Internal Terminal Error (μC1)

What does Diag3:lit, Diag4:flashing mean?

This LED combination (Diag 3 lit, Diag 4 flashing) indicates an internal error related to microcontroller 1 (μC1) of the terminal. This is a global fault, leading to the shutdown of the terminal. Such errors typically necessitate inspection by the manufacturer.

• An internal error or fault has occurred within the first microcontroller (μC1) of the terminal.
• Corruption of internal memory or firmware in μC1.
• Hardware failure affecting the primary processing unit.

Click steps to track your progress.

1. 1

   Record the exact LED states (Diag 3 lit, Diag 4 flashing) for documentation.

2. 2

   Power cycle the EL6900 terminal and observe if the fault clears or reoccurs immediately upon restart.

3. 3

   Access the TwinCAT System Manager to check for any additional diagnostic messages or system events logged by the EL6900 prior to the shutdown.