Omron PLC powers up after the program is locked, can not be cleared by software - Database & Sql Blog Articles

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1. Fault Phenomenon: The PLC cannot upload or download programs after power-on, and the program cannot be cleared (UM protection is reported).

2. Cause of Failure:

(1) The program is password protected and can be erased using the Programmer connector by entering the correct password.

3. Notes:

(1) Always remember the password you set to avoid future issues.

(2) If the password is forgotten, it can be overwritten using a memory box.

1. After turning off the PLC, set DIP switch No. 2 to ON and all others to OFF.

2. Remove the memory cover that comes with the PLC and insert the memory cartridge without a password.

3. Once the BKUP indicator starts flashing, it will remain on after power-up. At the same time, the digital display will change, and the BKUP light will go out at the same time. Only the POWER light should be on, indicating that the program has been successfully overwritten. Turn off the power, remove the memory box, replace the cover, and restore the DIP switch settings.

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