I recently faced a challenge while working with the PLC TM172PBG28R using EcoStructure Machine Expert - HVAC. My goal was to accurately track and store running hours and minutes in the EEPROM. However, I encountered an issue where a power flicker caused the stored data to reset to zero. This was frustrating as it disrupted my system’s reliability.
After some research and experimentation, I discovered that the problem stemmed from the EEPROM’s sensitivity to power fluctuations. To resolve this, I restructured my program to include data redundancy. By storing the runtime data in multiple locations within the EEPROM, I ensured that even if one section got corrupted, the others would remain intact. Additionally, I implemented a checksum verification mechanism to detect and correct errors during data retrieval.
Here’s a brief overview of the steps I took:
- Data Redundancy: Stored runtime data in three separate EEPROM sections.
- Checksum Verification: Added a checksum for each data block to detect corruption.
- Error Handling: Included a routine to recover data from the least corrupted block if an error was detected.
This solution has been incredibly effective. Since implementing these changes, I haven’t experienced any data loss during power fluctuations. It’s a relief to know that my system is now more robust and reliable.
If anyone else is dealing with similar issues, I highly recommend exploring data redundancy and checksum methods. They might seem a bit involved at first, but the peace of mind they provide is well worth the effort!
Feel free to reach out if you have questions or need further clarification. Happy coding! 