Although the FX3Uplc decryption has been successfully researched, the correct program and parameters can be read out even if the problem of uploading is prohibited. Here, the process of decryption is sorted out for reference by interested friends.
First of all, the programming software used by Mitsubishi PLCFX3U must use GXDEVELOPER8.10 or higher, or you can download a program that supports FX3U online. Start GXDEVELOPER and you will see the version number of the programming software on the Help menu. Then create a new project from the project menu, select FXCPU in the PLC series, you can program the FX3U various operations.
Secondly, the FX3U encryption method: After opening GXDEVELOPER, enter from the menu "Online → Login Keyword → New Login, Change...". The FX3U can set two passwords, the keyword and the second keyword, each with 8 characters.
Finally, just write a test program, no encryption, no two keywords are set, write to FX3U, and then use FXWIN software to select the FX2N model reader, so that you can read the correct program. Downloading by FX2N model can also download the program, indicating that the FX3U encryption mechanism is exactly the same as FX2U when not only one keyword is set.
Computer sent: 00E0202 query the value of D8001. PLC back: B15E replies 5EB1, the data of the reply is high, and the low position is in front. Therefore, it is necessary to adjust the position. 5EB1 is converted to 10. The data value is 24241, 24 indicates PLC model FX2N or 3U, and 241 indicates the version number.
Computer sends: 00ECA02 code to query the value of D8101, PLC back: 713F replies to 3F71 and converts to 10 into data value: 16241, 16 means PLC model is FX3U. 241 indicates the version number.
Just follow the above plus time to be sure to decrypt the Mitsubishi FX3UPLC successfully.
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