I/O Module Checksum Error

What does E3-19 mean?

A data integrity check (checksum) has failed within the I/O module, indicating corrupted configuration or firmware. This critical error affects both non-safety and safety I/O. For safety I/O, it means the safety configuration (CRCs for I- and F-Parameters) is compromised.

• Corrupted firmware or configuration data stored on the I/O module's internal memory due to power disturbance, electromagnetic interference (EMI), or an interrupted download.
• Defective internal memory (e.g., EEPROM, flash) on the I/O module, preventing correct data storage or retrieval for checksum verification.
• During a firmware update or configuration download, the data transfer was interrupted or corrupted, leading to an invalid checksum being calculated.
• Excessive vibration, mechanical shock, or thermal stress causing intermittent hardware failures on the I/O module's printed circuit board (PCB), affecting data integrity.
• Incorrect GSDML file used for the I/O module, causing the safety PLC to write or expect data in a format that leads to a checksum mismatch.

Click steps to track your progress.

1. 1

   1. Perform a power cycle of the I/O module and observe if the checksum error clears; if not, proceed to re-download configuration.

2. 2

   2. Connect to the Safety PLC via engineering software and perform a complete re-download of the safety configuration and associated firmware (if applicable) to the affected I/O module.

3. 3

   3. Verify the module's power supply (e.g., 24VDC) at the input terminals for stability and correct voltage level using a calibrated multimeter (e.g., 24VDC +/-10%).

4. 4

   4. Remove and carefully re-seat the I/O module in its backplane or rack to ensure proper electrical contact and secure connection.

5. 5

   5. If the checksum error persists after attempting re-downloads and verifying power, replace the I/O module with a new unit and repeat the configuration download.