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Installation

Download
  • Pre-built executables can be downloaded here.
Build executable from source
  • Download the build script: [windows] [linux].
  • Save and run the script on a dedicated folder.
  • The resulting binary can be found under the dist directory.
Run from source
  • Download the script: [windows] [linux].
  • Save and run the batch file in a dedicated folder.

STM32 boards or FX3U PLC's Usage

Enable DFU mode on PLC

  • Disconnect PLC power
  • Figure out where BOOT0 and Vcc pins are located.
  • Set the RUN switch to STOP position.
  • Briefly short BOOT0 and Vcc pins while applying power to the PLC to enable DFU.

Install Bootloader

  • Connect PLC serial port to PC.
  • Start openplc-uploader.
  • Select the correct board.
  • Select the correct serial port
  • Click on Install Bootloader
  • Click Upload button to start installing the bootloader.
  • If the upload is succesful, the RUN led will blink rapidly to indicate it is in bootloader mode.

Normal Usage

  • Select the generated openplc code using the Browse button.
  • Select the correct board.
  • Select the correct serial port.
  • Set the PLC RUN switch to STOP position.
  • Click Upload button to start uploading.
  • Set the PLC RUN switch to RUN to start the PLC.

FX3U PLC Clone troubleshooting

Upload of bootloader does not work initially

  • Likely the flash memory is locked-out by the PLC vendor.
  • To unlock the memory:
    • Download and install STM32CubeProg
    • Follow the steps in Enable DFU mode on PLC to enable the bootloader
    • Run the unprotect sequence (example uses Windows and COM8 serial port):
      • "C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin\STM32_Programmer_CLI.exe" -c port=COM8 br=57600 -rdu
      • NOTE: The -rdu command at the end is the command to remove read-out protection
    • The unprotect sequence will likely show error messages. However, as long as Activating device: OK is seen, and multiple retry attempts are shown in the log, the sequence will have likely worked. You can tell by the fact that the next steps (and eventually, the bootloader upload) will now succeed.
    • Follow again the steps in Enable DFU mode on PLC to enable the bootloader
    • Perform a mass-erase of the MCU (example uses Windows and COM8 serial port):
      • "C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin\STM32_Programmer_CLI.exe" -c port=COM8 br=57600 -e all
      • NOTE: The -e all command at the end is the command to mass-erase the entire MCU.
  • Now you can start over at the beginning of the sequence: Enable DFU mode on PLC, then Install Bootloader.