These older units use Koyo's traditional password protection. CLICK PLC Series:
The method for unlocking a Koyo PLC depends heavily on the series you are using: DirectLOGIC Series ( koyo plc password unlock
: For DirectLogic models, you can send the CPU to AutomationDirect (within the U.S.). They will clear the password and program free of charge, but they cannot retrieve the project. 2. Default Passwords These older units use Koyo's traditional password protection
Information on "universal password tools" for Koyo PLCs can be found online, but their reliability and safety are questionable. While some of these tools (like the "光洋PLC万能密码工具") claim to decode passwords for the entire Koyo product series, they are not official products. Using them carries significant risks, including malware and bricking the PLC. Using them carries significant risks, including malware and
Fortunately, Koyo provides several methods to unlock and reset the password:
: The official community forum for Koyo's primary distributor, where users discuss reset procedures for CLICK and DirectLogic hardware. Automation Direct