First fault detection

I have 14 bits, each is set when a particular fault occurs, the problem is once 1 fault occurs and the machine stops it then causes more "red herring" faults.

I need to detect which fault happened first and report this as the reason the machine stopped.

I can do it the long way:-

A M100.0

AN M100.1

AN M100.2

etc...

but this would result in 14 very similar networks, and what if my fault list grows to say 100?

Is there a quicker/more efficient way of detecting which bit was set first?