Internal Error (SM560-S)

What does E2-18 mean?

The SM560-S Safety PLC has encountered an unspecified internal error. This indicates a system malfunction that prevents normal operation and requires intervention.

• Corrupted firmware or operating system of the SM560-S Safety PLC, leading to unexpected internal errors during operation or boot-up.
• Hardware defect within the CPU module (e.g., memory, processor, internal bus) of the SM560-S Safety PLC.
• Transient power supply issues (e.g., voltage sags below 21.6VDC, spikes above 26.4VDC) affecting the internal logic of the PLC.
• Overheating of the SM560-S CPU due to inadequate panel ventilation or consistently high ambient temperatures (verify internal temperature sensor readings if accessible).
• Critical application program error causing an unhandled exception or memory access violation within the PLC's operating system during runtime.

Click steps to track your progress.

1. 1

   1. Perform a power cycle of the SM560-S Safety PLC and observe if the internal error clears upon restart.

2. 2

   2. Connect to the Safety PLC via engineering software and examine the diagnostic buffer for any specific sub-codes or contextual information related to the internal error.

3. 3

   3. Re-download the boot project and the complete safety application to the SM560-S Safety PLC.

4. 4

   4. Verify the 24VDC power supply to the Safety PLC, ensuring it is stable and within the specified voltage range (e.g., 21.6VDC to 26.4VDC) using a multimeter.

5. 5

   5. Check the ambient temperature around the PLC panel and ensure proper ventilation; verify internal temperature sensor readings if accessible via software.

6. 6

   6. If the error persists after all software and power checks, replace the SM560-S Safety PLC CPU module.