WAGO -I/O-SYSTEM 750 Technical Description page 68

68 • Fieldbus Coupler 750-337, 750-338
LED Display
I/O
green
off
red
red
blinks
red
blinks cyclically
Fault Message of the 'I/O' LED
1 st blink sequence: Starting the fault display
2 nd blink sequence: Fault code
3 rd blink sequence: Fault argument
Fault code 1: "Hardware and Configuration fault"
Fault argument
Meaning
Data cycle on the internal bus
No data cycle on the internal bus
Coupler hardware defective
When starting: internal bus is initialized
During operation: general internal bus fault
Fault message during internal bus reset and internal fault:
The fault message is diplayed via the 'I/O ERR'-LED with the aid of a
blink code and evaluated as fault code and fault argument.
Fault description
- Checksum error of the parameter
data
1 Overflow of the internal buffer
memory for the inline code
2 I/O module(s) with unsupported
data type
Trouble shooting
Turn off the power supply of the
node, reduce number of I/O mod-
ules and turn the power supply on
again.
Turn off the power supply of the
node, reduce number of I/O mod-
ules and turn the power supply on
again. If the error still exists, ex-
change the bus coupler.
Detect faulty I/O module as fol-
lows: turn off the power supply.
Place the end module in the middle
of the fieldbus node. Turn the
power supply on again.
– If the LED is still blinking, turn
off the power supply and place the
end module in the middle of the
first half of the node (towards the
coupler).
– If the LED doesn't blink, turn off
the power supply and place the end
module in the middle of the second
half of the node (away from the
coupler).
Turn the power supply on again.
Repeat this procedure until the
faulty I/O module is detected.
Replace the faulty I/O module.
Ask about a firmware update for
the fieldbus coupler.
WAGO-I/O-SYSTEM 750
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