The Points Flick Alert is designed to fire when detection is lost on a set of points during the passage of a train.
(1547 points out of correspondence while CT track circuit occupied)
|Track Circuit TPR||The track circuit that runs over the set of points|
|Normal Detection NKR||The normal detection input channel|
|Reverse Detection RKR||The reverse detection input channel|
The alert will fire if either the NKR or RKR changes state whilst the TPR is in Dn state.