24 •
Status Indicators
Fieldbus Dependent I/O Module
PROFIBUS DP
6.4 Overload Status Indicator
The LED designated “OVERLOAD”, when illuminated, indicates the pres-
ence of an output fault.
Possible output faults:
•
Short circuit of one or more outputs
•
Missing supply voltage to the output drivers
•
Fault of an output driver
•
Feedback
A fault is detected if a transmitted value of “1” by the master controller does
not produce a threshold voltage at a corresponding output.
When an output fault is detected, the electronic module transmits a periphery
fault signal to the fieldbus controller board. The I/O module switches the LED
off again once the fault has been corrected, and after a 1 second delay, cancels
the periphery fault message.
