Diagnostic LEDs

| LED | Color | Meaning | |
|---|---|---|---|
| Run | green | This LED indicates the terminal's operating state. | |
| off | State of the EtherCAT State Machine: INIT = terminal initialization | ||
| flashing | State of the EtherCAT State Machine: PREOP = function of mailbox communication and variant standard settings | ||
| single flash | State of the EtherCAT State Machine: SAFEOP = verification of the sync manager channels and the distributed clocks. | ||
| on | State of the EtherCAT State Machine: OP = normal operating state; mailbox-and process data communication is possible | ||
| flickering | State of the EtherCAT State Machine: BOOTSTRAP = function for terminal firmware updates | ||
| Power | green | off | Error in internal communication to the field side (e.g. due to missing supply voltage) | 
| on | Internal communication OK | ||
| Enable A/B | green | off | Energization is disabled or EL2212 is not ready for operation. | 
| on | Energization is enabled or EL2212 is ready for operation. | ||
| Warning A/B | yellow | off | no defect | 
| on | Operating warning, e.g.: - Supply voltage is outside the configured range | ||
| Error A/B | red | off | no defect | 
| on | Configuration error, e.g.: - no supply voltage connected | ||