For hardware UM passwords, Omron provides a legitimate method—but it is destructive. Using CX-Programmer, you can perform an "All Memory Clear" operation. This erases the entire user program and its password, resetting the PLC to factory defaults. This does not recover the password; it deletes it along with the program. This is useful if you own the code but have lost the ability to upload it, provided you have a backup file.
The most common Omron password locks are found on the CJ (CJ1M, CJ2M), CS (CS1G/H), and CP (CP1E, CP1H) series, programmed via CX-Programmer. Omron Password Recovery Tool
If you are reading this review, you likely have a machine that is down or needs modification, but the original programmer has left, the documentation is lost, or the password was simply never recorded. Without this tool, you are facing a costly replacement of the PLC hardware or a complete rewrite of the logic. The Omron Password Recovery Tool effectively neutralizes this disaster scenario. For hardware UM passwords, Omron provides a legitimate
If you need the existing code (e.g., no backup exists), you need a recovery tool, not a clear tool. Procedure using a typical third-party tool:
Popular tools for CJ/CS series:
Procedure using a typical third-party tool:
Success Rate: 85% on CJ1/CS1. Newer CJ2 and CP1 series have better protection, reducing success to 40%.