CPU Unable to Read Parameter Value

What does E11-19 mean?

The CPU encountered an error while attempting to read the value of at least one parameter. This can signify data corruption, an inaccessible memory location, or a configuration issue, affecting the CPU's ability to operate as intended and potentially leading to incorrect processing or system failures.

• Corrupted firmware or application memory block on the CPU board.
• Parameter data integrity error within the non-volatile memory (EEPROM or Flash).
• Incorrect parameter index or data type requested by application logic (e.g., reading an INT as a REAL).
• Transient memory access error due to power supply instability (e.g., 24VDC ripple).
• Hardware fault in the CPU's memory management unit or data bus.

Click steps to track your progress.

1. 1

   1. Verify the CPU's internal 24VDC and 5VDC supply voltages at specified test points (e.g., TP1, TP2) using a multimeter.

2. 2

   2. Attempt to read the specific parameter (e.g., P1-01) using a diagnostic tool or HMI to confirm accessibility.

3. 3

   3. Perform a factory reset of the CPU parameters (e.g., using the 'Reset All Parameters' function in engineering software).

4. 4

   4. Re-flash the CPU firmware to ensure integrity of the operating system.

5. 5

   5. Load a known good application program to the CPU.