software exploits may allow access without a full factory reset.

MMC Card Transfer: For some PLC versions, you can create a simple un-passworded program, save it to an MMC card, and plug that card into the PLC. Performing a transfer from the card can effectively overwrite the locked program and reset the password.

Legacy Vulnerabilities: 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.

DirectLogic: These typically do not have a default password enabled unless one was set by the programmer.  3. Technical Research & Brute Force  koyo plc password unlock

There are no official papers for "bypassing" security, but security researchers have documented vulnerabilities in legacy protocols: 

Brute Force Utility: A Koyo DirectLogic Password Brute Force Utility was developed for older models. It attempts to authenticate using passcodes that traditionally began with the letter "A" followed by seven digits (e.g., A0000000 to A9999999).

Communication Interception: Older Koyo protocols often transmit passwords in plain text or with very simple encoding. Technical articles on Recovering Access to a Password-Locked Koyo PLC suggest that for legacy systems, sniffing the serial communication while the software attempts to log in may reveal the passcode.  4. Important Limitations 

Loss of Documentation: Even if you successfully unlock a Koyo PLC to upload the program, the uploaded code will not contain comments, rung descriptions, or tag names. These are stored in the original DirectSOFT project file on a PC, not in the PLC hardware itself.

Physical Security: If software access is impossible, manufacturers recommend relying on physical cabinet locks and maintaining strict documentation of passwords in an asset register to avoid future lockouts. 

Unlocking a Koyo PLC generally requires the original password; if lost, the only official way to regain access is to reset the unit to factory defaults, which permanently erases the existing program. Official Reset Methods by Series

For most Koyo (AutomationDirect) PLCs, you must either use specialized software tools or return the hardware for service. CLICK Series:

Software Tool: Use the CLICK Factory Default Tool installed with the programming software. This requires an RS-232 serial connection.

Hardware Button: On CLICK PLUS (C2-02/03) models, set the switch to STOP and hold the BT Pairing Button for 5–6 seconds until the LED flashes rapidly.

Default Credentials: CLICK PLUS units often ship with the default username admin and password click. DirectLOGIC Series (DL05, DL06, DL205): No Field Reset:

These legacy units do not have a standard "reset button" to bypass passwords. If the password is unknown, AutomationDirect requires you to send the CPU to their technical support team for a full memory clear. Manual Wipe (Risky): For some Go to product viewer dialog for this item.

models, removing the memory capacitor or using specific DIP switch sequences may clear memory, though this is model-dependent and not always effective for password removal.

CLICK PLUS Hardware User Manual (C2-USER-M) - AutomationDirect

Title: Forgot the Password? A Realistic Guide to Koyo PLC Password Recovery (The “Unlock” Dilemma)

Intro 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.

There is a lot of noise online about "password unlock tools" and "backdoor codes." Let’s separate fact from fiction and look at the actual ways to regain access to your Koyo hardware.

The Hard Truth: No Universal Backdoor Unlike some consumer electronics, Koyo PLCs (sold under AutomationDirect in the US) do not have a public, universal "master password." If someone tells you to type "God" or "Admin" into a DirectSoft prompt—ignore them. Koyo uses a hashing algorithm that is specific to the CPU firmware and the user-set password.

Scenario A: You have the program, but forgot the password If the PLC is locked but you have the original project file (.prj or .dld), you can often bypass the password within the programming software (DirectSOFT or Do-more Designer) by using the "Clear Password" function under the PLC > Security menu. This requires the file to be open and writable.

Scenario B: You have the hardware, but no program and no password (The "Unlock") This is where "unlocking" gets technical and risky. Here are the three legitimate methods used by integrators:

1. The EEPROM Reset (Destructive) : Most Koyo units (DL05, DL06, DL205) allow you to reset the PLC to factory default by clearing the user memory. This completely erases the program and the password. You lose the code, but you get the PLC back. (Method: Set the dip switch to "Program" or "Terminal," cycle power, and use DirectSOFT to "Write to PLC" a blank program).

2. The "Password Unlock" Utility (The Grey Area) : AutomationDirect officially provides a "Password Recovery Service" for a fee. However, third-party tools exist (e.g., PLC-Tools, KPG-UNLOCK) that brute-force or extract the hash via the programming port. Warning: These often require legacy OS (Windows XP/7) and specific serial cables. Use at your own risk, and never on a live machine.

3. The Chip-Off Method (Forensic) : For critical machines where you cannot lose the program, specialists desolder the EPROM or MCU from the board, read the hex directly, and nullify the password check. This costs $300-$600 but has a 90% success rate.

The "CLICK" PLC Exception If you are using the newer Koyo-built CLICK series (via CLICK Programming Software), you are in luck. The CLICK software has a built-in "Forgot Password" feature that generates a temporary override code based on the CPU's serial number. You need to contact AutomationDirect support with that code—they will give you a temporary bypass if you prove ownership.

Critical Warnings

• Legality: Only attempt to unlock a PLC you legally own. If you are a hired integrator, get written permission from the plant owner.
• Safety: Never cycle power or attempt a memory clear on a running machine without a full LOTO (Lockout/Tagout) procedure. You could drop a hoist, open a valve, or start a conveyor.
• Malware: Be extremely wary of free "Koyo unlocker.exe" files from forums. These are often riddled with ransomware.

The Best Solution? Documentation Before you spend hours trying to hack a $149 PLC, ask yourself: Is the program worth saving? If the machine is obsolete, sometimes rewiring a new CLICK or Do-more PLC with fresh logic is faster than unlocking the old dinosaur.

