Data log retention

Retaining or replacing data logs on an HMI device occurs during a:
  • Download.
     Adding a new data log or deleting a data log and then re-downloading a project to the HMI device retains the values of previously configured data logs. Re-downloading a project that has a data log with a configuration change such as name, size, and tags, retains only the values of previously unchanged configured data logs. Downloading a project to an HMI device that has an SD card with data logs from a different project replaces the data logs.
  • Firmware change.
     Data logs remain unchanged when firmware on the HMI device is updated with a ControlFLASH. Data logging does not occur during a ControlFLASH. Downloading the same project to the HMI device after updating the firmware leaves the data log on the HMI device unchanged. When the project runs, data logging starts again.
  • HMI reboot.
     Data logging stops when rebooting the HMI device. The data log remains unchanged. Data logging starts after the reboot completes.
  • HMI recovery.
    If a project has a data log and the HMI device runs out of memory or has a fatal error, there are two options:
    • Restore Defaults.
       The HMI device opens the default project. Data logging stops when the HMI device is in error or when the default project is running. The data log on the SD card from the previous project on the HMI device remains unchanged. Data logging starts when downloading a project that contains a data log to the HMI device.
    • Continue.
       The HMI device recovers and the previous project opens. Data logging starts.
  • SD card change.
     Data logging stops when removing the SD card from the HMI device. Data logging starts when inserting any SD card. The SD card can be from the same project, a different project, the same HMI device, or a different HMI device. The SD card may contain the same or different data logs. The result of inserting an SD card in the HMI device depends on the data log on that SD card:
    • Same data log.
       When inserting an SD card that contains a data log from the current project on the HMI device, data logging starts. New data appends to the existing data log.
    • Different data log.
      Inserting an SD card that contains a different data log replaces the data log on the SD card with the data log in the project currently running on the HMI device.
    • No data log.
       Inserting an SD card that has no data log into an HMI device that has a project with a data log creates a data log on the SD card.
      TIP:
      Tips:
      • If no SD card exists on the HMI device, rebooting the HMI device or downloading a project stops data logging. Data logging starts when inserting an SD card.
      • Any time it is necessary to remove the SD card, ensure that the files do not become corrupt. On the
        Settings
        screen on the HMI device, open the
        Data Log
         popup and select Safely Remove icon
        Safely Remove SD Card
        .
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