Fieldbus coupler/controller
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Modular I/O System
L
ON
W
ORKS
®
1 Illegal
Opcode
2 Stack
overflow
3 Stack
underflow
4 NMI
* The number of blink pulses (n) indicates the position of the I/O module. I/O modules
without data are not counted (i.e. supply module without diagnosis)
Example: the 13
th
I/O module is removed.
1.
The "I/O" LED generates a fault display with the first blink sequence (approx. 10 Hz).
2.
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).
3.
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.
3.2.9.5 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
Color
Meaning
A
green
Status of the operating voltage – system
C
green
Status of the operating voltage – power jumper contacts
3.2.10 Fault behavior
3.2.10.1 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 controller the fault code and the fault argument are
transfered by network variables or explicite messages.
3.2.10.2 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 controller generates a fault message (fault code and fault argument).