Safety PLC Checksum Error

What does E2-19 mean?

A data integrity check (checksum) has failed within the Safety PLC, indicating corrupted configuration or firmware. This critical error affects the reliability of the Safety PLC's operation, potentially leading to unsafe states.

• Corruption of the stored application program or configuration data in the Safety PLC's flash memory.
• Incomplete or interrupted firmware update leading to an inconsistent firmware image.
• Electromagnetic interference (EMI) causing bit flips in memory during data transfer or storage.
• Hardware defect in the Safety PLC's memory or checksum calculation unit.
• Unstable 24VDC power supply causing data corruption during memory writes or reads.

Click steps to track your progress.

1. 1

   1. Verify the consistency of the downloaded program by comparing the project checksum in the engineering software with the reported PLC checksum.

2. 2

   2. Re-download the safety application program to the PLC, ensuring a complete and successful transfer.

3. 3

   3. Inspect the 24VDC power supply for voltage fluctuations or ripple exceeding 5% (measured with an oscilloscope).

4. 4

   4. Check all grounding connections for the Safety PLC and its enclosure, ensuring a low impedance path to earth (e.g., <1 Ohm).

5. 5

   5. Perform a firmware update to the latest compatible version for the SM560-S module.

6. 6

   6. Replace the Safety PLC module if the checksum error persists after re-downloading the program and updating firmware.