It does appear that the next rung the output is a trip state or healthy state, without knowing what they are trying to do with the logic, the N/C contacts etc. etc. it is only a guess.
1. assuming one of those inputs is true (as they are N/C) then the bit M3 will be off perhaps an interlock to stop some operation.
2. perhaps all need to be off so that M3 comes on to allow some type of operation.
As I said without finding out where else M3, M2, Y2F6 is used it is only a guess
If M3 is not used elsewhere then it dose appear to be some type of alarm condition (or healthy i.e. an enable).
Again it depends on what you call a trip value is it that the contacts should be on when healthy or off when healthy ?.
In many interlock systems for example all overloads have a N/O contact when healthy it is on, in this case you would use all in series as N/O so the bit M3 would be on when there is no overload.
Sometimes N/O auxiliary contacts on overloads may be used as interlocks in hard wired to disable the contactors, as most contactors have a N/O & N/C so rather than add an extra set of contacts they use the N/C that opens when healthy, (not a good idea as a broken wire means no overload) so it reports it as being ok even when tripped.