To read Mitsubishi PLC password - Database & Sql Blog Articles

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1. First, choose a serial port debugging tool. MultiCOMWatch is highly recommended for this task. 2. For Mitsubishi FX series PLCs, password verification is done through a clear code method. This means that the password can be retrieved by monitoring the communication process. When the programming software connects to the PLC, the device sends the password to the computer and waits for the correct input. Method: Open MultiCOMWatch and select Com1 (or the appropriate port connected to your PLC). Identify the PLC model and enter the corresponding string in the text box of the debugger. Note that STX is represented as 02 and ETX as 03. Here are some example strings based on different models: - FX2: \STX0700808\ETX → 02 30 37 30 30 38 30 38 03 36 41 32 - FX2N: \STX0300808\ETX → 02 30 33 30 30 38 30 38 03 36 36 32 - FX2_EPROM: \STX0800808\ETX → 02 30 38 30 30 38 30 38 03 36 42 - FXON/FXOX: \STX0800808\ETX → 02 30 38 30 30 38 30 38 03 36 42 - FX1N/FX1X: \STX0800808\ETX → 02 30 38 30 30 38 30 38 03 36 42 Sample Communication: Send: A2 07 00 FF 02 05 AE 00 08 C3 Receive: 0B 00 FF 02 00 AA 77 55 BB EF CD AB A4 00 → Password: ABCDEF Send: A2 07 00 FF 02 05 AE 00 08 C3 Receive: 0B 00 FF 02 00 AA 77 55 BB C1 B1 A1 A4 → Password: A1B1C1 Analysis: The password is found between "BB" and "A4" in the response. Read these characters from right to left in pairs. Once you understand the format, you can write a program in VB or other languages to read and write passwords. If you're interested in deeper communication details between the PLC and computer, consider using hardware monitoring methods to capture the entire process. 3. After sending the command, the received data will appear in the receiving window. If you don't see it clearly, convert the string to HEX format and resend it. Make sure to disconnect the PLC before sending any new commands.