I agree the LED point will be 12V or 0V. The circuit needs to differentiate between limit switch and travelling. Unfortunately I don't see that in this circuit, yet. ....
This would be impossible without some manner of additional testing/proofing that the slider, itself, is actually moving.
Are you saying that a
positive indication (that either the FWD
or REV limit switch had transitioned), within a specified period of time, is
insufficient as proof of a successful slider event?
As it stands, the circuit above
only transitions when one or the other limit switches is hit. Should that not happen, (again, within a fixed time frame) an error in slider movement (or some electrical/motor error) would be a reasonable assumption of a fault that then could be used to initiate some manner of process shutdown.
<EDIT> I am assuming the limit switches are spring loaded types, i.e., they have a
normal NO-NC arrangement that, when pressed, transitions to NC-NO, to then transition back to NO-NC when released. Is that correct?