Procedure to Update FX5U-PLC CPU Firmware

This function is used when the user obtains the firmware update file from the Mitsubishi Electric FA website, and updates the module’s firmware using an SD memory card.

Note:

  • In system configurations where the CPU module (system) for which the firmware to be updated is connected to a network, etc., an error may occur when the firmware update is executed. Therefore, confirm the system’s safety before executing the firmware update.
  • Back up the various data such as the programs and parameters before executing the firmware update.

Firmware update method

Preliminary preparations
  • Download the firmware update information for the model to be updated from the Mitsubishi Electric FA website. The firmware update information is a ZIP file that contains the firmware update file and firmware update prohibited file.
  • Decompress the firmware update information (ZIP file).
  • Store the “$MELPRJ$” containing the firmware update file into the root folder of the SD memory card using a personal computer. When another “$MELPRJ$” is already stored in the SD memory card, delete the “$MELPRJ$” and then store the “$MELPRJ$” containing the firmware update file.
  • If updating of the firmware is prohibited, cancel the prohibit setting.

Restriction:

  • Store the “$MELPRJ$” folder into the SD memory card using a personal computer. The “$MELPRJ$” folder cannot be written into the SD memory card with the engineering tool.
  • Back up the various data such as the programs and parameters before executing the firmware update.

Operation

  1. Execute RUN→STOP and turn the CPU module power OFF, and insert the SD memory card into the CPU module.
  2. Turn the CPU module power ON and wait until the RUN LED and ERR LED blink.
  3. Confirm that the RUN LED and ERR LED blink slowly, and then restart or reset the CPU module.
  4. The RUN LED and ERR LED blink slowly. Wait until the LED turns off.
  5. Confirm that the RUN LED and ERR LED turns off, and then restart or reset the CPU module.
  6. The RUN LED and ERR LED blink slowly. Wait until the LED turns off. (5 seconds or more).
  7. After PWR LED turns on, check the engineering tool’s Module Diagnosis (CPU Diagnosis) screen, and confirm that the
    firmware version has been updated. [Diagnostics] … [Module Diagnostics(CPU Diagnostics)]
  8. Turn the CPU module power OFF and remove the SD memory card. Delete the firmware update file from the removed
    SD memory card.

Note:

  • Communication with other modules and communication with the engineering tool or external devices is not possible while the firmware update is being executed.
  • If a device comment file exists in the CPU module at the time of firmware update, the device comment file will be backed up to the SD memory card.
  • If the firmware is updated correctly and there is a device comment backup file in the SD memory card, the device comment file will be restored*2 from the SD memory card to the CPU built-in memory. After the file is restored, the device comment backup file in the SD memory card will be deleted.
  • If the CPU module is restarted or reset after recovery of the device comment file fails, recovery retry will be executed. The RUN LED and ERR LED blink slowly (5 seconds or more) when recovering the device comment file with retry. The LED will turn OFF when the file is correctly recovered. If the recovery fails again, the ERR LED will blink.
  • The firmware version can also be confirmed with the special register (SD8001).
  • After the firmware is updated, if a firmware update file that differs from the CPU module’s version is stored in the “$MELPRJ$” folder of the SD memory card, the firmware will be updated.

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