The project utilizes the Siemens MP377 touch screen and includes a USB flash drive for saving historical data, which is then displayed as historical trends on the screen. However, if there's a sudden power failure before the user presses the exit button, the data may become corrupted or incomplete. Some customers have mentioned that other devices can handle this scenario effectively. Is the MP377 capable of automatically saving data at regular intervals?
A: You're absolutely right. It’s similar to editing an Excel file on a computer—if the system suddenly loses power while you're working, the file might not save properly. Here are some recommendations:
1. Implement a dedicated "Exit" button to properly shut down the system and ensure data integrity. However, this won't help in the case of an unexpected power cut.
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 foreign projects use a power-off delay device. When the main power is disconnected, the PLC sends a signal to the touch screen, which triggers the STOPRUNTIME function. This allows the system to complete any pending operations before shutting down, ensuring a controlled power loss.
4. WinCC Flexible has a built-in 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 help documentation under the "Record" section for more details. You can also trigger this function when a specific system event occurs.
5. The most reliable solution is to install an Uninterruptible Power Supply (UPS). This ensures continuous power during outages, preventing data loss and system crashes.
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