I/O Terminal /
ERROR HANDLING AND DIAGNOSIS
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8
ERROR HANDLING AND DIAGNOSIS
The Bus Coupler has two groups of LEDs for the display of status. The upper group or left
hand group indicates the state of the fieldbus.
On the upper right hand side of the 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 Standard-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.
8.1 Fieldbus
LEDs
The upper three LEDs (or the two LEDs on the left) indicate the operating state of the
PROFIBUS communication:
Figure 5.1:
PROFIBUS Coupler Diagnostic LEDs
