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 REDUNDANT SYSTEM 
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This model shows a naive implementation of a fault detection 
and isolation software that applies to three identical sensors 
measuring the same input data. A significant random error is 
added to each sensor and a two-by-two comparison is performed 
to detect the faultly sensor(s).

While running the simulation, open the control board by clicking 
on the icon of the process (sw). Insert an integer value in 
the "data_in" box and the output data boxes will give the 
result of the fault detection:
- "status" equals 0 when the three sensors give the same
value; equals -1 when the three sensors give three different 
values; otherwise, it gives the number of the erroneous sensor.
- "data_out" gives either the measured value or "error" in 
case the three sensors don't agree.

Note that the isolation part has not been fully implemented yet.