BECKHOFF BK3xx0 - Manual (Page 62)

Notes on the Documentation
60 Fieldbus Components
6. Diagnosis and Error Handling
LEDs
Overview
The Bus Coupler has two groups of LEDs for the display of status. The upper group (BK3xx0) or left hand group
(LC3100) indicates the state of the fieldbus.
On the upper right hand side of the BK3xx0 Bus Coupler are two more green LEDs that indicate the supply voltage.
The left hand LED indicates the presence of the 24 V supply for the Bus Coupler. The right hand LED indicates the
presence of the supply to the power contacts. The two K-Bus LEDs (I/O RUN, I/O ERR) are located under the
fieldbus LEDs. These indicate the operational state of the Bus Terminals and the connection to these Bus Terminals.
Fieldbus LEDs
The upper three LEDs (or the two LEDs on the left) indicate the operating state of the PROFIBUS communication: