All modules are equipped with 3 LED indicators.
 | In some models, these indicators are not led to the outside of the housing and are thus only visible when the module is opened. |
The green LED (POW LED) indicates the motor voltage status. If the LED is not on or only flickers faintly, check the motor supply voltage (24 -48 V DC).
The two other LEDs (green and red) indicate the status of the logical circuits:
| LED1 (green) | LED2 (red) | Interpretation |
| continuously on | continuously on | Module is in flash mode or no bus system active. |
| continuously on | flashing | New firmware is programming |
| briefly on, then off | briefly on, then off | Module booted. |
| on | off | Module is ready for operation and bus system is active. |
| flickering | off | Data is being exchanged. |
| off | off | No logic control voltage. If both LEDs were briefly on (booting phase), the connected bus system could not be initialized. Check bus cable. Is the master active? |
| off | on / flashing | An error occurred in the module. |
| off / on | on / off | Profibus is active, but not yet in "Data Exchange" mode, or automatic interface detection running. |
| flickering | flashing / flickering | Data is exchanged on the "main interface", while the diagnostic interface is active, so that data is also exchanged through this interface. |
| fast off / on | fast on / off | Firmware status undefined (should never occur). |