Supply Voltage Status; Fault Behavior; Fieldbus Failure; Internal Bus Fault - WAGO LONWORKS 750-319 Manual

58 • Fieldbus coupler/controller
Fieldbus coupler 750-319
Example: the 13
1.
2.
3.

3.1.7.5 Supply voltage status

There are two green LEDs in the coupler supply section to display the supply
voltage. The left LED (A) indicates the 24 V supply for the coupler. The right
hand LED (C) signals the supply to the field side, i.e. the power jumper con-
tacts.
LED
A
C

3.1.8 Fault behavior

3.1.8.1 Fieldbus failure

A fieldbus failure is given i. e. when the network manager (PC with Network
Management Tool Software) cuts-out or the bus cable is interrupted. A fault in
the network manager can also lead to a fieldbus failure.
For the LON fieldbus coupler the fault code and the fault argument are trans-
fered by network variables or explicite messages.

3.1.8.2 Internal bus fault

An internal bus fault is created, for example, if an I/O module is removed. If
this fault occurs during operation, the output modules behave in the same
manner as an I/O module stop.
The "I/O" LED blinks red.
The coupler generates a fault message (fault code and fault argument).
Once the internal bus fault is fixed, the controller starts up following power
being cycled as during a normal start-up. The transfer of the process data is
then resumed and the node outputs are correspondingly set.
th
I/O module is removed.
The "I/O" LED generates a fault display with the first blink sequence (approx. 10 Hz).
The first pause is followed by the second blink sequence (approx. 1 Hz). The "I/O"
LED blinks four times and thus signals the fault code 4 (internal bus data fault).
The third blink sequence follows the second pause. The "I/O" LED blinks twelve
times. The fault argument 12 means that the internal bus is interrupted after the 12th
I/O module.
Color Meaning
green Status of the operating voltage – system
green Status of the operating voltage – power jumper contacts
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