Memory Error

What does 80F1 mean?

A memory error has occurred in the CPU Unit, or a checksum error has been detected during the PLC's cyclic checksum verification. This is a fatal error, indicated by flag A401.15. The specific memory area affected is detailed by individual bits in Auxiliary Area A403. The CPU Unit attempts automatic recovery from flash memory for certain areas like user program memory and PLC Setup; if unsuccessful, operation stops.

• Checksum error in the user program memory (A403.00 ON).
• Checksum error in the PLC Setup (A403.04 ON).
• Checksum error in the registered I/O table (A403.05 ON).
• Checksum error in the routing tables (A403.07 ON).
• Checksum error in the CPU Bus Unit setup (A403.08 ON).
• Illegal rewriting detected in a specific area of memory.

Click steps to track your progress.

1. 1

   If A403.00 is ON, transfer the user program to the CPU Unit again (e.g., using CX-Programmer or Memory Card automatic transfer function).

2. 2

   If A403.04 is ON, transfer the PLC Setup to the CPU Unit again.

3. 3

   If A403.05 is ON, transfer the I/O tables to the CPU Unit again.

4. 4

   If A403.07 is ON, transfer the routing tables to the CPU Unit again.

5. 5

   If A403.08 is ON, transfer the CPU Bus Unit setup to the CPU Unit again.

6. 6

   If these measures do not resolve the issue, consider replacing the CPU Unit as a hardware failure is highly probable.