56 •
Fieldbus coupler/controller
Fieldbus coupler 750-319
L
ON
W
ORKS
®
3.1.7.3 Node status
LED
Color
Meaning
IO red
/green
/ orange
The 'I/O' LED indicates the node operation and signals faults occur-
ring.
The coupler starts after switching on the supply voltage. The "I/O" LED
flashes red. Following an error free start up the "I/O" LED changes to green
steady light.
In the case of a fault the "I/O" LED continues blinking red. The fault is cycli-
cally displayed with the blink code.
Fig. 3-7: Signalling the LED's node status
g012111e
After overcoming a fault, restart the coupler by cycling the power.
I/O-LED
Meaning
Trouble shooting
green
Data cycle on the internal bus
off
No data cycle on the internal bus
red
Coupler hardware defective
Change the coupler
red
blinks
a) When starting: internal bus is initialized
b) During operation: general internal bus fault
Evaluate the fault signal (fault code
and fault argument)
red
blinks cyclically
Fault message during internal bus reset and
internal fault.
Evaluate the fault signal (fault code
and fault argument)