Final Verdict Can you unlock a Koyo PLC? Yes. Is it a simple button push? No.

• Try the serial number call-back for CLICK series.
• Use DirectSOFT password clear if you have the file.
• Use a full memory wipe if you just need the hardware.
• Hire a forensic service if the code is priceless.

Stay safe, back up your passwords in a vault, and happy troubleshooting.

Disclaimer: This post is for educational and recovery purposes only. The author is not responsible for damage caused by unauthorized access or improper handling of industrial controls.

Unlocking a Koyo PLC password typically involves either attempting default credentials, using brute-force tools, or, in extreme cases, a memory wipe that results in data loss. Common Default Credentials & Formats CLICK Series : The default password is often DirectLogic Series

: 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

, or the equipment's model/serial number if it fits the 8-character format. Recovery & Unlocking Methods Brute-Force Utilities : For DirectLogic PLCs, tools like the Koyo Login scanner Unlocking a Koyo PLC (often branded as AutomationDirect

in the Metasploit framework can automate the process. This method can take several days depending on the password complexity. Specialized Software

: Some third-party technicians offer custom Windows-based software that claims to reveal the password almost instantly via a programming cable. CPU Memory Wipe (Last Resort)

: If recovery fails, you can regain control by clearing the PLC memory.

Warning: This will permanently delete the ladder logic program.

This is usually done via DIP switches or a memory capacitor on the CPU, following the specific model's hardware manual. Local Professional Services

If you cannot unlock the device yourself, specialized industrial automation services can often assist: Unlock PLC (Hanoi/Global)

: Offers password cracking services for various Koyo models including DL05, DL06, and DL405. AutomationDirect Support

: The official community forum for Koyo's primary distributor, where users discuss reset procedures for CLICK and DirectLogic hardware. Automation Direct

Which specific Koyo PLC model (e.g., DL05, DL205, CLICK) are you currently trying to access? Koyo directlogic06 plc password needed

To unlock a Koyo PLC (distributed by AutomationDirect ) when the password is lost, you must typically perform a factory reset , which will erase the existing program

. There is no official way to recover a forgotten password while keeping the program intact. 1. Default Passwords to Try

Before performing a reset, try these common default or "guessable" passwords: (Default for CLICK Ethernet and CLICK PLUS CPUs). Company Name Project Number Machine Model Number (no password). 2. Resetting the CLICK Series

For CLICK PLCs, you can use the software to reset the unit to factory defaults: Using CLICK Software : Navigate to the menu, select , and choose Reset to Factory Default Using the Click Factory Default Tool

: This standalone utility is installed with the programming software and communicates via a serial connection to reset the CPU. Automation Direct 3. Resetting the DirectLogic Series

For older DirectLogic units (like the DL05, DL06, DL205), the options are more limited: Manufacturer Support : You can send the CPU to AutomationDirect

in the United States. They will clear the password and program free of charge (shipping costs apply). Overwriting via Hardware : For some models, you can insert an MMC/Memory Card

containing a blank or new program while the PLC is powered off. When powered on, the PLC may overwrite the protected program with the new one, effectively clearing the password. Automation Direct 4. Advanced/Unofficial Methods

If you must retrieve the program, some third-party solutions exist, though they are not supported by the manufacturer: Brute Force Scripts : There are scripts for the Metasploit framework

that can attempt to brute-force the password over an Ethernet connection (ECOM card required). Third-Party Software

: Certain online specialists offer Windows-based software that claims to reveal Koyo passwords nearly instantly via a programming cable.

Always verify you have the legal right to access the PLC program before attempting to bypass security features. Do you have the specific model number

of the Koyo PLC (e.g., DL06, Click, or DL205) so I can find the exact reset procedure? Password Setup - Ethernet CPUs - AutomationDirect

If you've lost access to your Koyo PLC due to a forgotten password, here are some general steps and recommendations:

2. CPU Reset (The "Nuclear" Option)

If you do not need the existing logic inside the PLC—for example, if you are retrofitting the machine and have a new program written—you can often wipe the PLC clean.

For many Koyo/DirectLOGIC models:

1. Power down the PLC.
2. Locate the battery jumper or capacitor reset pins (refer to the specific hardware manual for your CPU model).
3. Perform a memory clear. This resets the PLC to factory defaults, removing the password and the program.

Warning: This destroys the existing logic. Do not do this if you do not have a backup of the code.

Why Is the PLC Locked?

It is important to consider why a PLC is locked before trying to unlock it.

• Intellectual Property: The original system integrator may have locked the code to prevent competitors from copying their machine logic.
• Safety and Liability: The programmer may have locked it to prevent unqualified personnel from altering safety interlocks or timing parameters, which could cause mechanical damage or personal injury.
• Security: In an era of cyber-threats, preventing unauthorized access to manufacturing processes is standard practice.

Understanding Koyo PLC Security

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.

When a PLC is password-protected, it usually restricts access in one of two ways:

1. Read/Write Protection: You cannot upload the program from the PLC to your PC, nor can you download changes.
2. Level-Based Protection: Some models allow "OEM" levels where the machine can run, but the logic is hidden from the end-user.

If you do not have the password, the programming software (typically DirectSOFT or C-More) will block access to the program contents.

5. Use Software Tools

• There are software tools provided by PLC manufacturers that can help manage access, update firmware, or even reset passwords. Koyo, being part of the Panasonic group, may have specific tools available through their support channels.