Boot Project Load Failed (Retain Data)

What does E3-44 mean?

The CPU failed to load the boot project because of an issue with loading retain data. This indicates that critical persistent data, necessary for the project's operation, could not be retrieved, potentially leading to an incomplete or incorrect system startup. This can cause the PLC to run with default or corrupted settings.

• Corrupted retain data image on the CPU's non-volatile memory (e.g., flash, EEPROM) due to power loss during write operations.
• Memory block corruption within the CPU's dedicated retain memory area preventing data retrieval.
• Firmware bug causing incorrect access or write operations to the retain data storage region.
• Physical degradation or failure of the CPU's non-volatile memory chip storing retain data.
• Incorrect project download process failing to properly initialize or validate the retain data block.

Click steps to track your progress.

1. 1

   1. Power cycle the CPU by turning off power, waiting 30 seconds, then restoring power.

2. 2

   2. Connect to the CPU with programming software. Perform a full project download, ensuring the 'Initialize Retain Data' or 'Clear Retain Memory' option is selected.

3. 3

   3. Verify the CPU's firmware version. If an update is available that addresses memory stability, perform the firmware update.

4. 4

   4. Check the CPU diagnostic logs for specific memory access errors or non-volatile memory warnings.

5. 5

   5. If accessible, back up any current project data, then perform a factory reset of the CPU via the programming software, followed by a complete project download.