How to make the Siemens MP377 touch screen suddenly power off and save historical data? -Solutions - Huaqiang Electronic Network

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The project utilizes the Siemens MP377 touch screen and includes a USB flash drive for storing historical data, allowing users to view historical trends on the display. However, if there is an unexpected power failure before the data is fully saved by pressing the exit button, the data might be lost or corrupted.

Some customers have mentioned that other devices can perform this function effectively. Is it possible for the MP377 to save data periodically?

A: Your question is accurate. It's similar to editing an Excel file on a computer. If the computer suddenly loses power while you're editing, the file may not save properly, leading to data loss. Here are some recommendations:

1. Implement a dedicated "Exit" button to close the system gracefully, which ensures data integrity under normal conditions. However, this won't help in the case of a sudden power outage.

2. In the MP377 control panel, under "OP," there is a checkbox labeled “Automatically repair filesystem errors on storage cards at system startup and card insertion time.” Enabling this option could improve reliability.

3. Some international projects use a power-off delay device. When the main power is cut, the PLC sends a signal to the touch screen, prompting it to execute the STOPRUNTIME function immediately. This allows the system to shut down safely after a short delay, preventing data corruption during a power outage.

4. WinCC Flexible has a system function called ArchiveLogFile, which can back up log files. To use it, you need to first stop logging and close all logs. You can check the “Record” section in the help documentation for more details. You can also trigger this function when specific system events occur.

5. The most reliable solution is to add an Uninterruptible Power Supply (UPS). This ensures continuous power during outages, protecting your data from being lost due to sudden shutdowns.